950h

RENR8879-03 September 2009

B

C

28

31

BASICCOMPONENTSYMBOLS MAINAUX.

PUMPorMOTOR

E

VARIABILITY

J

SPRING (ADJUSTABLE)

B F

49

G NN

BOTTOM VIEW

6

THR EEPOS I TO I N

TWO-WAY

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

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

- 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:

PRESSURE

I N FNI I T E P O STI I O N

BASIC SYMBOL

SPRING LOADED

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

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

FLOW

TEMPERATURE

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

IT62H: M5G1-UP

V ENT E D

UNIDIRECTIONAL

BIDIRECTIO N AL

RETURNABOVEFLUIDLEVEL

P R E S S U RI E Z D

RETURNBELOWFLUIDLEVEL

COMBINATIONCONTROLS

SOLENOID

SOLENOID or MANUAL

SOLENOIDand PILOTor MANUAL

SOLENOID and PILOT

SERV O

A

PUSH-PULL LEVER

MANUALSHUTOFF

B

EE

G

KK

GE NERAL MANUAL

PUSH BUTTON

C

L E

D

C H

K H

F

Description

Part Number

Schematic Location

HMU STEERINGCIRCUIT 1

Hand M et ering Un it

230-417 6

A-4

2

C onnector -O -Orif cie

122-2340

B-3 ,B ,B-4

3

C ylinder Gp -S -Ste er

163-0324

B-1

4

Valve Gp -N -Neu rta izl er

146-7571

B-3 ,B ,B-4

5

Valve Gp - Steer

142-4000

6

Valve Gp -N -Neu tra lizer

8J-1553

D-3

Valve Gp - Steer

124-863 5

D-1

8

Cylinder Gp -S -Ste er

163-032 4

E-1

9

Valve G p - Che ck

111-7775

D-3

10

Valve Gp - Pilot

147-1790

D-4

11

Valve Gp - Shuttle

8J-6875

C-3

12

Scree n Gp

13

Pump G p -S -Steering

241-9299

14

Pump Gp -I -Imple ment

254-4108

154-2883

E-2

MAIN SCHEMATIC

15

A-6 A-7

Cylinder -T -Tilt

242-4220

F-8

C yli nd er - Til t(t(M di Li Li tf )

2 47 0- 49 7

F 8-

C yl ni de r -T -T li t H ( gi h Li tf )

2 45 7 - 49 1

F 8-

C yli nd er - Til t(t(L og ge )r

2 45 7- 48 7

F 8-

20

Cylinder -L -Lift L( H)

242-427 2

F-7

21

Cylinder -L -Lif t R ( H)

242-427 1

F-7

22

Valve -C -Ch oke Check

276-9072

D-9

2 3

V al e v Gp Gp - Ma nu al Lo Lo we irn g

24

Accumula ot r -P -Pilot Oil

25

Pump Gp - Fan

26

Mo tor Gp - Fan

1 12 1- 81 7 245-2975 254-5146 246-6152

30

M an fi ol d Gp - Fa Fa n &B ar ke C ha g r e

2 42 1 - 30 7

C8 -

31

Filter Gp -C -Case Drain

249-2334

A-8

3 2

Valve Gp -B -Brea e k rRe iel f

220-0814

A-8

3 3

Tan kGp -H -Hydraulic Oil

237-274 2

A-8

36

1 41 -2 59 7

A- 6 D 9-

2 61 3- 68 2

D 9-

ValveGp-Control (3Function)

2 61 4- 17 2

D 9-

ValveGp-Control (2Function W/RC)

2 61 3- 68 3

D 9-

ValveGp- Control (SnowRemoval) (3Function W/RC)

2 74 8- 05 5

D 9-

41

A c um ul at or - Ri de C on rt ol( R C)

2 45 2 - 97 3

F6 -

4 2

Va vle Gp Gp - Co nt or l& R el ei f

2 63 5- 83 2

C 7-

43 5 4

Motor Gp -R -R eversing Fa n Va vle Gp - Q ui kc Co Co up el r

228-8527 1 80 8- 58 5

C-6 C 9-

5 5

C yl ni de r G p - Q ui kc Co Co up el r

2 37 0- 94 6

C 9-

56

Valve Gp - Manua l

112-18 17

C-9

25

Pump Gp - Fan

254-5146

F-2

30

M an fi ol dG dG p -F -F an &B r ak e Ch ar ge

2 42 1 - 30 7

F2 -

BRAKESYSTEM

45

Co ntrol Gp -F -Foot Brake

193-1448

F-3

4 6

S wit ch As As - Fo ot Br Br ak eL eL m ii t

1 05 6- 11 7

F 3-

4 7

Sensor Gp -F -Foo tB tBrake

48

215-3687

F-3

A c um ula o t r- Se Se vri e c Br Br ak e

2 13 8- 77 3

F 2-

A tc ua ot rA rAs - Pa kr ni gB gBr ak e

1 29 8- 09 0

F 1-

5 1

Valve Gp -P -Parking Brake

106-177 4

F-2

52

S wi tc h As - P ar ki ng B ra ke P e r ss ur e

1 74 -4 31 2

F -1

5 3

S wit ch As As - Bra ke Pr Pr es u s er

1 75 3- 24 4

F 3-

CC

Schematic Location

Fan Pump Discharge Pressure

B-8

C C

I m p el m e nt Pu mp Ch Ch arg eP ePr es u s er

E-9 E 9-

DD

I mp el me nt Pu Pu mp L oa d S e ns e P r es su e r

B 7-

EE

Ste er Pump Pressure S et er Pu Pu mp L oa d Se ns e Pr es su e r Pilo t Sup ply Pressure

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

IMPLEMENT CONTROL VALVE

26

31

43

49

RR

Rear Service Bra ke Pressure

F-4

XX YY SOS

Tilt Cylind er Ro dE dEn dP dPressure

F-8 B-9

Wire Color

325-PK-14

VIEW A - A

B

45 46

20

47 48

21

15

A

Wire Gauge (EXAMPLEVALVE )

15 1 20

21

27

25

FANAND BRAKEHYDRAULICSYSTEM 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 providesoilflow for the electronicdemand fan systemand he ht e brake hydraulicsystem. The outlet pressure tap (AA) islocated on the fan and brake pump.

45 46

2643

47 48

HH 3

3

8 25 3 0 1 3

50 51

34

25

13

53

52

35

30

14

42

53

14

REAR VIEW

3

50

8

5

7

2

51

12 23

4

49 52

28 31

6

9

10

22 24

8

11

36 41

2 4 6

5 7 10

9

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.

2

11 12 22

4

24 36 41

6

30

FRONT VIEW

F-8

Tilt Cylind er He ad End Pressu er Hydraulic Oil Sampling Port

W ri eG au ge

Previous Standard

23 35

D3 -

W ri e C ol or

Wire

42

D-3

F-4

Wire Color

325-AG135 PK-14 Circuit Identification Number

HMU & SERVICE BRAKES

1

B-7

F-3

Current Standard Wire Circuit Number Identification

Circuit Number Identification

D2 -

C om ma nd C o nt ro lL e tf S te er P li ot P re ss ur e

Hydraulic Schematic Example

TILT CYLINDER LINES GROUP

34

C om ma nd C o nt ro lS t ee ri ng S up pyl P e r ss ur e

Flow Symbol

Level Symbol

325-PK

E-5

Fron tS tService Brake Pre sure

ElectricalWire

Temperature Switch

Current Standard

- 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)

A 4- o rC rC 4 -

Service Brake Pre ssure

YY

Thefollowingcomponentsarelocatedunder thefrontofthe cab. This drawing shows a right side viewof the wheelloader. The following components can be seen in this view:

D2 -

C o mm a nd C o n rt o lS t ee rni g N e ut r al P iol t P r es s

Electrical Schematic Example XX

15

B-8

LL

Temperature Symbol

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

Fan Pump Lo ad Sense Pressure

PP

Electric Motor

Wire Number Identification Codes

C om ma nd C o n rt ol R g i ht S te er P li ot P e r ss ur e

QQ

Generator

T

Pressure Symbol

RIGHT SIDE VIEW

1

QQ

KK

NN

Pressure Switch (Adjustable)

PressureSwitch

FF

HH

MM

Transducer (Gas / Air)

RR

28

AA

M

G Transducer (Fluid)

48

3233

FF

Hydraulic Symbols (Electrical)

DD

33 32

GG

FLOWALLOWEDIN EITHERDIRECTION

Electrical Symbols (Electrical)

27

Tap Locations Pressure, Sampling, and Sensor Description

TWO POSITION

CROSS FLOW

PARALLEL FLOW

FLOWINONE DIRECTION

Electrical Symbols Table

YY

15

F-3

Valve Gp -F -Foot Brake

4 9 5 0

Tap Number

THREE POSITION

Printed in U.S.A.

B6 -

2 75 8- 54 4 2 61 4- 17 1

214-4863

XX

SERVICE CENTER

E- 9

B-9 B-9

V al ve G p - Se co nd ar y St ee r Di ve rt er

- 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)

B-8

244-1426 244-1031

P um pG pG pp- Se co nd ary St ee r ValveGp-Control (2Function Standard) ValveGp-Control (2FunctionW/RC)

BIDIRECTIONAL

INFINITE POSITIONING

© 2009 Caterpillar © 2009 AllRights Reserved

- 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)


D-6

Valve Gp -C -Coo el r Bypass Filter Gp -R -Return Oil

3 5

UNIDIRECTIONAL

BIDIRECTIONAL

DOUBLEACTING

INTERNALPASSAGEW AYS

VARIABLEDISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL


- Implement controlvalve supply pressure tap (GG)

F-5

27 28

34

This photo shows a left rear viewof the implement controlvalve (36). The following components can be seen in this view:

B-2

COMMAND CONTROLSTEERING 7

FIXED DISPLACEMENT

INTERNAL SUPPLYPRESSURE

COMPLETE

SINGLEACTING

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

ComponentLocations Item Number

SPRING

HYDRAULICANDPNEUMATICCYLINDERS

LINESJOINING

HYDRAULICMOTORS

VARIABLEDISPLACEMENT NON-COMPENSATED

K

J

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

G

LINESCROSSIN G

HYDRAULICPUMPS

E

J

SIMPLIFIED

CROSSINGANDJOININGLINES

GASCHARGED

FIXED DISPLACEMENT

CC

COMMAND CONTROL STEERING

INTERNALRETURN

SPRING LOADED

L

RIGHT SIDEMACHINEVIEW

PEDAL

REMOTESUPPLYPRESSURE

ACCUMULATORS

M

D

M

12

LL

DE TENT

PP EXTERNALRETURN

B

THERMAL

MANUALCONTROLSYMBOLS

PILOT CONTROLSYMBOLS

F A

PILOT CONTROLLED

ROTATING SHAFTS

RELEASEDPRESSURE

N

SHUTTLE

FLUIDSTORAGERESERVOIRS

950H, 962H and IT62H Wheel Loader H y d r a u l ic ic S y s t e m


- 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)

FOUR-WAY

THREE-WAY

CHECKVALVES

AB

PT SHIFT E D P O S I TOI N

MEASUREMENT

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

ATTACHMENT

LINERESTRICTION VARIABLEand PRESSURE COMPENSATED

VALVE PORTS

CONTROLVALVES

PT NORMALPOSITION

24

GG

HYDR A U LCI PNEU M A TCI ENERGYTRIANGLE S

VALVES

T W OP O STI I O N

ONEPOSITION

C

A

PUMP: VARIABLEand 2-SECTIONPUMP PRESSURECOM PENSATED

LINERESTRICTION (FIXED)

RESTRICTION

PRESSURE COMPENSATION

LINERESTRICTION (VARIABLE)

VALVE ENVELOPES

AB

H

CONTROLVALVE S

SPRING

FLUIDCONDITIONER

D

K MM

FLUID POWER SYMBOLS

SOS

A

10

Machine Component Locations

FAN & BRAKE PUMP

3 0 9 7 e 8 g a 8 P 0 3 R N E R

8

9

7

6

4

5

3

2

1

41

49 FRONTAXLE

15

51

TILT

20

XX

21

LIFT

23

APPLY

50

52

46

3RDFUNCTION

F

RELEASE

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

(ATTACHMENT)

YY R

47

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

53

TOBRAKE LIGHTS

24

H

TO TRANSMISSIONCONTROL

A2

F

30

PS

45

HITCH

A1

NO

QQ

NC C

25

C

PP

RR

48

RACK BACK

RAISE HEAD END

F To Fan Motor P

LS

T

RACK

CC

E

BACK

RAISE

HOLD

HOLD

HOLD

LOWER

PORT B

PORT A

DUMP

HYDRAULIC TANK

To Case Drain Manifold

REARAXLE

BRAKE SYSTEM

GG

E

12

8 8 7

a1

FLOAT

10

CROSSOVER RELIEF

KK

LL

CYL PORT "B"

CYL PORT "A" SHUTTLEVLV

LOWER/ DUMP

LOADSENSING PUMPPORT

ROD END

FLOAT

DIRECTIONAL SPOOL

LS D

DR

PILOT PORT"A"

36 6

LINE PATTERNS

QUICK COUPLER (ATTACHMENT) 55

55

PILOT PORT"B"

b1

PressureLine Pilot / Load Sensing Pressure

A1

TO REAR BRAKES

NN

MM

9

TANKPORT

BACKUP RELIEF

PRESSURE REDUCING VALVE

Drain / Return Lines TO FRONT BRAKES

30

ComponentGroup A2

Attachment

a1

Air Line PS

3 0 - 2 9 r o 7 l o 8 C , 8 e g a R P 0 N 3 E R

D

MAKEUP CHECK

C

YY

Taps (Pressure,Sampling,Sensor)byletter

52

Components by number

c1 FF

C

d1

56 56

REGULATED PRESS. PORT TO PILOT VALVE

11

e1

CALLOUTS

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

COMMAND CONTROL STEERING ATTACHMENT

IMPLEMENT PUMP OUTPUT

54

IMPLEMENT PILOT SUPPLY OIL PRIMARY STEERING PUMP CIRCUIT STEERING CIRCUIT SECONDARY STEERING CIRCUIT

5

PILOT CONTROL SPOOL

IMPLEMENT PUMP LOAD SENSING CIRCUIT

PILOT PORT "B"

CYL PORT "B"

MAIN RELIEF VALVE LOAD SENSING CIRCUIT SUPPLY LINE

F

56

4

DRAIN / RETURN LINE LIFT CYLINDER CIRCUIT TILT CYLINDER CIRCUIT AUXILIARY CIRCUIT

P

LS

HH

26

4

BRAKE CHARGE VALVE AND FAN CONTROL CIRCUIT

T

3

BRAKE CONTROL CIRCUIT

25 Connection b1 only for Command Control Steering

B

b1

PILOT PORT "A"

EE

14 27

e1

AA SOS

B

2

34

CROSSOVERRELIEF

e1 d1

CYL PORT "A"

DIRECTIONAL SPOOL PUMPPORT

DD

1

28

MAKE-UPCHECKS

35 32

31

BACK-UPRELIEF

c1

HMUSUPPLYPORT

c1

FF

A

A

HMU STEER AND 3PC IMPLEMENT THISSCHEMATICISFORTHE950HAND962HWHEELLOADER

13

33

PART#: 241-0475 CHG 09 and BRAKESYSTEM PART# 244-1398 CHG 00 Components are shown installed on a fully operable machine with the key and engine off and transmission shifter in neutral.

d1 9

8

7

6

5

Refer to theappropriate Servic e Manualfor Troubleshooti ng, Specifications and Systems Operations

4

3

2

1

950h

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