8/18/2019 Cat 962H Wheel Loader Hydraulic System

1/2

   R   E   N   R   8   8   7   9 -   0

   4

   3   0   P

  a  g  e ,

   (   D   i  m  e  n  s   i  o  n  s  :   3   9   i  n  c   h  e  s  x   2   8   i  n  c   h  e  s   )

ONEPOSITION T W O P O S IT I ON T H RE E P O SI T IO N

V ENT ED P RE SS URI ZE D RETURNABOVEFLUIDLEVEL RETURNBELOWFLUIDLEVEL

LINESCROSSING LINESJOINING

TWO-WAY THREE-WAY FOUR-WAY

SPRING CONTROLVALVES RESTRICTION LINERESTRICTION

(FIXED)

2-SECTIONPUMP

MAINAUX.

SPRING

(ADJUSTABLE)VARIABILITY LINERESTRICTION

(VARIABLE)

LINERESTRICTIONVARIABLEand PRESSURE

COMPENSATED

PRESSURE

COMPENSATION

PUMP: VARIABLEandPRESSURECOMPENSATE D

ENERGYTRIAN GLES

HY DRA UL IC P NE UMA TIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIO NAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULICMOTORS

FIXED

DISPLACEMENT

VARIABLEDISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULICPUMPS

FLUIDSTORAGE RESERVOIRS

CROSSING ANDJOINING LINES

VALVE ENVELOPES VALVE PORTS

BASICCOMPONENT SYMBOLS

FLUIDCONDITIONERPUMPor MOTOR

FLUID POWER SYMBOLS

FIXED

DISPLACEMENT

VARIABLEDISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLSRELEASEDPRESSURE

EXTERNALRETURN INTERNALRETURN

REMOTESUPPLYPRESSUR E

SIMPLIFIED COMPLETE INTERNAL

SUPPLYPRESSURE

 ACCUMULATORS

SPRING LOADED GASCHARGED

SOLENOIDor MANUAL

SOLENOIDand PILOT

SOLENOIDandPILOTor MANUAL

COMBINATIONCONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULICANDPNEUMATICCYLINDERS

DOUBLEACTINGSINGLEACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

TWO

POSITIONINFINITE

POSITIONING

FLOWINONEDIRECTION

FLOWALLOWEDINEITHERDIRECTION

THREEPOSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMALPOSITION

 AB

PT

 AB

PT

SHI FTEDPOSI TION I NFINI TEPOSITI ON

CONTROL VALVES

 ATTACHMENT

MANUALSHUTOFF

SHUTTLE PILOTCONTROLLED

Hydraulic Symbols (Electrical)

Electrical Symbols Table

325-AG135 PK-14

Circuit IdentificationNumber 

Wire Color  Wire Gauge

Harness identification codeThis example indicates

wire 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 Color Circuit Number

Identification

B  A

Wire

Wire

(EXAMPLE VALVE)

Current Standard

Transducer (Fluid)

Transducer (Gas / Air)

G

Generator 

ElectricalWirePressure Switch

MElectric Motor 

Pressure Switch

(Adjustable)

Temperature Switch

T

PressureSymbol

TemperatureSymbol

LevelSymbol

FlowSymbol

Electrical Symbols (Electrical)

RENR8879-04 April2010

950H, 962H and IT62H Wheel Loader Hydraulic System

950H:N1A1-UPM1G1-UPK5K1-UP

J5J1-UPJAD1-UP

962H:N4A1-UPM3G1-UPK6K1-UP

J6J1-UPMAL1-UP

©2010 Caterpillar 

 AllRights Reserved

Printed in U.S.A.

IT62H:M5G1-UP

QQ

48RR

FF

1

DD

CC

The service center is located on the right side of the machine belowthe cab. The Followingcomponents are located in the service center:

- Case drain filter (31)- Hydraulic oilfluid sampling valve (SOS)- Hydraulic systems kidney loop filter (28)

- Brake system accumulators (49)

The Following components are not referenced on the Hydraulic System Schematic:

- Power train oilfluid sampling valve (A)- Power train oilfilter (B)- Ecology drain for the hydraulic tank (C)

The following remote pressure taps are located inside the panel on the frontside of theservice center:

- Steering pump outlet pressure (EE)- Brake system accumulator pressure (PP)

The Following components are not referenced on the Hydraulic System Schematic:

- Transmission reverse clutch (A)- Transmission forward clutch (B)

- Transmission fourth speed clutch (C)- Transmission third speed clutch (D)

- Transmission second speed clutch (E)- Transmission first speed clutch (F)

- Torque converter inlet pressure (G)- Transmission lubrication pressure (H)- Transmission pump outlet pressure (J)

- Torque converter outlet pressure (K)- Steering cylinder rod end grease fittings (L)- Rear axle oscillation bearing grease fittings (M)

FANAND BRAKEHYDRAULICSYSTEM

The fan and brake pump (25) is located on the front gear train of the engine, on the right side of the

machine. The fan and brake pump providesoilflow for the electronicdemand fan systemand thebrake hydraulicsystem. The outlet pressure tap (AA) islocated on the fan and brake pump.

 Also located on the engine on the right side of the machine is the fan controland brake accumulator

charging valve (30). The fan pump load sense pressure tap (HH) is located above the brake chargingvalve.

Thefollowingcomponentsarelocatedunder thefrontofthe cab.

- Hand metering unit (1)- Foot service brake valve (48)

- Steer pump load sense test port (FF)- Front sercive brake test port (QQ)

- Rear service brake test port (RR)

BOTTOMVIEW

RIGHT SIDE MACHINE VIEW

COMMAND CONTROL STEERING

This photo shows a front viewof the implement controlvalve (36) in the loader frame. Thefollowing components can be seen in this view:

- Pilot accumulator (24)

- Pilot supply pressure tap (GG)

The Following components are not referenced on the Hydraulic System Schematic:

- Pressure differentialrelief valve (A)

- Head end solenoid valve (ride control) (B)- Signalrelief valve (C)

- Tilt anti-drift valve (D)- Rod end solenoid valve (ride control) (E)- Ride controlbalance solenoid valve (F)- Pilot pressure reducing valve (G)

- Lift cylinder head end pressure tap (H)- Lift cylinder head end pressure sensor for Payload Control System and Autodig (J)- Hydraulic lockout solenoid valve (K)

This photo shows a left rear viewof the implement controlvalve (36). The following components can

be seen in this view:

- Implement controlvalve supply pressure tap (GG)

The Following components are not referenced on the Hydraulic System Schematic:

- Tilt anti-drift valve (A)- Signalrelief valve (B)

- Signalduplication valve (C)- Return to tank port (D)- Supply port from pump (E)

- Signalline to pump (F)- Tank line (G)- Screen (H)- Tilt back pilot solenoid valve (J)

- Tilt back pilot (K)- Tilt cylinder rod end line relief (L)- Ride controlbalance solenoid valve (M)- Rod end solenoid valve (ride control) (N)

FAN & BRAKE PUMP

SERVICE CENTER

HMU & SERVICE BRAKESIMPLEMENT CONTROL VALVE

This drawing shows a right side viewof the wheelloader. The following components can be seenin this view:

- Implement pump pressure tap (CC)- Implement pump load Sense pressure tap (DD)

Machine Component Locations

FRONT VIEWREAR VIEW

TILT CYLINDER LINES GROUP

VIEW A - A

RIGHT SIDE VIEW

31

49

28

25

30

SOS

EE PP

HH

 AA

MM

NN

KK LL

10

6

24GG

CC

 A

B

C

 A B

F

ED

G

C H J

M

L

K

 A B

F

E

D

G

H

J

K

C

C A B

F

E

D

GHJ

K

L

M

N

3

8

23

20

115

27

26

43

3233

423

8

5

11

24

7

12

36

10

22

41

2

4

6

2

4

6

9

21

45

47

46

48

28

31

49

34

35

25

53

3 0 1 3

14

50

52

51 5

12

28

7

23

31

50

51

52

3

8

49

13

14

25

30

53

34

35

42

2

4

6

9 10

11

22

36

24

41

2643

27

32331

45

47

46

48

20

21 15

YYXX

YYXX

15

15

12

Tap Locations

Pressure, Sampling, and Sensor Tap

Number Description

Schematic

Location

 AA FanPumpDischarge Pressure B-8

E-9C C I mp le me nt Pu mp Ch arg ePr es su re E -9

D D I mp le me nt Pu mp L oa d Se ns e Pr es su re B -7

EE Steer Pump Pressure B-7

F F S te er Pu mp L oa d Se ns e Pr es su re A -4 o rC -4

GG Pilo t Supply Pressure E-5

HH Fan Pump Lo ad Sense Pressure B-8

K K C om ma nd C o n tr ol R ig ht S te er P il ot P re ss ur e D -2

L L C om ma nd C o nt ro l L e ft S te er P il ot P re ss ur e D -2

M M Co mm a nd Co n tr o l S t ee r in g Ne ut r al P i lo t P r es s D- 3

N N C om ma nd C o nt ro l S t ee ri ng S up p ly P re ss ur e D -3

PP Service Brake Pressure F-3

QQ Fron tService Brake Pre ssure F-4

RR Rear Service Brake Pressure F-4

XX Tilt Cylind er Ro dEn dPressure F-8

YY Tilt Cylind er He ad End Pressu re F-8

SOS Hydraulic Oil Sampling Port B-9

Item

Number Descript ion

Part

Number 

Schemat ic

Locat ion

1 Hand Metering Unit 230-4176 A-4

2 C onnector -Orif ice 122-2340 B-3 ,B-4

3 Cylinder Gp -Steer 163-0324 B-1

4 V al ve Gp - Neu tra li zer 146- 7571 B -3 , B-4

5 Valve Gp - Steer 142-4000 B-2

6 Valve Gp -Neutralizer 8J-1553 D-3

7 Valve Gp - Steer 124-8635 D-1

8 Cylinder Gp -Steer 163-0324 E-1

9 Valve Gp - Check 111-7775 D-3

10 Valve Gp - Pilot 147-1790 D-4

11 Valve Gp - Shuttle 8J-6875 C-3

12 Screen Gp 154-2883 E-2

13 Pump Gp -Steering 241-9299 A-6

14 Pump Gp -Implement 254-4108 A-7

Cylinder -Tilt 242-4220 F-8

C yl in de r- T il t (M id Li ft ) 2 47 -0 49 7 F -8

C yl in de r- T il t (H ig hL if t) 2 45 -7 49 1 F -8

C yl in de r- T il t (L og ge r) 2 45 -7 48 7 F -8

20 Cylinder -Lift (LH) 242-4272 F-7

21 Cylinder -Lift (RH) 242-4271 F-7

22 Valve -Choke Check 276-9072 D-9

2 3 V al ve Gp - Ma nu al L ow er in g 1 12 -1 81 7 E -9

24 Accumulator -Pilot Oil 245-2975 F-5

25 Pump Gp - Fan 254-5146 B-8

26 Motor Gp - Fan 246-6152 D-6

27 V al ve Gp - Coo ler Bypas s 244- 1426 B- 9

28 Filter Gp -Return Oil 244-1031 B-9

3 0 M an if ol d Gp - F an & B ra ke C ha rg e 2 42 -1 30 7 C -8

31 Filter Gp -Case Drain 249-2334 A-8

3 2 V alv eG p- Brea ke rR eli ef 220- 0814 A- 8

33 Tank G p- Hydraulic Oil 237-2742 A-8

3 4 V al ve G p - Se co nd ar y St ee r Di ve rt er 1 41 -2 59 7 B -6

35 P um pG p- Sec onda ry St eer 275- 8544 A- 6

ValveGp-Control

(2FunctionStandard)2 61 -4 17 1 D -9

ValveGp-Control

(2FunctionW/RC)2 61 -3 68 2 D -9

ValveGp-Control

(3Function)2 61 -4 17 2 D -9

ValveGp-Control

(2FunctionW/RC) 2 61 -3 68 3 D -9

ValveGp-Control (SnowRemoval)

(3FunctionW/RC)2 74 -8 05 5 D -9

4 1 A cc um ul at or - R id e Co nt ro l ( RC ) 2 45 -2 97 3 F -6

42 Val ve Gp - Co nt ro l & Rel ief 263- 583 2 C -7

43 M ot or Gp - Rever sing Fa n 228- 8527 C -6

25 Pump Gp - Fan 254-5146 F-2

3 0 M an if ol d Gp - F an & B ra ke C ha rg e 2 42 -1 30 7 F -2

45 Control Gp -Foot Brake 193-1448 F-3

4 6 S wi tc hA s- F oo t Br ak eL im it 1 05 -6 11 7 F -3

47 Sensor Gp -Foot Brake 214-4863 F-3

48 Valve Gp -Foot Brake 215-3687 F-3

4 9 A cc um ul at or - Se rv ic eB ra ke 2 13 -8 77 3 F -2

5 0 A ct ua to rA s- Pa rk in gB ra ke 1 29 -8 09 0 F -1

5 1 V alv eG p- Park ing Brak e 106- 177 4 F -2

5 2 S wi tc h As - P ar ki ng B ra ke P re ss ur e 1 74 -4 31 2 F -1

53 S wit ch As - Bra ke Pr es sur e 175- 3244 F -3

Component Locations

36

15

HMU STEERINGCIRCUIT

COMMAND CONTROL STEERING

MAIN SCHEMATIC

BRAKE SYSTEM

54 Val ve Gp - Q ui ck Cou ple r 180- 85 85 C -9

5 5 C yl in de r G p - Q ui ck C ou pl er 2 37 -0 94 6 C -9

56 Valve Gp - Manual 112-1817 C-9

8/18/2019 Cat 962H Wheel Loader Hydraulic System

2/2

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   4

   3   0   P  a  g  e ,

   (   D   i  m  e  n  s   i  o  n  s  :   3   9   i  n  c   h  e  s  x   2   8   i  n  c   h  e  s   )

DRAIN / RETURN LINE

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

IMPLEMENT PUMP OUTPUT

PRIMARY STEERING PUMP CIRCUIT

STEERING CIRCUIT

IMPLEMENT PILOT SUPPLY OIL

 AUXILIARY CIRCUIT

IMPLEMENT PUMP LOAD SENSING CIRCUIT

SUPPLY LINE

TILT CYLINDER CIRCUIT

LIFT CYLINDER CIRCUIT

SECONDARY STEERING CIRCUIT

BRAKE CHARGE VALVE AND FAN CONTROL CIRCUIT

MAIN RELIEF VALVE LOAD SENSING CIRCUIT

BRAKE CONTROL CIRCUIT

EE AA

SOS

HH

DD

FF

MMNN

LL KK

FF

GG

XX

YY

CC

RR

QQ

PP

HMU STEER AND 3PC IMPLEMENT

COMMAND CONTROL STEERING ATTACHMENT

a1

a1

b1

b1

c1

c1 c1

d1

d1

d1

e1

e1

e1

CROSSOVERRELIEF

SHUTTLEVLV

DIRECTIONAL SPOOL

MAKEUPCHECK

BACKUPRELIEF

PRESSUREREDUCING

VALVE

PILOT PORT"A"

PILOT PORT"B"

REGULATED

PRESS. PORTTO PILOT VALVE

TANKPORT

CYL PORT "A"CYL PORT "B"

LOADSENSINGPUMPPORT

Port ALever ForwardLeft Hand Line on Boom(When Viewed From Cab)

CROSSOVERRELIEF

CYL PORT "A"

CYL PORT "B"

MAKE-UPCHECKS

DIRECTIONAL SPOOL

BACK-UPRELIEFPUMPPORT

HMUSUPPLYPORT

PILOT PORT "B"

PILOT PORT "A"

PILOT CONTROL SPOOL

TILT

RACKBACK

DUMP

RACK

BACK

HOLD

DUMP

LIFT

RAISE

LOWER/

FLOAT

RAISE

HOLD

LOWER

FLOAT

HOLD

HEADEND

PORT“B”

3RDFUNCTION

(ATTACHMENT)

PORT A

PORTB

LS DR

R H

LS P T

F

PS

 A1  A2

950HAND962HWHEEL LOADERHYDRAULICSYSTEMSCHEMATIC

PART#: 241-0475 CHG 09 and BRAKESYSTEM PART# 244-1398 CHG 00

Components are shown installed on a fully operable machine.

Refer to the appropriate Service Manualfor Troubleshooting, Specifi cations and Systems Operations

TO FRONT

BRAKES

TO REARBRAKES

BRAKE SYSTEM

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

 Attachment

 Air Line

CALLOUTS

Taps (Pressure, Sampling,Sensor) by letter 

Components by number 

YY

52

 A1 A2

PS

F

LS P T

To Fan Motor

ToCase Drain

Manifold

NC

NO

CCTO TRANSMISSION

CONTROL

TO BRAKE

LIGHTS

 APPLY

RELEASE

FRONT AXLE

REARAXLE

HYDRAULICTANK

Connection b1 only for Command Control Steering

 A

B

C

D

E

F

 A

B

C

D

E

F

2345678 2345678 1

2345678 2345678 11

 A

C

D

E

F

B

C

D

E

F

B

9

9

Port BLever RearwardRight Hand Line on Boom(When Viewed From Cab)

QUICK COUPLER(ATTACHMENT)

(1) Hand Metering Unit:230-4176

(4) Valve Gp - Meutralizer:146-7571

(2) Connector -Orifice: 122-2340

(5) Valve Gp - Steer:142-4000

(3) Cylinder Gp -Steer: 230-4176

(11) Valve Gp - Shuttle:8J-6875

(9) Valve Gp - Check:111-7775

(6) Valve Gp -Neutralizer: 8J-1553

(10) Valve Gp - Pilot:147-1790

(12) Screen Gp:154-2883

(8) Cylinder Gp - Steer:163-0324

(7) Valve Gp - Steer:124-8635

(48) Valve Gp - Foot Brake:215-3687

(30) Manifold Gp -Fan and Brake Charge: 242-1307

(25) Pump Gp - Fan:254-5146

(52) Switch As -Parking Brake Pressure:174-4312

(50) Actuator As. -Parking Brake:129-8090

(51) Valve Gp - Parking Brake:106-1774

(49) Accumulator - Service Brake:213-8773

(45) ControlGp - Foot Brake:193-1448

(46) Switch As. - Foot Brake Limit:105-6117

(53) Switch As. - Brake Pressure:175-3244

(47) Sensor Gp - Foot Brake:214-4863

(31) Filter Gp -Case Drain:

249-2334

(32) Valve Gp -Breaker Relief:

220-0814

(28) Filter Gp - Return Oil:244-1031

(27) Valve Gp -Cooler Bypass:

244-1426

(34) Valve Gp - Secondary Steer Diverter:

141-2597

(26) Motor Gp -Fan: 246-6152

(54) Valve Gp -Quick Coupler:180-8585

(56) Valve Gp -Manual: 112-1817

(55) Cylinder Gp - QuickCoupler:237-0946

(30) Manifold Gp -Fan and Brake Charge:

242-1307

(25) Pump Gp - Fan:254-5146

(36) Valve Gp - Control:2 Function Standard: 261-4171

2 Function W/RC: 261-36822 Function W/RC: 261-3683

3 Function Standard: 261-41723 Function W/RC: 274-8055

(23) Valve Gp - ManualLowering:112-1817

(15) Cylinder Gp -Tilt: 242-4220

Tilt (Mid Lift): 247-0497Tilt (High Lift): 245-7491Tilt (Logger): 245-7487

(21) Cylinder - Lift (RH)242-4271

(41) Accumulator - Ride Control(RC):245-2973

(20) Cylinder - Lift (LH):242-4272

(24) Accumulator - Pilot Oil:245-2975

(14) Pump Gp - Implement:254-4108

(13) Pump Gp - Steering:241-9299

(35) Pump Gp - Secondary Steer:275-8544

(33) Tank Gp - Hydraulic Oil:237-2742

Relief:272-7003256-2866

Relief:272-7003

Relief:247-8632

Relief:254-5789

Relief:282-4349

Relief:4T-7581

Relief:272-2334

Relief:272-2334