Cat 962H Wheel Loader Hydraulic System

RENR8879-04 April 2010

B

C

28

31

MAIN AUX.

PUMP or MOTOR

E

49

G H

TWO-WAY

THREE POSITION

CHECK VALVES

AB

P T SHIFTED POSITION

P T NORMAL POSITION

GG

INFINITE POSITION

The service center is located on the right side of the machine below the cab. The Following components are located in the service center:

- Pilot accumulator (24) - Pilot supply pressure tap (GG)

- Case drain filter (31) - Hydraulic oil fluid sampling valve (SOS) - Hydraulic systems kidney loop filter (28) - Brake system accumulators (49)

950H, 962H and IT62H Wheel Loader Hydraulic System

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

- Pressure differential relief valve (A) - Head end solenoid valve (ride control) (B) - Signal relief valve (C) - Tilt anti-drift valve (D) - Rod end solenoid valve (ride control) (E) - Ride control balance 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)

PRESSURE

950H: N1A1-UP M1G1-UP K5K1-UP J5J1-UP JAD1-UP

- Power train oil fluid sampling valve (A) - Power train oil filter (B) - Ecology drain for the hydraulic tank (C)

962H: N4A1-UP M3G1-UP K6K1-UP J6J1-UP MAL1-UP

IT62H: M5G1-UP

FLOW

TEMPERATURE

UNIDIRECTIONAL

BIDIRECTIONAL

FLUID STORAGE RESERVOIRS

VENTED

RETURN ABOVE FLUID LEVEL

PRESSURIZED

RETURN BELOW FLUID LEVEL

COMBINATION CONTROLS

SOLENOID

SOLENOID or MANUAL

SERVO

SOLENOID and PILOT or MANUAL

SOLENOID and PILOT

MANUAL CONTROL SYMBOLS

MANUAL SHUTOFF

PUSH-PULL LEVER

B

EE

G

GENERAL MANUAL

PUSH BUTTON

D

SPRING LOADED

L E

D

C

CC

COMMAND CONTROL STEERING

K H

Part Number

Schematic Location

1

Hand Metering Unit

230-4176

A-4

2

Connector - Orifice

122-2340

B-3 , B-4

3

Cylinder Gp - Steer

163-0324

B-1

4

Valve Gp - Neutralizer

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

COMMAND CONTROL STEERING

8

Cylinder Gp - Steer

163-0324

E-1

9

Valve Gp - Check

111-7775

D-3

10

Valve Gp - Pilot

147-1790

D-4

8J-6875

C-3

154-2883

E-2

11

Valve Gp - Shuttle Screen Gp MAIN SCHEMATIC

13

Pump Gp - Steering

241-9299

A-6

14

Pump Gp - Implement

254-4108

A-7

15

Cylinder - Tilt

242-4220

F-8

Cylinder - Tilt (Mid Lift)

247-0497

F-8

Cylinder - Tilt (High Lift)

245-7491

F-8

Cylinder - Tilt (Logger)

245-7487

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

23

Valve Gp - Manual Lowering

112-1817

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

Valve Gp - Cooler Bypass

244-1426

B-9

28

Filter Gp - Return Oil

244-1031

B-9

30

Manifold Gp - Fan & Brake Charge

242-1307

C-8

31

Filter Gp - Case Drain

249-2334

A-8 A-8

32

Valve Gp - Breaker Relief

220-0814

33

Tank Gp - Hydraulic Oil

237-2742

A-8

34

Valve Gp - Secondary Steer Diverter

141-2597

B-6

35

Pump Gp - Secondary Steer Valve Gp - Control (2 Function Standard)

275-8544

A-6

261-4171

D-9

Valve Gp - Control (2 Function W/RC)

261-3682

D-9

Valve Gp - Control (3 Function)

261-4172

D-9

Valve Gp - Control (2 Function W/RC)

261-3683

D-9

Valve Gp - Control (Snow Removal) (3 Function W/RC)

274-8055

D-9

41

Accumulator - Ride Control (RC)

245-2973

F-6

42

Valve Gp - Control & Relief

263-5832

C-7

43 54

Motor Gp - Reversing Fan Valve Gp - Quick Coupler

228-8527 180-8585

C-6 C-9

36

55

Cylinder Gp - Quick Coupler

237-0946

C-9

56

Valve Gp - Manual

112-1817

C-9

BRAKE SYSTEM 25

Pump Gp - Fan

254-5146

F-2

30

Manifold Gp - Fan & Brake Charge

242-1307

F-2

45

Control Gp - Foot Brake

193-1448

F-3

46

Switch As - Foot Brake Limit

105-6117

F-3

47

Sensor Gp - Foot Brake

214-4863

F-3

48

Valve Gp - Foot Brake

215-3687

F-3

49

Accumulator - Service Brake

213-8773

F-2 F-1

50

Actuator As - Parking Brake

129-8090

51

Valve Gp - Parking Brake

106-1774

F-2

52

Switch As - Parking Brake Pressure

174-4312

F-1

53

Switch As - Brake Pressure

175-3244

F-3

F G

This photo shows a left rear view of the implement control valve (36). The following components can be seen in this view: - Implement control valve supply pressure tap (GG) The Following components are not referenced on the Hydraulic System Schematic: - Tilt anti-drift valve (A) - Signal relief valve (B) - Signal duplication valve (C) - Return to tank port (D) - Supply port from pump (E) - Signal line 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 control balance solenoid valve (M) - Rod end solenoid valve (ride control) (N)

Schematic Location

Fan Pump Discharge Pressure

CC

Implement Pump Charge Pressure

E-9

DD

Implement Pump Load Sense Pressure

B-7

EE

Steer Pump Pressure

B-7

Steer Pump Load Sense Pressure Pilot Supply Pressure

CC

BIDIRECTIONAL

BIDIRECTIONAL

CROSS FLOW

PARALLEL FLOW

FLOW IN ONE DIRECTION

FLOW ALLOWED IN EITHER DIRECTION

Printed in U.S.A.

Electric Motor

Electrical Wire

Temperature Switch

Temperature Symbol

Flow Symbol

Level Symbol

Electrical Schematic Example

1

XX

YY

Hydraulic Schematic Example Current Standard

Current Standard Wire Circuit Number Identification

Wire Color

325-AG135 PK-14 325-PK

This drawing shows a right side view of the wheel loader. The following components can be seen in this view: - Implement pump pressure tap (CC) - Implement pump load Sense pressure tap (DD)

IMPLEMENT CONTROL VALVE

Circuit Identification Number

Wire Color

Wire Gauge

Previous Standard Wire Color

Wire

325-PK-14

HMU & SERVICE BRAKES

VIEW A - A

B Circuit Number Identification

A

Wire Gauge (EXAMPLE VALVE)

TILT CYLINDER LINES GROUP 1

45 46

20

47 48

21

15

15 1 20

21

27

31

26 43

49

25

FAN AND BRAKE HYDRAULIC SYSTEM

AA 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 provides oil flow for the electronic demand fan systemand the brake hydraulic system. The outlet pressure tap (AA) is located on the fan and brake pump.

45 46

26 43

47 48

HH

42 3

3

8

8

Also located on the engine on the right side of the machine is the fan control and brake accumulator charging valve (30). The fan pump load sense pressure tap (HH) is located above the brake charging valve.

23 13

50 51

34

25

13

3

50

5 7

2

LL

Command Control Left Steer Pilot Pressure

D-2

35

53

14

52

35

30

14

8

51

12 23

4

MM

Command Control Steering Neutral Pilot Press

D-3

NN

Command Control Steering Supply Pressure

D-3

42

53

49 52

28 31

6

PP

Service Brake Pressure

F-3

QQ

Front Service Brake Pressure

F-4

F-8

RIGHT SIDE VIEW

- 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)

25 30

B-9

Pressure Symbol

The following components are located under the front of the cab.

34

Tilt Cylinder Head End Pressure

Generator

T

15

B-8

Hydraulic Oil Sampling Port

Pressure Switch (Adjustable)

Harness identification code This example indicates wire 135 in harness "AG".

D-2

F-4

Transducer (Gas / Air)

Pressure Switch

QQ

Fan Pump Load Sense Pressure

F-8

Transducer (Fluid)

M

Wire Number Identification Codes

Command Control Right Steer Pilot Pressure

Rear Service Brake Pressure

Hydraulic Symbols (Electrical)

G

FF

E-5

Tilt Cylinder Rod End Pressure

15

DD

A-4 or C-4

XX

Electrical Symbols Table

YY

RR

KK

YY

UNIDIRECTIONAL

TWO POSITION

THREE POSITION

48

HH

SOS

UNIDIRECTIONAL

INFINITE POSITIONING

Electrical Symbols (Electrical)

B-8

RR

XX

SERVICE CENTER

28

AA

FF

VARIABLE DISPLACEMENT NON-COMPENSATED

K

J

- 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)

27

Tap Locations Pressure, Sampling, and Sensor

GG

FIXED DISPLACEMENT

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

32 33

Description

INTERNAL PASSAGEWAYS

HYDRAULIC MOTORS

VARIABLE DISPLACEMENT NON-COMPENSATED

DOUBLE ACTING

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

33 32

Tap Number

SINGLE ACTING

LINES JOINING

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

HMU STEERING CIRCUIT

12

HYDRAULIC AND PNEUMATIC CYLINDERS

REAR VIEW

9

10

22 24

2

5 7 10

11

36 41

4

11 12 22

4

6

24 36 41

6

9

2

30

FRONT VIEW

Machine Component Locations

FAN & BRAKE PUMP

30 Page, (Dimensions: 39 inches x 28 inches)

Description

INTERNAL SUPPLY PRESSURE

COMPLETE

© 2010 Caterpillar All Rights Reserved

Component Locations Item Number

H

LINES CROSSING

HYDRAULIC PUMPS

E

J

CROSSING AND JOINING LINES

GAS CHARGED

FIXED DISPLACEMENT

L

RIGHT SIDE MACHINE VIEW

SIMPLIFIED

M

M

12

LL

INTERNAL RETURN

RENR8879-04

KK

SPRING

REMOTE SUPPLY PRESSURE

ACCUMULATORS

F C

PEDAL

PP EXTERNAL RETURN

B

DETENT

THERMAL

PILOT CONTROL SYMBOLS

A

A

PILOT CONTROLLED

ROTATING SHAFTS

RELEASED PRESSURE

N

SHUTTLE

SPRING LOADED

BASIC SYMBOL

MEASUREMENT

This photo shows a front view of the implement control valve (36) in the loader frame. The following components can be seen in this view:

FOUR-WAY

THREE-WAY

CONTROL VALVES

24

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

ATTACHMENT

LINE RESTRICTION VARIABLE and PRESSURE COMPENSATED

VALVE PORTS

TWO POSITION

ONE POSITION

AB

NN

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

VALVE ENVELOPES

C

A

PUMP: VARIABLE and PRESSURE COMPENSATED

2-SECTION PUMP

VALVES

B F

6

LINE RESTRICTION (FIXED)

RESTRICTION

PRESSURE COMPENSATION

LINE RESTRICTION (VARIABLE)

SPRING (ADJUSTABLE)

VARIABILITY

J

BOTTOM VIEW

CONTROL VALVES

SPRING

FLUID CONDITIONER

D

K MM

BASIC COMPONENT SYMBOLS

SOS

A

10

FLUID POWER SYMBOLS

8

9

(15) Cylinder Gp Tilt: 242-4220 Tilt (Mid Lift): 247-0497 Tilt (High Lift): 245-7491 Tilt (Logger): 245-7487

6

4

5

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

XX

TILT

3RD FUNCTION

R

(24) Accumulator - Pilot Oil: 245-2975

TO BRAKE LIGHTS

H Relief: 272-2334

QQ

F

PS

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

NC

TO TRANSMISSION CONTROL

C

C

Relief: 272-2334

Relief: 272-7003

APPLY

A1

A2

NO

Relief: 272-7003 256-2866

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

RELEASE

FRONT AXLE Port A Lever Forward Left Hand Line on Boom (When Viewed From Cab)

(ATTACHMENT)

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

(46) Switch As. - Foot Brake Limit: 105-6117 (45) Control Gp - Foot Brake: 193-1448 (53) Switch As. - Brake Pressure: 175-3244

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

Port B Lever Rearward Right Hand Line on Boom (When Viewed From Cab)

YY

1

(49) Accumulator - Service Brake: 213-8773

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

LIFT

2

3

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

(23) Valve Gp - Manual Lowering: 112-1817

F

7

PP

(25) Pump Gp - Fan: 254-5146

RAISE F

HEAD END

RACK BACK

RR

To Fan Motor LS

P

T

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

CC

RAISE

BACK

E

GG

Relief: 4T-7581

RACK

HOLD

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

REAR AXLE

PORT A

HOLD

To Case Drain Manifold

HYDRAULIC TANK

BRAKE SYSTEM

E

HOLD

DUMP

PORT B

LOWER

(8) Cylinder Gp - Steer: 163-0324

Relief: 282-4349

(12) Screen Gp: 154-2883

a1

FLOAT

(10) Valve Gp - Pilot: 147-1790

LL

KK

(7) Valve Gp - Steer: 124-8635

CROSSOVER RELIEF CYL PORT "B"

DUMP

LS D

SHUTTLE VLV

LOWER/

PORT “B”

FLOAT

Relief: 247-8632

LOAD SENSING PUMP PORT DIRECTIONAL SPOOL

(36) Valve Gp - Control: 2 Function Standard: 261-4171 2 Function W/RC: 261-3682 2 Function W/RC: 261-3683 3 Function Standard: 261-4172 3 Function W/RC: 274-8055

PILOT PORT"A"

D

(6) Valve Gp Neutralizer: 8J-1553

MAKE UP CHECK PILOT PORT"B"

LINE PATTERNS

TANK PORT

Pressure Line

QUICK COUPLER (ATTACHMENT)

30 Page, (Dimensions: 39 inches x 28 inches)

Relief: 254-5789

DR

(55) Cylinder Gp - Quick Coupler: 237-0946

RENR8879-04

CYL PORT "A"

(9) Valve Gp - Check: 111-7775

Pilot / Load Sensing Pressure Drain / Return Lines

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

TO FRONT BRAKES

TO REAR BRAKES

A1

Component Group A2

b1

Attachment

(54) Valve Gp Quick Coupler: 180-8585

MM

REGULATED PRESS. PORT TO PILOT VALVE

e1

CALLOUTS

C

PRESSURE REDUCING VALVE

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

a1

Air Line PS

NN

BACK UP RELIEF

YY

Taps (Pressure, Sampling,Sensor) by letter

52

Components by number

d1

FF

C

c1

COMMAND CONTROL STEERING ATTACHMENT

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS IMPLEMENT PUMP OUTPUT IMPLEMENT PILOT SUPPLY OIL PRIMARY STEERING PUMP CIRCUIT STEERING CIRCUIT SECONDARY STEERING CIRCUIT IMPLEMENT PUMP LOAD SENSING CIRCUIT

(56) Valve Gp Manual: 112-1817

MAIN RELIEF VALVE LOAD SENSING CIRCUIT SUPPLY LINE DRAIN / RETURN LINE LIFT CYLINDER CIRCUIT TILT CYLINDER CIRCUIT AUXILIARY CIRCUIT

F

LS (26) Motor Gp Fan: 246-6152

P

HH

BRAKE CONTROL CIRCUIT

(14) Pump Gp - Implement: 254-4108

PILOT PORT "B"

AA

EE

e1 (35) Pump Gp - Secondary Steer: 275-8544

DD

(2) Connector Orifice: 122-2340

b1

(34) Valve Gp - Secondary Steer Diverter: 141-2597

(13) Pump Gp - Steering: 241-9299

B

PILOT PORT "A"

e1 d1

CROSSOVER RELIEF CYL PORT "A"

(1) Hand Metering Unit: 230-4176

PUMP PORT

(31) Filter Gp Case Drain: 249-2334

c1

(32) Valve Gp Breaker Relief: 220-0814

BACK-UP RELIEF

MAKE-UP CHECKS

c1

HMU SUPPLY PORT

FF

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

(3) Cylinder Gp Steer: 230-4176

DIRECTIONAL SPOOL

(25) Pump Gp - Fan: 254-5146

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

A

CYL PORT "B"

Connection b1 only for Command Control Steering

SOS

(5) Valve Gp - Steer: 142-4000

PILOT CONTROL SPOOL

BRAKE CHARGE VALVE AND FAN CONTROL CIRCUIT

T

(27) Valve Gp Cooler Bypass: 244-1426

B

(4) Valve Gp - Meutralizer: 146-7571

A

HMU STEER AND 3PC IMPLEMENT 950H AND 962H WHEEL LOADER HYDRAULIC SYSTEM SCHEMATIC

d1

PART #: 241-0475 CHG 09 and BRAKE SYSTEM PART # 244-1398 CHG 00 Components are shown installed on a fully operable machine.

Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations

9

8

7

6

5

4

3

2

1