INTERACTIVE SCHEMATIC

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Cover PageInformation

SchematicMachine Views

Component TableTap Table

Fluid Power Symbols

Electrical Symbols

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Tap Views

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Bookmarks X

EC-C3EC-C2 E-C60

EC-C1

E-C61

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©2010 Caterpillar, All Rights Reserved Printed in U.S.A.

KENR7742November 2010

390D Excavator Hydraulic System - AttachmentWAG1-UPBYP1-UPWAP1-UPWBT1-UPKCZ1-UP

Boom Float

COMPONENT LOCATION

Description PartNumber

MachineLocation

SchematicLocation

335-0538335-0547212-5467210-8157

Note ANote ANote A

242-6878234-4531185-03366E-55346E-5534310-0122247-8978225-4614295-9447295-9446209-5895209-5895170-9918295-9678334-9990155-9222221-8859221-8859260-2180260-2180295-9595227-0678173-3429201-9382201-9381 241-8929295-7767140-0736352-6819116-3420155-9200155-9200

Accumulator GP - Hydraulic (Charged) 335-0547Sensor AS - Pressure (Boom Lowering) 221-8859Switch AS - Pressure (Boom Lower) 202-9002Valve GP - Check 297-0370Valve GP - Load Control (Boom) 274-9053Valve GP - Main Control (Smartboom, Boom Load Control) 295-7767Valve GP - Manual (Boom Lower) 270-5692Valve GP - Solenoid 171-0028

Attachment - Boom Float

Note A: Check Parts Manual For Proper Cylinder Part Number

Accumulator GP - Charged (Return Line)Accumulator GP - Hydraulic (Charged)Breather GPCooler GP - Hydraulic OilCylinder GP - BoomCylinder GP - BucketCylinder GP - StickFilter GP - Oil (Hydraulic)(Return) 1Filter GP - Oil (Hydraulic)(Return) 2Filter GP - Oil (Hydraulic)Filter GP - Oil (Hydraulic)(Case Drain, Motors)Filter GP - Oil (Hydraulic)(Case Drain, Pumps)Manifold and Valve GP - Load SensingMotor GP - FanMotor GP - Hydraulic FanMotor GP - Swing (Front)Motor GP - Swing (Rear)Motor GP - Travel (Left)Motor GP - Travel (Right)Pump GP - Fan MotorPump GP - Hydraulic (Swing)Pump GP - Hydraulic (Main)Pump GP - PilotSensor AS - Pressure (Load Sensing)Sensor AS - Pressure (Overload Warning)Sensor AS - Pressure (Main Pump)Sensor AS - Pressure (Swing Pump)Swivel GPTank AS - Hydraulic OilValve GP - Check 1Valve GP - Check 2Valve GP - Check 3Valve GP - Control (Swing)Valve GP - Control (Main)Valve GP - Manifold and ReducingValve GP - Solenoid (High Pressure Cutoff)Valve GP - Swing CushionValve GP - Travel Counterbalance (Left)Valve GP - Travel Counterbalance (Right)

1 C-12 D-43 A-84 B-75 F-76 F-87 F-88 A-89 A-810 B-811 A-712 A-713 B-514 A-615 A-716 F-417 F-318 F-619 F-520 A-521 A-422 A-323 A-524 B-625 C-626 A-327 A-528 E-529 A-830 A-631 C-132 C-833 E-33435 D-536 B-537 E-438 E-639 E-5

50 D-451 E-752 F-753 F-854 F-75556 E-757 F-8

C-4

C-3

TAP LOCATION

TapNumber Description Schematic

LocationDrive Pump Output PressureIdler Pump Output PressureLoad Sense Pressure (Main Hydraulic Pump)Stroking Pressure (Swing Pump) Pilot Pump Output PressurePilot Pressure to Swing PumpPilot Accumulator PressurePower Shift Pressure (Main Hydraulic Pump)

A A-3B A-3

LS2 A-2M1 A-4P A-5P1 A-5PG D-4PS1 A-3

FLUID POWER SYMBOLS

ONE POSITION TWO POSITION THREE POSITION

VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL

LINES CROSSING LINES JOINING

TWO-WAY THREE-WAY FOUR-WAY

SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION(FIXED)

2-SECTION PUMP

MAIN AUX.

SPRING(ADJUSTABLE)

VARIABILITY LINE RESTRICTION(VARIABLE)

LINE RESTRICTIONVARIABLE and PRESSURE

COMPENSATED

PRESSURECOMPENSATION

PUMP: VARIABLE andPRESSURE COMPENSATED

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULIC PUMPS

FLUID STORAGE RESERVOIRS

CROSSING AND JOINING LINES

VALVE ENVELOPES VALVE PORTS

BASIC COMPONENT SYMBOLS

FLUID CONDITIONERPUMP or MOTOR

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLSRELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNALSUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOIDor MANUAL

SOLENOIDand PILOT

SOLENOID and PILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

TWOPOSITION

INFINITEPOSITIONING

FLOW IN ONEDIRECTION

FLOW ALLOWED INEITHER DIRECTION

THREEPOSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOTCONTROLLED

ELECTRICAL SYMBOLSHydraulic Symbols (Electrical)

325-AG135 PK-14

Circuit IdentificationNumber

Wire Color Wire Gauge

Harness identification codeThis example indicateswire 135 in harness "AG".

325-PK-14

Wire Gauge

Wire Color

Circuit Number Identification

Wire Number Identification Codes

Current Standard

Previous Standard

Electrical Schematic Example Hydraulic Schematic Example

325-PK

Wire ColorCircuit Number Identification

B A

Wire

Wire

(EXAMPLE VALVE)

Current Standard

Transducer(Fluid)

Transducer(Gas / Air)

G

Generator

Electrical WirePressure Switch

MElectric Motor

Pressure Switch (Adjustable)

Temperature Switch

PressureSymbol

TemperatureSymbol

LevelSymbol

FlowSymbol

Electrical Symbols (Electrical)

T

HYDRAULIC CIRCUIT COLOR DESCRIPTIONSPILOT PUMP OUTPUTDRIVE PUMP OUTPUTHIGH PRESSURE CUTOFF CIRCUITDRIVE AND IDLER PUMPS COMBINED CIRCUITFAN PUMP AND CIRCUITSUPPLY LINESTICK CYLINDER & CONTROL CIRCUITLEFT TRAVEL MOTOR & CONTROL CIRCUITATTACHMENT CONTROL CIRCUITSWING MOTOR & CONTROL CIRCUITDRAIN / RETURN LINESWING BRAKESIDLER PUMP OUTPUT BUCKET CYLINDER & CONTROL CIRCUITRIGHT TRAVEL MOTOR & CONTROL CIRCUITBOOM CYLINDER & CONTROL CIRCUIT

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

CALLOUTS

Taps (Pressure, Sampling, Sensor - by letter)YY

(52) VALVE GP - CONTROL 138-1234

Callout Number(Machine Location from

Component LocationsTable)

ComponentName

Part Number

Components are shown installed on a fully operable machine with the key and engine off, transmission shifterin neutral and with parking brake set.Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.

390D EXCAVATOR HYDRAULIC SYSTEMATTACHMENT: BOOM FLOAT

PART NUMBER: 297-0424, CHANGE: 00, VERSION: HEMEDIA NUMBER : KENR7742

12345678

A

B

C

D

E

F

12345678

A

B

C

D

E

F

TRAVEL MOTOR (RIGHT)TRAVEL MOTOR (LEFT)

Pi5

Pi4

Pi3

Pi2

Pi1

PS

A4

PS

A3

PS

A2

PSA1

PAC

DR

1

DR

2

DR

3

DR

4

DR

5

DR

6P-INT-OUT

Pi6

DR6

DR5

GT2T1 R

AM2

A

S DR1 DR S M1

L2

L1

P2

D2S1D1

P1PS1 SA1 SA2a1 a2

LS1 LS2

AL3 BL3

PP3

T1

T2

BG

BA

AG BG AG

AB

T2

T1

PP3

A

DR

B

DR

A B

DR1

PS2

Pi1

P.P.

I

P.P.O

SWING MOTOR (FRONT) SWING MOTOR (REAR)DB

PG

SDr2PTSDr1

MM

PG2 DBPG1

PA

B

BA

PA PB

A

A1 B1A1 B1

(R) (L)

(R)(L)

(FWD)(FWD) (REV)

(REV)

L1G

Dr

L2

T

C1

C2

P

Dr

PF PR

BR2 AR2 BR3 AR3

AL2 BL2

AL1 BL1

PR

PF

AR1BR1

BR2 AR2 BR3 AR3

A

BLBRL BR

A

B

Qmax Qmin

(REV)(REV)(IN)

(FWD)(FWD)(OUT)

STI

CK

TRAV

EL(

L)

TRAV

EL(

R)

(CLOSE) (UP)

(OPEN) (DOWN)

BO

OM

BU

CK

ET

ATC

H

HPC-ON

aR3aR2aR1

bR3bR2bR1

R2

aL1aL2aL3

bL1bL2bL3

R1 HPC-OFF

(RET)

(EXT)

PS2

PS2

PS3

PS3 DR3

DR3 DR2

DR2

PS4 DR4

Pi2

Pi2

DR4

MU

PS4

AL1

BL1

BR1AR1AL2 BL2

MU

SP

PR

PD

PG

PB

TT CV CV

CYLCYL

Pi Pi DRDR

A1

A2

DR

A B

XX

P T

A1

A2

(1) ACCUMULATOR GPCHARGED (RETURN LINE)335-0538

(50) ACCUMULATOR GPHYDRAULIC (CHARGED)335-0547

(8) FILTER GPOIL (HYDRAULIC)

(RETURN) 1242-6878

(9) FILTER GPOIL (HYDRAULIC)

(RETURN) 2234-4531

(10) FILTER GPOIL (HYDRAULIC)

185-0336

(11) FILTER GPOIL (HYDRAULIC)(CASE DRAIN, MOTORS)6E-5534

(13) MANIFOLD AND VALVE GPLOAD SENSING310-0122

(14) MOTOR GPFAN247-8978

(15) MOTOR GPHYDRAULIC FAN225-4614

(16) MOTOR GPSWING (FRONT)295-9447

(17) MOTOR GPSWING (REAR)295-9446

(18) MOTOR GPTRAVEL (LEFT)209-5895

(19) MOTOR GPTRAVEL (RIGHT)209-5895

(20) PUMP GPFAN MOTOR

170-9918

(21) PUMP GPHYDRAULIC(SWING)295-9678

(22) PUMP GPHYDRAULIC (MAIN)334-9990

(23) PUMP GPPILOT

155-9222

(28) SWIVEL GP295-9595

(30) VALVE GPCHECK 1173-3429

(31) VALVE GPCHECK 2201-9382

(32) VALVE GPCHECK 3201-9381

(33) VALVE GPCONTROL (SWING)241-8929

(35) VALVE GPMANIFOLD AND REDUCING140-0736

(36) VALVE GPSOLENOID(HIGH PRESSURE CUTOFF)352-6819

(37) VALVE GPSWING CUSHION116-3420

(38) VALVE GPTRAVEL COUNTERBALANCE (LEFT)

155-9200 (39) VALVE GPTRAVEL COUNTERBALANCE(RIGHT)155-9200

LS2

PS1

M1

P

P1 BA

PG

(26) SENSOR ASPRESSURE (MAIN PUMP)260-2180

(27) SENSOR ASPRESSURE

(SWING PUMP)260-2180

(25) SENSOR ASPRESSURE(OVERLOAD WARNING)221-8859

(24) SENSOR ASPRESSURE(LOAD SENSING)221-8859

(3) BREATHER GP212-5467

(4) COOLER GPHYDRAULIC OIL210-8157

(29) TANK ASHYDRAULIC OIL

227-0678

(12) FILTER GPOIL (HYDRAULIC)(CASE DRAIN, PUMPS)6E-5534

(5) CYLINDER GPBOOM

(7) CYLINDER GPSTICK

(6) CYLINDER GPBUCKET

(57) VALVE GPSOLENOID171-0028 (53) VALVE GP

CHECK297-0370

(54) VALVE GPLOAD CONTROL (BOOM)

274-9053

(56) VALVE GPMANUAL (BOOM LOWER)270-5692

(55) VALVE GPCONTROL (MAIN)(SMART BOOM,

BOOM LOAD CONTROL)295-7767

(51) SENSOR ASPRESSURE

(BOOMLOWERING)

221-8859

(52) SWITCH ASPRESSURE

(BOOM LOWER)202-9002

(34) VALVE GPCONTROL (MAIN)295-7767

F8

E8

D8

C8

B8

A8

F7

E7

D7

C7

B7

A7

F6

E6

D6

C6

B6

A6

F5

E5

D5

C5

B5

A5

F4

E4

D4

C4

B4

A4

F3

E3

D3

C3

B3

A3

F2

E2

D2

C2

B2

A2

F1

E1

D1

C1

B1

A1

MACHINE COMPONENT LOCATIONS

P

P1

M1

A

PS1

B

LS2

3938

37

34

33

30

29

2827

26

24

23

22

2120

19

18

1716

1514

13

12

11

10

9

8

7

6

5

4

3

BOOM FLOAT

57

56

55

54 53

52

51

50

MAIN CONTROL COMPONENT LOCATIONS

REAR VIEW

FRONT VIEW

PG

36

35

32

31

25

2

1