LEFTREAR

RIGHTREAR

48A

X

X

X

AETA VALVE

R

L

TANK GP(MAKE-UP)

VALVE GP-BRAKE (RETRACT)

ADJUSTER GP-SLACK

BRAKE GP(REAR)

LOCK-UPVALVE

P

PS

D

PUMP GP-CONV(BRAKE RETRACT)

BRAKE GP(REAR)

X

X

D37168

TO TANK (769D) (771D)TO BRAKE OIL COOLER (773D) (775D)

ELECTRONICCONTROLGROUP

MANUAL/AUTOSWITCHPANEL

MAGNETIC SWITCH AS.

10

9

8

7

5

3

12

4

6

STEERINGWHEEL

CRCL

M

BATTERY

D37169

1 Steering Hydraulic Tank Group

2 Steering Hydraulic Tank Filter

3 Steering Gear Pump

4 Electric Supplemental Steering Pump

5 Flow Control Valve Group

6 Flow Switch Assembly

7 Check Valve Group

8 Metering Pump Group

9 Relief Valve Group For Steering Cylinders

10 Steering Cylinder Group

Steering Hydraulic SystemMachine Location

Item No. Component Description

SENR8608October 1995

769D & 773D Trucks

Hydraulic System

769D:

5TR1-UP

771D

6JR1-UP

773D:

7ER1-UP

775D:

6KR1-UP

771D & 775D Quarry Trucks

©1995 CaterpillarAll Rights Reserved

Printed in U.S.A.

47

49

14

14

RIGHTREAR

18

46

111213

16

45

LEFTREAR

30

PUMPDRIVE

BOX

26

37

19

38

38

44

43

17

35

33

3223

36

27

21 20

M

24

CONVERTER

TORQUE

LOCK-UPVALVE

4 3 2 1

F

E

D

5678

F

E

D

C

B

A

4 3 2 1

C

B

A

8 7 6 5

TRANS.

HYDCONT.

40

15

39

34

29

42

41

RIGHTFRONT

LEFTFRONT

34

25

31 PT "A"

PT "B"

D37167

LINE FROM PT "A" TO TANKON 769D,771D TRUCKS ONLY

LINE FROM PT "A" TO PT "B"ON 773D,775D TRUCKS ONLY

28

22

11 Hydraulic & Transmission Tank B-3

12 Hoist Control Valve Group B-4

13 Relief Valve Group B-4

14 Hydraulic & Transmission Tank Screen Assemblies C-3,C-4

15 Hydraulic Tank Screen Group C-4

16 Hoist Gear Pump Group C-5

17 Hoist Telescoping Cylinder Group A-4

18 Screen For Oil Cooler B-5

19 Oil Cooler Core Group B-5

20 Converter Scavenge Gear Pump Group E-6

21 Converter Charge Gear Pump Group E-6

22 Brake Retract Gear Pump Group D-6

23 Brake Retract Filter D-6

24 Brake Retract Valve Group E-6

25 Converter Filter and Sump Group D-7

26 Orifice Plates A-4

27 Converter Outlet Relief Valve Group D-7

28 Converter Inlet Relief Valve Group C-6

29 Pump Drive Group C-6

30 Torque Converter Group D-7

31 Lock-up Clutch Valve Group D-7

32 Rear Brake Master Cylinder D-8

33 Slack Adjuster Group For Rear Brakes D-8

35 Electric Supplement Brake Retract Pump A-6

36 Hydraulic Tank For Brake Make-up F-6

37 Front Brake Master Cylinder E-2

38 Hydraulic Caliper Service Brake Groups B-1, E-1

39 Transmission Charge Pump Group D-3

40 Transmission Scavenge Gear Pump Group D-3

41 Transmission Filter Group D-3

42 Electrical Switch For Transmission Filter Bypass D-3

43 Oil Cooler Core Assembly D-2

44 Cooler Inlet Valve Group D-2

45 Transmission Tank Air Breather C-3

46 Air Filter And Breather C-4

49 Check Valve Group E-6

47 Diverter Valve Group For Manual Parking BrakeRetraction A-5, A-6

48A Hydraulic Control Group For Manual Parking BrakeTraction Aid (Attachment)

34 Parking And Service Brake Group For Left AndRight Rear Wheels A-8, F-8

Hydraulic System For Power Train, Hoist And BrakesMachine Location

Item No. Component Description SchematicLocation

24

34

2617

28

25

424110

222120

48A

33

47

34

2617

1514131211

32

3637

164039 38

35

10

4

49

46

7

45

8

65

9

43

44

27

21

18

30

29

23

3

31

19

38

D37165

49

34

24

2617

42

23

28

2510

222120

48A

33

47

34

2617

1514131211

32

3637

164039 38

35

10

4

46

7

45

8

65

9

43

44

27

2

41

1

18

30

29 3

31

19

38

D37166