Download - Hyundai 130w-3 Hyd
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GROUP 1 HYDRAULIC CIRCUIT
TB
XBa2
dr1~dr14
Aa1
Ba1
XBb2
XAs
As
Bd
XAd
Ad
XBd
Ak1
Pa1
Ck1
XAks fl frdr8
XAah
XBa1
OP
dr10
Bs
XBs
Pz P1 PxPi
RP2
XAa2
XBa2
XAks
XAk
Bk1
XBk
At
Bt
XAt
XBt
Ao
Ck2
XBt
XAa1
XAas
T2~T4
Bo
Py
dr9
DOZER SWING ARM BOOM BUCKET
XBd XAd XBa1 XAa1 XBb1 XBk XAk
XBs XAs
ACCELERATOR
XAa1
XAa2
XAasSh
Pg
Pi
dr2
XAt Pz
XBb1
Sh
A B
Pgdr7
Ab1
XAah
P
T
P
dr6 dr5 dr3 dr4
T1
Pa1
P2 P1
fr(pi2)
dr1
A1 A2
fl(pi1)
320k(350k)
380k
380k
380k
220k
dr12 dr13
T4P
G1 G2 G3 G4 G5 G6
TP
P1 T3
TM2
TM1
P2 P1
T2
dr14 T1
3545 46 33 3422
12
15
1314
8
1744
37
20
7
37
2932
21 5
37
31
30
2827
26
2423
25
E
6
3
42
43
38
47
1940
16
918
41
10
11
1
3939
2
Mu
XAo
XBo
T
B A
360k
4
3-1
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The pilot circuit consists of suction circuit, delivery circuit and return circuit.
The pilot pump is provided with relief valve, receives the oil from the hydraulic tank through the
suction filter.
The discharged oil from the pilot pump flows to the remote control valve through line filter, EPPR
valve, solenoid valve assemblies, swing parking brake, main control valve and safety lock solenoid
valve through line filter.
GROUP 3 PILOT CIRCUIT
Control valve
Acceleratorpedal
Remote control valve
(LH lever)
RCV
lever(Dozer)
Remote control valve
(RH lever)
Safety locksolenoid valve Swing parking brake
Main pump
Line filter
Relief valve40kg/cm2
Travel speed shift port oftransmission
Pilot pumpSuction filter
Arm half flow solenoid valve
Power boost solenoid valve
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The pilot pump receives oil from the hydraulic tank. The discharged oil from the pilot pump flows to
the safety solenoid valve through the line filter. The oil is filtered by the line filter. The pilot relief
valve is provided in the pilot pump for limiting the pilot circuit pressure.
The oil filtered by line filter flows into the remote control valve through safety solenoid valve.
The return oil from remote control valve is returned to hydraulic tank through the spin filter.
1. SUCTION, DELIVERY AND RETURN CIRCUIT
PILOT PUMP
RELIEF VALVE
HYD TANK
SAFETYSOLENOIDVALVE
GEARPUMP
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVETRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BOOM1
BUCKET
OPTION
T2~T4
dr1~dr14
Pg
Pi
dr2
BOOM BUCKETACCELERATOR DOZER SWING ARM
PEDAL RCV LEVER(DOZER)
RCV LEVER(LH) RCV LEVER(RH)
GAUGE BLOCK
TRAVEL
LINE FILTER
SPIN FILTER
STRAINER
dr6 dr5 dr3 dr4
T1
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When the lever of the safety solenoid valve is moved downward, oil flows into the remote control
valve through solenoid valve and line filter.
When the lever of the safety solenoid valve is moved upward, oil does not flow into the remote
control valve because of block by the spool.
PILOT PUMP
RELIEF VALVE
HYD TANK
SAFETYSOLENOIDVALVE
GEARPUMP
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVETRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BOOM1
BUCKET
OPTION
BOOM BUCKETACCELERATOR DOZER SWING ARM
PEDAL RCV LEVER(DOZER)
RCV LEVER(LH) RCV LEVER(RH)
GAUGE BLOCK
TRAVEL
LINE FILTER
SPIN FILTER
STRAINER
T2~T4
dr1~dr14
Pg
Pi
dr2
dr6 dr5 dr3 dr4
T1
LEVERDOWN
LEVER UP
2. SAFETY SOLENOID VALVE(SAFETY LEVER)
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When the power max switch on the left control lever is pushed ON, the power max solenoid valve is
actuated, the discharged oil from the pilot pump flows into Pz port of the main relief valve in main
control valve ; Then the setting pressure of the main control valve is raised from 320 kgf/cm2 to
350kgf/cm2 for increasing the digging power. And even when pressed continuously, it is canceled
after 8 seconds.
3. MAIN RELIEF PRESSURE CHANGE CIRCUIT
PILOT PUMP
RELIEF VALVE
HYD TANK
SAFETYSOLENOIDVALVE
GEARPUMP
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BOOM1
BUCKET
OPTION
BOOM BUCKETACCELERATOR DOZER SWING ARM
PEDAL RCV LEVER(DOZER)
RCV LEVER(LH) RCV LEVER(RH)
GAUGE BLOCK
TRAVEL
LINE FILTER
SPIN FILTERSTRAINER
Pz
POWER BOOSTSOLENOID VALVE
T2~T4
dr1~dr14
PgPi
dr2
dr6 dr5 dr3 dr4
T1
PzMAIN RELIEFVALVE
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When the swing control lever is operated, the pilot oil flows to Sh port of shuttle valve, this pressure
moves spool so, discharged oil from pilot pump flows to Pg port.
This pressure is applied to swing motor disc cylinder, thus the brake is released.
When the swing control lever is set in neutral position, oil in the swing motor disc cylinder is drained,
thus the brake is applied.
4. SWING PARKING BRAKE RELEASE
PILOT PUMP
RELIEF VALVE
HYD TANK
SAFETYSOLENOIDVALVE
GEARPUMP
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BOOM1
BUCKET
OPTION
BOOM BUCKETACCELERATOR DOZER SWING ARM
PEDAL RCV LEVER(DOZER)
RCV LEVER(LH) RCV LEVER(RH)
GAUGE BLOCK
TRAVEL
LINE FILTER
SPIN FILTERSTRAINER
Sh T2~T4
dr1~dr14
PgPi
dr2
dr6 dr5 dr3 dr4
T1
A BMu
dr7Pg
Sh
SWING MOTOR
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When the arm half flow switch is turned ON, the arm half flow solenoid valve is switched to ON and
Arm2 pilot port XAa2 is connected with drain line : So the spool of ARM2 is not actuated. As a result,
the arm in operation is only the ARM1 section. This function is useful for fine control of the arm in
case of finishing work.
5. ARM HALF FLOW SYSTEM
XAa1
PILOT PUMP
RELIEF VALVE
HYD TANK
SAFETYSOLENOIDVALVE
GEARPUMP
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BOOM1
BUCKET
OPTION
BOOM BUCKETACCELERATOR DOZER SWING ARM
PEDAL RCV LEVER(DOZER)
RCV LEVER(LH) RCV LEVER(RH)
GAUGE BLOCK
TRAVEL
LINE FILTER
SPIN FILTER
STRAINER
XAa1
XAa2
ARM HALFSOLENOIDVALVE
Pz
T2~T4
dr1~dr14
Pg
Pi
dr2
dr6 dr5 dr3 dr4
T1
XAah
XAah
XAa2
XBa2
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When LH multifunction switch was placed in high or low position, the pressure oil from pilot pump
flows through parking solenoid valve of transmission control valve to travel speed solenoid valve,
thus the transmission is changed into high or low speed condition.
6. TRAVEL SPEED CONTROL PRESSURE
PILOT PUMP
RELIEF VALVE
HYD TANK
SAFETYSOLENOIDVALVE
GEARPUMP
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVEHIGH
SPEED
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BOOM1
BUCKET
OPTION
BOOM BUCKETACCELERATOR DOZER SWING ARM
PEDAL RCV LEVER(DOZER)
RCV LEVER(LH) RCV LEVER(RH)
GAUGE BLOCK
TRAVEL
LINE FILTER
SPIN FILTERSTRAINER
T3
T2~T4
dr1~dr14
PgPi
dr2
dr6 dr5 dr3 dr4
T1
LOW
SPEED
TRAVELSPEEDVALVE
PARKINGSOLENOID
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When the right control lever is pulled back, the boom spools in the main control valve are moved to
the raise position by the pilot oil pressure from the remote control valve.
The oil from the front and rear pump flows into the main control valve and then goes to the large
chamber of boom cylinders.
At the same time, the oil from the small chamber of boom cylinders returns to the hydraulic oil tank
through the boom spool in the main control valve. When this happens, the boom goes up.
When the boom is raised and the control lever is returned to the neutral position, the circuit for the
holding pressure at the bottom end of the boom cylinder is closed by the boom holding valve.This prevents the hydraulic drift of boom cylinder.
1. BOOM RAISE OPERATION
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
BOOM2 BOOM1
GAUGE BLOCK
FRONTPUMP
REARPUMP
BOOM HOLDINGVALVE
XBb2 XBb1
XAb1
Bb1
dr11
P1 P2 R
T1
P1Op
GROUP 4 SINGLE OPERATION
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When the right control lever is pushed forward, the boom spools in the main control valve are moved
to the lower position by the pilot oil pressure from the remote control valve.
The oil from the rear pump flows into the main control valve and then goes to the small chamber of
boom cylinders. At the same time, the oil from the large chamber of boom cylinders returns to the
hydraulic tank through the boom spool in the main control valve.
When the lowering speed of boom is faster, the oil returned from the large chamber of boom cylinder
combines with the oil from the rear pump, and flows into the small chamber of the cylinder.
This prevents cylinder cavitation by the negative pressure when the rear pump flow can not match
the boom down speed. And the excessive pressure in the boom cylinder rod end circuit isprevented by the relief valve.
2. BOOM DOWN OPERATION
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
BOOM2
BOOM1
GAUGE BLOCK
FRONTPUMP
REARPUMP
P1 P2 R
T1
XAb1
Bb1
dr11
P1Op
XBb2
RELIEF VALVE
MAKE UP VALVE
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When the left control lever is pulled back, the arm spools in the main control valve are moved to the
roll in position by the pilot oil pressure from the remote control valve.
The oil from the front and rear pump flows into the main control valve and then goes to the large
chamber of arm cylinder.
At the same time, the oil from the small chamber of arm cylinder returns to the hydraulic oil tank
through the arm spool in the main control valve. When this happens, the arm rolls in.
The cavitation which will happen to the bottom of the arm cylinder is also prevented by the make-up
valve in the main control valve.
For arm half function, refer to page 3-10.
3. ARM ROLL IN OPERATION
XAa2XAa1
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1ARM2
GAUGE BLOCK
FRONTPUMP
REARPUMP
P1 P2 R
T1ARM HALF SOLENOID VALVE
XAah
XAa2
MAKEUPVALVE
RELIEFVALVE
XAh
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When the left control lever is pushed forward, the arm spools in the main control valve are moved to
the roll out position by the pilot oil pressure from the remote control valve.
The oil from the front and rear pump flows into the main control valve and then goes to the small
chamber of arm cylinder.
At the same time, the oil from the large chamber of arm cylinder returns to the hydraulic oil tank
through the arm spool in the main control valve. When this happens, the arm rolls out.
The cavitation which will happen to the rod of the arm cylinder is also prevented by the make-up
valve in the main control valve.
4. ARM ROLL OUT OPERATION
ARM2
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSON
VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
GAUGE BLOCK
FRONTPUMP
REARPUMP
P1 P2 R
T1
XBa1
XBa2XBa2
MAKEUPVALVE
RELIEFVALVE
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When the right control lever is pulled left, the bucket spool in the main control valve is moved to the
roll in position by the pilot oil pressure from the remote control valve.
The center bypass valve is changed over by the pilot pressure(XAk2) and then the oil from the front
pump is joined to the flow of rear pump via confluence passage.
The oil from the front and rear pump flows into the main control valve and then goes to the large
chamber of bucket cylinder.
At the same time, the oil from the small chamber of bucket cylinder returns to the hydraulic oil tank
through the bucket spool in the main control valve. When this happens, the bucket rolls in.
The cavitation which will happen to the bottom of the bucket cylinder is also prevented by the make-up valve in the main control valve.
5. BUCKET ROLL IN OPERATION
BUCKET
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSON
VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
GAUGE BLOCK
FRONTPUMP
REARPUMP
P1 P2 R
T1
XAk2
XAk
Ck2
Ck1 XAk2
CENTERBYPASS VALVE
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When the right control lever is pushed right, the bucket spool in the main control valve is moved to
the roll out position by the pilot oil pressure from the remote control valve.
The oil from the rear pump flows into the main control valve and then goes to the small chamber of
bucket cylinder.
At the same time, the oil from the large chamber of bucket cylinder returns to the hydraulic oil tank
through the bucket spool in the main control valve. When this happens, the bucket rolls out.
The cavitation which will happen to the rod of the bucket cylinder is also prevented by the make-up
valve in the main control valve.
6. BUCKET ROLL OUT OPERATION
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSON
VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
BUCKET
GAUGE BLOCK
FRONTPUMP
REARPUMP
P1 P2 R
T1
XBk
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When the dozer control lever is pulled back, the dozer spool in the main control valve is moved to the
dozer up position by the pilot oil pressure from the remote control valve.
The oil from the front pump flows into the main control valve and then goes to the small chamber of
dozer cylinders.
At the same time, the oil from the large chamber of dozer cylinders returns to the hydraulic oil tank
through the dozer spool in the main control valve. When this happens, the dozer goes up.
7. DOZER UP OPERATION
RCV LEVER(DOZER)
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
DOZER
GAUGE BLOCK
FRONTPUMP
REARPUMP
P1 P2 R
T1
PILOT CHECKVALVE
Pg
Pi
dr2
DOZER
LINE FILTER
XAdXBd
XBd
XAd
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When the dozer control lever is pushed forward, the dozer spool in the main control valve is moved
to the dozer down position by the pilot oil pressure from the remote control valve.
The oil from the front pump flows into the main control valve and then goes to the large chamber of
dozer cylinders.
At the same time, the oil from the small chamber of dozer cylinders returns to the hydraulic oil tank
through the dozer spool in the main control valve. When this happens, the dozer blade is down.
8. DOZER DOWN OPERATION
PILOT PUMP
HYD TANK
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSON
VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
DOZER
GAUGE BLOCK
FRONTPUMP
REARPUMP
P1 P2 R
T1
SAFETYSOLENOIDVALVE
Pg
Pi
dr2
DOZER
RCV LEVER(DOZER)
LINE FILTER
SWING MOTOR
XBd
XAd
XAdXBd
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When the left control lever is pushed left or right, the swing spool in the main control valve is moved
to the left or right swing position by the pilot oil pressure from the remote control valve.
The oil from the rear pump flows into the main control valve and then goes to the swing motor.
At the same time, the oil returned from the swing motor returns to the hydraulic oil tank through the
swing spool in the main control valve.
When this happens, the superstructure swings left or right.
The swing parking brake, make up valve and the overload relief valve are provided in the swing
motors. The cavitation which will happen to the swing motor is also prevented by the make-up valvein the swing motor itself.
9. SWING OPERATION
PILOT PUMP
HYD TANK
SAFETYSOLENOIDVALVE
GEARPUMP
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
SWING
T2~T4
dr1~dr14
Pg
Pi
T1
dr2
SWING ARM
RCV LEVER(LH)
GAUGE BLOCK
LINE FILTER
SPIN FILTER
STRAINER
A BMu
dr7Pg
Sh
FRONTPUMP
REARPUMP
XBs XAsSh
XBs
XAs
P1 P2 RP1 P2 R
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SWING CIRCUIT OPERATION
PARKING BRAKE
BRAKE RELEASE VALVE
BRAKE OFFSh
Pg
BRAKE ON
BYPASS VALVE
MOTOR BRAKE VALVE
MAKE UP VALVE
BAMAKE UPPORT(Mu)
TO/FROM MAIN CONTROL VALVE
dr
MOTOR BRAKE VALVE
Motor brake valve for the swing motor limits to cushion the starting and stopping pressure of swing
operation.
MAKE UP VALVE
The make up valves prevent cavitation by supplying return oil to the vacuum side of the motor.
PARKING BRAKE
In case that the parking of the machine at slope is required during operation, there is the danger of
involuntary swing caused by the self weight of the machine. The brake is connected to prevent this
involuntary swing.
PARKING BRAKE "OFF" OPERATION
The parking brake is released by the pilot pressure oil from the pilot pump.
When the left control lever is placed in the swing position, the pilot pressure at the shuttle valve is
transferred to the brake release valve and the brake release valve is changed over. Then the pilot
pressure lifts the brake piston and releases the parking brake.
PARKING BRAKE "ON" OPERATION
When the control lever is placed in the neutral position, the pressure of the pilot oil passage goes
down.
Then the brake release valve is returned to the neutral position and the oil is returned from the
brake piston to the tank. And the brake is set to "ON".
BYPASS VALVE
This bypass valve absorbs shocks produced as swing motion stops and reduced oscillation cause
by swing motion.
1)
2)
3)
4)
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When the LH multifunction switch is placed in forward or reverse position, the travel spool in the main
control valve is moved to the forward or reverse position by the pilot oil pressure from pilot pump
through the travel pilot solenoid of transmission control valve and travel Forward/Reverse solenoid
valve. The oil from the rear pump flows into the main control valve and then goes to the travel motor.
At the same time, the oil returned from the travel motor returns to the hydraulic oil tank through the
turning joint and travel spool in the main control valve.
When this happens, the machine moves forward or reverse.
The cavitation which will happen to the travel motor is prevented by the make-up valve in the main
control valve.
10. TRAVEL FORWARD AND REVERSE OPERATION
PILOT PUMP
HYD TANK
SAFETYSOLENOIDVALVE
GEARPUMP
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
T2~T4
dr1~dr14
Pg
Pi
T1
dr2
BOOM BUCKETACCELERATOR DOZER SWING ARM
PEDAL RCV LEVER(DOZER)
RCV LEVER(LH) RCV LEVER(RH)
GAUGE BLOCK
TRAVEL
LINE FILTER
SPIN FILTER
STRAINER
FRONTPUMP
REARPUMP
P1 P2 R
TURNINGJOINT
XAt XBt
XAt
XBt
TRAVEL FORWARD/REVERSESOLENOID VALVE
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TRAVEL CIRCUIT OPERATION
TRAVEL MOTOR
TO/FROM MAIN CONTROL VALVE
T
TB
TURNING JOINT
CHECK VALVE
COUNTER BALANCEVALVE
OVERLOAD
RELIEF VALVE
AB
Valves are provided on travel motors to offer the following functions.
COUNTER BALANCE VALVE
When stopping the motor on a slope descending, this valve prevents the motor from over running.
OVERLOAD RELIEF VALVE
Relief valve limits the circuit pressure below 350kgf/cm2 to prevent high pressure from being
generated at the time of stopping the machine. When stopping the motor, this valve sucks the oil
from lower pressure passage for preventing the negative pressure and the cavitation of the motor.
1)
2)
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11. FRONT AND REAR AXLE BRAKE SYSTEM(SERVICE BRAKE)
PILOT PUMP
HYD TANK
GEARPUMP
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
TRANSMISSONVALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BOOM1
BUCKET
OPTION
T2~T4
dr1~dr14
Pg
Pi
T1
dr2
GAUGE BLOCK
TRAVEL
LINE FILTER
SPIN FILTER
STRAINER
FRONTPUMP
REARPUMP
P1 P2 R
When the brake pedal(Valve) is pushed, the discharged oil from the gear pump flows into the front
and rear axle brake disc through the solenoid valve of brake supply valve.
This pressure is applied to axle brake disc, thus the brake is applied.
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12. STEERING CIRCUIT OPERATION
PILOT PUMP
HYD TANK
GEARPUMP
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTORDOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BOOM1
BUCKET
OPTION
T2~T4
dr1~dr14
Pg
Pi
T1
dr2
GAUGE BLOCK
TRAVEL
LINE FILTER
SPIN FILTER
STRAINER
FRONTPUMP
REARPUMP
P1 P2 R
STEERINGVALVE
P T2
STEERINGCYLINDER
SPOOL
GEROTOR
When the steering wheel is turned to the left or right, the spool within the steering valve turns left or
right hand direction : Because the spool is connected with steering column.
At this time, the oil discharged from the gear pump flows into steering cylinder through spool and
gerotor within the steering valve.
Then the steering direction is applied.
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3-26
13. RAM LOCK CIRCUIT OPERATION
PILOT PUMP
HYD TANK
GEARPUMP
SWING MOTOR
BRAKE SUPPLYVALVE
BRAKE VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTOR DOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BOOM1
BUCKET
OPTION
T2~T4
dr1~dr14
Pg
Pi
T1
dr2
GAUGE BLOCK
TRAVEL
LINE FILTER
SPIN FILTERSTRAINER
FRONTPUMP
REARPUMP
P1 P2 R
OSCILLATING CYL
LOCKING
VALVE
RAM LOCKSOLENOID
P1 T3
P
When the ram lock switch is selected, the ram lock solenoid is changed over.
Thus, the oil discharged from the pilot pump flows into oscillating cylinder through ram lock solenoid
and locking valve.
This pressure is applied to check valve and oscillating cylinder, thus the oscillating function is
operated(Ram lock released).
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The oil from the front and rear pump flows through the neutral oil passage, bypass oil passage and
confluence oil passage in the main control valve. Then the oil goes to each actuator and operates
them. Check valves and orifices are located on these oil passage in the main control valve. These
control the oil from the main pumps so as to correspond to the operation of each actuator and
smooth the combined operation.
1. OUTLINE
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLY
VALVE
BRAKE VALVE
TRANSMISSON
VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTOR
DOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BOOM1
BUCKET
OPTION
GAUGE BLOCK
TRAVEL
FRONT
PUMP
REAR
PUMP
P1 P2 R
T1
GROUP 5 COMBINED OPERATION
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When the swing and boom functions are operated, simultaneously the swing spool and boom spools
in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve.
The oil from the rear pump flows into the boom cylinders through boom 1 spool in the right control
valve.
The oil from the front pump flows into the swing motor through swing spool.
At the same time, the pressure in the boom circuits can be high while the swing pressure is low,
therefore the oil from the front pump flows into the boom cylinders through boom 2 spool via
confluence passage in case of boom raise operation. The superstructure swings and the boom is
operated.
2. COMBINED SWING AND BOOM OPERATION
XBb2
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLY
VALVE
BRAKE VALVE
TRANSMISSON
VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTOR
DOZER CYL ARM CYL BOOM CYL BUCKET CYL
BOOM2
SWING
BOOM1
GAUGE BLOCK
FRONT
PUMP
REAR
PUMP
P1 P2 R
T1
XBs
XAs
dr10
OP
XAb1
XBb1
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When the swing and arm functions are operated, simultaneously the swing spool and arm spools in
the main control valve are moved to the functional position by the pilot oil pressure from the remote
control valve. The oil from the front pump flows into the swing motor through swing spool and arm
cylinder through arm 1 spool.
At the same time, the pressure in the arm circuits can be high while the swing pressure is low,
therefore the oil from the rear pump flows into the arm cylinder through arm 2 spool via confluence
passage. The superstructure swings and the arm is operated.
Meanwhile the pilot oil pressure(XAas) of swing shuttle valve flows into the stroke limiter of armspool, then the swing priority is maintained.
3. COMBINED SWING AND ARM OPERATION
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLY
VALVE
BRAKE VALVE
TRANSMISSON
VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTOR
DOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
SWING
ARM2
GAUGE BLOCK
FRONT
PUMP
REAR
PUMP
P1 P2 R
T1
XBs
XAs
XAa2XAa1
XBa1
XBa2XBa2
XAah
ARM HALF SOLENOID VALVE
XAah
XAa2
FROM SWING LEVER
XBs XAs
Sh XAas
XAas
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When the swing and bucket functions are operated, simultaneously the swing spool and bucket
spool in the main control valve are moved to the functional position by the pilot oil pressure from the
remote control valve.
The oil from the rear pump flows into the bucket cylinder through bucket spool in the right control
valve.
The oil from the front pump flows into the swing motor through swing spool in the left control valve.
The superstructure swings and the bucket is operated.
4. COMBINED SWING AND BUCKET OPERATION
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLY
VALVE
BRAKE VALVE
TRANSMISSON
VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTOR
DOZER CYL ARM CYL BOOM CYL BUCKET CYL
SWING BUCKET
GAUGE BLOCK
FRONT
PUMP
REAR
PUMP
P1 P2 R
T1
XBs
XAs
XBk
XAks
XAk
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When the swing, boom, arm and bucket functions are operated, simultaneously each spool in the
main control valve is moved to the functional position by the pilot oil pressure from the remote control
valve. The oil from the rear pump flows into the boom cylinder, arm cylinder and bucket cylinder
through the boom 1 spool, arm 2 spool, bucket spool and the parallel and confluence oil passage in
the right control valve. The oil from the front pump flows into the swing motor, boom cylinder and arm
cylinder through the swing spool, boom 2 spool, arm 1 spool, and the parallel and confluence oil
passage in the left control valve. The superstructure swings and the boom, arm and bucket are
operated.
5. COMBINED SWING, BOOM, ARM AND BUCKET OPERATION
BOOM1XBb2
dr10
XAah
XAa1
PILOT PUMP
HYD TANK
SWING MOTOR
BRAKE SUPPLY
VALVE
BRAKE VALVE
TRANSMISSON
VALVE
FRONT AXLE REAR AXLE
TRANSMISSON
TRAVEL MOTOR
DOZER CYL ARM CYL BOOM CYL BUCKET CYL
ARM1
BOOM2
SWING
DOZER
ARM2
BUCKET
OPTION
GAUGE BLOCK
TRAVEL
FRONT
PUMP
REAR
PUMP
P1 P2 R
T1
XBa1
XBa2
XAas
XAa2
XBa2
OP
XAb1
XBb1
XBs
XAs
XBk
XAk2
XAk
Pa1