HIDR. 938H - Cargador Frontal

INTERACTIVE SCHEMATIC

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EC-C3EC-C2 E-C60

EC-C1

E-C61

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Hydraulic System938H/IT38H Wheel Loader

938H:MCC1-UPMJC1-UPJKM1-UPLKM1-UP

IT38H:JNJ1-UP

©2014 Caterpillar, All Rights Reserved Printed in U.S.A.

RENR8997-05August 2014

COMPONENT LOCATION

Description PartNumber

MachineLocation

SchematicLocation

Accumulator Gp - Pilot 275-7875Accumulator. Gp - Ride Cntrl (Attch) 259-4685Cylinder Gp - Lift 254-9037Cylinder Gp - Tilt Tilt, High Lift

346-1093346-1094

Filter Gp - Pump Case Drain 285-2235Manidfold Gp - Relief 277-9660Plate - Orifice 317-5574Pump Gp - Implement / Steering 304-9308Screen 9T-9227Tank Gp - Hydraulic Oil 255-2421Valve - Breaker Relief, Vacuum 258-2829Valve Gp - 2 Function 2 Function w/ Ride Control (Attch) 3 Function (Attch) 3 Function w/ Ride Control (Attch) 4 Function (Attch)

336-3818336-3819336-3820336-3821336-3822

Valve Gp - Ball, Dead Engine 112-1817Valve Gp - Mntng, Power Control 286-8970

Valve Gp - Pilot, 2 Funct. (Attch), 1 Joystick Pilot, 2 Funct., 2 Levers Pilot, 3 Funct. (Attch), 1 Joystick Pilot, 3 Funct. (Attch), 3 Levers Pilot, 4 Funct. (Attch), 1 Joystick Pilot, 4 Funct. (Attch), 4 Levers

261-8653261-8654261-8655261-8656261-8657261-8658

Valve Gp - Ride Cntrl (Attach) 314-4008Valve Gp - Tank Drain 245-5943

Cylinder Gp - Steering 314-9340Pump Gp - HMU 322-4638Pump Gp - Sec. Steer (Attch) 313-5855Screen Gp 306-4025Valve Gp - Check 128-6847Valve Gp - Check 303-5974Valve Gp - Check, Sec. Steer (Attch) 9T-1013Valve Gp - Priority, Steering 317-0953

Valve Gp - Shuttle, Load Sense 8J-6875

Cooler - Oil 282-2024

Accumulator Gp - Brake (Charged) 279-0093

Filter Gp - Fan Return 244-1031Control Gp - Foot Brake 271-0260

Manifold Gp - Brake / Fan 309-4907Motor Gp - Fan Fan, Cold Start Attachment

265-4925330-0826

Pump Gp - Fan 254-5145

Valve Gp - Ball, Dead Engine 112-1817Switch As - Limit (Stop Light) 105-6117

Sensor Gp - Position (Left Brake Pedal) 267-5222

Valve Gp - Check 175-0447Valve Gp - Brake Control (Service) 279-5719

Valve Gp - Check, Cooler Bypass 145-8983Valve Gp - Shutoff (Cold Start Attachment) 332-1166

Accmltr. Gp - Diff. Lck. (Attch) 245-2975Manifold Gp - Mntng, Man. Frnt Diff. Lck. Mntng, Auto. Frnt / Rear Diff. Lck.

244-7139244-7140

Pump Gp - Axle Oil Cooling (Attch) 273-1807Screen Gp - Magnetic, Front Axle Cooling 251-6351

Screen Gp - Magnetic, Rear Axle Cooling 251-6351Valve Gp - Relief,Axle Oil Clr Bypass 130-5202Valve Gp - Shuttle, Diff. Lck 8J-6875

Cylinder Gp - Quick Coupler (Attch) 311-1463Manifold Gp - Cntrl, Quick Coupler (Attch) 180-8585Valve Gp - Ball, Dead Engine 112-1817

Quick Coupler (Attachment)

Axle Hydraulic System (Attachment)

Implement System

Steering System

Fan / Brake System

1 C-4, F-32 D-1, F-13 C-3, F-2

4 C-4, F-3

5 C-86 D-87 B-4, F-38 D-89 C-7

15 B-6, C-716 C-8

17 B-2, E-1

18 C-4, F-319 D-7

20 F-5

21 C-122 C-7

23 F-824 F-825 E-826 D-827 E-828 C-829 E-830 D-8

31 D-7

32 D-6

51 C-6

33 D-652 D-5

34 C-6

35 D-6

36 C-7

37 C-654 D-5

53 D-5

38 D-655 C-5

39 D-640 D-7

41 B-7, F-7

42 B-7, F-7

43 E-644 D-6

45 E-646 E-647 D-8

48 A-3, D-349 A-4, D-350 A-4, D-3

TAP LOCATION

TapNumber Description Schematic

LocationFan Motor Supply Pressure Fan Pump Load Sense Pressure Implement / Steering Pump Load Sense Implement / Steering Pump Discharge Steering Supply Pressure Schedule Oil Sampling (SOS) Implement Pilot Supply Pressure Brake Accumulator Pressure Implement Supply Pressure Fan / Brake Pump Discharge Pressure Implmnt / Str Pump Case Drain Airbleed Fan Motor Case Drain Airbleed Differential Lock PressureDifferential Lock Accumulator PressureRear Brake Pressure Front Brake Pressure

G1 D-7G2 C-7G3 D-8G4 D-8G5 D-8G6 D-6G7 F-3, C-4G8 D-6G9 E-3, B-4G10 C-7G11 C-8G12 D-6G13 F-7G14 F-7G15 C-5G16 C-5

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

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling,Sensor) by letterYY

DRAIN / RETURN LINE

HYDRAULIC CIRCUIT COLOR DESCRIPTIONSIMPLEMENT AND STEERING PUMP OUTPUT

STEERING CIRCUIT

PILOT CIRCUIT

SECONDARY STEERING PUMP OUTPUTFAN CONTROL CIRCUIT

BRAKE COOLING CIRCUIT

4TH FUNCTION CONTROL CIRCUITSUPPLY LINE

COUPLER CYLINDERS AND CONTROL CIRCUITTILT CYLINDER CONTROL CIRCUIT

BRAKE CONTROL CIRCUITIMPLEMENT AND FAN PUMP LOAD SENSE CIRCUIT

DIFFERENTIAL LOCK CONTROL CIRCUIT

IMPLEMENT LOAD SENSE CIRCUIT

3RD FUNCTION CONTROL CIRCUITLIFT CYLINDERS AND RIDE CONTROL CIRCUIT

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.

SCHEMATIC PART NUMBER: 258-8893, CHANGE: 06, VERSION: -SCHEMATIC PART NUMBER: 310-3567, CHANGE: 01, VERSION: -

MEDIA NUMBER: RENR8997-05 THIS SCHEMATIC IS FOR THE 938H/IT38H WHEEL LOADER HYDRAULIC SYSTEM

Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.

12345678

A

B

C

D

E

F

12345678

A

B

C

D

E

F

12345678

A

B

C

D

E

F

12345678

A

B

C

D

E

F

3RD FUNCTION(ATTACHMENT)

QUICK COUPLER(ATTACHMENT)

HH

HH

A

1

2 3CO

T

PRPC1 C2TC1 TC2

FROM STEERING/IMPLEMENT PRIORITY VALVE

HYDRAULIC TANK

REAR AXLE

FRONT AXLE

DIFFERENTIAL LOCK CIRCUIT

PS PS1F

RACK

DUMP

RACK

DUMP

RAISE

LOWER

RAISE

LOWER

LS

P

TT1

A1

A2

FAN CONTROLSOLENOID

(31) VALVE GPSHUTTLELOAD SENSE8J-6875

STEERING

P

LS CF EF

TO SERVICE BRAKE VALVE(REAR AXLE)

TO SERVICE BRAKETOP PORT (FRONT AXLE)

a1 b1 b2a2 b3a3 b4a4

DUMP RACK LOWER/FLOAT

RAISE

RHLIFTARM

LHLIFTARM

RHLIFTARM

LHLIFTARM

LEVER MOTIONFORE AFT

4TH FUNCTION B PORT PILOT

3RD FUNCTION B PORT PILOT

RAISE PILOT

RACK BACK PILOT

VALVE DRAIN

IMPLEMENT LOAD SENSE

IMPLEMENT VALVE SUPPLY

IMPLEMENT RETURN

IMPLEMENT PILOT SUPPLY

DUMP PILOT

LOWER/FLOAT PILOT

3RD FUNCTION A PORT PILOT

4TH FUNCTION A PORT PILOT

AXLE OIL COOLING RETURN

AXLE OIL COOLING SUCTION

QUICK COUPLER SUPPLY

QUICK COUPLER RETURN

FRONT DIFFERENTIAL LOCK

AXLERESERVOIR DIFFERENTIAL

LOCK

b3b2b1

DR

P

T

A1 B1 a1 A2 B2 a2 B3 A3 a3

SEE 4TH FUNCTION WITH RIDE CONTROL

LS OUT



RAISE PILOT

RACK BACK PILOT

VALVE DRAIN



IMPLEMENT RETURN


DUMP PILOT

LOWER/FLOAT PILOT









LOCK

HOLD

CLOSE/LOWER

OPEN/RAISE

TILT

DUMP

RACKBACK

HOLD

DUMP

LIFT

RAISE

LOWERFLOAT

RAISE

HOLD

LOWER

FLOAT

RACK BACK

C1C2

RH LIFTARM

LH LIFTARM

A1 B1 A2 B2a1 a2 A3B3 a3 A4B4 a4

b4b3b2b1DR

LS OUT

P

T

NOTE A

TILT

LIFT

HOLD

CLOSE/LOWER

OPEN/RAISEDUMP

RACKBACK

HOLD

DUMP

RAISE

LOWER

FLOAT

RAISE

HOLD

LOWER

FLOAT

RACK BACK

RH LIFTARM

LH LIFTARM

HOLD

CLOSE/LOWER

OPEN/RAISE

RH LIFTARM

LH LIFTARM

C1

C2



RAISE PILOT

RACK BACK PILOT

VALVE DRAIN



IMPLEMENT RETURN


DUMP PILOT

LOWER/FLOAT PILOT









LOCK

ENGINE END FRAME

NON-ENGINE END FRAME - 2ND AND 3RD FUNCTION

NON-ENGINE END FRAME - 4TH FUNCTION WITH RIDE CONTROL ATCH

NOTE A : RESOLVER OMITTED FROM LAST SECTION IN VALVE STACK

NOTE B : FAN / IMPLEMENT / STEERING PUMP DRIVE : ENGINE DRIVE RATIO = 1 : 1

NOTE C : AXLE OIL COOLING PUMP DRIVE : ENGINE DRIVE RATIO = 1.5748 : 1

NOTE D : HIBERNATE ENGINE SPEED : 600 RPM LOW IDLE ENGINE SPEED : 800 RPM RATED ENGINE SPEED : 2100 RPM HIGH IDLE ENGINE SPEED : 2340 RPM

NOTE E : OPTIONAL ATTACHMENT

NOTE F : DEAD ENGINE LOWER VALVE

NOTE A

HEAD END RIDECONTROL SOLENOID

HEAD END RIDECONTROL SOLENOIDPILOT SHUT OFF

SOLENOID



PILOT SHUT OFFSOLENOID

QUICK COUPLERSOLENOID

QUICK COUPLERSOLENOID

DIFFERENTIAL LOCKPROPORTIONAL

SOLENOID

FRONT DIFF.LOCK ON-OFFSOLENOID

REAR DIFFERENTIALLOCK ON-OFFSOLENOID

POWER CONTROLSOLENOID

SEE 4TH FUNCTION WITH RIDE CONTROL

T LS

RL

VTL

LS

REAR AXLE

PRAT

CO

P C2 TC2 C1 TC1

FRONT AXLE

A

B

P

TLSC1

C0

A

B

P

TLSC1

C0

FRONT AXLE

3RD FUNCTION(ATTACHMENT)

4TH FUNCTION(ATTACHMENT) RIDE CONTROL

(ATTACHMENT)

QUICK COUPLER(ATTACHMENT)

RIDE CONTROL(ATTACHMENT)

M

NC

NO

CC

(42) MANIFOLD GPMOUNTING

AUTO FRONT / REAR DIFF. LOCK244-7140

MANUAL FRONT DIFF. LOCK244-7139

(41) ACCUMULATOR GPDIFF. LOCK(ATCH)245-2975

(15) TANK GPHYDRAULIC OIL

255-2421

(23) CYLINDER GPSTEERING314-9340

(24) PUMP GPHMU

322-4638

(25) PUMP GPSEC. STEER

(ATCH)313-5855NOTE E

(29) VALVE GPCHECKSEC. STEER(ATCH)9T-1013

(27) VALVE GPCHECK128-6847

(26) SCREEN GP306-4025

(30) VALVE GPPRIORITY,STEERING

317-0953

(6) MANIFOLD GPRELIEF

277-9660

(8) PUMP GPIMPLEMENT/

STEERING304-9308NOTE B

(16) VALVE GPBRKR RELIEFVACUUM258-2829


(5) FILTER GPCASE DRAIN285-2235

(47) VALVE GPSHUTTLE

DIFF. LOCK8J-6875

(36) PUMP GPFAN254-5145NOTE B

(9) SCREEN GP9T-9227

(15) TANK GPHYDRAULIC OIL

255-2421(34) MANIFOLD GP

CONTROLBRAKE / FAN

309-4907

(37) VALVE GPDEAD ENGINE

112-1817

(33) FILTER GPFAN RETURN244-1031


(32) COOLEROIL282-2024

(39) VALVE GPCOOLERBYPASS145-8983

(35) MOTOR GPFAN: 265-4925(ATCH FAN: 330-0826)NOTE E

(19) VALVE GPMOUNTING

POWER CONTROL286-8970

(41) ACCUMULATOR GPDIFF. LOCK

(ATCH)245-2975

(42) MANIFOLD GPMOUNTING

AUTO FRONT / REAR DIFF. LOCK244-7140

MANUAL FRONT DIFF. LOCK244-7139NOTE E

(45) SCREEN GPMAGNETIC251-6351NOTE E

(43) PUMP GPAXLE OIL COOLING

(ATCH)273-1807NOTE CNOTE E

(46) VALVE GPRELIEF AXLE OIL

COOLER BYPASS130-5202NOTE E

(44) SCREEN GPMAGNETIC251-6351

(55) VALVE GPBRAKE CONTROL

(SERVICE)279-5719

(52) CONTROL GPFOOT BRAKE271-0260

(51) ACCUMULATOR GPBRAKE

(CHARGED)279-0093

(54) SWITCH ASLIMIT(STOP LIGHT)105-6117

(53) SENSOR GPPOSITION

(LEFT BRAKE PEDAL)267-5222

(20) VALVE GPPILOT

261-8654: 2ND FUNCTION, 2 LEVERS261-8653: 2ND FUNCTION (ATCH), 1 JOYSTICK261-8656: 3RD FUNCTION (ATCH), 3 LEVERS

261-8655: 3RD FUNCTION (ATCH), 1 JOYSTICK, 1 LEVER261-8658: 4TH FUNCTION (ATCH), 4 LEVERS

261-8657: 4TH FUNCTION (ATCH), 1 JOYSTICK, 2 LEVERNOTE E

(18) VALVE GPDEAD ENGINE

112-1817NOTE F

(18) VALVE GPDEAD ENGINE112-1817NOTE F

(1) ACCUMULATOR GPPILOT

275-7875

(1) ACCUMULATOR GPPILOT

275-7875

(4) CYLINDER GPTILT: 346-1093

TILT, HIGH LIFT (ATCH): 346-1094NOTE E

(4) CYLINDER GPTILT: 346-1093TILT, HIGH LIFT (ATCH): 346-1094NOTE E

(3) CYLINDER GPLIFT

254-9037

(17) VALVE GP336-3818: 2ND FUNCTION

336-3819: 2ND FUNCTION W/ RIDE CONTROL (ATCH)336-3820: 3RD FUNCTION (ATCH)

336-3821: 3RD FUNCTION W/ RIDE CONTROL(ATCH)NOTE E

(17) VALVE GP4 FUNCTION (ATCH)

336-3822NOTE E

(2) ACCUMULATOR GPRIDE CONTROL (ATCH)

259-4685NOTE E

(49) MANIFOLD GPCONTROL

QUICK COUPLER (ATCH)180-8585NOTE E

(49) MANIFOLD GPCONTROL

QUICK COUPLER (ATCH)180-8585NOTE E

(48) CYLINDER GPQUICK COUPLER (ATCH)311-1463NOTE E

(48) CYLINDER GPQUICK COUPLER (ATCH)311-1463NOTE E

(21) VALVE GPRIDE CONTROL (ATCH)314-4008NOTE E

G1

G2

G8

G6

G11

G4

G5

G9

G7

G9

(50) VALVE GPDEAD ENGINE112-1817NOTE E

(50) VALVE GPDEAD ENGINE112-1817NOTE E

(22) VALVE GPTANK DRAIN

245-5943

(3) CYLINDER GPLIFT

254-9037

(2) ACCUMULATOR GPRIDE CONTROL (ATCH)

259-4685

(7) PLATEORIFICE317-5574

(7) PLATEORIFICE317-5574

G3

G14

G13

G12

G15

G16

G10

G7

(40) VALVE GPSHUT OFF

COLD START (ATCH)332-1166

MACHINE COMPONENT LOCATIONS

1

2

3

3 4

6

7

8

9 15 16 17

1819 20

21

22

232425 26 28 29 30 31

32

513334

35

36 37 38

39

40

4142

43

44

45

46

47

48

49

50

DIFFERENTIAL LOCK AND AXLE COOLINGCOMPONENT LOCATIONS

2

21

41

42

43

44

45

46

G13

G14

FAN / BRAKE COMPONENT LOCATIONS

RIGHT SIDE, REAR VIEW LEFT PEDALRIGHT SIDE, CENTER VIEW

32

3352

34

35

36

37

5453

38

55

39

4047

G1

G2

G6

G8

G10

G12

G15

G16

IMPLEMENT COMPONENT LOCATIONS

RIGHT SIDE, CENTER VIEW RIGHT SIDE, FRONT

1

34

5

6

7

9

15

16

17

1819

20

22

48

49

50

G3

G4G7

G9

G11

G13

G14

STEERING COMPONENT LOCATIONS

LOWER, LEFT SIDE, CENTER

23

24

25

26

27

28

29

30

31 G5

HIDR. 938H - Cargador Frontal

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