pc130-7

00-1

MACHINE MODEL SERIAL NUMBER

PC130-7 70001 and up

• This shop manual may contain attachiments and optional equipment that are not available in yourarea. Please consult your local Komatsu distributor for those items you may require.Materials and specifications are subject to change without notice.

• PC130-7 mounts the SAA4D95LE-3 engine.For details of the engine, see the 95-3 Series Engine Shop Manual.

SEBM036300

© 2004All Rights ReservedPrinted in Japan 03-04(02)

00-2 PC130-7

CONTENTS

No. of page01 GENERAL ................................................................................................................01-1

10 STRUCTURE AND FUNCTION .................................................................10-1

20 TESTING AND ADJUSTING .......................................... To be issued next time

30 DISASSEMBLY AND ASSEMBLY ............................. To be issued next time

40 MAINTENANCE STANDARD......................................................................40-1

90 OTHERS ....................................................................................................................90-1

PC130-7 01-1

GENERAL ASSEMBLY DRAWING ........................................... 01-2SPECIFICATIONS ..................................................................... 01-4WEIGHT TABLE ........................................................................ 01-7LIST OF LUBRICANTS AND WATER ....................................... 01-9

01 GENERAL

01-2 PC130-7

GENERAL

GENERAL ASSEMBLY DRAWING

SPECIFICATION DIMENSIONAL DRAWING

Item UnitPC130-7

2.5 m arm, 500 mm shoe 3.0 m arm, 700 mm shoe

A Overall length mm 7,595 7,485

B Overall height mm 2,810 3,170

C Overall width mm 2,490 2,490

D Shoe width mm 500 700

E Cab height mm 2,810 2,810

F Trail swing radius mm 2,190 2,190

G Crawler overall length mm 3,610 3,610

H Distance between tambler center mm 2,880 2,880


PC130-7 01-3

GENERAL

WORKING RANGE DRAWING

Working range (mm)PC130-7

2.5 m arm 3.0 m arm

A Maximum digging radius 8,290 8,785

B Maximum digging depth 5,520 6,015

C Maximum digging height 8,610 8,790

D Maximum vertical wall digging depth 4,940 5,360

E Maximum dumping height 6,170 6,535

F Minimum swing radius of work equipment 2,450 2,610

G Maximum reach at ground level 8,170 8,665


01-4 PC130-7

GENERAL

SPECIFICATIONS

Machine model PC130-7


Serial No. 70001 and up

Bucket capacity (SAE) m3 0.5 0.5

Operating weight kg 12,200 13,050

Per

form

ance W

orki

ng r

ange

s

Max. digging depth mm 5,520 6,015

Max. vertical wall depth mm 4,940 5,360

Max. digging reach mm 8,290 8,785

Max. reach st ground level mm 8,170 8,665

Max. digging height mm 8,610 8,970

Max. dumping height mm 6,170 6,535

Max. digging force (bucket) kN {kg} 93.2 {9,500} 93.2 {9,500}

Swing speed rpm 11.0 11.0

Swing max. slope angle deg. 2.0 2.0

Travel speed (Hi/Lo) km/h 2.7/5.5 2.7/5.5

Gradeability deg. 35 35

Ground pressure kPa {kg/cm2} 38 {0.39} 29 {0.30}

Dim

ensi

on

Overall length (for transport) mm 7,595 7,485

Overall width mm 2,490 2,490

Overall height (for transport) mm 2,810 3,170

Overall height to top of cab mm 2,730 2,730

Ground clearance of counterweight mm 855 855

Min. ground clearance mm 400 400

Tail swing radius mm 2,190 2,190

Min. swing radius of work euipment mm 2,450 2,450

Height of work equipment at min. swing radius mm 6,455 6,455

Length of track on ground mm 3,610 3,610

Distance between tumbler center mm 3,880 3,880

Track gauge mm 1,990 1,990

Overall height of machine cab mm 1,885 1,885

Eng

ine

Model SAA4D95LE-3

Type 4-cycle, water-cooled, in-line, vertical, direct injection, with turbochatger, after cooler

No. of cylinders-bore x stroke mm 4 – 95 x 115

Piston displacement l {cc} 3.260 {3,260}

Per

form

ance

Rated horsepower kW/rpm{HP/rpm} 66.2/2,200 {88.7/2,200}

Max. torpue Nm/rpm{kgm/rpm} 353/1,500 {36.0/1,500}

High idling speed rpm 2,400

Low idling speed rpm 1,100

Min. fuel consumption ratio g/kWh{g/HPh} 224 {165}

SPECIFICATIONS

PC130-7 01-5

GENERAL




Eng

ine

Starting motor 24V, 3.0 kw

Alternator 24V, 25A

Battery 12V, 64 Ah x 2

Radiator type Aluminum wave (4-line)

Und

erca

rria

ge

Carrier roller 1 on each side

Track roller 7 on each side

Track shoe (iron shoe) Asembly-type triple grouster, 43 on each side

(road liner) Road liner, 43 on each side

Hyd

raul

ic s

yste

m

Hyd

raul

ic p

ump Type x no. Variable displacement piston type x 1

Discharge l /min 226 (at 2,200rpm)

Set pressure (at operation) MPa {kg/cm2} 31.9 {325}

(at traveling) 34.8 {355}

Con

trol

valv

e Type x no. 7-spool type x 1

Control method Hydraulic type

Hydr

aulic

mot

or

Travel motor Variable displacement piston type(with brake valve, holding brake) x 2

Swing motor Fixed displacement piston type(with safety valve, holding brake) x 1

Hydraulic tank Box-shaped, open

Hydraulic filter Tank return side

Hydraulic cooler Air cooled

Wor

k eq

uipm

ent c

ylin

der

Boo

m c

ylin

der

Type Reciprocating piston tipe Reciprocating piston tipe

Cylinder inner diameter mm 105 105

Piston rod diameter mm 70 70

Stroke mm 990 990

Max. length betwiin pins mm 2,490 2,490

Min. length betwiin pins mm 1,500 1,500

Arm

cyl

inde

r




Stroke mm 1,175 1,175



SPECIFICATIONS

01-6 PC130-7

GENERAL




Hyd

raul

ic s

yste

m

Wor

k eq

uipm

ent c

ylin

der

Buc

ket

cylin

der




Stroke mm 885 885



SPECIFICATIONS

PC130-7 01-7

GENERAL

WEIGHT TABLE

k This weight table is a guide for use when transporting or handling component.Unit: kg



Engine assembly (excl. water, oil) 449

• Engine (excl. water, oil) 345

• Engine mount 19.6

• PTO 4.1

• Hydraulic pump 80

Radiator, oil cooler assembly 83

Revolving frame 1,110

Operator's cab 279

Operator's seat 35

Fuel tank (excl. fuel) 101

Hydraulic tank (excl. hydraulic oil) 89

Control valve 116

Self pressure reducing valve 4.8

Counterweight 2,455

Swing motor (with brake valve) 26

Swing circle 155

Swing machinery 72.2

Center swivel joint 28.6

Track frame assembly 2,260

• Track frame 1,280

• Idler assembly 79 x 2

• Recoil spring assembly 69.5 x 2

• Carrier roller 16.5 x 2

• Track roller 21 x 14

• Travel motor, final drive assembly 144 x 2

• Sprocket 33.7 x 2

Track shoe assembly

• Triple grouser shoe (500mm) 725 x 2



• City pad shoe (500mm) 720 x 2

• Road liner (500mm) 780 x 2

WEIGHT TABLE

01-8 PC130-7

GENERAL

Unit: kg



Boom assembly 1,088

Arm assembly 392.4

Bucket link assembly 92.7

Bucket assembly 369

Boom cylinder assembly 92.7

Arm cylinder assembly 135

Bucket cylinder assembly 82.6

WEIGHT TABLE

PC130-7 01-9

GENERAL

LIST OF LUBRICANTS AND WATER

-22 -4 14 32 50 68 86 104°F

-30 -20 -10 0 10 20 30 40°C

RESERVOIR

Engine oil pan

PTO case

Swing machinery case

Final drive case (each)

Hydraulic system

Idler (each)

Hydraulic oil

Diesel fuel

Add antifreezeCooling system

Fuel tank

Coolant

Carrier roller (each)

Track roller (each)

Engine oil

17.5 16

0.75 0.75

2.5 2.5

2.5

140 90

240

18.2

2.5

0.090 ---0.105

0.090 ---0.105

0.075 ---0.085

0.075 ---0.085

0.068 ---0.076

0.068 ---0.076

KIND OF FLUID

AMBIENT TEMPERATURE CAPACITY ( )

SAE 30

SAE 10W

SAE 10W-30

SAE 15W-40

SAE 30

SAE 30

SAE 10W

SAE 10W-30

HD46-HM (a)

ASTM D975 No.2

SAE 15W-40

ASTM D975 No. 1

Specified Refill

LIST OF LUBRICANTS AND WATER

PC130-7 10-1

PTO ...........................................................................10- 2COOLING SYSTEM ..................................................10- 3POWER TRAIN .........................................................10- 5SWING CIRCLE ........................................................10- 6SWING MACHINERY................................................10- 7TRACK FRAME.........................................................10- 8IDLER CUSHION ......................................................10- 9HYDRAULIC COMPONENT LAYOUT ......................10- 10VALVE CONTROL.....................................................10- 12HYDRAULIC TANK AND FILTER..............................10- 14HYDRAULIC PUMP (PISTON PUMP) ......................10- 15CONTROL VALVE.....................................................10- 36SUCTION SAFETY VALVE .......................................10- 46CLSS .........................................................................10- 47SELF PRESSURE REDUCING VALVE ....................10- 79CENTER SWIVEL JOINT..........................................10- 86TRAVEL MOTOR (FINAL DRIVE).............................10- 87SWING MOTOR ........................................................10- 96SOLENOID VALVE....................................................10-102PPC ACCUMULATOR...............................................10-104PPC VALVE ...............................................................10-105WORK EQUIPMENT.................................................10-116AIR CONDITIONER PIPING .....................................10-117ENGINE CONTROL ..................................................10-118ELECTRIC CONTROL SYSTEM ..............................10-123MONITOR SYSTEM..................................................10-150

10 STRUCTURE AND FUNCTION

10-2 PC130-7

STRUCTURE AND FUNCTION

PTO

1. Coupling2. Shaft3. Cage4. Hydraulic pump

5. Level plug6. Oil filler plug7. Breather

PTO

PC130-7 10-3


COOLING SYSTEM

COOLING SYSTEM

10-4 PC130-7


1. Reservoir tank 2. Shroud 3. Oil cooler 4. Fan 5. Radiator 6. Fan guard 7. Oil cooler 8. Radiator cap

9. Charge air inlet hose10. Radiator inlet hose11. Charge air outlet hose12. Oil cooler outlet13. Drain valve14. Radiator outlet hose15. Air condenser16. Oil cooler inlet

SPECIFICATION

Radiator Oil cooler Charge air cooler

Core type Aluminum wave(4-line) CF40 Aluminum wave

Fin pitch (mm) 3.5/2 3.5/2 4.0/2

Total heat dissipation surfase (m2) 25.58 11.60 9.54

Pressure valve cracking pressure(kPa {kg/cm2})

49.0 ± 14.7{0.5 ± 0.15} — —

Vacuum valve cracking pressure(kPa {kg/cm2})

-4.9 – 0{-0.05 – 0} — —

COOLING SYSTEM

PC130-7 10-5


POWER TRAIN

1. Idler 2. Control valve 3. Self pressure reducing valve 4. Travel motor 5. Hydraulic pump 6. Engine 7. 2-stage relief solenoid valve

8. Swing hold brake solenoid valve 9. 2-speed travel changeover solenoid valve10. PPC lock solenoid valve11. Swing motor12. Center swivel joint13. Swing machinery14. Swing circle

POWER TRAIN

10-6 PC130-7


SWING CIRCLE

1. Outer race2. Ball3. Inner race

a. Inner race soft zone "S" positionb. Outer race soft zone "S" position

SPECIFICATIONS

Reduction ratio: – = – 8.182

Amount of grease: 6.5 l (Grease: G2-LI)

9011

SWING CIRCLE

PC130-7 10-7


SWING MACHINERY

1. Swing pinion (No. of teeth: 11) 2. Case 3. No. 2 sun gear (No. of teeth: 17) 4. No. 2 planetary carrier (No. of teeth: 17) 5. Ring gear (No. of teeth: 61) 6. No. 1 planetary carrier (No. of teeth: 17) 7. No. 1 sun gear (No. of teeth: 14) 8. Oil level gauge/ oil filler port 9. Swing motor

10. No. 1 planetary gear (No. of teeth: 24)11. No. 2 planetary gear (No. of teeth: 22)12. Drain plug 13. Swing circle

SPECIFICATION

Reduction ratio: x = 24.5814 + 6114

17 + 6117

SWING MACHINERY

10-8 PC130-7


TRACK FRAME

1. Idler2. Track frame3. Carrier roller4. Travel motor

5. Sprocket6. Track roller 7. Idler cushion8. Track shoe

TRACK FRAME

PC130-7 10-9


IDLER CUSHION

1. Idler 2. Support 3. Yoke 4. Cylinder 5. Recoil spring 6. U-packing 7. Pilot 8. Nut 9. Valve10. Grease fitting

SPECIFICATIONGrease : G2-LIAmount of filled grease : 140 ml

IDLER CUSHION

10-10 PC130-7


HYDRAULIC COMPONENT LAYOUT

1. Bucket cylinder 2. Arm cylinder 3. Boom cylinder 4. Hydraulic tank 5. Swing motor 6. Hydraulic pump 7. Oil cooler 8. L.H. travel motor 9. Control valve10. 4-spool solenoid valve • PPC lock • 2-speed travel speed selection • Swing holding brake • 2-stage relief11. L.H. PPC valve12. R.H. PPC valve13. Travel PPC valve14. Center swivel joint

HYDRAULIC COMPONENT LAYOUT

PC130-7 10-11

STRUCTURE AND FUNCTION HYDRAULIC COMPONENT LAYOUT

10-12 PC130-7


VALVE CONTROL

VALVE CONTROL

PC130-7 10-13


1. R.H. work equipment PPC valve 2. R.H. work equipment control lever

(for boom and bucket operation) 3. Main pump 4. Control valve 5. 4-spool solenoid valve 6. L.H. work equipment control lever

(for arm, swing operation) 7. L.H. work equipment PPC valve 8. Safety lock lever 9. L.H. travel pedal10. R.H. travel pedal11. L.H. travel lever12. R.H. travel lever13. Travel PPC valve14. Attachment PPC valve

(Attachment installable machine)15. Attachment pedal

(Attachment installable machine)

Lever and Pedal Positions(A) HOLD(B) Boom LOWER(C) Boom RAISE(D) Bucket CURL(E) Bucket DUMP(F) HOLD(G) Arm OUT(H) Arm IN(J) Swing LEFT(K) Swing RIGHT(L) L.H. travel FORWARD(M) L.H. travel REVERSE(N) R.H. travel FORWARD(P) R.H. travel REVERSE(Q) PPC FREE(R) PPC LOCK

VALVE CONTROL

10-14 PC130-7


HYDRAULIC TANK AND FILTER

1. Hydraulic tank 2. Drain plug 3. Oil filler cap 4. Pressure valve 5. Vacuum valve 6. Sight gauge 7. Suction strainer 8. Filter element 9. Bypass strainer10. Bypass valve

SPECIFICATIONTank capacity : 130 lHydraulic oil amount in tank : 90 lPressure valve cracking pressure :

16.7 ± 6.9 kPa {0.17 ± 0.07 kg/cm2}Vacuum valve cracking pressure :

-0.49 – 0 kPa {-0.005 – 0 kg/cm2}Bypass valve set pressure :

103 ± 29.4 kPa {1.05 ± 0.2 kg/cm2}

HYDRAULIC TANK AND FILTER

PC130-7 10-15


HYDRAULIC PUMP (PISTON PUMP)

MAIN PUMPType : HPV95 (for 105cc/rev.)

1. Main pump2. LS valve3. PC valve4. Fixed choke valve5. PC-EPC valve (for PC mode selection)6. LS-EPC valve (for LS set selection)

IM : PC mode change currentPA : Main pump deliveryPB : Main pump pressure inputPS : Main pump absorptionPD1 : Case drainPLS : Control valve LS pressure inletPEPC: EPC valve basic pressure inlet

HYDRAULIC PUMP

10-16 PC130-7


1. Shaft 2. Cradle 3. Case 4. Rocker cam 5. Shoe 6. Piston 7. Cylinder block

8. Valve plate 9. End cap10. Spring11. Servo last chance filter12. Servo piston13. Slider

HYDRAULIC PUMP

PC130-7 10-17


FUNCTION• This pump converts engine rotation and torque

transmitted to the pump shaft into hydraulicenergy and discharges pressurized oil accordingto load.

• This pump can change delivery when the swashplate angle is changed.

STRUCTURE• The cylinder block (7) is supported to the shaft

(1) with the spline a, and the shaft (1) is sup-ported with the front and rear bearings.

• The shoe (5) is punched to the tip of the piston(6) with a concave ball so that the piston (6) andthe shoe (5) form a spherical bearing.

• The shoe (5) is always pressed to the plane A ofthe rocker cam (4) and slides in a circle.The rocker cam (4) leads highly pressurized oiltogether with the cylindrical plane B with the cra-dle (2) fixed to the case, forms a static pressurebearing and slides.

• The piston (6) moves in the axial direction rela-tively in each cylinder of the cylinder block (7).

• The cylinder block (7) rotates relatively whilesealing pressurized oil against the valve plate(8), and the plane is designed to balance the oilpressure properly.

• Oil in each cylinder of the cylinder block (7) isabsorbed and discharged through the valve plate(8).

HYDRAULIC PUMP

10-18 PC130-7


OPERATION1. Pump Operation• The shaft (1) rotates together with the cylinder

block (7), and the shoe (5) slides on the plate A.When the rocker arm (4) moves along the cylin-drical plane B, the inclination to the centerlineX of the rocker cam (4) and the axial direction ofthe cylinder block (7) changes. The inclination

is called "swash plate angle."

• When the swash plate angle of the center line Xof the rocker cam (4) is to the axial direction ofthe cylinder block (7), the plane A works like thecam against the shoe (5).

• Therefore, the piston (6) slides inside the cylin-der block (7), and the capacities E and F of thecylinder block (7) come to change differently.Then, the pump absorbs and discharges the dif-ference E-F.

• When the capacity in the E chamber contracts asthe cylinder block (7) rotates, the pump dis-charges oil during the process. On the otherhand, when the capacity in the F chamberincreases, the pump absorbs oil during the pro-cess. (The figure shows the end of the absorbingprocess in the Chamber F and the end of the dis-charging process in the Chamber E.

• When the centerline X of the rocker cam (4)comes to the axial direction of the cylinder block(7) (when the swash plate angle is 0), the differ-ence between the capacities E and F in the cylin-der block (7) comes to 0. And the pump comesto stop absorbing or discharging oil, i.e., thepump stops. (However, the swash plate anglenever comes to 0 practically.)

• In the other words, the swash plate angle andthe pump delivery are in the proportional rela-tions.

HYDRAULIC PUMP

PC130-7 10-19


2. Delivery Control• When the swash plate angle increases, the

difference between the capacities E and Fbecomes larger and the delivery Q increases.The servo piston (12) changes the swash plateangle .

• The servo piston moves in the direction ofstraight reciprocation according to signal pres-sures of the PC and LS valves. This straightmotion is transmitted to the rocker arm (4)through the slider (13), and the rocker cam (4),which is supported with the cylindrical plane tothe cradle (2), slides in the direction of rotation.

• The servo piston's (12) area receiving the pres-sure is different on the right and left sides, andthe discharge (self) pressure PP from the mainpump is always led to the pressure chamber ofthe small diameter piston.

• The output pressure Pen of the LS valve is led tothe pressure chamber of the large diameter pis-ton.

• Motions of the servo piston are controlledaccording to the relations between the smalldiameter piston pressure PP and the large diam-eter piston pressure Pen and the rate of areareceiving pressure of the small diameter pistonto that of the large diameter piston.

HYDRAULIC PUMP

10-20 PC130-7


LS AND PC VALVELS valve

1. Sleeve 2. Piston 3. Spool 4. Seat 5. Plug 6. Spring 7. Sleeve 8. Nut 9. O-ring10. Nut

PA : Pump pressure inletPB : Pump pressure inletPDP : DrainPLP : Control pressure outletPLS : Over load pressure inletPPL : Control pressure intlePSIG : LS mode switching pressure inlet

PC Valve

1. Piston 2. Spring 3. Seat 4. Spring 5. Seat 6. Spool 7. Piston 8. Sleeve 9. Lock nut

10. Plug11. Lock nut

PA : Pump discharge pressure inletPA2 : Pump discharge pressure inletPD : Drain pressure outletPM : PC mode switching pressure inletPPL : PC valve signal pressure outlet

HYDRAULIC PUMP

PC130-7 10-21


FIXED THROTTLE VALVE

1. Plug2. Plug

PA : Drain pressure outletPOUT : Control pressure outletPIN : LS valve signal pressure inlet

HYDRAULIC PUMP

10-22 PC130-7


FUNCTION1. LS Valve• The LS valve detects loads and controls delivery.• This valve controls the main pump delivery Q

with the differential pressure PLS (PP – PLS)[that is called LS Differential Pressure] betweenthe main pump pressure PP and the controlvalve outlet pressure PLS.

• This valve is applied with the main pump pres-sure PP, the pressure PLS that is obtained fromthe control valve output [that is called LS Pres-sure] and the pressure PSIG from the LS-EPCvalve [that is called LS Selection Pressure].

• The relations of the differential pressure PLS(= PP – PLS) between the main pump pressurePP and the LS pressure PLS with the delivery Qvary with the LS selection current ISIG of the LS-EPC valve as shown in the right figure.

• As ISIG changes from 0 to 1A, the spring setforce changes accordingly, and the selector pointfor pump discharge amount changes from 0.64to 2.1 MPa {6.5 to 21.5 kg/cm2} at the standardmedian.

2. PC Valve• When the pump discharge pressure PP rises,

the control valve spool stroke will increase andthe opening area will enlarge. So, the PC valvecontrols the pump delivery Q so that the deliveryQ does not increase above a certain leveldepending on the discharge pressure PP.The valve also controls the pump absorbinghydraulic horsepower to approximately equalhorsepower so that the pump absorbing horse-power does not exceed the engine horsepower.

• This means that, when a load to the actuatorincreases during operation and the pump dis-charge pressure PP rises, this valve will reducethe pump delivery Q, or when the pump dis-charge pressure PP drops, this valve willincrease the delivery Q.

• In this case, the relations between the pump dis-charge pressure PP and the pump delivery Qchange as shown in the right figure since the cur-rent value given to the PC-EPC valve solenoid isregarded as a parameter.

• However, some PC valves have the function tosense actual engine speeds in the heavy-dutyoperation mode and to reduce the pump deliveryand recover the speed when the speed reducesdue to increase of load.

• In the other words, when an increase of loadreduces the engine speed below the set value,the command current from the controller to thePC-EPC valve solenoid will increase as theengine speed reduces and will reduce the pumpswash plate angle.

HYDRAULIC PUMP

PC130-7 10-23


OPERATION

1. LS Valve1) When the control valve is at the center

value position• The LS valve is a 3-way selector valve, and

the pressure PLS (LS pressure) from thecontrol valve inlet is being led to the springchamber B and the pump discharge pres-sure PP is being led to the H port of thesleeve (8).

• The spool (6) position is determined depend-ing on the force of the LS pressure PLS + theforce of spring (4) Z and the force of thepump discharge pressure (self-pressure) PP.

HYDRAULIC PUMP

10-24 PC130-7


• Before the engine starts, the servo piston(12) is pressed to the right side. (See theright figure.)

• If the control lever is at the "center value"position when the engine starts, the LS pres-sure PLS will be 0 MPa (0 kg/cm2). (The LSvalve interconnects to the drain circuitthrough the control valve spool.)

• At the time, the spool (6) is pressed to the leftside and the C port is connected to the Dport. The pump discharge pressure entersfrom the K port to the piston large diameterside and from the J port to the piston smalldiameter side respectively. So, the area dif-ference of the servo piston (12) minimizesthe swash plate angle.

HYDRAULIC PUMP

PC130-7 10-25


2) Operation in direction for maximum pumpdelivery

• When the LS differential pressure PLSbetween the pump discharge pressure PPand the LS pressure PLS reduces (when thecontrol valve is large and the discharge pres-sure PP drops, for example), the combinedforce of the LS pressure PLS and the spring(4) pushes the spool (6) to the right side.

• When the spool (6) moves, port D is con-nected to port E to bring the PC valve in line.At the time, the PC valve is connected to thedrain port, and the circuit D – K is appliedwith the drain pressure PT. (The operation ofthe PC valve will be explained later.)

• Therefore, the pressure on the piston largediameter side of the servo piston (12) comesto the drain pressure PT, and since the pumpdischargepressure PP is applied to port J onthe small diameter side, the servo piston (12)is pushed to the right side and the swashplate is moved to the delivery increasingdirection.

• When port G is applied with the output pres-sure of the EPC valve for the LS valve, thepiston (7) is pushed to the left side.

• This is effective to reduce the spring (4) setforce, and the differential pressure betweenthe oil pressure PP when ports D and E ofthe spool (6) are connected and PPchanges.

HYDRAULIC PUMP

10-26 PC130-7


3) Operation in direction for minimum pumpdelivery

• The following explains move of the servo pis-ton (12) to the left side (in the direction forminimum pump delivery). When the LS dif-ferential pressure PLS increases (whenthe control valve opening area becomessmall and the pump discharge pressure PPincreases, for example), the force of the dis-charge pressure PP pushes the spool (6) tothe left side.

• As the spool (6) moves, the pump dischargepressure PP flows from port C to port D andcomes from port K to the piston large diame-ter side.

• Though the pump discharge pressure PPcomes to port J of the piston small diameterside, the servo piston (12) is pushed to theleft side due to the area difference betweenthe piston large diameter side and the pistonsmall diameter side of the servo piston (12)and the swash plate is moved in the deliveryreducing direction.

• When port G is applied with the LS selectionpressure, it is effective to reduce the spring(4) set force.

HYDRAULIC PUMP

PC130-7 10-27


4) When the servo piston balances• The area receiving the pressure on the pis-

ton large diameter side is supposed to beA1, the one on the small diameter side issupposed to be A0 and the pressure flowingto the piston large diameter side is supposedto be PEN.

• When the pump discharge pressure PP ofthe LS valve balances with the combinedforce of the LS pressure PLS and the spring(4) force Z and the relations of A0 x PP = A1x PEN are satisfied, the servo piston (12)stops at the position and the swash plate isheld at the intermediate position (stopswhere the opening from port D to port E ofthe spool (6) is almost equal to the one fromport C to port D).

• At the time, the relations of areas receivingthe pressure on the both ends of the servopiston (12) are A0 : A1 = 1 : 1.75, and theones of pressures applied on the piston bothends at the balancing time are PP : PEN =1.75 : 1 approximately.

• The spring (4) force has been adjusted sothat the balance stop position of the spool (6)is determined when PP – PLS = 2.21 MPa{22.5 kg/cm2} is satisfied at the standardcenter.

• When port G is applied with PSIG (EPCvalve output pressure for LS valve of 0 – 2.9MPa {10 – 30 kg/cm2}), however, the bal-ance stop position changes proportionally tothe PSIG pressure in the range of PP – PLSfrom 2.1 to 0.6 MPa {21.5 to 6.5 kg/cm2}.

HYDRAULIC PUMP

10-28 PC130-7


2. PC Valve(1) When the pump controller is normal, the

load to the actuator is small and the pumpdischarge pressure PP is low1) Function of PC-EPC Valve Solenoid

(1) • The pump controller provides a com-

mand current to the PC-EPC valve sole-noid (1). This command current actuatesthe PC-EPC valve and outputs a signalpressure. When receiving the signalpressure, the PC valve changes theforce given to the piston (2).

• The spool (3) stops where the force tothe piston (2) balances with the com-bined force of the spring setting force ofthe springs (4) and (6) on the oppositeside and the force given to the spool (3)by the pump discharge pressure PP.

And the pressure output from the PCvalve (the pressure at the C port) varieswith the spool position.

• The value of the command current X isdetermined depending on type of work(lever control), selection of workingmode, set point of engine speed andactual speed.

HYDRAULIC PUMP

PC130-7 10-29


2) Function of Spring• The loads to the springs (4) and (6) of the

PC valve are determined depending onswash plate position.

• As the servo piston (9) moves, the piston(7) connected to the slider (8) moves tothe right or the left.

• When the piston (7) moves to the left, thespring (6) will be contracted. If the pistonmoves further to the left, the spring willbe brought to the seat (5) and be fixedthere. Thereafter, the spring (4) will onlymove. This means that the spring loadchanges as the piston (7) extends orcontracts the springs (4) and (6).

• Also, since the pressing force of the pis-ton (2) changes as the command currentinput to the PC-EPC valve solenoid (1)changes, the load to the springs (4) and(6) changes depending on the value ofthe command current.

• The C port of the PC valve is connectedto the E port of the LS valve. The selfpressure PP is provided to the A port, thesmall diameter side of the servo piston(9) and the B port.

HYDRAULIC PUMP

10-30 PC130-7


• When the pump discharge pressure PPis small, the spool is located at a positionin the left direction. At the time, the Cport is connected to the D port, and thepressure to the LS valve becomes thedrain pressure PT. If the E port of the LSvalve is connected to the G port at thetime, the pressure from the J port to thelarge diameter side of the piston willbecome the drain pressure PT. And theservo piston will moves to the right side.Then, the pump delivery will come toincrease.

• Also, as the servo piston (9) operates,the slider (8) moves the piston (7) to theright side, and the spring force becomesweak because the springs (4) and (6)expand. As the spring force becomesweak, the spool (3) moves to the rightside to disconnect the C port from the Dport. Then, the pump discharge pres-sure ports B and C are connected.

• As a result, the pressure at the C portrises and the pressure on the large diam-eter side of the piston rises as well, andthe servo piston (9) stops moving to theright side. This means that the stop posi-tion of the servo piston (9) (= pump deliv-ery) is determined where the pressingforce caused the pressure PP to thespool (3), the pressing force of the PC-EPC valve solenoid and the forces of thesprings (4) and (6) balance with eachother.

HYDRAULIC PUMP

PC130-7 10-31


(2) When the pump controller is normal, theload to actuator is large and the pumpdischarge pressure PP is high

• When the load is large and the pump dis-charge pressure is high, the force pushingthe spool (3) to the left side increases andthe spool (3) comes to the position shown inthe above figure.

• Then, the pressure flowing from the C port tothe LS valve becomes about 3/5 of the pumpdischarge pressure PP because the pres-sure from the A port partly flows from the Cport to the D port through the LS valve asshown in the above figure.

• When the E port of the LS valve is connectedto the G port, this pressure is led from the Jport to the large diameter side of the servopiston (9) and the servo piston comes tostop.

• When the pump discharge pressure PPincrease and the spool (3) moves further tothe left side, the discharge pressure PP willflow to the C port so as to minimize the pumpdelivery.

HYDRAULIC PUMP

10-32 PC130-7


• When the servo piston (9) moves to the leftside, the piston (7) will move to the left. Then, the springs (4) and (6) will be com-pressed and will push the spool (3) back. Ifthe piston (7) moves further to the left, theports C and D will open wide.

• As a result, the pressure at the port C (= J)will drop, and the servo piston (9) will moveto the left and will stop. At the time, the servo piston (9) is locatedfurther to the left than where it is when thepump discharge pressure PP is low.

• The positional relations between the pumpdischarge pressure PP and the servo piston(9) are shown by a broken line because thesprings (4) and (6) are 2-stage ones. Andthe relations between the discharge pressurePP and the pump delivery Q are as shown inthe right figure.

• Also, when the command current X to thePC-EPC valve solenoid increases, the rela-tions between the pump discharge pressurePP and the pump delivery Q will move in par-allel in relation to the pushing force of thePC-EPC valve solenoid. Therefore, the forceof the PC-EPC valve solenoid (1) will beadded to the leftward pressing force of thedischarge pressure PP to the spool (3), andthe relations between PP and Q will movefrom to as X increases.

HYDRAULIC PUMP

PC130-7 10-33


3) When the pump controller is out of orderand the PC redundant switch is set to ON1) In case of light load to main pump• When the pump controller is out of order,

set the PC redundant switch to ON tochange the circuit to the resistor side. Inthis case, since the current is too largewhen the power is directly taken from thebattery, the resistor is connected to con-trol the current to the PC-EPC valve sole-noid.

• At the time, the current becomes con-stant and the piston (2) pressing forcebecomes constant as well.

• When the pump discharge pressure islow, the combined force of the force ofthe PC-EPC valve solenoid (1) and thedischarge pressure PP is smaller thanthe spring set force. So, the spool (3)balances at a position in the left side.

• At the time, the C port has the samepressure as the drain pressure at the Dport, and the drain pressure PT is led tothe large diameter side of the servo pis-ton (9) through the LS valve. Then, theservo piston (9) moves in the dictionwhere the delivery increases becausethe pressure on the small diameter sideof the piston is large.

HYDRAULIC PUMP

10-34 PC130-7


2) In case of heavy load to main pump• When the PC redundant switch is set to

ON just like in the previous paragraph, aconstant command current is sent to thePC-EPC valve solenoid (1). So, the pis-ton (2) pushes the spool (3) with a con-stant force.

• When the pump discharge pressure PPrises, the spool will moves further to theleft side than when the main pump islightly loaded and will balance at theposition shown in the above figure.

• In this case, since the pressure from theA port is led to the C port, the servo pis-ton (9) will move to the left side (smalldelivery) and will stop at a position fur-ther to the left than when the pump islightly loaded.

HYDRAULIC PUMP

PC130-7 10-35


• This means that the current, which issent to the PC-EPC valve solenoidthrough the resistor when the PC redun-dant switch is set to On, determines thecurve between the pump discharge pres-sure PP and the delivery Q as shown inthe figure.

• When the PC redundant switch is set toON, the curve is further to the leftthan the curve drawn when the pumpcontroller is normal.

HYDRAULIC PUMP

10-36 PC130-7


CONTROL VALVE

OUTLINEThere are the following 2 types of contral valve. • 6-spool valve (without service valve) • 7-spool valve (with service valve) • 7-spool valve (with blade) • 8-spool valve (with blade and service valve)a Each service valve is a single add-on type, so it

is possible to add or remove the extra valve atany time.

Extermal oppearance and cross section is given onlyfor the 7 spool valve.

AA : Pressure sensor port (pressure sensor is intalled)

A1 : To swing motor MBA2 : To L.H. travel motor AA3 : To R.H. travel motor AA4 : To boom cylinder bottomA5 : To arm cylinder headA6 : To bucket cylinder headA7 : To attachment 1B1 : To swing motor MAB2 : To L.H. travel motor BB3 : To R.H. travel motor BB4 : To boom cylinder headB5 : To arm cylinder bottomB6 : To bucket cylinder bottomB7 : To attachment 1BP : From boom RAISE PPC/EPC valveLS : To pump LS valvePA1 : From swing L.H. PPC/EPC valvePA2 : From L.H. travel forward PPC valvePA3 : From R.H. travel reverse PPC valvePA4 : From boom RAISE PPC/EPC valvePA5 : From arm OUT PPC/EPC valvePA6 : From bucket DUMP PPC/EPC valvePA7 : From service 1 PPC valvePB1 : From swing R.H. PPC/EPC valvePB2 : From L.H. travel reverse PPC valvePB3 : From R.H. travel forward PPC valvePB4 : From boom LOWER PPC/EPC valvePB5 : From arm IN PPC/EPC valvePB6 : From bucket CURL PPC/EPC valvePB7 : From service 1 PPC valveP : From main pumpPP : To main pumpPX : From 2-stage relief solenoid valveSA : From swing stroke contral solenoid valveSB : From swing stroke contral solenoid valveTS1 : To tankTS2 : To tankTB : To tankTC : To oil coolerTSW : To swing motor

1. Swing bleed valve 2. Travel junction valve 3. Arm regeneration valve 4. Cover 5. Service valve 6. Bucket valve 7. Arm valve 8. Boom valve 9. R.H. travel valve10. L.H. travel valve11. Swing valve12. PT port block13. Safety-suction valve

CONTROL VALVE

PC130-7 10-37


7 spool valve(6 spool valve + service valve)

CONTROL VALVE

10-38 PC130-7


CROSS-SECTIONAL DRAWINGa Cross-sectional drawing shows 7-spool valve (6-spool + service valve).(1/8)

1. Safety-suction valve 2. Suction valve (L.H. travel A) 3. Suction valve (R.H. travel A) 4. Suction valve (Boom bottom) 5. Suction valve (Arm head) 6. Suction valve (Bucket head) 7. Safety-suction valve mount (service A)

8 Safety-suction valve mount (service B) 9. Suction valve (Bucket bottom)10. Suction valve (Arm bottom)11. Suction valve (Boom head)12. Suction valve (R.H. travel B)13. Suction valve (L.H. travel B)14. Lift check valve

CONTROL VALVE

PC130-7 10-39


(2/8)

1. Main relief valve2. Spool (swing)3. Spool (L.H. travel)4. Spool (R.H. ravel)5. Spool (boom)6. Spool (arm)7. Spool (bucket)8. Spool (service)

CONTROL VALVE

10-40 PC130-7


(3/8)

1. Pressure compensation valve F (swing) 2. Pressure compensation valve F (L.H. travel) 3. Pressure compensation valve F (R.H. travel) 4. Pressure compensation valve F (boom) 5. Pressure compensation valve F (arm) 6. Pressure compensation valve F (bucket) 7. Pressure compensation valve F (service) 8. Unload valve

9. Pressure compensation valve R (service)10. Pressure compensation valve R (bucket)11. Pressure compensation valve R (arm)12. Pressure compensation valve R (boom)13. Pressure compensation valve R (R.H. travel)14. Pressure compensation valve R (L.H. travel)15. Pressure compensation valve R (swing)

a The above F and R means the following valves :F : Flow control valveR : Pressure reducing valve

CONTROL VALVE

PC130-7 10-41


(4/8)

1. LS pressure detection plug2. LS bypass plug3. Pump pressure detection plug4. Check valve (bucket head)5. Check valve (arm head)6. LS selection valve

CONTROL VALVE

10-42 PC130-7


(5/8)

1. Main relief valve2. Cooler bypass valve3. Lift check valve4. LS selection valve5. Spool (swing)6. Pressure compensation valve R

7. Swing bleed valve8. Pressure compensation valve F

F : Flow control valveR : Pressure reducing valve

CONTROL VALVE

PC130-7 10-43


(6/8)

1. Suction valve (A) 2. Suction valve (B) 3. Spool (L.H. travel) 4. Pressure compensation valve R 5. Travel junction valve 6. Pressure compensation valve F 7. Suction valve (A)

8. Suction valve (B) 9. Spool (R.H. travel)10. Pressure compensation valve R11. Pressure compensation valve F


CONTROL VALVE

10-44 PC130-7


(7/8)

1. Suction valve (A) 2. Suction valve (B) 3. Spool 4. Pressure compensation valve R 5. Pressure compensation valve F 6. Suction valve (A) 7. Suction valve (B)

8. Spool 9. Pressure compensation valve R10. Arm regemeration valve11. Pressure compensation valve F


CONTROL VALVE

PC130-7 10-45


(8/8)

1. Suction valve (A) 2. Suction valve (B) 3. Spool 4. Pressure compensation valve R 5. Pressure compensation valve F 6. Safty-suction valve mount (A) 7. Safty-suction valve mount (B) 8. Spool

9. Pressure compensation valve R10. Pressure compensation valve F11. Pressure relief plug12. Unload valve


CONTROL VALVE

10-46 PC130-7


SUCTION SAFETY VALVE(SAFETY VALVE WITH SUCTION FOR SERVICE PORT)

1. Suction valve 2. Main valve 3. Piston 4. Piston spring 5. Poppet 6. Poppet spring 7. Suction valve 8. Sleeve 9. Adjustment screw10. Lock nut

SPECIFICATION

Part No. (Reference) Set pressure Use

709-70-74600 24.5 MPa {250 kg/cm2}(at the time of 5l/min.) For crusher

709-70-74700 17.2 MPa {175 kg/cm2}(at the time of 5l/min.)

SUCTION SAFETY VALVE

PC130-7 10-47


CLSS

OUTLINE OF CLSSFeaturesCLSS stands for Closed Center Load Sensing Sys-

tem and is featured as follows :• Fine controllability without affect of load• Controllability that allows digging even in the fine

control mode.• Ease of compound operation in which the flow

distribution performance depends on spoolopening area during compound operation.

• Saving of energy by variable pump control

Configuration• The CLSS consists of a variable displacement

piston pump, a control valve and actuators.• The pump body consists of a main pump, a PC

valve and an LS valve.

CLSS

10-48 PC130-7


Basic principle1. Control of pump swash plate angle• The pump swash plate angle (pump delivery) is

controlled so that the LS differential pressurePLS, which is the difference between the pump

discharge pressure PP and the LS pressure PLS(actuator load pressure) at the control valve out-let, becomes constant.(LS differential pressure PLS = Pump pressurePP - LS pressure PLS)

• When the LS differential pressure PLS reducesbelow the set pressure of the LS valve (when theactuator load pressure is high), the pump swashplate angle will move in the direction of maxi-mum. When the set pressure is raised (when theactuator load pressure is low), the pump swashplate angle will move in the direction of mini-mum.

a For the detail of the operation, see the paragraphof "Hydraulic Pump."

CLSS

PC130-7 10-49


2. Pressure compensation control• A valve (pressure compensation valve) is

mounted on the outlet side of the control valve.In case of compound operation of the actuatorwith this valve, the differential pressure Pbetween the spool upstream (inlet) and thedownstream (outlet) of each valve becomes con-stant irrespective of load (pressure). So, the flowfrom the pump is distributed (compensated) inproportion to the opening areas S1 and S2 ofeach valve being operated.

CLSS

10-50 PC130-7


EACH FUNCTION AND OPERATION OF EACH VALVEHydraulic circuit diagram and valve names

CLSS

PC130-7 10-51


1. Unload valveSet pressure : 3.38 MPa {34.5 kg/cm2}

2. Safety-suction valveSet pressure : 35.8 MPa {365 kg/cm2}

3. Pressure compensation valve 4. Suction valve 5. Main relief valve

Set pressure : normal: 31.9 MPa {325 kg/cm2} High pressure : 34.8 MPa {355 kg/cm2} 6. Lift check valve 7. Cooler bypass valve 8. LS selection valve 9. Swing bleeding valve10. Travel junction valve11. Arm regeneration valve

CLSS

10-52 PC130-7


UNLOAD VALVE1. When the control valve is neutral

FUNCTION• When the control valve is neutral, the delivery Q

equivalent to the pump minimum swash plateangle is released to the tank circuit. At the time,the pump discharge pressure PP is set to 2.45MPa {25.0kg/cm2} with the spring (3) inside thevale. (The LS pressure PLS is 0 MPa {0kg/cm2}.)

OPERATION• The pump discharge pressure PP is applied to

the left end face of the spool (4) and the LS pres-sure PLS is applied to the right end face.

• Since the LS pressure PLS is 0 when the controlvalve is neutral, the pump discharge pressurePP is only applied and is set with the lead to thespring (3).

• When the pump discharge pressure PP rises tothe spring (3) load (2.45 MPa {25.0 kg/cm2}), thespool (4) will move toward the right side and thepump circuit PP will interconnect to the tank cir-cuit T through the drill hole.

• Therefore, the pump discharge pressure PP isset to 2.45 MPa {25.0 kg/cm2}.

1. Unload valve2. Sleeve 3. Spring4. Spool

PLS : LS circuit (pressure)PP : Pump circuit (pressure) T : Tank circuit

CLSS

PC130-7 10-53


2. When the control valve is in the fine controlmode

FUNCTION• When the control valve is in the fine control

mode and the requested flow of the actuator isless than the pump minimum swash plate angle,the pump discharge pressure PP is set to the LSpressure PLS + 2.45 MPa {25.0 kg/cm2}.

When the differential pressure between the dis-charge pressure PP and the LS pressure PLScomes to the spring (3) load (2.45 MPa {25.0 kg/cm2}), the unload valve will open and the LS dif-ferential pressure PLS will come to 2.45 MPa{25.0 kg/cm2}.

OPERATION• When the control valve is operated in the fine

control mode, the LS pressure PLS will occurand will be applied to the right end face of thespool (4). At the time the differential pressurebetween the LS pressure PLS and the pump dis-charge pressure PP increases because theopening area of the control valve spool is small.

• When the differential pressure between thepump discharge pressure PP and the LS pres-sure PLS comes to the spring (3) load (2.45 MPa{25.0 kg/cm2}), the spool (4) will move to theright side and the pump circuit PP will intercon-nect to the tank circuit T.

• This means that the pump discharge pressurePP is set to the spring force (2.45 MPa {25.0 kg/cm2} + LS pressure PLS, and the LS differentialpressure PLS comes to 2.45 MPa {25.0 kg/cm2}.

1. Unload valve2. Sleeve3. Spring4. Spool

PLS : LS circuit (pressure)PP : Pump circuit (pressure)T : Tank circuit

CLSS

10-54 PC130-7


3. When the control valve is operated

FUNCTION• If the required flow of the actuator increases over

the pump minimum swash plate angle when thecontrol valve is operated, the flow to the tank cir-cuit T will be interrupted and the pump delivery Qwill be completely flown to the actuator circuit.

OPERATION• When the control valve is operated with large

stroke, the LS pressure PLS will occur and willbe applied to the right end face of the spool (4).At the time, the opening areas of the controlvalve spool is large and the difference betweenthe LS pressure PLS and the pump dischargepressure PP is small.

• So, the differential pressure between the pumpdischarge pressure PP and the LS pressure PLSdoes not reach the spring (3) load (2.45 MPa{25.0 kg/cm2}) and the spring (3) pushes thespool (4) to the left side.

• Then, the pump circuit PP and the tank circuit Tare interrupted, and the pump delivery Q is com-pletely flown to the actuator circuit.

1. Unload valve2. Sleeve3. Spring4. Spool

PLS : LS circuit (pressure)PP : Pump circuit (pressure)T : Tank circuit

CLSS

PC130-7 10-55


LEADING OF LS PRESSUREFUNCTION• The LS pressure is load pressure to the actuator

on the outlet side of the control valve.• In case of a work equipment valve, the pressure

reducing valve (3) of the pressure compensationvalve reduces the pump discharge pressure PPto the same level as the actuator circuit pressureA and leads the pressure to the LS circuit PLS.

Also, the orifice C is mounted on the piston (5)halfway from the pump circuit PP to the pressurereducing valve (3), and the orifice has thedamper function.

• The travel valves leads the actuator circuit pres-sure A directly to the LS circuit PLS.

1. Work equipment valve (boom, arm, bucket, swing)

OPERATION• When the spool (1) is operated, the pump dis-

charge pressure PP will be led to the actuatorcircuit A through the bridge passage b from theflow control valve (2) and the spool notch a.

• Since the pressure reducing valve (3) moves tothe right at the same time, the pump dischargepressure PP led from the orifice c is reduced dueto pressure loss at the notch d and is led to theLS circuit PLS and to the spring chamber PLS1.

• At the time, the LS circuit PLS is connected tothe tank circuit T from the LS bypass plug (4).

• The both end face areas of the pressure reduc-ing valve (3) are the same (SA = SLS), and theactuator circuit pressure PA (= A) is applied tothe SA side and the reduced pump dischargepressure PP is applied to the SLS side on theopposite side.

• Therefore, the pressure reducing valve (3) bal-ances at the position where the actuator circuitpressure PA becomes equal to the pressure ofthe spring chamber PLS1. The pump dischargepressure PP reduced at the notch d comes to theactuator circuit pressure A and is led to the LScircuit PLS.

CLSS

10-56 PC130-7


2. Travel valve

OPERATION • When the spool (1) is operated, the pump dis-

charge pressure PP will be led to the actuatorcircuit A through the bridge passage b from theflow control valve (2) and the spool notch a.

• At the same time, the actuator circuit pressurePA moves the pressure reducing valve (3) to theright side, and the notches c and d interconnectto the travel junction circuit e and the LS circuitPLS respectively.

• So, the actuator circuit pressure PA (= A) is ledfrom the notch c to the LS circuit PLS throughthe notch d.

a The travel circuit is different from the work equip-ment circuit, the actuator circuit pressure PA isdirectly led to the LS circui PLS.

CLSS

PC130-7 10-57


LS BYPASS PLUGFUNCTION• This plug released residual pressure of the LS

pressure PLS.• This plug slows the rising speed of the LS pres-

sure PLS, causes pressure losses at the spooland the throttle of the shuttle valve by the dis-carded throttled flow and reduces the effectiveLS differential pressure for higher safety.

OPERATION• Pressurized oil in the LS circuit PLS flows from

the clearance filter a in the space between theLS bypass plug (1) and the valve body to thetank circuit T through the orifice b.

1. LS bypass plug

PLS : LS circuit (pressure)T : Tank circuit (pressure)

CLSS

10-58 PC130-7


PRESSURE COMPENSATION VALVEFUNCTION• When the load pressure becomes lower than

another actuator and the flow is going toincrease during a compound operation, thisvalve compensates the load pressure. (At thetime, the load pressure of another actuator undercompound operation (the upper side) is higherthan that of the actuator on this side (the lowerside).

CLSS

PC130-7 10-59


OPERATION• When the load pressure of another actuator side

(the upper side) rises during a compound opera-tion, the flow in the actuator circuit A on this side(the lower side) is apt to increase.

• In this case, the LS pressure PLS of anotheractuator is applied to the spring chamber PLS1and pushes the pressure reducing valve (1) andthe flow control valve (2) to the left side.

• The flow control valve (2) throttles the openingarea between the pump circuit PP and the spoolupstream PPA and causes a pressure lossbetween PP and PPA.

• The flow control valve (2) and the pressurereducing valve (1) balance each other where thepressure difference between PA applied to theboth end faces of the pressure reducing valve (1)and PLS becomes the same as the pressureloss between PP before and after the flow controlvalve and PPA.

• So, the pressure differences between theupstream pressures PPA and the downstreampressures PA of the both spools under com-pound operation become the same, and thepump flow is distributed in proportion to theopening area of each spool notch a.

CLSS

10-60 PC130-7


AREA RATIO OF PRESSURE COMPENSATION VALVEFUNCTION• The pressure compensation valve slightly adjust the ratio (S2/S1) of the area S1 on the left side of the flow

control valve (2) and the area S2 on the right side of the pressure reducing valve (1) to suite the character-istics of each actuator and determines the compensation characteristics.

S1 : Area of the flow control valve (2) - area of the piston (3)S2 : Area of the pressure reducing valve (1) - area of the piston (3)

Area ratio (S1:S2) and compensation characteristics• When the ratio is 1.00 : The expression [Pump (discharge) pressure PP - Spool notch upstream pressure

PPB] [LS circuit pressure PLS - Actuator circuit pressure PA (= A)] can be held,and the flow is distributed as per the spool opening area ratio.

• When the ratio is more than 1.00 : The expression PP - PPB > PLS - PA (= A) can be held, and the flow isdistributed less than the spool opening area ratio.

• When the ratio is less than 1.00 : The expression PP - PPB < PLS - PA (= A) can be held, and the flow isdistributed more than the spool opening area ratio.

CLSS

PC130-7 10-61


ARM REGENERATION CIRCUIT1. At arm in and own weight fall

FUNCTION• When the arm falls due to its own weight

because the head pressure A in the arm cylinder(1) is higher than the bottom pressure B duringarm digging, this circuit brings the return flow onthe head side to the bottom side to increase thecylinder speed.

OPERATION• When the arm falls for digging due to its own

weight, the head side pressure A in the arm cyl-inder (1) will rise above the bottom side pressureB.

• At the time, part of the return flow on the headside passes through the regeneration passage aof the arm spool (2), pushes the check valve (3)to open it and flows to the bottom side.

• This increases the arm digging speed.

1. Arm cylinder2. Arm spool3. Check valve

A : Head circuit (pressure)B : Bottom circuit (pressure)PP : Pump circuit (pressure)

CLSS

10-62 PC130-7


2. At arm in process

FUNCTION• When the bottom pressure B of the cylinder (1)

rises above the head pressure A and the armenters the digging process, the check valve (3)will be closed and the circuits on the head sideand the bottom side will be interrupted.

OPERATION• When the arm is in the digging process, the bot-

tom side pressure B of the arm cylinder (1) willrise, close the check valve (3) and interrupt thecircuits on the head side and the bottom side.

1. Arm cylinder2. Arm spool3. Check valve

A : Head circuit (pressure)B : Bottom circuit (pressure)PP : Pump circuit (pressure)

CLSS

10-64 PC130-7


TRAVEL JUNCTION VALVE(L.H. and R.H. travel junction circuit)

1. When traveling straight

CLSS

PC130-7 10-65


FUNCTION• When the L.H. and R.H. travel spool is operated

to compensate flow errors in the L.H. and R.H.travel circuits during straight travel, the junctioncircuit will open.

• Then, the flows to the L.H. and R.H. travelmotors will become the same during the straighttravel, and travel deviation will decrease.

• At the time of steering, load pressure differencebrings back the pressure reducing valve of thetravel valve inside the steering and closes thespool notch opening of the travel junction valveto close the junction circuit for steering.

OPERATION• When the L.H. and R.H. travel spool (1) is oper-

ated, the pump delivery will flow from the pumpcircuit PP to A through the actuator circuit PA.

• When traveling straight, the actuator circuit PAwill be equalized and the L.H. and R.H. pressurereducing valves (2) will be pressed the samestroke to the right. Then, the notch a and thejunction circuit will open.

• The L.H. travel forward oil pressure P1 and theR.H. travel forward oil pressure P2 are led to thespring chamber on the both end of the traveljunction valve spool (4) through the respectiveshuttle valves (5). So, P1 = P2, and the spool isat the neutral position, and the notch d is?open?.

• Then, the L.H. and R.H. travel actuator circuitsare interconnected with the junction circuit.When any difference occurs in the flows to theL.H and R.H. travel motors, this valve will com-pensate them and will reduce occurrence oftravel deviations.

CLSS

10-66 PC130-7


2. When operating travel steering

CLSS

PC130-7 10-67


OPERATION• When the L.H. travel spool (L.H. 1) is returned to

the neutral side from the straight traveling stateand the steering is operated, there will occur anydifference in the load pressures in the L.H. andR.H. travel actuator circuits PA (R.H. A > L.H. A).The LS pressure PLS will become the same asthe R.H. A on the higher load pressure side.

• Therefore, the flow control valve on the L.H.travel side is pressed to the left side with the LSpressure PLS, i.e., the load pressure on the R.H.travel side, and the notch a closes to interruptthe L.H. and R.H. travel circuits. Also, since thepressures in the spring chambers on the bothends of the travel junction valve spool (4)become different and P1 becomes higher thanP2, the spool (4) moves to the P1 side and thenotch d closes. Then, the steering can be oper-ated.

• The damper is provided to relax the transitioncharacteristics of the junction circuit at the timeof abrupt operation.

CLSS

10-68 PC130-7


TRAVEL LS BYPASS CIRCUIT1. At normal operation

CLSS

PC130-7 10-69


FUNCTION• When an actuator is operated during travel, this

circuit will increase the discarded throttled flow ofthe LS circuit PLS, loosen the pressure compen-sation accuracy of the travel circuit and limitsreduction of the travel speed to small extent.

• The bypass circuit is closed in case of indepen-dent travel or independent operation of an actua-tor.

OPERATION• When the boom spool (1) is operated, the LS cir-

cuit PLS will come to the same pressure as theboom circuit pressure A1.

• At the same time, the LS circuit pressure PLS isled to the spring chamber PLS1 of the pressurereducing valve (2) of the travel valve.

• Since the travel spool is not operated, the travelactuator circuit PA is closed and the check valve(4) inside the flow control valve (3) is also closed.

• Therefore, the travel LS bypass circuit is closedin case of independent operation of the boom.

CLSS

10-70 PC130-7


2. At operation of travel + other actuator

CLSS

PC130-7 10-71


OPERATION• When the boom spool (1) is operated, the LS cir-

cuit PLS will come to the same pressure as theboom circuit pressure A1.

• Since the actuator circuit pressure is generallyhigher at boom RAISE than during travel (A1 >A2), the pressure in the spring chamber PLS1 ofthe flow control valve (3) on the travel side ishigher than the travel circuit pressure PA.

• So, the pressure reducing valve (2) moves to theleft side, and the LS pressure of the springchamber PLS1 pushes the check valve (4) fromthe orifice a to open it and flows to the travel cir-cuit PA through the passages b and c.

• Therefore, when the LS circuit pressure PLS,which has been as high as the boom circuit pres-sure A1, flows to the travel circuit A2, the pres-sure will drop.

CLSS

10-72 PC130-7


3. At simultaneous operation of boom + swing

FUNCTION• When the boom is raised at the time of swinging,

the swing pool stroke will be controlled and theflow to the boom will be distributed more to raisethe boom more.

1) When the boom is not raised

OPERATION• Since the SA and SB ports are interconnected to

the drain and no force is given to the piston (2),the stroke of the spool (1) is not controlled. So,the spool (1) comes to the cases (4) and (5) andthe stroke increases by ST1. This increases thefiltering oil flow.

1. Spool (swing) 2. Piston3. Plug4. Case5. Case

ST1 : Spool stroke

CLSS

PC130-7 10-73


2) At simultaneous operation of boom RAISE

OPERATION• When the boom RAISE PPC pressure is led to

the piston (2) as the stroke control pilot pressurePS through the SA and SB ports, the piston (2)will be pressed in the inner direction.

• At the time, the maximum stroke of the spool (1)will shorten (by ST0) due to control of the piston(2). Boom RAISE OFF ST1 > Boom RAISE ONST0

• The spool (1) stroke is controlled and shortens.If the boom is raised at the time of swing (hoistswing), the notch a opening area will decrease.So, the flow distribution to the boom will increaseand the boom will rise higher at the time of hoistswing.

CLSS

10-74 PC130-7


SWING BLEED VALVEFUNCTION• For swing operation, a bleed valve is provided to

the pressure reducing valve to raise the LS pres-sure slowly and to smooth the swing operation.

1. Swing at neutral position

OPERATION• Since the notch a of the pressure reducing valve

(1) and the LS circuit are closed and the bleed-off circuit and the LS circuit are also closed, theLS pressure PLS is not affected by operation ofother work equipment.

• The pump discharge pressure PP is also inter-rupted from the bleed-off circuit with the piston(2) and is not affected.

• The notch b of the bleed spool (3) and the bleed-off circuit are interconnected each other.

CLSS

PC130-7 10-75


2. At swing fine control

OPERATION• The pressure reducing valve moves in the right

direction, and the notch a and the LS circuit inter-connect each other. Also, the pump circuit PP,the bleed-off circuit and the LS circuit intercon-nect each other through the piston (2).

• The bleed spool (3) moves in the left direction inproportion to raise of the swing PPC pressurePA. But the notch b throttles and interconnect tothe bleed-off circuit in the fine control region anddetermines the intermediate pressure before thepump discharge pressure PP is reduced andapplied to the LS pressure PLS.

• Therefore, the intermediate pressure is set lowerthan the pump discharge pressure PP and risesas the bleed spool (3) moves . So, the LS pres-sure PLS rises slowly.

CLSS

10-76 PC130-7


3. At full swing operation

OPERATION• When the swing PPC pressure PA comes to the

maximum, the notch b of the bleed spool (3)interrupt the bleed-off circuit. The intermediatepressure becomes equal to the pump dischargepressure PP, and the LS pressure PLS becomesequal to the actuator circuit pressure.

CLSS

PC130-7 10-77


LS SELECT VALVEFUNCTION• At the time of simultaneous operation of swing +

boom RAISE, this valve prevents high swing LSpressure from entering the LS circuit PLS andalso prevents the boom RAISE speed fromreducing by securing the pump flow at the time ofswing drive.

1. During normal operation

OPERATION• The pilot pressure is not generally applied to the

pilot port BP except for boom RAISE operation.• In this state, the pump discharge pressure PP

pushes the valve (1) to open it and is led to thepressure reducing valve (4) of the swing valve.At the time of swing operation, there occurs theLS pressure PLS suitable for the load pressure,and the pressure is led to the pump LS valve.

CLSS

10-78 PC130-7


2. At simultaneous operation of swing + boom RAISE

OPERATION• At the simultaneous operation of swing + boom

RAISE, the signal pressure of the PPC circuit isled to the pilot port BP.

• When this pilot pressure BP is applied to the pis-ton (2) and reaches a pressure that is strongerthan the spring (3), the piston (2) will be pushedto the left side, the valve (1) will close and thepump discharge pressure PP will not come toflow to the pressure reducing valve (4) of theswing valve.

• Then, the swing pressure does not cause LSpressure PLS, but the LS pressure PLS causethe boom RAISE pressure is led to the pump LSvalve, and the pump delivery is controlled withthe boom RAISE LS pressure.

• The pilot pressure BP depends on the controllever stroke.

CLSS

PC130-7 10-79


SELF PRESSURE REDUCING VALVE

P1 : From pumpPR : Supply to solenoid valve, PPC valve and EPC valve.T : To hydraulic tank


10-80 PC130-7


1. Control valve block 2. Valve (sequence valve) 3. Spring 4. Screw 5. Poppet 6. Spring (pressure reducing valve pilot)

7. Spring (pressure reducing valve main) 8. Valve (pressure reducing valve) 9. Spring (safety valve)10. Ball11. Filter


PC130-7 10-81


FUNCTION• The self pressure reducing valves reduces the

discharge pressure of the main pump and sup-plies it to the solenoid valve, the PPC valve, etc.as the control pressure.


10-82 PC130-7


1. At engine stop (total low pressure)

OPERATION• The spring (6) pushes the poppet (5) t the seat,

and the circuit between the ports PR and T isclosed.

• The spring (7) pushes the valve (8) to the leftside, and the circuit between the ports P1 andPR is open.

• The spring (3) pushes the valve (2) to the leftside, and the circuit between the ports P1 and P2is closed.


PC130-7 10-83


2. At neutral and reduction of load pressure P2(at own weight fall in boom LOWER and armIN)

Note : When the load pressure P2 is lower than theoutput pressure PR of the self pressurereducing valve.

OPERATION• The spring (3) and the PR pressure (0 MPa {0

kg/cm2} at the time of engine stop) pushes thevalve (2) in the direction to close the circuitbetween the ports P1 and P2. When thehydraulic oil enters the P1 port, the expression(P1 pressure Spring (7) force + ( d area x PRpressure)) holds, and the self pressure reducingvalve will adjust the openings of the ports P1 andP2 so that the P1 pressure can be maintainedhigher than the PR pressure.

• When the PR pressure rises above the set pres-sure, the poppet (5) will open and the hydraulicoil flows through the route from the PR port, thehole a in the spool (8), the poppet (5) opening tothe tank port T.

• Therefore, there will occur a differential pressurearound the hold a in the spool (8) and the spoolwill move in the direction to close the port P1 andthe PR opening. Then, the P1 pressure isreduced and adjusted to a certain pressure (setpressure) with the opening and is supplied as thePR pressure.


10-84 PC130-7


3. At raise of load pressure P2

OPERATION • When the load pressure P2 rises due to digging

or other operations, the pump delivery willincrease and the P1 pressure will rise. Then, the expression (P1 pressure > Spring (7)force + ( d area x PR pressure)) will hold, andthe valve (2) will move to the right side till thestroke end. As a result, the opening betweenthe ports P1 and P2 will increase, the passageresistance will become smaller to reduce engineloss horsepower.

• When the PR pressure rises above the set pres-sure, the poppet (5) will open and the hydraulicoil will flow through the route from the PR port,the hole a in the spool (8), the poppet (5) open-ing to the tank port T.

• Therefore, there will occur a differential pressurearound the hold a in the spool (8) and the spoolwill move in the direction to close the port P1 andthe PR opening. Then, the P1 pressure isreduced and adjusted to a certain pressure (setpressure) with the opening and is supplied as thePR pressure.


PC130-7 10-85


4. At occurrence of abnormal high pressure

OPERATION• When the PR pressure of the self pressure

reducing valve rises abnormally high, the ball(10) will separate from the seat against thespring (9) force to flow the hydraulic oil to theoutput ports PR o T so as to reduce the PRpressure. Then, the equipment (PPC valve,solenoid valve, etc.), to which the oil pressure issupplied, is protected from the abnormal highpressure.


10-86 PC130-7


CENTER SWIVEL JOINT

1. Cover2. Body3. Slipper seal4. O-ring5. Shaft

A1 : From control valve (R.H. travel Forward)A2 : To R.H. travel motor BB1 : From control valve (L.H. travel Forward)B2 : To L.H. travel motor AC1 : From control valve (R.H. travel Reverse)C2 : To R.H. travel motor AD1 : From control valve (L.H. travel Reverse)D2 : To L.H. travel motor BE1 : 2-stage travel selection solenoid valveE2 : To L.H./R.H. travel motor DDR1 : To hydraulic tankDR2 : From L.H. travel motor C1 and R.H. travel

motor C2

CENTER SWIVEL JOINT

PC130-7 10-87


TRAVEL MOTOR (FINAL DRIVE)

A : From control valve (L.H./R.H. travel)B : From control valve (L.H./R.H. travel)C1 : To hydraulic tank (L.H. travel motor)

Plug (R.H. travel motor)C2 : Plug (L.H. travel motor)

To hydraulic tank (R.H. travel motor)D : From travel 2nd speed selector solenoid valve

TRAVEL MOTOR

10-88 PC130-7


1. Plug 2. Check valve spring 3. Check valve 4. Return spring 5. Counterbalance valve 6. Safety valve 7. Safety valve spring 8. End cover 9. Regulator valve10. Spring11. Brake piston12. Cylinder13. Spring14. Swash plate15. Pivot16. Crankshaft17. RV gear A

18. RV gear B19. Cover20. Driven gear21. Drive gear22. Drain plug23. Hub24. Regulator piston25. Spindle26. Piston27. Floating seal28. Plate29. Disc30. Valve plate31. Spring32. Piston33. Plug34. Check valve

TRAVEL MOTOR

PC130-7 10-89


SPECIFICATION

OUTLINETravel speed selection

• Swash plate (14) has 2 faces (x, y) behind it, andis supported by pivot(15).

• When pressure of comtrol chamber a rises, itpushes regulator piston (24), them swash plateangle becomes minimum, then travel speedgoes high.

Type GM18VL3

Theoretical delivery (cm3/rev{cc/rev})

Hi 33.2 {33.2}

Lo 52.7 {52.7}

Rated speed (rpm)Hi 3,562

Lo 2,291

Brake releasing pressure(MPa{kg/cm2})

0.68{6.94}

Hi-Lo switching pressure(MPa{kg/cm2})

2.94{30}

Final drive reduction ratio 66

TRAVEL MOTOR

10-90 PC130-7


OPERATIONOperation of motorAt slow speed (the motor swash plate angle is maximized.)

• Since the travel 2nd speed selector solenoidvalve is demagnetized, the pressurized oil fromthe main pump does not flow to the D port.

• Therefore, the spring (10) has pressed the regu-lator valve (9) to the left side.

• So, the regulator valve (9) stops the main pres-surized oil led from the control valve to the endcover by pushing the check valve (34).

• The pressurized oil in the control chamber drainsin the motor case through the passage b of theregulator valve (9).

• Then, the main pressurized oil from the cylinderc chamber pushes the swash plate (14) in thedirection to maximize the swash plate angle andthe motor capacity is increased to the maximumfor slow speed travel.

TRAVEL MOTOR

PC130-7 10-91


At high speed (the motor swash plate angle is minimized.)

• When the travel 2nd speed selector solenoidvalve is energized, the pilot pressure from themain pump will flow in the D port and push theregulator valve (9) in the right direction.

• Therefore, the main pressurized oil from the con-trol valve passes through the passage b of theregulator valve (9), flows in the control chambera and pushed the regulator piston (24) in the leftdirection.

• Then, the swash plate (14) is pressed in thedirection to minimize the swash plate angle, andthe motor capacity is minimized for high speedtravel.

TRAVEL MOTOR

10-92 PC130-7


Operation of brake valve• The brake valve consists of the check valves

(3a) and (3b), the counterbalance valve (5) andthe safety valve (6), and the circuit configurationis as per the right figure.

• Functions and operations of these componentsare as follows :

Counterbalance valve, check valveFunction• When traveling down a slope, the own weight

falling force will make the machine travel fasterthan the motor rotation. So, traveling withreduced engine speed is very dangerousbecause the motor idles and runs away.These valves let the machine travel at a speedappropriate for the engine speed (pump delivery)to prevent this danger.

Operation at oil supply• When the travel lever is operated, the pressur-

ized oil from the control valve will be supplied tothe PA port, push and open the check valve (3a)and flow from the MA port on the motor inlet sideto the MB port on the motor outlet side.Since the motor outlet circuit is closed with thecheck valve (3b) and the counterbalance valve(5), however, the supply-side pressure will rise.

TRAVEL MOTOR

PC130-7 10-93


• The pressurized oil on the supply side flows inthe S1 chamber from the orifice E1 of the coun-terbalance valve (5). When the pressure in theS1 chamber rises above the switching pressureof the counterbalance valve, the counterbalancevalve (5) will be pressed in the right direction.So, the circuit between the outlet side MB portand the PB port will open, the motor outlet circuitwill open, and the motor will start rotating.

Brake operation at traveling downhill• If the machine is going to run away when travel-

ing downhill, the motor will idle to reduce the oilpressure on the motor inlet side and the pres-sure in the S1 chamber through the orifice E1.When the pressure in the S1 chamber dropsbelow the switching pressure of the counterbal-ance valve, the counterbalance valve (5) will bereturned in the left direction with the return spring(4), and the outlet side MB port will be throttled.Then, the pressure on the outlet side will rise androtation resistance will occur to the motor to pre-vent the machine from running away.This means that the counterbalance valve (5)moves to a position where the machine ownweight and the inlet side pressure balance withthe pressure at the outlet side MB port, and theoutlet circuit is throttled to control the speed tothe pump delivery.

TRAVEL MOTOR

10-94 PC130-7


Safety valveFunction• When stopping a travel (or traveling downhill),

the counterbalance valve (5) will close the inletand outlet circuits of the motor. Since the motorkeeps rotating by inertia, however, the pressureon the outlet side of the motor will rise abnor-mally and the motor and pipes may be damaged.Then, the safety valve leads the abnormally highpressure to the inlet side of the motor to preventthe equipment from being damaged.

Operation• When the pressurized oil being supplied from the

PA port is stopped flowing at the time of travelstop, the return spring (4) will return the counter-balance valve (5) from the right side to the leftside (the neutral position).

• Though the counterbalance valve (5) closes thea chamber on the outlet side circuit, the inertialets the motor rotate and the pressure in the achamber rises.

• The highly pressurized oil in the a chamberpasses through the throttle b of the safety valve(6a) and enters in the d chamber from the cchamber. The pressurized oil entered in the dchamber moves the piston (32) to the left side.Meantime, the safety valve (6a) is pushed toopen by the pressurized oil in the a chamber,and the pressurized oil in the a chamber flows inthe f chamber through the e port. Therefore, thepressurized oil in the a chamber flows in the fchamber at a comparatively slow speed to con-trol the pressure in the a chamber and also toprevent cavitation in the f chamber at the sametime.

• When the piston (32) reaches the stroke end, thepressures in the d and c chambers will rise, thesafety valve (6a) will be closed again and thepressure in the a chamber will rise further.

• Then, the safety valve (6b) will open and thepressurized oil in the a chamber will flow in the fchamber from the g chamber. The pressure inthe a chamber can be controlled in two stage asmentioned above, and the hydraulic motor canbe smoothly braked to stop.

TRAVEL MOTOR

PC130-7 10-95


Operation of parking brakeWhen operating travel• When the travel lever is operated, the pressur-

ized oil from the pump will work on the counter-balance valve (5), open the circuit a to theparking brake and flow in the b chamber of thebrake piston (11).

• The pressure in the b chamber overcomes thespring (31) and pushed the brake piston (11) inthe left direction.

• This will eliminate the press force to the plate(28) and the disc (29), and the plate (28) and thedisc (29) will separate, and the brake force willbe released.

When positioning travel neutral• When the travel lever is brought to the neutral

position, the counterbalance valve (5) will returnto the neutral position and the circuit a to theparking brake will be closed.

• The pressurized oil in the b chamber of the brakepiston (11) will be drained in the case, and thespring (31) will push the brake piston in the rightdirection.

• Therefore, the plate (28) and the disc (19) will bepushed to each other, and the brake will come towork.

TRAVEL MOTOR

10-96 PC130-7


SWING MOTOR

TYPE : KMF40ABE-3

B : From swing brake solenoid valveS : From control valveT : To tankMA : From control valveMB : From control valve

SPECIFICATIONType : KMF40ABE-3Theoretical delivery : 40.2 cc/revSafety valve set pressure : 27.5 MPa {280 kg/cm2}Rated speed : 2,413 rpmBrake releasing pressure :1.77 MPa{18.0 kg/cm2}

SWING MOTOR

PC130-7 10-97


1. Drive shaft 2. Spacer 3. Case 4. Disc 5. Plate 6. Brake ring 7. Brake piston 8. Housing 9. Reverse prevention valve10. Center spring

11. Cylinder12. Valve plate13. Piston14. Center shaft15. Safety valve16. Check valve17. Check valve spring18. Shuttle valve19. Shuttle valve spring20. Brake spring

SWING MOTOR

10-98 PC130-7


SWING BRAKE1. When solenoid valve is demagnetizedOperation• When the solenoid valve of the swing brake is

demagnetized, the pressurized oil from the con-trol pump will be interrupted and the B port willbe connected to the tank circuit.

• Then, the brake piston (7) will be pressed down-ward with the brake spring (8) and will push thedisc (4) and the plate (5) to work the brake.

2. When solenoid valve is energizedOperation• When the solenoid valve of the swing brake is

energized, the valve will be changed over andthe pressurized oil from the control pump willenter the B port and will flow in the brake cham-ber A.

• The pressurized oil in the A chamber will pushthe brake spring (8) and the brake piston (7) willmove upward. Then, the disc (4) and the plate(5) will separate to release the brake.

SWING MOTOR

PC130-7 10-99


REVERSE PREVENTION VALVE

1. Valve body2. Spool (MA side)3. Spring (MA side)4. Plug (MA side)5. Spool (MB side)6. Spring (MB side)7. Plug (MB side)

MA : PortMB : PortT1 : PortT2 : Port

SWING MOTOR

10-100 PC130-7


Effect explanation drawing

SWING MOTOR

PC130-7 10-101


FUNCTION• This function is used for reducing swing back

generated on a swing body that can result fromfactors such as inertia of the swing body, back-lash and rigidity of the machinery system andcompressibility of hydraulic oil.

• This function helps preventing loose loads at theend of swing or cutting lead time (better position-ing performance allows you to proceed to thenext operation within a shorter time).

1. When MB port pressure is generatedOperation• MB pressure is conducted to d room via the cut-

out. Utilizing difference of space (D1>D2), thepressure compresses the spring (6) and drivesthe spool (5) leftward to interconnect MB o e.

• Since MA pressure at this time is lower than thepressure set on the spring (3), the spool (2) isnot moved and pressurized oil remains closed.Thus, the braking force is maintained.

2. When the motor is once stoppedOperation• The motor is reverse rotated by charging pres-

sure generated on the MB port (1st reverse rota-tion).

• At this time, reversing pressure is generated onthe MA port. MA pressure conducted to a roominterconnects MA o b by compressing thespring (3) and driving the spool (2) rightward.

• The pressure is then conducted through drilledhole on the spool (5) to interconnect b o f.Reversing pressure on the MA port is bypassedto the T port to disable the 2nd reverse rotation.

SWING MOTOR

10-102 PC130-7


SOLENOID VALVE

FOR PPC LOCK, 2ND TRAVEL SPEED SELECT, SWING HOLD BRAKE AND 2-STAGERELIEF SOLENOID VALVE.

1. PPC lock solenoid valve 2. 2nd travel speed select solenoid valve 3. Swing hold brake solenoid valve 4. 2-stage relief solenoid valve

Solenoid valve 5. Push pin 6. Coil 7. Gauge 8. Spool 9. Block10. Spring

Check valve11. Plug12. Spring13. Plunger

A1 : To PPC valveA2 : To 2-stage relief valveA3 : To swing hold brakeA4 : To 2nd travel speed select valveACC : To accumulatorP1 : From self-pressure reducing valveT : To hydraulic oil tank

SOLENOID VALVE

PC130-7 10-103


OPERATIONWhen solenoid is "demagnetized"• The coil (6) remains demagnetized as long as

signal current to it is stopped..• Thus, the spool (8) is pushed leftward by the

spring (10).• Since ports P to A are closed by this spool, flow

of pilot oil pressure to the actuator is blocked. Atthe same time, oil from the actuator is lead fromA port to T port, then drained to the hydraulic oiltank.

When solenoid is "magnetized"• The coil (6) is magnetized by signal current con-

ducted to it.• Thus, the spool (8) is pushed rightward by the

push pin (5).• As the result, pilot oil pressure is conducted from

P port through the cage (7) and A port up theactuator.At the same time, T port is closed, thereby block-ing flow of oil to the hydraulic oil tank.

SOLENOID VALVE

10-104 PC130-7


PPC ACCUMULATOR

1. Gas plug2. Shell3. Poppet4. Holder5. Bladder6. Oil port

SPECIFICATIONSGas used : Nitrogen gasGas capacity : 0.3 lCharged gas pressure :

1.18 MPa (12 kg/cm2) at 80°CMaximum operating pressure :

6.86 MPa (70 kg/cm2)

PPC ACCUMULATOR

PC130-7 10-105


PPC VALVE

FOR SWING, WORK EQUIPMENT

P : From main pumpP1 : Left : Arm OUT/Right : Boom LOWERP2 : Left : Arm IN/Right : Boom RAISE

P3 : Left : Swing RIGHT/Right : Bucket CURLP4 : Left : Swing LEFT/Right : Bucket DUMPT : To tank

PPC VALVE

10-106 PC130-7


1. Spool 2. Metering spring 3. Centering spring 4. Piston 5. Disk

6. Nut (for linking the lever) 7. Joint 8. Plate 9. Retainer10. Body

PPC VALVE

PC130-7 10-107


OPERATION1) At neutral• Ports A and B of the control valve and ports P1

and P2 of the PPC valve are connected to drainchamber D through fine control hole f in spool(1). (Fig. 1)

2) During fine control (neutral o fine control)When piston (4) starts to be pushed by disc (5),retainer (9) is pushed; spool (1) is also pushedby metering spring (2), and moves down.When this happens, fine control hole f is shut offfrom drain chamber D, and at almost the sametime, it is connected to pump pressure chamberPP, so pilot pressure oil from the main pumppasses through fine control hole f and goes fromport P1 to port A.When the pressure at port P1 becomes higher,spool (1) is pushed back and fine control hole f isshut off from pump pressure chamber PP. Atalmost the same time, it is connected to drainchamber D to release the pressure at port P1.When this happens, spool (1) moves up or downso that force of metering spring (2) is balancedwith the pressure at port P1. The relationship inthe position of spool (1) and body (10) (fine con-trol hole f is at a point midway between drainhole D and pump pressure chamber PP) doesnot change until retainer (9) contacts spool (1).Therefore, metering spring (2) is compressedproportionally to the amount of movement of thecontrol lever, so the pressure at port P1 alsorises in proportion to the travel of the controllever. In this way, the control valve spool movesto a position where the pressure in chamber A(the same as the pressure at port P1) and theforce of the control valve spool return spring arebalanced. (Fig. 2)

PPC VALVE

10-108 PC130-7


3) During fine control (when control lever isreturned)When disc (5) starts to be returned, spool (1) ispushed up by the force of centering spring (3)and the pressure at port P1.When this happens, fine control hole f is con-nected to drain chamber D and the pressure oilat port P1 is released.If the pressure at port P1 drops too far, spool (1)is pushed down by metering spring (2), and finecontrol hole f is shut off from drain chamber D. Atalmost the same time, it is connected to pumppressure chamber PP, and the pump pressure issupplied until the pressure at port P1 recovers toa pressure that corresponds to the lever position.When the spool of the control valve returns, oil indrain chamber D flows fine control hole f' in thevalve on the side that is not working. The oilpasses through port P2 and enters chamber B tofill the chamber with oil. (Fig. 3)

4) At full strokeWhen disc (5) pushes down piston (4), andretainer (9) pushes down spool (1), fine controlhole f is shut off from drain chamber D, and isconnected with pump pressure chamber PP.Therefore, the pilot pressure oil from the mainpump passes through fine control hole f andflows to chamber A from port P1, and pushes thecontrol valve spool.The oil returning from chamber B passes fromport P2 through fine control hole f' and flows todrain chamber D. (Fig. 4)

PPC VALVE

PC130-7 10-109


FOR TRAVEL

P : From main pumpT : To tankP1 : L.H reverseP2 : L.H forward

P3 : R.H reverseP4 : R.H forwardP5 : Travel signal

PPC VALVE

10-110 PC130-7


1. Plate2. Body3. Piston4. Collar

5. Metering spring6. Centering spring7. Valve8. Pin

PPC VALVE

PC130-7 10-111


OPERATION1. In the neutral mode• P1 and P2 ports of the operation valves A, B and

PPC valve are connected to the drain room D viathe fine control hole f on the spool (1).

2. In the fine control mode(neutral o fine control)

• As the piston (4) is pushed by the disk (5), theretainer (9) is pushed, too. At the same time, thespool (1) is also pushed down via the meteringspring (2).

• By this move, connection of the fine control holef is switched from the drain room D to the pumppressure room PP, and pilot pressurized oil forthe main pump is conducted from P1 port to Aport.

• As P1 port pressure increases, the spool (1) ispushed back. By this move, connection of thefine control hole f is switched from the pumppressure room PP to the drain room D, therebyrelieving P1 port pressure.

• As the result, the spool (1) moves up and downso that force of the metering spring (2) and P1port pressure may be balanced.Positional relationship between the spool (1) andbody (10) (fine control hole f is situated at midpoint between the drain room D and pump pres-sure room PP) remains unchanged until theretainer (9) is contacted against the spool (1).

• The metering spring (2) is, therefore, com-pressed in proportion to strokes of the operationlever. Thus, the P1 port pressure, too, increasesin proportion to strokes of the operation lever.

• As the result, the operation valve spool moves tothe position where pressure of A room (the sameas P1 port pressure) is balanced against force ofthe operation valve spool return spring.

PPC VALVE

10-112 PC130-7


3. In the fine control mode (when operationlever is shifted back to its original position)

• As the disk (5) starts returning, the spool (1) ispushed up by force of the centering spring (3)and P1 port pressure.

• By this move, the fine control hole f is connectedto the drain room D and relieves pressurized oilof P1 port to it.

• If P1 port pressure goes excessively low, thespool (1) is pushed down by the metering spring(2) and passage between the fine control hole fand the drain room D is shut down. And, almostat the same time, the hole is connected to thepump pressure room PP and starts supplyingpump the pressure. This supply continues untilthe P1 port pressure is recovered to the levelequivalent to the lever position.

• When the operation valve spool returns, oil in thedrain room D flows in through the fine controlhole f' on the not moving side valve. Oil is thenconducted via P2 port to the room B to fill it up.

4. In the full stroke mode• When the disk (5) pushes down the piston (4)

and the retainer (9) pushes down the spool (1),connection of the fine control hole f is switchedfrom the drain room D to the pump pressureroom PP.

• Thus, pilot pressurized oil from the control pumppasses through the fine control hole f and con-ducted to A room via P1 port to push the opera-tion valve spool.

• Return oil from B room is conducted from P2 portto the drain room D via the fine control hole f'.

PPC VALVE

PC130-7 10-113


FOR SERVICE

1. Spool2. Metering spring3. Centering spring4. Piston5. Lever6. Plate7. Retainer8. Body9. Filter

P : From self pressure reducing valveT : To tankP1 : To blade or service valveP : To blade or service valve

PPC VALVE

10-114 PC130-7


OPERATION1. In the neutral mode• P1 and P2 ports of the operation valves A, B and

PPC valve are connected to the drain room D viathe fine control hole f on the spool (1).

2. In the fine control mode(Neutral o fine control)

• As the piston (4) is pushed by the disk (5), theretainer (7) is pushed, too. At the same time, thespool (1) is also pushed down via the meteringspring (2).

• By this move, connection of the fine control holef is switched from the drain room D to the pumppressure room PP, and pilot pressurized oil forthe control pump is conducted from P1 port to Aport.

• As P1 port pressure increases, the spool (1) ispushed back. By this move, connection of thefine control hole f is switched from the pumppressure room PP to the drain room D, therebyrelieving P1 port pressure.

• As the result, the spool (1) moves up and downso that force of the metering spring (2) and P1port pressure may be balanced.

• Positional relationship between the spool (1) andbody (8) (fine control hole f is situated at midpoint between the drain room D and pump pres-sure room PP) remains unchanged until theretainer (7) is contacted against the spool (1).

• The metering spring (2) is, therefore, com-pressed in proportion to strokes of the operationlever. Thus, the P1 port pressure, too, increasesin proportion to strokes of the operation lever.

• As the result, the operation valve spool moves tothe position where pressure of A room (the sameas P1 port pressure) is balanced against force ofthe operation valve spool return spring.

PPC VALVE

PC130-7 10-115


3. In the fine control mode (when the operationlever is shifted back to its original position)

• As the lever (5) starts returning, the spool (1) ispushed up by force of the centering spring (3)and P1 port pressure. By this move, the finecontrol hole f is connected to the drain room Dand relieves pressurized oil of P1 port to it.

• If P1 port pressure goes excessively low, thespool (1) is pushed down by the metering spring(2) and passage between the fine control hole fand the drain room D is shut down. And, almostat the same time, the hole is connected to thepump pressure room PP and starts supplyingpump the pressure. This supply continues untilthe P1 port pressure is recovered to the levelequivalent to the lever position.

• When the operation valve spool returns, oil in thedrain room D flows in through the fine controlhole f' on the not moving side valve. Oil is thenconducted via P2 port to the room B to fill it up.

4. In the full stroke mode• When the disk (5) pushes down the piston (4)

and the retainer (7) pushes down the spool (1),connection of the fine control hole f is switchedfrom the drain room D to the pump pressureroom PP.

• Thus, pilot pressurized oil from the control pumppasses through the fine control hole f and con-ducted to A room via P1 port to push the opera-tion valve spool.

• Return oil from B room is conducted from P2 portto the drain room D via the fine control hole f'.

PPC VALVE

10-116 PC130-7


WORK EQUIPMENT

1. Bucket2. Link 3. Bucket cylinder4. Arm 5. Arm cylinder6. Boom 7. Boom cylinder

WORK EQUIPMENT

PC130-7 10-117


AIR CONDITIONER PIPING

A : Hot air/cold air spurting portB : Internal air circulation portC : External air inletD : Refrigerant checking port

1. Hot water inport piping2. Air conditioner compressor3. Condenser4. Refrigerant piping

5. Receiver tank 6. Hot water return piping7. Air conditioner unit8. Duct

AIR CONDITIONER PIPING

10-118 PC130-7


ENGINE CONTROL

1. Starting switch2. Fuel control dial3. Governor motor4. Starting motor5. Linkage6. Battery relay7. Battery8. Engine throttle and pump controller9. Fuel injection pump

OUTLINE• The engine can be started and stopped with only

starting switch (1).• The engine throttle and pump controller(8) rev-

eives the signal of fuel control dial (2) and trans-mits the drive signal to governor motor (3) tocontrol the governor lever angle of fuel injectionpump (9) and control the engine speed.

ENGINE CONTROL

PC130-7 10-119


1. OPERATION OF SYSTEMStarting engine• When the starting switch is turned to the START

position, the starting signal flows to the startingmotor, and the starting motor turns to start theengine.

When this happens, the engine throttle andpump controller checks the signal from the fuelcontrol dial and sets the engine speed to thespeed set by the fuel control dial.

Engine speed control• The fuel control dial sends a signal to the engine

throttle and pump controller according to theposition of the dial. The engine throttle and pumpcontroller calculates the angle of the governormotor according to this signal, and sends a sig-nal to drive the governor motor so that it is at thatangle.

When this happens, the operating angle of thegovernor motor is detected by the potentiometer,and feedback is sent to the engine throttle andpump controller, so that it can observe the opera-tion of the governor motor.

Stopping engine• When the starting switch is turned to the STOP

position, the engine throttle and pump controllerdrives the governor motor so that the governorlever is set to the NO INJECTION position.

• When this happens, to maintain the electricpower in the system until the engine stops com-pletely, the engine throttle and pump controlleritself drives the battery relay.

ENGINE CONTROL

10-120 PC130-7


2. COMPONENTFuel control dial

FUNCTION• The fuel control dial is installed under the monitor

panel, and a potentiometer is installed under theknob. The potentiometer shaft is turned by turn-ing the knob.

• As the potentiometer shaft is turned, the resis-tance of the variable resistor in the potentiometerchanges and a throttle signal is sent to theengine throttle and pump controller.The hatched area in the graph shown at right isthe abnormality detection area.

ENGINE CONTROL

1. Knob2. Dial3. Spring4. Ball5. Potentiometer6. Connector

PC130-7 10-121


GOVERNOR MOTOR

1. Potentiometer2. Cover3. Shaft4. Dust seal5. Bearing6. Motor7. Gear8. Connector

FUNCTION• The motor is turned according to the drive signal

from the engine throttle and pump controller tocontrol the governor lever of the fuel injectionpump.

This motor used as the motive power source is astepping motor.

• A potentiometer for feedback is installed to moni-tor the operation of the motor.

• Revolution of the motor is transmitted throughthe gear to the potentiometer.

OPERATIONWhile motor is stopped• Electric power is applied to both phases A and B

of the motor.

While motor is running• The engine throttle and pump controller supplies

a pulse current to phases A and B, and the motorrevolves, synchronizing to the pulse.

ENGINE CONTROL

10-122 PC130-7


ELECTRIC CONTROL SYSTEM

CONTROL FUNCTION

1

Engine/Pump composite control function

2

Pump/Valve control function

3

One-touch power maximizing function

4

Auto-deceleration function

5

Auto-warm-up/Overheat prevention function

Swing control function

6

7

Travel control function

8

ATT flow control, circuit selector function (if equipped)

Self-diagnosis function

Electric control system


10-124 PC130-7


MACHINE CONTROL SYSTEM DIAGRAM


PC130-7 10-125

STRUCTURE AND FUNCTION ELECTRIC CONTROL SYSTEM

10-126 PC130-7


1. ENGINE AND PUMP CONTROL FUNCTION


PC130-7 10-127


FUNCTION• This function is for selecting any of the three

working modes "A," "B", "E" and "L" with theworking mode selector switch on the monitorpanel. The controller can select optimumengine torques or pump absorption torques forworks to be expected.

• The controller detects the engine governorspeed set with the fuel control dial depending onthe pump absorption torque set in each modeand detects actual engine speeds. Then, thecontroller controls all torques at each outputpoint of the engine so that the pump can absorbthem.

• When an engine speed was lowered, the control-ler prevents the engine from stopping by throt-tling the pump absorption toque.


10-128 PC130-7


1. CONTROL METHOD IN EACH MODE

Mode A• Matching point in Mode A• When a load to the pump increases and the

pressure rises and the engine speed lowers.At the time, the controller reduces the pumpdelivery so that the speed lowers to the speed atthe full output point or so. If the pressure dropson the contrary, the controller increases thepump delivery so that the speed comes to thespeed at the full output point or so.

The controller repeats these controls so that theengine can always be used at speeds at the fulloutput point or so.

A Travel (A1) 66.2 kW/2,200 rpm{88.7 HP/2,200 rpm}

A Work (A2) 65.5 kW/2,200 rpm{87.8 HP/2,200 rpm}


PC130-7 10-129


Mode E / Mode B / Mode L

• At this time, the controller keeps the pumpabsorption torque along the constant horse-power curve and lower the engine speed bythe composite control of the engine andpump.

• By this method, the engine is used in the lowfuel consumption area.

Mode E B L

Partial output point 90% 90% 56%

Model PC130-7

Mode E 58.8 kW/2,000 rpm {78.9 HP/2,000 rpm}

Mode B 58.8 kW/2,000 rpm {78.9 HP/2,000 rpm}

Mode L 36.8 kW/1,500 rpm {70 HP/1,500 rtpm}


10-130 PC130-7


2. FUNCTION TO CONTROL PUMP DURINGTRAVEL

• If the machine travels in mode work A, B, E, or L,the working mode does not change, but thepump absorption torque and engine speed riseto travel A mode.

3. PUMP DRIVE IN AN EMERGENCY• Even if controllers and sensors get out of order,

the emergency pump drive switch (S) will enableto maintain functions of the machine with absorp-tion torques quite similar to those in the Mode E.

In this case, a constant current flows from thebattery to the PC-EPC valve, and the valvedetects the oil pressure only.

(1) Normal

(2) Emergency

a The emergency pump drive switch (S) is of thealternative type. If the machine is operated afterthe switch is set to "Emergency (2)" even thoughthe machine is normal, the user code "E02" willbe shown on the display.


PC130-7 10-131


2. PUMP/VALVE CONTROL FUNCTION

FUNCTION• The machine is matched to various types of work

properly with the 2-stage relief function toincrease the digging force, etc.


10-132 PC130-7


1) Cut-off function• When the cut-off function is turned on, the

PC-EPC current is increased to near themaximum value.By this operation, the flow rate in the reliefstate is lowered to reduce fuel consumption.

• Operating condition for turning on cut-offfunction.

The cut-off function does not work, however,while the machine is traveling in mode A, thelock switch is turned on.

2) 2-stage relief function• The relief pressure in the normal work is 31.9

MPa {325 kg/cm2}. If the 2-stage relief func-tion is turned on, however, the relief pressurerises to about 34.8 MPa {355 kg/cm2}.By this operation, the hydraulic force isincreased further.

• Operating condition for turning on 2-stagerelief function

Condition

• The average value of the front and rear pres-sure sensors is above 27.9 MPa {285 kg/cm2}and the one-touch power maximizing function isnot turned on

Condition Relief pressure

• During travel• When swing lock switch is

turned on• When one-touch power maxi-

mizing function is turned on• When L mode is operated

31.9 MPa{325 kg/cm2}

⇓34.8 MPa

{355 kg/cm2}


PC130-7 10-133


3. ONE-TOUCH POWER MAXIMIZING FUNCTION

FUNCTION• Power can be increased for about 8.5 sec. by

operating the left knob switch.


10-134 PC130-7


1) One-touch power maximizing function• When the operator needs more digging force

to dig up a large rock, etc., if the left knobswitch is pressed, the hydraulic force isincreased about 9% to increase the diggingforce.

• If the left knob switch is turned on in workingmode "A" or "E", each function is set auto-matically as shown below.

⇓

Software cut-off function

Working mode

Engine/Pump control

2-stage relief function Operation time

A, EMatching at rated output point

31.9 MPa {325 kg/cm2}⇓

34.8 MPa {355 kg/cm2}

Automatically reset at 8.5 sec

Cancel


PC130-7 10-135


4. AUTO-DECELERATION FUNCTION

FUNCTION• If the all control levers are set in NEUTRAL while

waiting for a dump truck or work, the enginespeed is lowered to the medium level automati-cally to reduce the fuel consumption and noise.

• If any lever is operated, the engine speed risesto the set level instantly.


10-136 PC130-7


OPERATIONWhen control levers are set in neutral• If all the control levers are set in NEUTRAL while

the engine speed is above the decelerator oper-ation level (about 1,400 rpm), the engine speedlowers instantly to the first deceleration levelabout 100 rpm lower than the set speed.

• If 4 more seconds pass, the engine speed lowersto the second deceleration level (about 1,400rpm) and keeps at that level until any lever isoperated again.

When any control lever is operated• If any control lever is operated while the engine

speed is kept at the second deceleration level,the engine speed rises instantly to the level setwith the fuel control dial.


PC130-7 10-137


5. AUTO-WARM-UP/OVERHEAT PREVENTION FUNCTION

FUNCTION• After the engine is started, if the engine cooling

water temperature is low, the engine speed israised automatically to warm up the engine. Ifthe engine cooling water temperature rises toohigh during work, the pump load is reduced toprevent overheating.


10-138 PC130-7


1) Auto-warm-up function• After the engine is started, if the engine cool-

ing water temperature is low, the enginespeed is raised automatically to warm up theengine.

Operating condition (All) Operated

Water temperature: Below 30°C.Engine speed: Max. 1,200 rpm ⇒ Engine speed: Max. 1,200 rpm

⇓Resetting condition (Any one)

⇒

Reset

AutoWater temperature: Above 30°C

Engine speed: Any levelAuto-warm-up operation time: Min. 10 minutes

Manual Fuel control dial: Kept at 70% of full level for 3 sec. or longer

Operating condition Operation/Remedy Resetting condition

Water and oil temper-ature: Above 105°C ⇒

Work mode: Any modeEngine speed: Low idleMonitor alarm lamp: Lights upAlarm buzzer: Sounds

⇒

Water and oil temperature: Below105?CFuel control dial: Return to lowidle position once.• Under above condition, control-

ler is set to condition beforeoperation of function. (Manualreset)



Work mode: Mode A, E, OR BEngine speed: Keep as is.Monitor alarm lamp: Lights up.Lower pump discharge.

⇒

Water and oil temperature: Below102°C• Under above condition, control-

ler is set to condition beforeoperation of function. (Auto-matic reset)



Work mode: Mode AEngine speed: Keep as is.Lower pump discharge.

⇒Water and oil temperature:Below 98°C• Under above condition, control-




Work mode: TravelEngine speed: Keep as is.Lower travel speed.

⇒Water and oil temperature:Below 95°C• Under above condition, control-



PC130-7 10-139


6. SWING CONTROL FUNCTION

1. Battery 2. Battery relay 3. Fusible link 4. Starting switch 5. Fuse box 6. Controller 7. Swing holding brake release switch 8. Swing lock switch 9. Monitor panel10. Swing holding brake solenoid valve

11. PPC lock solenoid valve12. Swing motor13. L.H. work equipment PPC valve14. Arm IN PPC oil pressure switch15. Swing PPC oil pressure switch16. Engine17. Hydraulic pump18. Control valve

18a. Self pressure reducing valve18b. Main relief valve

Input/Output Signalsa. Controller power supplyb. Solenoid power supplyc. Monitor panel power supplyd. S-NET signal

e. Solenoid valve drive signalf. Swing PPC oil pressure switch signalg. Arm IN PPC oil pressure switch signal


10-140 PC130-7


FUNCTIONSwing lock and swing holding brake• The swing lock (manual type) is for locking swing

at optional positions. The swing holding brake(automatic type) interlocks with swing and pre-vents hydraulic drift from occurring after stop ofswing.

a When the swing lock is released, only thehydraulic brake with the safety valve is effectivefor swing. So, note that, when a swing stops ona slope, a hydraulic drift may occur sometimes.

a Even during arm IN operation, release the swingholding brake.

Release of swing holding brake• If the controller gets out of order and no swing is

possible because the swing holding brake doesnot work normally, use the swing holding brakerelease switch (S), and the swing holding brakewill be released and swing will become possible.

(1) Normal (2) Release

a Even if the swing holding brake release switch isset to "ON," the swing holding brake is not bereleased while the swing lock switch is set to"ON."

Input/Output signal time chart

Swinglock

switch

Swinglock

monitorFunction Operation

OFFThe lamp goes OUT.

Swing holdingbrake

• When the swing con-trol lever is set toNEUTRAL, the swingholding brake works 4sec. later.

• When the swing con-trol lever or the arm INlever is operated, theswing holding brake isreleased and freeswing becomes possi-ble.

ON The lamp turns ON.

Swinglock

• The swing holding brakeworks, and the swing islocked.

• Even if the swing con-trol lever is operated,the swing holding brakecannot be released,and no swing is possi-ble.

Swingholding brake release switch

ON(when the controller is out of order)

OFF(when the controller is in order)

Swing lockswitch ON OFF ON OFF

Swing brake

The swing lock works.

The swing lock is released.

The swing lock works.

The swing holding brake works.


PC130-7 10-141


7. TRAVEL CONTROL FUNCTION

1. Battery 2. Battery relay 3. Fusible link 4. Starting switch 5. Fuse box 6. Controller 7. Monitor panel 8. Travel speed selector solenoid valve 9. L.H. travel motor

10. R.H. travel motor11. Engine speed sensor12. Pump pressure sensor13. Engine14. Hydraulic pump15. Control valve 15a. Self pressure reducing valve 15b. Main relief valve

Input/Output signalsa. Controller power supplyb. Solenoid power supplyc. Monitor panel power supplyd. S-NET signal

e. Solenoid valve drive signalf. Engine speed signalg. Pump pressure signal


10-142 PC130-7


FUNCTIONTravel Speed Selection1. Travel Speed "Manual" Change

• When the travel speed selector switch is setto LOW or HIGH, the motor capacitychanges and travel speeds can be selected.

2. "Automatic"change of travel speed 1) Automatic selection corresponding to engine

speed • If engine speed drops to 1,500 rpm or

less when travel speed selector switch isin HIGH and travel speed is HIGH, travelspeed changes to LOW automatically.

• If engine speed becomes 1,700 rpm orless when travel speed selector switch isin HIGH and travel speed is LOW, travelspeed changes to HIGH automatically.

a If travel speed selector switch is in LOW,travel speed is not changed automati-cally.

2) Automatic selection corresponding to dis-charge pressure of pump • If travel pressure of 30.4MPa {310 kg/

cm2} or higher continues for 0.2 secondsor more when travel speed selectorswitch is in HIGH, travel speed changesto LOW automatically.

• If travel pressure of 16.7MPa {170 kg/cm2} or lower continues for 0.2 secondsor more when travel speed selectorswitch is in HIGH, travel speed changesto HIGH automatically.

a If travel speed selector switch is in LOW,travel speed is not changed automati-cally.

Travel speed selector switch

LOW(low speed)

HIGH(high speed)

Motor capacity (cc/rev) 52.7 33.2

Travel speed (km/h) 2.7 5.5

ravel motor swash plate angle Maximum Minimum


PC130-7 10-143


8. PPC LOCK FUNCTION

1. Battery 2. Battery relay 3. Fusible link 4. Starting switch 5. Fuse box 6. Controller 7. Safety lock lever 8. PPC lock switch 9. PPC lock solenoid valve

10. Left work equipment PPC valve11. Right work equipment PPC valve12. Traveling PPC valve13. Blade PPC valve (Blade specification)14. Engine15. Hydraulic pump16. Operation valve

16a. Self pressure reducing valve16b. Man relief valve

Input/Output signalsa. Power supply of controllerb. Power supply of solenoidsc. Solenoid valve driving signals

Function• PPC lock switch works with safety lock lever.

Setting safety lock lever to "Lock", PPC lockswitch turns to "OFF".

• Turning PPC lock switch to "OFF" shuts off cur-rent to PPC lock solenoid valve, making opera-tion lever on the work equipment disabled.


10-144 PC130-7


SELF DIAGNOSIS FUNCTION1. Error code display/Alarm functions

• Controller always watches electronic deviceswhich constitutes the system, including con-troller itself, each potentiometer which issuesinput signals, each solenoid valve whichreceives output signals, and EPC valves, tocheck for they normal operation.

• If an abnormality occurred in any of thesedevices, the controller diagnoses it and dis-play the results on display (1) of monitorpanel as a "USER CODE" or "SERVICECODE", sounding alarm buzzer at the sametime to notify the abnormality to operator.

a Refer to the "TROUBLESHOOTING" sec-tion as for the details of display and mea-sures to be taken.

2. Error code memory function• Controller takes in memory the error code

diagnosed about an abnormality whichoccurred in advanced system.

a Refer to the "TESTING AND ADJUSTING"section as for the details of display and howto reset.


PC130-7 10-145


SYSTEM COMPONENTS

ENGINE SPEED SENSOR

FUNCTION• The engine speed sensor is installed on the ring

gear of the engine flywheel. It electrically countsnumber of gear teeth that pass its front side andsends the counting to the controller.

Remarks : Number of ring gear teeth is 127.

• For the count, a magnet is used which generatescurrent every time a gear tooth passes its frontside.

1. Magnet2. Terminal3. Case4. Boots5. Connector


10-146 PC130-7


PPC HYDRAULIC SWITCH

SPECIFICATIONContact structre : Normally openedOperating (ON) pressure :

490 ± 98.1 kPa {5.0 ± 1.0 kg/cm2}Resetting (OFF) pressure :

294 ± 49.0 kPa {3.0 ± 0.5 kg/cm2}

FUNCTION• 8 switches installed to junction block sense oper-

ating condetion of each actuator, and send it tocontroller.

• 1 switch installed to travel PPC valve sensetravel operating condition, and send it to control-ler.

1. Plug2. Switch3. Connector


PC130-7 10-147


CONTROLLER


10-148 PC130-7


Input/output signals


CN-1 CN-2 CN-3

Pin No. Signal name Input/

output

1 NC Input

2 NC Input

3 NC Input

4 Signal GND —

5 NC Input

6 NC Input

7 Overload pressure sensor Input

8 Pump pressure sensor Input

9 NC Input

10 Signal GND —

11 Knob switch Input

12 NC Input

13 Feed back signal Input

14 NC Input

15 NC Input

16 SENS_PWR Output

17 Start switch (C) Input

18 NC Input

19 Fuel dial Input

20 NC Input

21 Analog GND —

22 POT_PWR Output

23 Start switch (Acc) Input

24 NC Input


output

1 NC Output

2 Swing prolix switch Input

3 NC Input

4 232C_RxD Input

5 NC Input

6 Over load caution enable switch Input

7 Machine select 4 Input

8 NC Output

9 NC Output

10 NC Input

11 NC Output

12 CAN shield —


14 232C_TxD Output

15 NC Input

16 NC Input


18 NC Output

19 NC Output

20 NC Input

21 S_NET Input/Output

22 CANO_L Input/Output

23 CAN1_L Input/Output

24 Flash memory write enable signal Input

25 NC Input

26 NC Input


28 NC Input

29 Puls GND —

30 NC Input

31 GND (S_NET GND) —

32 CAN0_H Input/Output

33 CAN1_H Input/Output

34 GND (232C GND) —

35 Service switch —

36 NC Input


38 Swing lock switch Input

39 Puls GND —

40 Eng. speed Input


output

1 Control power supply Input

2 Solenoid power supply Input

3 SOL_COM —

4 Battery relay drive Output

5 Motor drive a (+) Output

6 LS_EPC Output

7 NC Output

8 NC Output

9 Bucket curl switch Input

10 Boom ralse switch Input

11 Control power supply Input


13 SOL_COM —

14 Key signal Input

15 Motor drive a (-) Output

16 PC-EPC Output

17 NC Output

18 Heater relay solenoid Output

19 Bucket dump switch Input

20 Boom lower switch Input

21 GND —


23 SOL_COM —

24 Key signal Input

25 Motor drive b (+) Output

26 NC Output

27 Travel speed solenoid Output

28 2-stage rellef solenoid Output

29 Swing switch Input

30 Arm curl switch Input

31 GND —

32 GND —

33 GND —

34 NC

35 Motor drive b (-) Output

36 NC Output

37 Swing brake solenoid Output

38 NC Output

39 Travel switch Input

40 Arm dump switch Input

PC130-7 10-149


PUMP PRESSURE SENSOR

1. Plug2. Sensor3. Connector

FUNCTION• Mounted on the inlet circuit of control valve, this

sensor changes discharging pressure of pumpinto voltage, and send it to automatic travelspeed change controller.

Monitor panela Refer to the section describing the "Monitor Sys-

tem".

PC valveLS valvePC-EPC valvea Refer to the section describing the "Hydraulic

Pump (Piston pump)".LS-EPC valvea Refer to the section describing the "Hydraulic

Pump (Piston pump)".

PPC lock solenoid valve2nd speed select solenoid valveSwing hold brake solenoid valve2-stage relief solenoid valvea Refer to the section describing the "Solenoid

Valve".


10-150 PC130-7


MONITOR SYSTEM

1. Monitor panel2. Battery3. Controller4. Sensors and switches5. Wiper motor, window washer motor

Input/Output signalsa. Power supplyb. Switch signalc. Caution signald. Sensor/switch signale. Sensor/switch signalf. Output for driving

Description• The monitor system monitors conditions of the

machine with sensors mounted on its each sec-tion, processes promptly the informationobtained, and displays it on panel to let operatorknow the conditions of the machine.

MONITOR SYSTEM

PC130-7 10-151


MONITOR PANEL

OUTLINE• The monitor panel has the functions to display a

monitor, gauge, service meter and electric sys-tem. It has also an alarm buzzer built in.

• A CPU (Central Processing Unit) mounted insideprocesses, displays and outputs information.

• The monitor's switch section consists of three flattype sheet switches. Pressing any of these switches changes the conditions of the machine,which are shown by LEDs located above theswitches turned ON.

• The monitor does not give correct display if anyof the monitor panel unit, controller, or the wiringbetween monitor-panel and controller is in abnor-mal condition.

Input/Output signalsAMP070-12P [CN-P01] AMP040-20P [CN-P02]

Pin No. Signal name I/O signal

1 Starting switch (battery) Input

2 Starting switch (battery) Input

3 Window washer motor output Output

4 Starting switch (C-terminal) Input

5 Wiper W-contact Input

6 GND —

7 GND —

8 VB + (24V) Input

9 Wiper motor (+) Output

10 Wiper motor (–) Output

11 Alarm buzzer ON signal Input

12 Wiper P-contact Input

Pin No. Signal name I/O signal

1 Engine coolant temperature Input

2 Fuel level Input

3 Radiator coolant level Input

4 NC Input

5 Air cleaner clogging Input

6 NC Input

7 Engine oil pressure Input

8 Engine oil level Input

9 S-NET signal Input/Output

10 S-NET signal Input/Output

11 Battery charge level Input

12 Hydraulic oil level Input

13 GND (analog signal) —

14 NC —

15 Pull-up window limit switch Input

16 Alarm buzzer cancel Input

17 Swing lock Input

18 Preheating Input

19 Lamp switch Input

20 GND (S-NET) —

MONITOR SYSTEM

10-152 PC130-7


METER DISPLAY

[*1] As for display and operation, refer to the "Self Diagnosis Function" section.[*2] As for display and operation, refer to the "Troubleshooting" chapter.

No. Displaycategory Display item Display area Display method Display

color Remarks

1 Service meter 0 – 99999.9 hTime counting while engine is in operation (al-ternator is generating) (Always lit even if start-ing switch is OFF)

Blue LCD[*1]2 Display Alphanumerics in 2

digits

Count time during engine operates.Displays 2 digit alphanumerics (user code or service code) if electric control system is in ab-normal condition.

3a Gauge

Coolanttemperature

See picture above All the segments of the corresponding level and lower are turned ON. (Level 8 (102°C or higher):Monitor lamp blinks. Level 9: Monitor lamp blinks and alarm buzzer sounds.)

3b CautionSpecified tempera-ture (102°C) or higher

Red LED

4a GaugeFuel level

See picture above All the segments of the corresponding level and lower are turned on. (Level 1 (42 l or less): Monitor lamp blinks.)

Blue LCD

4b Caution Specified level(42 l) or lower Red LED

5

Pilot

Preheating During preheating

Turned on for about 30 seconds after starting switch was turned to "HEAT". It blinks (for about 10 seconds) after preheating was over to notify it to operator, and then it is turned off.

Green

Lamp

6 Swing lock When swing-lock is in operation

• Turned on when the swing lock function is ac-tive.

• Blinks when swing holding brake release switch was turn on.

[*2]7

Oilmaintenance

When specified oil-maintenance peri-ods elapsed

• Turned ON when specified oil maintenance periods (125h, 250, and 500h) elapsed. (Also, elapsed time and telephone No. of your deal-er are shown on service meter.)

• Not turned on if no oil maintenance period has been specified.

8

Caution

Engine oil level Max. low level

Red

9 Battery charge level

Charge in fault (charge voltage < battery voltage)

Turned ON when starting switch was turned on; turned off after engine started running.In normal condition : turned OFFIn abnormal condition : turned ON(As for engine oil pressure, charge and over load alarm buzzer sounds if the pressure be-came abnormal when engine was running.)

10 Air cleaner clogging At clogging

11 Engine oilpressure

Lower than the specified pressure 49 kPa {0.5 kg/cm2}

12 Over loadMin. specified pres-sure 16.7 MPa {170 kg/cm2}

MONITOR SYSTEM

PC130-7 10-153


MONITOR SWITCH

* You can change the default settings which become active when starting switch is turned on. Refer to the"TROUBLESHOOTING" chapter.

a Signs written in bold fonts in the "Operation" column above represent the positions switches default to whenstarting switched is turned on.

No. Name Function Operation

1 Travel speed selector switch

Used to select a travel speed from two of them. "Lo" is lit: Travel in low speed."Hi" is lit: Travel in high speed.<The speed is locked at Lo when arm crane is used.>

Lo Hi

2 Auto-deceleration switch

Activates the function to reduce fuel consumption.Turned ON: The function is active.Turned OFF: The function is not active.<The function is made inactive when arm crane is used.>

ON OFF(Lit)

3 Wiper switch

Activates wiper of front glass."ON" is lit: Wiper works continuously."INT" is lit: Wiper works intermittently. Not lit: Wiper is not working.

OFF INT ON (Not lit) (Intermittent) (Continuous)

4 Wind washer switch Sprays washer fluid onto front glass.

[When wiper is not working]ON : Washer fluid is sprayed

and wiper works continu-ously.

OFF : Wiper works twice and stops after the switch was released.

[When wiper is working intermit-tently]ON : Washer fluid is sprayed

and wiper works continu-ously.

OFF : Wiper works twice and re-turns to intermittent opera-tion after the switch was released.

*5

Operation mode selector switch

Sets the movement and force of the working equipment."A" is lit: A mode (for heavy duty work)"E" is lit: E mode (for fuel economical operation)"L" is lit: L mode (for fine control work)"B" is lit: B mode (for breaker work)

A E L B

MONITOR SYSTEM

10-154 PC130-7


SENSORS• Signal from a sensor is directly entered to the

panel.• There are two types of sensors, contact type and

resistance type.• One end of a contact type sensor is connected to

the ground on the machine body.

ENGINE OIL PRESSURE SENSOR

1. Plug2. Contact ring3. Contact

4. Diaphragm5. Spring 6. Terminal

COOLANT TEMPERATURE SENSORHYDRAULIC OIL TEMPERATURE SENSOR

1. Connector2. Plug3. Thermistor

Display class Sensor type Sensing approach When normal When failed

Caution Engine oil pressure Contact OFF (open) ON (closed)

Gauge

Coolant temperature Resistance — —

Fuel level Resistance — —

Hydraulic oil temperature Resistance — —

MONITOR SYSTEM

PC130-7 10-155


FUEL LEVEL SENSOR

1. Float2. Connector3. Cover4. Variable resisto

MONITOR SYSTEM

PC130-7 40-1

SWING MACHINERY .............................................................. 40- 2SWING CIRCLE ...................................................................... 40- 4TRACK FRAME, IDLER CUSHION......................................... 40- 5IDLER ...................................................................................... 40- 6CARRIER ROLLER ................................................................. 40- 7TRACK ROLLER ..................................................................... 40- 8SPROCKET ............................................................................. 40- 9TRACK SHOE ......................................................................... 40-10HYDRAULIC PUMP................................................................. 40-14CONTROL VALVE ................................................................... 40-15SUCTION SAFETY VALVE ..................................................... 40-24SELF PRESSURE REDUCTION VALVE ................................ 40-25TRAVEL MOTOR..................................................................... 40-26SWING MOTOR ...................................................................... 40-27SOLENOID VALVE .................................................................. 40-28CENTER SWIVEL JOINT ........................................................ 40-29PPC VALVE ............................................................................. 40-30HYDRAULIC CYLINDER......................................................... 40-34WORK EQUIPMENT ............................................................... 40-36DIMENSION OF WORK EQUIPMENT.................................... 40-38

40 MAINTENANCE STANDARD

40-2 PC130-7

MAINTENANCE STANDARD

SWING MACHINERY

SWING MACHINERY

PC130-7 40-3


Unit: mm

No. Check item Criteria Remedy

1 Backlash between swing motor shaft and No.1 sun gear.

Standard clearance Clearance limit

Replace

0.07 – 0.18 0.4

2 Backlash between No.1 sun gear and No.1 planetary gear. 0.13 – 0.31 0.6

3 Backlash between No.1 planetary gear and ring gear. 0.15 – 0.34 0.7

4Backlash between No.1 planetary carrier and No.2sun gear.

0.14 – 0.34 0.7

5 Backlash between No.2 sun gear and No.2 planetary gear. 0.13 – 0.31 0.6

6 Backlash between No.2 planetary gear and ring gear. 0.15 – 0.34 0.7

7 Backlash between No.2 planetary carrier and swing pinion. 0.08 – 0.19 0.4

8 Backlash between swing pinion and swing circle. 0.13 – 1.16 2.3

9 Wear of swing pinion surface con-tacting with oil seal.

Standard size Repair limit Apply hard-chrome plating recondition, or replace145 144.80

- 0.1000

SWING MACHINERY

40-4 PC130-7


SWING CIRCLE

Unit: mm


1 Axial clearance of bearingStandard clearance Clearance limit

Replace0.10 – 0.25 0.9

SWING CIRCLE

PC130-7 40-5


TRACK FRAME, IDLER CUSHION

Unit: mm


1 Idler guide top and bottom width

Standard size Clearance limitRebuild

Track frame 84 89

Idler support 82 77 Rebuild or replace

2 Idler guide left and right width

Track frame 185 193 Rebuild

Idler support 183 175 Rebuild or replace

3 Recoil spring

Standard size Repair limit

ReplaceFree length Installed length

Installedload Free length Installed

load

502 390 84.3 kN{8,600 kg} 490 75.0 kN

{7,650 kg}

TRACK FRAME, IDLER CUSHION

40-6 PC130-7


IDLER

Unit: mm


1 Outer diameter of protrudingportion


Rebuild orreplace

527 —

2 Outer diameter of tread 489 477

3 Depth of protruding portion 19 25

4 Width of protruding portion 52 42

5 Total width 115 107

6 Width of tread 31.5 36.5

7 Clearance between idler shaft and bushing

Standardsize

Tolerance Standard clearance

Clearance limit

Replace

Shaft Hole

54 – 0.250– 0.280

+ 0.0740

0.250 – 0.354 1.5

8 Interference between idlerand bushing

Standardsize

Tolerance Standard in-terference

Interference limitShaft Hole

61 + 0.117+ 0.087

+ 0.0300

0.057 – 0.117 —

9 Side clearance of idler(on one side)


0.18 – 0.38 1.5

10 Tread wall thickness(at center of tread)

Standard size Repair limitRebuild orreplace15 9

IDLER

PC130-7 40-7


CARRIER ROLLER

Unit: mm


1 Outer diameter of tread

Standard size Repair limitRebuild or replace116 106

2 Width of tread 123 — —

3 Clearance between shaft andbushing

Standardsize


Clearance limit

Replace

Shaft Hole

40 + 0.055– 0.035

+ 0.261+ 0.200

-0.145 – 0.226 —

4 Interference between collar and bushing

Standardsize



47 + 0.061– 0.036

+ 0.0250

0.011 – 0.061 —

5 Play on carrier roller inaxial direction


0.363 – 0.537 1.5

6 Tread wall thickness(at 10 mm away from end face roller) 17.7 12.7 Rebuild or

replace

CARRIER ROLLER

40-8 PC130-7


TRACK ROLLER

Unit: mm


1 Diameter of flange(outside)


Rebuild orreplace

158 —

2 Outer diameter of tread 130 120

3 Flange width 26.5 —

4 Total width 176 — —

5 Width of tread 35 — Rebuild orreplace

6 Clearance between shaft and bushing

Standardsize


Clearance limit

Replace

Shaft Hole

48 – 0.250– 0.350

+ 0.186– 0.025

0.225 – 0.536 1.5

7 Interference between roller and bushing

Standardsize



55 + 0.190+ 0.110

+ 0.093+ 0.063

0.017 – 0.127 —

8 Track roller side clearance(on one side)


0.160 – 0.345 1.5

9 Tread wall thickness(at center of width)

Standard size Repair limitRebuild orreplace37.5 32.5

TRACK ROLLER

PC130-7 40-9


SPROCKET

Unit: mm


1 Wear on tooth bottom diameterStandard size Tolerance Repair limit

Rebuild orreplace

547.4 + 1.0– 2.0 535

2 Wear on addendum diameter 607 — 595

3 Wear on addendum width 27 — 22

4 Wear on tooth bottom width 42 ± 1.5 39

5 Tooth bottom wall thickness 111.7 + 0.465– 1.160 105.5

SPROCKET

40-10 PC130-7


TRACK SHOE

TRIPLE SHOE, ROAD LINER, CITY PAD SHOE

1 Triple shoe and city pad shoe2 Road liner

a P portion shows the link of bushing press fitting end.

TRACK SHOE

PC130-7 40-11


Unit: mm

a The items marked * are for dry type track.


1 Link pitch


Turn of replace

175.25 178.25

2 Bushing outside diameterStandard size

When turned

Normal road Impact road

46.3 — 42.3

3 Link heightStandard size Repair limit

Rebuild or replace86 81

4 Thickness of link metal(bushing pressfitting portion) 24 19

Replace5

Shoe bolt pitch

102.4

6 86.4

7 57

8

Link

Inside diameter 52.4

Rebuild or replace9 Overall width 35

10 Tread width 30.1

11 Protrusion of pin 5.5

Adjust of replace

12 Protrusion of regular bushing 3.75

13 Overall length of pin 173

14 Overall length of bushing 86.7

15 Thickness of bushing metal


7.8 3.8

16 Thickness of spacer —

17

Press fitting force

Bushing 39.2 –137.2 kN {4 – 14 ton}

—18 Regular pin 78.4 –186.3 kN {8 – 19 ton}

*19 Master pin 39.2 – 98.1 kN {4 – 10 ton}

TRACK SHOE

40-12 PC130-7


Unit: mm

a The items marked * are for dry type track.


20Shoe bolt

a. Regular link

Tightening torque (Nm {kgm}) Additional tightening angle (deg)

Retighten

Triple shoeCity pad shoe

196 ± 20{20 ± 2} 90 ± 10

Road liner 147 ± 10{15 ± 1} 50 ± 5

b. Master link

Tightening torque (Nm {kgm})

Additional tightening angle (deg)

Lower limit torque (Nm {kgm})

— — —

No. of shoe (each side) 43 —

21 Interference between bushingand link

Standard sizeTolerance Standard

interference

Adjust or replace

Shaft Hole

46 + 0.387+ 0.347

+ 0.0620 0.285 – 0.387

22 Interference between regularpin and link 30 + 0.150

0– 0.198– 0.250 0.198 – 0.400

23 Clearance between regularpin and bushing


clearanceShaft Hole

30 + 0.1500

– 0.830– 0.330 0.180 – 0.830

*24 Interference between masterpin and link


interferenceShaft Hole

30 + 0.020– 0.020

– 0.198– 0.250 0.178 – 0.270

*25 Clearance between masterpin and bushing


interferenceShaft Hole

30 – 0.200– 0.300

+ 0.630+ 0.230 0.430 – 0.930

26 Height ofgrouser a. Road liner

Standard size Repair limitReplace

58 21

TRACK SHOE

PC130-7 40-13


RIPLE SHOE, CITY PAD SHOE

Unit: mm


1 Height of grouserStandard size Repair limit

Repair bybuild-upwelding or replace

20 10

2 Overall height of shoe 29.5 19.5

3 Thickness 9.5

4

Length of grouser top

14

5 13

6 15

TRACK SHOE

40-14 PC130-7


HYDRAULIC PUMP

HYDRAULIC PUMP

PC130-7 40-15


CONTROL VALVE

(1/9)

CONTROL VALVE

40-16 PC130-7


(2/9)

Unit: mm


1 Suction valve spring


Replace spring if any damages or deformations are found

Free lengthx O.D.

Installed length

Installed load Free length Installed

load

46.8 x 7.50 40.6 5.50±0.40N{0.56±0.04kg} — 4.40 N

{0.45 kg}

2 Suction valve spring 16.0 x 16.0 12.0 5.70 N{0.58 kg} — 4.50 N

{0.46 kg}

3 Piston spring 20.0 x 7.0 14.0 1.20 N{0.12 kg} — 0.98 N

{0.10 kg}

CONTROL VALVE

PC130-7 40-17


(3/9)

Unit: mm


1 Spool return spring



Free lengthx O.D.

Installed length


load

— 45.0 53.5 N{5.46 kg} — —

2 Spool return spring — 45.0 55.9 N{5.70 kg} — —

3 Spool return spring — 41.0 92.2 N{9.4 kg} — —

CONTROL VALVE

40-18 PC130-7


(4/9)

Unit: mm


1 Flow control valve spring



Free lengthx O.D.

Installed length


load

— 23.5 29.4 N{3 kg} — —

2 Pressure reduction valve spring 27.5 x 14.2 18.0 17.7±0.98N{1.80±0.10kg} — 13.7 N

{1.40 kg}

3 Pressure reduction valve spring 28.2 x 14.5 26.0 29.4±2.94N{3.0±0.30kg} — 23.5 N

{2.40 kg}

4 Pressure reduction valve spring 32.5 x 14.2 23 17.6 N{1.8 kg} — 14.1 N

{1.44 kg}

CONTROL VALVE

PC130-7 40-19


(5/9)

Unit: mm


1 Check valve spring

Standard size Repair limitReplace spring if any damages or deformations are found

Free lengthx O.D.

Installed length


load

41.5 x 8.50 31.5 5.88 N{0.60 kg} — 4.71 N

{0.48 kg}

CONTROL VALVE

40-20 PC130-7


(6/9)

Unit: mm


1 Lift check valve springCooler bypass valve spring



Free lengthx O.D.

Installed length


load

72.7 x 20.6 42.5 135±4.90N{13.8±0.50kg} — 113 N

{11.5 kg}

2 Lift check valve spring 72.7 x 20.6 42.5 67.7 N{6.9 kg} — —

3 Bleed spool return spring 23.3 x 12.5 23.0 3.92±0.98N{0.40±0.10kg} — 2.94 N

{0.30 kg}

CONTROL VALVE

PC130-7 40-21


(7/9)

Unit: mm


1 Travel junction spool


Free lengthx O.D.

Installed length


load

17.7 x 8.20 13.0 13.7±0.10N{1.40±0.10kg} — 10.1 N

{1.10 kg}

CONTROL VALVE

40-22 PC130-7


(8/9)

Unit: mm




Free lengthx O.D.

Installed length


load

41.5 x 8.50 31.5 5.88 N{0.60 kg} — 4.71 N

{0.48 kg}

CONTROL VALVE

PC130-7 40-23


(9/9)

CONTROL VALVE

40-24 PC130-7



FOR SERVICE VALVE

Unit: mm


1 Suction valve spring



Free lengthx O.D.

Installed length


load

16.3 x 21.3 9.50 2.06 N{0.21 kg} — 1.57 N

{0.16 kg}

2 Piston spring 20.0 x 7.0 14.0 2.06 N{0.21 kg} — 1.57 N

{0.16 kg}


PC130-7 40-25


SELF PRESSURE REDUCTION VALVE

Unit: mm


1 Spring (pressure reduction main)



Free lengthx O.D.

Installed length


load

19.2 x 7.20 16.1 19.6 N{2.0 kg} — 17.7 N

{1.80 kg}

2 Spring(pressure reduction valve pilot) 16.5 x 7.20 12.7 20.6 N

{2.10 kg} — 18.6 N{1.90 kg}

3 Spring 71.0 x 18.0 59.0 200 N{20.4 kg} — 186 N

{19.0 kg}

4 Spring (safety valve) 16.1 x 7.80 13.4 61.7 N{6.30 kg} — 58.8 N

{6.0 kg}

SELF PRESSURE REDUCTION VALVE

40-26 PC130-7


TRAVEL MOTOR

GM18VL-3

TRAVEL MOTOR

PC130-7 40-27


SWING MOTOR

KMF40ABE-3

Unit: mm





Free lengthx O.D.

Installed length


load

33.0 x 13.8 23.0 1.28 N{0.13 kg} — 0.98 N

{0.10 kg}

2 Shuttle valve spring 16.4 x 8.90 11.5 13.7 N{1.40 kg} — 10.8 N

{1.10 kg}

SWING MOTOR

40-28 PC130-7


SOLENOID VALVE

FOR PPC LOCK, 2ND TRAVEL SPEED SELECTOR, SWING AND PARK BRAKE, AND 2-STAGE RELIEF SOLENOID VALVE

SOLENOID VALVE

PC130-7 40-29


CENTER SWIVEL JOINT

Unit: mm


1 Clearance between rotor and shaft

Standard size Standard clearance Clearance limitReplace

80 0.056 – 0.105 0.111

CENTER SWIVEL JOINT

40-30 PC130-7


PPC VALVE FOR SWING, WORK EQUIPMENT

Unit: mm


1 Centering spring (for P3 and P4 ports)



Free lengthx O.D.

Installed length


load

44.45 x 15.5 34.0 29.4 N{3.0 kg} — 23.5 N

{2.40 kg}

2 Centering spring (for P1 and P2 ports) 47.93 x 15.5 34.0 39.2 N

{4.0 kg} — 31.4 N{3.20 kg}

3 Metering spring 26.53 x 8.15 34.0 16.7 N{1.70 kg} — 13.7 N

{1.40 kg}

PPC VALVE

PC130-7 40-31


FOR TRAVEL

Unit: mm


1 Metering spring



Free lengthx O.D.

Installed length


load

6.5 x 8.15 24.9 16.7 N{1.70 kg} — 13.7 N

{1.40 kg}

2 Centering spring 48.1 x 15.5 32.5 108 N{11.0 kg} — 86.3 N

{8.80 kg}

PPC VALVE

40-32 PC130-7


FOR SERVICE

Unit: mm


1 Centering spring



Free lengthx O.D.

Installed length


load

42.4 x 15.5 28.4 207.8 N{21.2 kg} — 167 N

{17.0 kg}

2 Metering spring 2.7 x 8.10 22.0 16.7 N{1.70 kg} — 13.3 N

{1.36 kg}

PPC VALVE

40-34 PC130-7


HYDRAULIC CYLINDER

BOOM CYLINDER

ARM CYLINDER

BUCKET CYLINDER

HYDRAULIC CYLINDER

PC130-7 40-35


Unit: mm


1Clearance between piston rod and bushing

Cylinder Standard size


Clearance limit

Replacebushing

Shaft Hole

Boom 70 – 0.030– 0.076

+ 0.259+ 0.063

0.093 –0.335 0.435

Arm 75 – 0.030– 0.076

+ 0.279+ 0.065

0.095 –0.355 0.455

Bucket 65 – 0.030– 0.076

+ 0.250+ 0.055

0.085 –0.326 0.426

2Clearance between piston rod support shaft and bushing

Boom 70 – 0.030– 0.100

+ 0.190+ 0.070

0.100 –0.290 1.0

Arm 70 – 0.030– 0.100

+ 0.190+ 0.070

0.100 –0.290 1.0

Bucket 65 – 0.030– 0.080

+ 0.170+ 0.070

0.100 –0.250 1.0

3Clearance between cylinder bottom sup-port shaft and bush-ing

Boom 70 – 0.030– 0.100

+ 0.190+ 0.070

0.100 –0.290 1.0

Arm 70 – 0.030– 0.100

+ 0.190+ 0.070

0.100 –0.290 1.0

Bucket 65 – 0.030– 0.080

+ 0.170+ 0.070

0.100 –0.250 1.0

4 Cylinder headtightening torque

Boom 172 ± 24.5 Nm {17.5 ± 2.5 kgm}

Re-tightening

Arm 270 ± 39 Nm {27.5 ± 4.0 kgm}

Bucket 172 ± 24.5 Nm {17.5 ± 2.5 kgm}

5 Cylinder piston tightening torque

Boom 294 ± 29.4 Nm {30.0 ± 3.0 kgm}

Arm 294 ± 29.4 Nm {30.0 ± 3.0 kgm}

Bucket 294 ± 29.4 Nm {30.0 ± 3.0 kgm}

6Cylinder piston lock screw tightening torque

Boom 66.2 ± 7.4 Nm {6.75 ± 0.75 kgm}

Arm 66.2 ± 7.4 Nm {6.75 ± 0.75 kgm}

Bucket 30.9 ± 3.4 Nm {3.15 ± 0.35 kgm}

HYDRAULIC CYLINDER

40-36 PC130-7


WORK EQUIPMENT

WORK EQUIPMENT

PC130-7 40-37


Unit: mm


1Clearance between connecting pin and bushing of revolving frame and boom.

Standard size


Clearance limit

Replace

Shaft Hole

70 – 0.030– 0.100

+ 0.130+ 0.065

0.095 –0.230 0.8

2Clearance between connecting pin and bushing of boom and arm.

70 – 0.030– 0.100

+ 0.141+ 0.074

0.104 –0.241 0.8

3 Clearance between connecting pin and bushing of arm and link. 60 – 0.030

– 0.080+ 0.129+ 0.074

0.104 –0.209 0.8

4Clearance between connecting pin and bushing of arm and buck-et.

60 – 0.030– 0.080

+ 0.135+ 0.074

0.104 –0.215 0.8

5Clearance between connecting pin and bushing of link and bucket.

65 – 0.030– 0.080

+ 0.133+ 0.074

0.104 –0.213 0.8

6 Clearance between connecting pin and bushing of link and link. 60 – 0.030

– 0.080+ 0.130+ 0.074

0.104 –0.210 0.8

7Clearance between the blade and track frame mounting pin and bushing

70 – 0.030– 0.100

+ 0.198+ 0.124

0.154 –0.298 1.5

WORK EQUIPMENT

40-38 PC130-7


DIMENSION OF WORK EQUIPMENT

ARM


PC130-7 40-39


Unit: mm

No. Measuring position Standard sizeTolerance

Shaft Hole

1 — 70 – 0.030– 0.100

+ 0.1000

2Arm side 81.5 + 1.0

0

Cylinder head side 80 ± 1.2

3Boom side 226 + 0.5

0

Arm side 226 – 0.2– 0.7

4 — 70 – 0.030– 0.100

+ 0.1000

5 — 264 ± 2.0

6 — 213.5 ± 1.0

7 — 640.6 ± 0.5

8 — 2,491 —

9 — 2,101.9 ± 1.5

10 — 290.4 ± 0.5

11 — 493 ± 0.2

12 — 422 ± 0.5

13 — 374.9 —

14 — 1,175.1 —

15 — 60 – 0.030– 0.080

+ 0.2000

16Link side 259 0

– 0.1

Bucket side 261 ± 1.0

17 — 60 – 0.030– 0.080

+ 0.2000

18Arm side 226 0

– 0.5

Bucket side 274 —

19Min. 1,378 —

Max. 2,263 —


40-40 PC130-7


BUCKET


PC130-7 40-41


Unit: mm

No. Measuring position Standard size Tolerance

1 — 371.3 ± 0.5

2 — 51.6 ± 0.5

3 — 97.9° —

4 — 374.9 —

5 — 1241.6 —

6 — 190.2 —

7 — 5° —

8 — 0° —

9 — 60 + 0.20

10 — 64 —

11 — 80 + 0.250

12 — 261 ± 1.0

13 — 50 —

14 — 85 —

15 — 380 + 1.00

16 — 18 —

17 — 110 —

18 — 130 —

19 — 132 —

20 — 108 —

21 — 274 —

22 — 51 —

23 — 34 —

24 — 104.2 —

25 — 119.6 —

26 — 74 —

27 — 65 —


PC130-7 90-1

HYDRAULIC CIRCUIT DIAGRAM........................................... 90- 3ELECTRICAL CIRCUIT DIAGRAM (1/4)................................. 90- 5ELECTRICAL CIRCUIT DIAGRAM (2/4)................................. 90- 7ELECTRICAL CIRCUIT DIAGRAM (3/4)................................. 90- 9ELECTRICAL CIRCUIT DIAGRAM (4/4)..................................90-11

90 OTHERS

HYDRAULIC CIRCUIT DIAGRAM

PC130-7 90-3

PC130-7 90-5

ELECTRICAL CIRCUIT DIAGRAM (1/4)

PC130-7 90-7


PC130-7 90-9


PC130-7 90-11


pc130-7

Documents

c maximum digging height

b overall height

b maximum digging depth

arma maximum digging

e maximum dumping height

c overall width

e cab height

g maximum reach