777d Hydraulics

42

47

44

43

38

18

40

RENR8431 January2007

FLUID POWER SYMBOLS BASICCOMPONENTSYMBOLS

PUMPorMOTOR

48 1

21

6

11

8

5

21

15

FLUIDCONDITION ER

S P IRN G

SPRING (ADJUSTABLE)

LINERESTRICTION (VARIABLE)

C O TNR L OV A LV ES

RESTRICTION

MAINAUX. PUMP:VARIABLEand 2-SECTIONPUMP PRESSURECOMPENSATED

LINERESTRICTION (FIXED)

50

 AA

VARIABILITY

13

PRESSURE COMPENSATION

T W OP O S I ITO N

THR E EP O ISTO I N

 ATTACHMENT

   )   s   e    h   c   n    i    5    3   x   s   e    h   c   n    i    8    4   :   s   n

VALVE PORTS

TWO-WAY

FOUR-WAY

THREE-WAY

CONTROL VALVES  AB

LINERESTRICTION VARIABLEandPRESSU RE COMPENSATED

VALVES

VALVE ENVELOPES

ONEPOSITION

H Y DA R U LCI P N EM U ATIC ENERGYTRIANGLES

CHECK VALVES

 AB

PT NORMALPOSITION

PT S H I FETD P O S IITO N

I N F I NTI E P O IST I O N

BASIC SYMBOL

SPRING LOADED

S H U T E L

   1    3    4    8    R   o    i   s    N  n   e   m    E    i    D    (    R  ,   e

P LI O T CONTROLLED

FLUIDSTORAGE RESERVOIRS

V E N E T D

22

RETURNABOVEFLUIDLEVEL

P R E S S U R ZI D E

RETURNBELOWFLUIDLEVEL

MEASUREMENT

PRESSURE

TEMPERATURE

ROTATING SHAFTS

FLOW

U N I D I R E C T OIN L A

B DI RI C E IT O N LA

COMBINATIONCONT ROLS ROLS

SOLENOID

SOLENOID or MANUAL

34

SOLENOID andPILOT

777D Off-Highway Truck Hydraulic System FKR1-UP

SOLENOIDand PILOTor MANUAL

SERVO

THERMAL

DETEN T

MANUALCONTROLSYMBOLS

PUSH -PULL LEVER

42

MANUALSHUTOFF

RELEASEDPRESSURE

24 6

EXTERNALRETURN

44

4

1

21

11

INTERNALRETURN

 ACCUMULAT ORS ORS

6

25

SOS

34

16

SPRINGLOADED

GASCHARGED

HYDRAULICPUMPS

18

COOLER LINES

STEERING LINES

PUSH U B TTON

PEDAL

SPRING

  g   a    P    6    3

REMOTESUPPLYPRESSURE

SIMPLIFIED

CROSSINGANDJOININGLINES

INTERNAL SUPPLYPRESSURE

COMPLETE

HYDRAULICANDPNEUMAT ICCYLINDERS ICCYLINDERS

42

FIXED DISPLACEMENT

SERVICE SERVIC E BRAK ES

GENERAL M ANUAL

PILOTCONTROLSYMBOLS

TORQUE CONVERTER

VARIABLEDISPLACEMENT NON-COMPENSATED

LINESCROSSING

LINESJOINING

SINGLEACTING

HYDRAULICMOTORS FIXED DISPLACEMENT

VARIABLEDISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

DOUBLEACTING

INTERNAL PASSAGEWAYS INFINITE POSITIONING

FLOW IN ONE DIRECTION

THREE POSITION

PARALLEL FLOW

CROSS FLOW

TWO POSITION

FLOWALLOWEDIN EITHERDIRECTION

© 2007 Caterpillar, All Rights Reserved

PPrintedinU.S.A. rinted n i U.S.A.

Component Locations  

Description

Part Machine Number  Location

Schematic Location

SteeringComponents Cyl ni der Gp - Steering

300-0239

1

I-2 to to II-3

Filter Gp Gp - Pum pC pCas eD eDrain

173-0159

2

E-3

Filter Gp -S -Steerin g

144-0832

3

E-4

Pump Gp -M -Meterin g

195-6617

4

H-3

P um pG pG pp- St St ee ir ng (P (P ir ma yr )

2 19 1 - 96 5

5

F3 -

P um pG pG pp- St St ee ir ng (S (S ec on da y r)

1 75 7 - 05 1

6

G- 2

S wi ct h As ..- Pr Pri ma y r Lo Lo wP wP e r ss . Tank Gp G p - Steering

3 E- 64 50 242-1137

7

G- 3

8

E-3

Valve Gp - Break er

9T-0818

9

F-1

Valve Gp - Chec k

175-7050

10

G-3

Valve Gp - Shuttle

8J-6875

11

G-2

 AA 18

56

40

52

2

9

BB

31

Electrical Symbols Table

3

7

6

29

8

10

11

14

55 1

46

48

49

34

33

30

28

5   2 3 5 4 1 3 26 21

Hydraulic Symbols (Electrical)

22

47

15

Transducer  (Gas / Air)

PressureSwitch (Adjustable)

Pressure Switch

ServiceAnd Parking Brakes, BrakeCooling and Hoist  AdjusterGp -Front BrakeSlack

8X-7921

 AdjusterGp -Rear BrakeSlack

2G-5900

13

BrakeGp-FrontServiceBrakes   OilCooled: 8X-3810   DryDisc: 125-1384

14

12

E-5

15

8X-457 5

16

E-7

Converter Gp -T -T/C

290-3651

17

D-8

1 41 4 - 10 9 1 41 -4 10 9

18

F -1 0 G-6

300-0688

21

F-9

C yl in de r Gp - R ea r Br ak e Ma st er

1 37 -0 27 9

22

G1 - 3

Dri ve Gp - Pump Dr Drive Bo Box

169-9010

Filter Gp Gp - Brak eR eRetrac t

172-3889

24

Filter Gp -T -T/C Charge

4 T-476 0

25

D-9

Manifold

5T-5533

26

F-11

122-7765

27

I-10

Orific e Plate Orific e Plate

E l ec t r c i a lS c he m at i c E x am p l e

12

1

14

25

38

43

32

16

24

50 35 20

41 44

36

54 21

45

37

28

42

19

28 29

C-5

39

8E-3 883

30

C-9

27

31

C-11

Pump Gp - Hois t

2 30-7132

33

C9 -

3T-8098

34

C-9

Pump Gp -T - T/C Scav enge

3T-8098

35

C-9

Screen

7J - 372 3

36

C-7, C-8

Screen

7J-0725

37

C-8

Screen

9T-1460

38

Screen

6E-5066

39

I-11

Screen

6E-6 640

40

F-1 0

Tank Gp - Brake Ma Mak eU eUp

143-9426

41

H-10

42

B -7 t o B- 9

35 2

F-1 0

15

1 13-1 543

44

H-11

Valve Gp - Chec k

1 38-4 732

45

G-11

V al ve G p - Di ve rt er - M an . Rt rc t.

3 G- 28 87

46

C1 - 1

V al ve Gp Gp - Ho si t Co nt o r l

2 45 1 - 66 8

47

F7 - to to HH-7

6I-94 76

49

D-9

Valve Gp Gp - T/C Outlet Re Relief

3P-0349

50

4

6

7

B

8

52

31

40 10

38

9  AA

56

11

BB 18

19

43

52 32

24

CC

27

30

32

34

55 54

19

5 23

DD

45 39 20

57

21 51

44

D-8

Breather As.

9 C-4937

51

C-2

Co oler Gp

4W -5056

52

B-3

23

28

C-3

Filter Gp - Charge

6I-8073

53

C-3

Pump Gp - Charge

9W -9309

54

B-3

Pump Gp -S -Sc avenge

9W -9309

55

B-3

Screen

7J-0725

37

A-3

T an kG p - Hy dr ./ ./ Tr Tr an sm si si on

3 00 2 - 04 8

42

A3 -

V al ve Gp Gp - Co ol er In In e l tR tRe il ef

2 P-2 85 9

56

B3 -

57

E -1 2

 Attachmen ts Traction Control System V al ve G p - Tr ac ti on C on tr ol S ys t.

9 G- 92 08

12 Tap Locations Tap Number   AA

 

Description

SteeringPump Pressure

BB

System Oil Samp ling -S - Steering

CC

Left Brake Press ure

 

Schematic Location

29 14

31

40

5

6

18

25

11

41

46

50 17

36

48 49

42

26

37

22

47

H-3 E-3 E-12

WireColor 

CircuitNumber  Identification

DD

Transmission

1 69-9 010

WireColor 

W ri e Ga ug e

325-PK-14

CC

D-9

Valve Gp Gp - T/C Lo ck Up Cl Clutch

Driv eG eGp - Pump Dr Drive Bo Box

W ri e C o ol r

13

G1 - 0

Valve Gp Gp - Brak eR eRetrac t

48

57

D-7

3 T- 80 98

Pump Gp -T -T /C Charge

3P-0 348

46

G-9

P um pG pG pp- Pa Pa k r n i gB gB a r ke Rt Rt c r .t

Valve Gp Gp - T/C Inlet Re Reli ef

CircuitNumber  Identification

PreviousStandard Wire

4

8X-7224

43

H y dr a u il c S c he m at i c E x am p l e

D-7 E-9

175-7051

3 00 -2 04 8

Wire

325-PK CircuitIdentification Number 

8W -5002

V al ve G p - Br ak e Co ol er D vi er te r 1 05 0 - 17 0

Flow Symbol

325-AG135PK-14

Pump Gp Gp - Brak eR eRetract

T an kG p - Hy Hy dr . / Tr an sm si si on

Level Symbol

CurrentStandard

CurrentStandard Harnessidentificationcode Thisexampleindicates wire135in harness"AG".

Pump Gp -B - Brak e Cool ing

32

Temperature Symbol

WireNumber Identification Codes

F1 - 0

19 20

2 3

Pressure Symbol

B1 - 3, H 1 - 3

Cyl inder Gp -H -Hoist

Orifi ce

ElectricalWire

TemperatureSwitch

T

1 19 -9 01 4

CylinderGp- FrontBrakeMaster  e r    OilCooled: 8X-7223   DryDisc: 8X-6987

ElectricMotor 

F-13

Breather

C or e As . - T/ C Ou tl et O li C oo le r

Generator 

Electrical Symbols (Electrical)

B-5, H-5

B ra ke G p - Se rv ic e an d Pa rk

C ore As As . -B -Br ak e Co ol ni gO gOi l

M

G Transducer  (Fluid)

COMPONENT LOCATIONS

15

13

 A

Wire Gauge (EXAMPLEVALVE)

13

   )   s   e    h   c   n    i    5    3   x   s   e    h   c   n    i    8    4   :   s   n

   1    3    4    8    R   o    i   s    N  n   e   m    E   i   D    (    R  ,   e

12

11

10

9

8

7

6

5

4

3

2

1

CYLINDER GP 300-0239

I

LEFT REAR

BRAKE GP SERVICE AND PARK REAR: 119-9014

SCREEN 6E-5066

ORIFICE 122-7765

TANK GP SERVICE BRAKE MAKE UP 143-9426

L

BRAKE GP SERVICE OIL COOLED MULTI DISC 8X-3810

I

R PUMP GP HAND METERING UNIT 195-6617

LEFT

BRAKE GP SERVICE DRY DISC 125-1384

VALVE GP BRAKE RETRACT 113-1543

BRAKE

MAIN RELIEF DUMP SPOOL VALVE GP CHECK 175-7050

FRONT

  g   a    P    6    3

VALVE GP PROPORTIONAL CONTROL 245-1668

dd

G

 AA

DUAL STAGE SIGNAL SPOOL

LOWER RELIEF

VALVE GP COOLING DIVERTER 105-0170

VALVE GP CHECK BRAKE RETRACT 138-4732

PUMP GP STEERING SECONDARY 175-7051

SWITCH AS. LOW PUMP PRESS. 3E-6450

RAISE RELIEF

CYLINDER GP REAR MASTER 137-0279

H

VALVE GP SHUTTLE LOAD SENSE PILOT 8J-6875

H

M

SECONDARYBACKUP RELIEFVALVE

G

PRIMARYBACKUP RELIEFVALVE

CYLINDER GP FRONT MASTER OIL COOLED 8X-7223

LOWER,FLOAT, SNUB SOLENOID

NOTE A

ECM

CYLINDER GP FRONT MASTER DRY DISC 8X-6987

RAISE

HOLD

T/C OUTLET OIL COOLER 141-4109

SNUB

SCREEN 9T-1460

MANIFOLD 5T-5533

BRAKE COOLING RELIEF

ee F

DRIVE GP PUMP DRIVE BOX 169-9010

FLOAT

VALVE BREAKER 9T-0818

F

LOWER

bb aa CYLINDER GP HOIST 300-0688

SCREEN 6E-6640

PUMP DRIVE

ORIFICE PLATE 8X-7224

BOX

BRAKE COOLING OIL COOLER 141-4109

FILTER GP RETURN 144-0832

RAISE SOLENOID

CC

BB

PUMP GP STEERING 219-1965

dd

ee

 ADJUSTER GP SLACK: 2G-5900

FILTER GP PUMP CASE DRAIN 173-0159

E  ADJUSTER GP FRONT SERVICE BRAKE (USED WITH OIL COOLED MULTI DISC) 8X-7921

FILTER GP BRAKE RETRACT 172-3889

bb

VALVE GP T/C LOCK-UP CLUTCH 6I-9476

VALVE GP T/C INLET RELIEF 3P-0348

aa

VALVE GP T/C OUTLET RELIEF 3P-0349

DRIVE GP PUMP DRIVE BOX 169-9010

BREATHER 8X-4575

E

TANK GP 242-1137

NOTE A

LOAD SENSE STEERING SYSTEM

DD  ATTACHMENT D

FILTER GP T/C CHARGE 4T-4760

TRACTION CONTROL SYSTEM 9G-9208

PUMP GP HOIST 230-7132

CONVERTOR GP TORQUE CONVERTER 290-3651

PUMP GP BRAKE RETRACT 3T-8098

D

PUMP DRIVE BOX

Tap Locations Tap Number 

VALVE GP MANUAL DIVERTER 3G-2887

HYD CONTROLS

 

M

C

PUMP GP T/C SCAVENGE 3T-8098

SteeringPump Pressure

PUMP GP BRAKE COOLING 8E-3883

PUMP GP T/C CHARGE 3T-8098

H-3

BB

System Oil Sa mplin g- Ste erin g

CC

Left Brake Pressure

E-12

DD

Right Brake Pressure

D-12

E-3

LINEPATTERNS PressureLine

DRIVE GP PUMP DRIVE BOX 169-9010

Drain/ReturnLines ComponentGroup  Attachment

PUMP DRIVE BOX

 AirLine

CALLOUTS

RIGHT REAR

PUMP GP TRANSMISSION CHARGE 9W-9309

SCREEN 7J-0725 ORIFICE PLATE 8W-5002

SCREEN 7J-3723

B

FRONT BRAKE GP SERVICE DRY DISC 125-1384

BRAKE GP SERVICE AND PARK REAR: 119-9014

VALVE GP COOLER INLET RELIEF: 2P-2859

PUMP GP TRANSMISSION SCAVENGE 9W-9309

YY

Taps (Pressure, Sampling,Sensor) by letter 

52

Components bynumber  B

NOTE A: GRAY BOXES INDICATE OIL COOLED BRAKE SYSTEM COMPONENTS AND CIRCUITS FOR FRONT SERVICE BRAKES.

COOLER TRANSMISSION 4W-5056

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

TANK GP HYDRAULICS/TRANSMISSION 300-2048

HOIST, TORQUE CONVERTOR, SERVICE AND PARKING BRAKES, AND BRAKE COOLING

ELECTRICAL CIRCUITS PARKING BRAKES CURCUIT TRANSMISSION AND TORQUE CONVERTER SCAVENGE PUMP CIRCUIT

SCREEN 7J-0725

HOIST PUMP CIRCUIT PUMP SUPPLY LINE DRAIN / RETURN LINE BRAKE COOLING

 A

 A

STEERING PUMP CIRCUIT SECONDARY STEERING PUMP CIRCUIT

TRANSMISSION

TRANSMISSION CHARGE PUMP CIRCUIT TORQUE CONVERTER CHARGE PUMP CIRCUIT BRAKE CIRCUIT (FRONT and REAR)

THISSCHEMATICISFORTHE 777DOFF-HIGHWAYTRUCK PART#:300-5719CHNG01 Compone n t s a r e s h o w n i n tsa l l e d o n a f u l l y o p ear b l e m a c hni e w i t h t h e k e y a n d e n g i n e offandtransmission shifterinneutral. Refertothe appropriateService Manualfor Troubleshooting,Specifications andSystemsOpe rations

13

C

Pilot/LoadSensingPressure

TANK GP HYDRAULICS/TRANSMISSION 300-2048

RIGHT

BRAKE

Schematic Location

TRANSMISSION

FILTER GP TRANSMISSION CHARGE 61-8073

BRAKE GP SERVICE OIL COOLED MULTI DISC 8X-3810

Description

 AA

BREATHER AS. 9C-4937

PUMP GP BRAKE RETRACT ELECTRIC 175-7051

 

12

11

10

9

8

7

6

5

4

3

2

1