773 and 775E Off-Highway Truck Hydraic System 31072003

FLUID POWER SYMBOLS 37

Media Number Power Train RENR6507

Systems Operation

RENR6508

Testing and Adjusting

RENR6509

Disassembly and Assembly

SENR1574

12

50 49 48

53 52 51

57

41

4

40

3

47

1

32

PUMP or MOTOR

RENR6516

Specifications: (Steering System)

RENR6510

Testing & Adjusting: (Steering System)

RENR6511

Specifications: (Air System & Brakes)

RENR6512

Testing & Adjusting: (Air System & Brakes)

RENR6513

Specifications, Systems Operation, Testing & Adjusting: (Oil Evacuation System)

RENR3391

Specifications, Systems Operation, Testing & Adjusting: (Suspension Cylinder)

RENR6514

Electrical System

JJ

LINE RESTRICTION (VARIABLE and PRESSURE COMPENSATED)

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

VALVES

35

VALVE ENVELOPES

PP

VALVE PORTS

21

28

33 30 29 GG

RENR6518

58 RR 59

27

26 FF 62 20

24 23 22 DD

19 24 QQ

CC

18

31 12

60

2

BB

17 AA 11

9

10 16 15

8

7

6

5

4

3

MM NN

1

38 39 36 42

61 34 37

LL

45 46 56 55

KK

43 44

11

2

10

15 16 51 52 53 54 32 41

48

28

47

Item 1

EE SENR2986

60

Tap Locations Pressure, Sampling, and Sensor

Part Number

BB

Pressure Tap (Lockup Clutch Maximum Pressure)

B-12

CC

Sampling Valve (Torque Converter Pressure)

C-11

DD

Oil Sampling Valve (Brake)

EE

Pressure Tap (Transmission Lubrication Pressure)

G-8 / H-2

FF

Pressure Tap (Rear Brake Service)

F-12

GG

Pressure Tap (Torque Converter Pressure)

C-13

HH

Pressure Tap (Parking Brake)

D-12 D-11

JJ

Pressure Tap (Brake Cooling)

KK

Pressure Tap (Steering)

E-2

LL

Sampling Valve (Steering Oil)

B-3

MM

Pressure Tap (Hoist Cylinder - Head End)

D-8

NN

Pressure Tap (Hoist Cylinder - Head End)

D-8

PP

Scheduled Oil Sampling Valve (Engine Oil)

G-9

QQ

Pressure Tap (Front Brake)

L-7

RR

Pressure Tap (Transmission Control)

W-7

PP

TWO-WAY

THREE POSITION

FOUR-WAY

THREE-WAY

21

29

32

138-4733

Check Valve (Parking Brake Release)

33

123-5150

Check Valve

B-7

3

145-5155

Hoist Cylinder

D-8

35

104-1817

Oil Cooler (Power Train)

C-12

4

8X-3572

Plate (Orifice)

D-8

36

9T-5665

Hydraulic Filter (Steering)

G-3

5

8P-3795

Screen

A-11

37

8X-6987

Air/Hydraulic Cylinder (Front Brake)

H-7

6

9P-0673

Relief Valve (Torque Converter Inlet)

A-10

38

170-8018

Hydraulic Tank (Steering)

B-3

7

111-6841

Transmission Charging Pump Section

A-12

39

9T-0818

Steering Pump Case Drain Filter

B-3

8

111-6841

Transmission Scavenge Pump Section

A-12

40

3G-2887

Diverter Valve (Towing)

9

8P-3795

Screen

A-13

41

8X-4575

Air Breather (Hoist and Brake)

111-8399

Brake Pump Section

G-8 / H-1

42

9P-0673

Air/Hydraulic Cylinder (Rear Brake)

G-12

11

111-8399

Hoist Pump Section

G-8

43

Check and Relief Valve (Steering)

D-2

44

Relief Valve (Primary Steering Backup)

D-2 D-2 D-3

Steering Cylinder

F-2

175-7050 F-5 / H-5

45

Relief Valve (Secondary Steering Backup)

E-2

46

Pressure Reducing Valve (Steering)

8W-7374

Hydraulic Caliper Service Brake (Front)

14

192-4286

Metering Pump (Steering)

15

219-1964

Piston Pump (Steering)

G-8 / C-2

47

113-1543

Brake Valve (Parking and Secondary)

16

219-1964

Pressure Compensator Valve

C-2

48

153-2739

Hydraulic Tank (Hoist and Brake)

17

212-0394

Lockup Clutch and Solenoid Valve (Torque Converter)

B-12

49

9T-9227

Screen

D-9

18

132-5447

Hydraulic Filter (Power Train)

B-11

50

7J-3723

Screen

D-9

19

132-5448

Hydraulic Filter (Parking Brake Release)

G-8 / H-2

51

Control Valve (Hoist)

E-6

*194-1465

Proportional Solenoid (Hoist – Raise)

E-7

**175-7852

Relief Valve (Brake Oil Cooler)

E-7

Proportional Solenoid (Hoist – Lower)

F-7

8J-6875

Shuttle Valve (Resolver Valve – Steering)

D-2

52

21

9Y-1911

Oil Filter (Engine)

B-8

53

D-2 B-7 G-10

54

Brake Release Section of the Electric Drive Pump Secondary Steering Section of the Electric Drive Pump

175-7051

Load Sensing Valve Relief Valve (Secondary Steering – Main)

D-2

H-10

143-9426

Makeup Tank (Brake)

56

3E-6450

Pressure Switch (Steering Pump Oil)

D-3

Torque Converter Housing

A-13

26

2G-6535

Slack Adjuster (Rear)

F-12 / G-3

58

27

8P-1471

Relief Valve (Torque Converter Outlet)

C-13

59

28

9G-9208

Traction Control Valve

G-1

60

29

141-4109

Oil Cooler (Rear Brake)

F-11

30

6E-6640

Screen

F-10

31

209-3406

Prelubrication and QuickEvac Section of the Electric Drive Pump

212-0394

MEASUREMENT

PRESSURE

773 and 775E Off-Highway Truck Hydraulic System BDA259-UP BEC202-UP

35

33

23 22

18 13

12

27 17

25 31

CC

QQ

GG

57

8

9 24 49 50

40

3

58 59 RR

BB

1

54

BIDIRECTIONAL

RETURN ABOVE FLUID LEVEL

PRESSURIZED

RETURN BELOW FLUID LEVEL

COMBINATION CONTROLS

Transmission Hydraulic Control

B-11 A-11

200-5375

Power Train Electronic Control Module (ECM)

C-1

61

212-0394

Relief Vavle (Vacum Breaker)

C-1

62

9X-4455

Pressure Switch Assembly

C2

SERVO

SOLENOID and PILOT or MANUAL

SOLENOID and PILOT

DETENT

THERMAL

PEDAL

PUSH BUTTON

GENERAL MANUAL

SPRING

PILOT CONTROL SYMBOLS

I-11

Transmission Housing

SOLENOID or MANUAL

RELEASED PRESSURE

EXTERNAL RETURN

REMOTE SUPPLY PRESSURE

INTERNAL RETURN

ACCUMULATORS

SPRING LOADED

GAS CHARGED

SIMPLIFIED

CROSSING AND JOINING LINES

LINES CROSSING

LINES JOINING

INTERNAL SUPPLY PRESSURE

COMPLETE

HYDRAULIC AND PNEUMATIC CYLINDERS

SINGLE ACTING

DOUBLE ACTING

B-6 / G-10

HYDRAULIC PUMPS FIXED DISPLACEMENT

VARIABLE DISPLACEMENT NON-COMPENSATED

HYDRAULIC MOTORS FIXED DISPLACEMENT

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

INTERNAL PASSAGEWAYS INFINITE POSITIONING

FLOW IN ONE DIRECTION

TWO POSITION

THREE POSITION

PARALLEL FLOW

CROSS FLOW

FF

Printed in U.S.A.

© 2003 Caterpillar All Rights Reserved

52 G704-YL E790-PK

10

15

47

11

Steering Metering Pump (14) Hoist Control Valve

23

Pump and Motor for the Secondary Steering, Brake Release, Prelubrication, and QuickEvac Downshift Solenoid 704-GY 922-BR

Upshift Solenoid 703-BU 922-BR

Transmission Hydraulic Control (58)

Parking and Secondary Brake Valve (47)

Main Pump

31

22

FLOW ALLOWED IN EITHER DIRECTION

26

Machine Component and Tap Locations

G705-GN E790-PK

VENTED

PUSH-PULL LEVER

7 4

UNIDIRECTIONAL

MANUAL CONTROL SYMBOLS

30

6

FLOW

TEMPERATURE

SOLENOID

(**) 775E Only

5

ROTATING SHAFTS

FLUID STORAGE RESERVOIRS

(*) 773E Only

19

SPRING LOADED

BASIC SYMBOL

D-9 / D-10

55

57

INFINITE POSITION

E-9

13

20

P T SHIFTED POSITION

P T NORMAL POSITION

G-10

10

105-3357

CHECK VALVES

AB

AB

H-10 / H-2

B-10

12

CONTROL VALVES

Schematic Location

9C-4937

25

62 20

F-3, I-3 D-12 , I-12

Description

2

24

B-10

Item

Air Breather (Torque Converter and Transmission)

23

14

Part Number

Schematic Location

Service and Parking Brake (Rear)

209-3406

Schematic Location

Description

2A-7070

22

G-8

TWO POSITION

ONE POSITION

Component Locations

14

14

PRESSURE COMPENSATION

LINE RESTRICTION (VARIABLE)

SPRING (ADJUSTABLE)

VARIABLILTY

34

31 25

Additional Manuals

Pressure Tap (Hoist)

PUMP: VARIABLE and PRESSURE COMPENSATED

2-SECTION PUMP

Hoist and Brake Hydraulic Tank Selector Solenoid (4 Way)

Proportional Solenoid Valve

774-YL K952-BR 775-BR K952-BR

773-GY K952-BR

43

Steering Check and Relief Valve (43)

Traction Control Valve

Steering Hydraulic Tank

Lockup Clutch Solenoid

Transmission Rear View

26

40

705-PK 922-BR

Diverter Valve (Towing) (40)

Slack Adjuster Rear Brake (26)

30 Page, B/W, D.G.M.

Testing & Adjusting: (Hydraulic System)

AA

LINE RESTRICTION (FIXED)

RESTRICTION

RENR6506-00

RENR6515

Description

CONTROL VALVES

SPRING

FLUID CONDITIONER

HH

Specifications: (Hydraulic System)

Tap Number

BASIC COMPONENT SYMBOLS MAIN AUX.

54

39 38

Machine System

Automatic Electronic Traction Aid (AETA)

55 13

36 61

Specifications

Schematic: (Electrical System)

42

56

LL KK

Related Manuals Description

46 45 44 43

RENR6506-00 July 2003

13

12

11

10

9

8

7

6

5

4

3

2

1

47 I

I

55 37

13

47

32

10

1

H

H

1 42

26

32

DD 19 15

22

23

19 Selector (4 Way) Solenoid

10

Proportional Solenoid

DD M

G

G

1 31 40

11

AA

28

F

F

Traction Control System

13 54 26

12

FF

29

14

30 52

E

53

E

1

50

HH

KK 46

41

62

56

24 MM

NN

22

30 Page, Color 2, DGM

RENR6506-00

20

31

4

48

JJ

60

D

43

51

49

44

D

M

45 25

3

23

ECM

Main 61 C

15

27

C

16

CC 35

36 17 GG

33

21

EE

31

18

LL 2

B

23

58

7

39

22

B

38

BB

Steering Hydraulic System

M HYDRAULIC CIRCUIT COLOR DESCRIPTIONS Pump Output (Brake) (Hoist) (Steering).

57

Pump Output (Brake Release) (Secondary Steering) (Prelube and Quickevac).

6 8

A

5

59

Torque Converter and Transmission Hydraulic System 11

Pilot/Load Sensing Pressure

A

Supply Line. Drain/Return Line. Brake Circuit. Engine Prelube and Quickevac Circuit. Steering Circuit. Torque Converter/Transmission Circuit. Hoist Circuit. Traction Control Circuit.

Engine Prelubrication and Quickevac

12

Pressure Line

Pump Output (Transmission).

9

13

LINEAR PATTERNS

Drain / Return Lines Components

THIS SCHEMATIC IS FOR THE 773E and 775E OFF HIGHWAY TRUCK Components are shown installed on a fully operable machine with the key and engine off and transmission shifter in neutral.

10

9

8

7

6

5

4

3

2

1