CAT 988F and 988F II Wheel Laoder Hydraulic System Schematic Manual - PDF DOWNLOAD

UENR3655 August 2012

FLUID POWER SYMBOLS

Component Location

22 19

9

32

18

42

25 27

39 23

A

D

988F II 6E-6400

1

D-1

Accumulator Gp - Brake Oil

100-6909

2

C-6

33

40

43

Cylinder Gp - Auxiliary

NOTE A

3

D-2

34

41 30 47 28

52

Cylinder Gp - Lift

9T-8257

4

D-1

Cylinder Gp - Steering

9J-8165

5

D-8 , D-9

F E

45 17

50

6

D-2

51 1 36 31

48

6

Cylinder Gp - Tilt (High Lift)

4T-6792

Cylinder Gp - Tilt (Logger)

3G-2976

Cylinder Gp - Tilt (Standard)

9J-3632

4T-4284

7

D-6

Filter Gp - Main Oil

NOTE A

8

B-6

Filter Gp - Pilot System Oil

6P-4603

9

B-6

Hydraulic Tank

9T-4971

10

B-6

11

B-6

2V-7777

Motor Gp - Fan Drive Motor (High Ambient)

110-6351

Motor Gp - Fan Drive Motor (Standard)

6E-1141

Oil Cooler

4P-4710

132-5259

Orifice

4E -0110

7I-3032

127-5801

-

Pump Gp - Fan Drive Pump (High Ambient)

6E-6425

Pump Gp - Fan Drive Pump (Standard)

6E-1229

Parking Brake

49 46 14 38

8

12

D-6

13

D-7

14

D-7

15

D-4

16

D-6

17

B-9

18

B-4

19

B-7

Pump Gp - Hand Metering (Steering)

6E-2726

119-8763

Pump Gp - Implement (Logger)

6E-5853

Pump Gp - Implement (Standard)

109-3420

143-8688

Pump Gp - Steering (Brake And Pilot)

109-3421

145-3996

Pump Gp - Supplimental Steering

3G-6856

20

B-9

-

21

C-5

Switch As - Low Brake Oil Pressure Switch

3E-6452

174-4312

22

D-6

Service Brakes

20

MAIN

Filter Gp - Fan Drive Oil

Junction Block

Switch As - Parking Brake

3E-6452

171-7085

23

C-4

Switch As - Supplemental Steering Flow

9X-0008

3E-6429

24

B-8

Switch As - Transmission Neutralizer

4E-8950

25

C-5

Valve Gp - Brake Control

9J-4080

26

C-5

Valve Gp - Brake Oil Accumulator Charging

9J-4693

27

C-6

Valve Gp - Check

104-7108

28

B-6

Valve Gp - Check

9T-4543

9T-3096

29

B-7

Valve Gp - Check

104-7108

30

B-8

31

C-1

32

D-6

Valve GP - Diverter (Ride Control Att.)

BASIC COMPONENT SYMBOLS

NOT USED

124-5752

Valve Gp - Fan Drive Make-Up (High Ambient)

110-5270

Valve Gp - Fan Drive Make-Up (Standard)

105-2470

Valve Gp - Fluid Sample

8C-3446

33

B-6

Valve Gp - Hydraulic Tank Relief

9T-0818

34

B-6

Stick Steer

9T-7426

35

C-8

21

2

53

5

24 10 44 29 11

4

Wheel Steer

8J-1553

35

C-9

SPRING

CONTROL VALVES

VARIABILITY

SPRING (ADJUSTABLE)

LINE RESTRICTION (VARIABLE)

PRESSURE COMPENSATION

ONE POSITION

Valve Gp - Lift Cylinder Head End Check

9T-3096

36

B-1

Valve Gp - Lift Cylinder Rod End Check

9T-3096

37

C-1

Valve Gp - Oil Cooler Bypass

6E-1129

38

D-7

Valve Gp - Parking Brake Control

100-8941

39

D-5

Valve Gp - Pilot (Tilt and Lift)

111-1528

40

D-3

Valve Gp - Pilot (Tilt, Lift and Aux)

111-1529

41

D-3

Valve Gp - Pilot System Relief

6E-6178

42

B-6

9T-7426

43

C-7

Valve Gp - Right Steering Neutralizer Stick Steer

8J-1553

43

C-9

Valve Gp - Selector

Wheel Steer

6E-5566

44

B-8

Valve Gp - Selector

6E-5566

45

B-5

6E-4031

139-5270

46

D-8 D-9

RESTRICTION

LINE RESTRICTION (FIXED)

PUMP (VARIABLE & PRESSURE COMPENSATED)

LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

ATTACHMENT

VALVE PORTS

THREE POSITION

TWO - WAY

THREE - WAY

CONTROL VALVES AB

PUMP (2 - SECTION)

VALVES

TWO POSITION

FOUR - WAY

CHECK VALVES

A B

P T

NORMAL POSITION

SHIFTED POSITION

BASIC SYMBOL

INFINITE POSITION

SHUTTLE

SPRING LOADED

PILOT CONTROLLED

FLUID STORAGE RESERVOIRS

988F and 988F II Wheel Loader Hydraulic System 988F: 8YG210-UP

PRESSURIZED

VENTED

RETURN ABOVE FLUID LEVEL

RETURN BELOW FLUID LEVEL

MEASUREMENT

PRESSURE

ROTATING SHAFTS

TEMPERATURE

UNIDIRECTIONAL

FLOW

988F II: 2ZR700-UP

BIDIRECTIONAL

COMBINATION CONTROLS

SOLENOID

SOLENOID OR MANUAL

SOLENOID & PILOT

SOLENOID & PILOT OR MANUAL

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

MANUAL SHUTOFF

PUSH - PULL LEVER

GENERAL MANUAL

EXTERNAL RETURN

INTERNAL RETURN

GAS CHARGED

COMPLETE

FIXED DISPLACEMENT

SINGLE ACTING

LINES JOINING

UNIDIRECTIONAL

BIDIRECTIONAL

DOUBLE ACTING

INTERNAL PASSAGEWAYS

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

INTERNAL SUPPLY PRESSURE

HYDRAULIC & PNEUMATIC CYLINDERS

HYDRAULIC MOTORS

VARIABLE DISPLACEMENT NON-COMPENSATED

SPRING

REMOTE SUPPLY PRESSURE

SIMPLIFIED

LINES CROSSING

HYDRAULIC PUMPS

PEDAL

CROSSING & JOINING LINES

ACCUMULATORS

FIXED DISPLACEMENT

PUSH BUTTON

PILOT CONTROL SYMBOLS

RELEASED PRESSURE

SPRING LOADED

21

MACHINE COMPONENT AND TAP LOCATIONS

FLUID CONDITIONER

VALVE ENVELOPES

Valve Gp - Left Steering Neutralizer

7

PUMP OR MOTOR

AUX

INFINITE POSITIONING

3 POSITION

FLOW IN ONE DIRECTION

PARALLEL FLOW

CROSS FLOW

2 POSITION

FLOW IN EITHER DIRECTION

Printed in U.S.A.

Valve Gp - Steering Control Stick Steer

8J-2318

46

Valve Gp - Steering Dual Check

Wheel Steer

6E-3723

111-7775

47

C-7

Valve Gp - Steering Pilot Control

6E-3182

143-2855

48

C-8

Valve Gp - Supplimental Steering Diverter

8J-6099

49

A-9

Valve Gp -Control (Tilt and Lift)

9T-1484

50

C-2

51

C-2

52

C-3

53

D-7

Valve Gp -Control (Tilt, Lift and Aux)

9T-1483

Valve Gp -Main Relief (Logger)

3G-3460

Valve Gp -Main Relief (Standard)

6E-2920

NOT USED

118-4297

Valve Gp - Relief

ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL)

G

M

Note A: Refer to the Parts Manual for your specific machine.

TRANSDUCER (FLUID)

TRANSDUCER (GAS / AIR)

GENERATOR

ELECTRIC MOTOR

PRESSURE SWITCH

PRESSURE SWITCH (ADJUSTABLE)

TEMPERATURE SWITCH

ELECTRICAL WIRE

Tap Location Pressure and Sampling Tap Number

Description

Schematic Location

A

Steering System

B

Brake System

D-8 , D-9 C-6

C

Pilot Pressure

B-6

D

Implement Relief Pressure

C-3

E

Tilt Head End Pressure

D-2

F

Tilt Rod End Pressure

D-2

G

Accumulator Pressure

C-5

G

ELECTRICAL SYMBOLS (ELECTRICAL)

26

T

PRESSURE SWITCH

TEMPERATURE SWITCH

LEVEL SWITCH

FLOW SWITCH

A WIRE NUMBER IDENTIFICATION CODES

C ELECTRICAL SCHEMATIC EXAMPLE

HYDRAULIC SCHEMATIC EXAMPLE

CURRENT STANDARD

27

VIEW A

HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG” WIRE CIRCUIT NUMBER IDENTIFICATION

325-AG135 PK-14

B

CIRCUIT NUMBER IDENTIFICATION

WIRE COLOR

WIRE GAUGE

325-PK

PREVIOUS STANDARD WIRE

VIEW B

SERVICE BRAKE

PILOT VALVE

B

325-PK-14

CIRCUIT NUMBER IDENTIFICATION

B

WIRE COLOR

WIRE GAUGE

A

(EXAMPLE VALVE)

(Dimensions: 39 inches x 24 inches)

16

988F NOT USED

Accumulator (Ride Control Att.)

37

Schematic Location

20 Page,

13

35

26

Machine Location

UENR3655

12

Part Number

Description

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