RENR6498

24Page,TRM

©2004 Caterpillar

All Rights Reserved

Printed in U.S.A.

RENR6498

January 2004

914G Wheel Loader

Hydraulic System

914G:

PDF1-UP

IT14G:

FWL1-UP

IT14G Integrated Tool Carrier

KZN1-UP

ONE POSITION TWO POSITION THREE POSITION

VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL

LINES CROSSING LINES JOINING

TWO-WAY THREE-WAY FOUR-WAY

SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION

(FIXED)

2-SECTION PUMP

MAIN AUX.

SPRING

(ADJUSTABLE)

VARIABILITY LINE RESTRICTION

(VARIABLE)

LINE RESTRICTION

(VARIABLE and PRESSURE COMPENSATED)

PRESSURE

COMPENSATION

PUMP: VARIABLE and

PRESSURE COMPENSATED

ENERGY TRIANGLES

HYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXED

DISPLACEMENT

VARIABLE DISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULIC PUMPS

FLUID STORAGE RESERVOIRS

CROSSING AND JOINING LINES

VALVE ENVELOPES VALVE PORTS

BASIC COMPONENT SYMBOLS

FLUID CONDITIONERPUMP or MOTOR

FLUID POWER SYMBOLS

FIXED

DISPLACEMENT

VARIABLE DISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLSRELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNAL

SUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOID

or MANUALSOLENOID

and PILOT

SOLENOID and

PILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASIC SYMBOL SPRING LOADED

CHECK VALVES

TWO

POSITION

INFINITE

POSITIONING

FLOW IN ONE

DIRECTION

FLOW ALLOWED IN

EITHER DIRECTION

THREE

POSITION

CROSS

FLOWPARALLEL

FLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P T

SHIFTED POSITION INFINITE POSITION

CONTROL VALVES

Hydraulic Symbols (Electrical)

Electrical Symbols Table

325-AG135 PK-14

Circuit IdentificationNumber

Wire Color Wire Gauge

Harness identification code

This example indicates

wire 135 in harness "AG".

325-PK-14

Wire Gauge

Wire Color

Circuit Number

Identification

Wire Number Identification Codes

Current Standard

Previous Standard

Electrical Schematic Example Hydraulic Schematic Example

325-PK

Wire ColorCircuit Number

Identification

B A

Wire

Wire

(EXAMPLE VALVE)

Current Standard

Transducer(Fluid)

Transducer(Gas / Air)

G

Generator

Electrical WirePressure Switch

MElectric Motor

Pressure Switch

(Adjustable)

Temperature Switch

T

PressureSymbol

TemperatureSymbol

LevelSymbol

FlowSymbol

Electrical Symbols (Electrical)

Valve Gp - Ride Control (52)

Valve Gp - Coulper (38)

Hystat Pump (24), Hystat Signal Oil PressureTest Port (FF), Charge Pump PressureTest Port (GG), Hysta Pump Case PressureTets Port (HH)

Hystat Pump (24), Hystat Drive Loop PressureTest Port (II)

Manifold - Brake Accumulator (18),Pressure Switch - Brakes (26),Brake Pressure Test Port (BB)

Motor Gp - Hysta Large (19) & Small (20) VariableDisplacement, Large Motor Control Signal PressureTest Port (KK), Small Motor Control Signal Test Port (JJ)

Valve Gp - Over Speed (44)

Valve Gp - Steering & Brake Manifold (55),Steer Pressure Test Port (OO)

Valve Gp - Steering & Brake Manifold (54),Steer Pressure Test Port (OO)

Tank Gp - Hydaraulic (28),Valve Gp - Secondary Steer (53),Secondary Steer Pressure Switch (27),Steering Pressure Test Port (AA)

Valve Gp - Work Tools (29-34),Work Tool Valve PressureTest Port (DD)

RH Front Brake, Brake OilPressure Test Port (NN)

Filter Gp - Charge Pump (15),Oil Sample Port (EE), HystatPump Pressure Test Port (LL)

Cooler (6), Cooling LoopPressure Test Port (CC)

ref:g01050165

ref:g00541782

ref:g01044042

ref:g00407723

ref:g01045825

ref:g0470523

ref:g01041813

ref:g01047991

ref:g01045786

ref:g00407723

ref:g01047752

ref:g01052503

DD

OO

44

54

OO

55

AA

53

27NN

15

EE

LL

CC

6BB

18

KK

26

JJ

1920

GG

FF

HH

24

52

38

Machine Component Locations

DescriptionPart

Number

Machine

Location

Schematic

Location

Accumulator - Brake 149-5533 1 C-14

Accumulator - Pilot 228-0788 2 B-11, E-11

Accumulator - Ride Control 228-0790 3 D-11, G-11

Block Gp 122-7272 4 C-9

Block Gp - Tank 204-2585 5 A-14

Cooler 234-0177 6 A-14

Cylinder Gp - Coupler Stroke 115.0 mm 188-0982 7 E-13

Cylinder Gp - Coupler Stroke 80.5 mm 190-3085 8 E-13

Cylinder Gp - Lift (914) 109-1334 9 G-10

Cylinder Gp - Lift (LH) (IT14) 131-4402 10 D-10

Cylinder Gp - Lift (RH) (IT14) 131-4401 11 D-10

Cylinder Gp - Steering 104-4187 12 F-14

Cylinder Gp - Tilt (914) 6E-5918 13 G-9

Cylinder Gp - Tilt (IT14) 111-6245 14 D-10

Filter Gp - Charge Pump 137-7747 15 E-6

Hand Metering Unit (Cosa) 150-5405 16 E-14

Hand Metering Unit (Japan & NACD) 149-4830 17 E-14

Manifold - Brake Accumulator 152-1110 18 C-13

Motor Gp - Hystat Large Var Disp 134-7307 19 E-3

Motor Gp - Hystat Small Var Disp 168-1837 20 F-3

Orifice 114-0441 21 C-10, G-10

Orifice 8C-0564 22 B-10, E-10

Pump Gp 157-2630 23 B-14, F-7

Pump Gp - Hystat 156-7205 24 D-5

Pump Gp - Secondary Steering 240-0803 25 B-15

Switch - Pressure (Brakes) 150-3754 26 C-14

Switch - Pressure (Secondary Steer) 3E-6450 27 B-14

Tank Gp - Hydraulic 108-6200 28 A-14

Valve Gp - 2 Stem (914) 133-3823 29 F-8

Valve Gp - 2 Stem (IT14) 133-3826 30 B-7

Valve Gp - 3 Stem (914) 133-3824 31 F-8

Valve Gp - 3 Stem (IT14) 133-3827 32 B-7

Valve Gp - 4 Stem (914) 133-3825 33 F-8

Valve Gp - 4 Stem (IT14) 133-3829 34 B-7

Valve Gp - Auxiliary 117-3637 35 B-9, F-9

Valve Gp - Brake / Inching 149-4139 36 F-1

Valve Gp - Check 9T-3096 37 B-15, E-5

Valve Gp - Coupler 193-4750 38 D-13

Valve Gp - Dead Engine Lower 112-1817 39 C-11, F-11

Component Locations

Valve Gp - Hystat Brake Shutoff 112-1817 40 G-2

Valve Gp - Inching 107-3255 41 G-1

Valve Gp - Lift 117-3636 42 B-10, G-10

Valve Gp - Overspeed 196-5862 43 G-5

Valve Gp - Pilot Joystick 163-3118 44 A-11, E-11

Valve Gp - Pilot Joystick & 2 Aux 163-3121 45 A-11, E-11

Valve Gp - Pilot Joystick & Aux 163-3120 46 A-11, E-11

Valve Gp - Pilot Shutoff 112-1817 47 B-11, E-11

Valve Gp - Relief 186-0906 48 C-8, C-9, F-9

Valve Gp - Relief 186-0907 49 C-10

Valve Gp - Relief 186-0909 50 C-11, F-11

Valve Gp - Relief 186-0911 51 C-10, F-9

Valve Gp - Ride Control 111-0350 52 C-11, G-10

Valve Gp - Secondary Steering 113-7863 53 B-14

Valve Gp - Steering & Braking Manifold 156-5314 54 C-14

Valve Gp - Steering & Braking Manifold 234-5120 55 G-13, G-15

Valve Gp - Tilt (914) 117-3637 56 F-9

Valve Gp - Tilt (IT14) 117-3639 57 B-10

28

Solenoid779-WH / K927- BUM793-YL / 780-PU

Solenoid 914G976-OR200-BK

Pressure Switch417-GY200-BK

Solenoid755-OR975-WH

Pressure Switch483-BR200-BK

Filter Bypass SwitchC466-PK

Description Media Number

914G Wheel Loader (PDF) SEBP3977

IT14G Integrated Tool Carrier (FWL & KZN) SEBP4016

Specifications: (Steering System) RENR6469

Systems Operation / Testing and Adjusting: (Steering System) RENR6497

Specifications: (Brake System) RENR6494

Systems Operation / Testing and Adjusting: (Brake System) RENR6495

Specifications: (Hydraulic System) RENR6493

Systems Operation / Testing and Adjusting: (Hydraulic System) RENR6492

Schematic: (Electrical System) RENR6499

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Solenoid IT14GA519-GN200-BK

SolenoidsFWD P914-GN/ F762-GYREV 752-YL / F762-GY

3

4

5

6

8

9 10 1112

14

15

13

161 2 1718

19 20

21

22

23

24

25

26

27

28

29 30 31

32

37

3533 34

36

38

7

3940

41

42

43

44

45 46 47

48 49

50 51

52

53

54 55

56

37

57

II

24

3

4

5

6

8

9 10

11

12

1415

13

16

1 2

171819

20

21

2223 24

25

26

27 28

29 30 31

32

37

3533 34

36 38

7

39

40

41

4243

44

45 46 47

48 49 50

51

52

53

54 55 56

4

9

3

12

14

37

57

Tap Locations

Pressure, Sampling, and Sensor

Tap

NumberDescription

Schematic

Location

AA Steering Pressure (SP) B-14

BB Service Brake Pressure (SB) C-14

CC Cooling Loop Pressure (CL) A-14

DD Work Tool Valve Pressure (IP) B-11 , E-11

EE Oil Sample Valve E-6

FF Hystat Pump Signal Oil Pressure (PS) F-6

GG Charge Pump Pressure (G1) F-5

HH Hystat Pump Case Pressure (PS) F-5

II Hystat Drive Loop Pressure (AB) F-5

JJ Large Motor Control Signal Pressure (M2) G-3

KK Small Motor Control Signal Pressure (M1) E-4

LL Hystat Pump Pressure E-6

NN C-3

OO Steering Pressure C-13

MM Large Motor Over Speed Signal (OS) G-5

Brake Oil Pressure

RENR6498

24Page,Color2,TRM

121314 12345678

A

B

C

D

E

G

F

9101112131415 345678 12

A

C

D

E

G

B

F

15 91011

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS

Steering & Brake Pump Output.

Work Tools Pump Output.

Hydrostatic Drive Pump Output.

Supply Line.

Drain / Return Line.

Hand Metering Unit Control System.

Steering & Brake Charging Circuit.

Hydrostatic Pump Signal Control Circuit.

Secondary Steering Pump Output.

Tilt Cylinder Control Circuit.

Hydrostatic Charge Output.

Coupler Cylinder Control Circuit.

4TH Function Control Circuit.

Large Motor Control Signal Circuit.

Lift Cylinder Control Circuit.

Brake Cylinder Control Circuit.

Attachment Cylinder Control Circuit.

IT14G

ONLY

914G

ONLY

NN

S1

TO ATTACHMENTCYLINDERS

TO 4TH FUNCTION

FUNCTION S1 S2 S3

CUSHION RIDE 1 0 0

COUPLER ENGAGE 0 1 0

COUPLER DISENGAGE 0 0 1

NORMAL OPERATION 0 0 0

0 = SOLENOID DE-ENERGIZED

1 = SOLENOID ENERGIZED

PILOT SUPPLY FROMHYSTAT CHARGE PUMP

T LS P

HYSTAT CHARGE & PILOT SUPPLY

HYSTAT SUPPLY (FORWARD)

HYSTAT SUPPLY (REVERSE)

FROM HYSTAT MOTOR CASE DRAIN

TO HYSTAT MOTOR BEARING

FROM HYSTAT PUMP CASE DRAIN

M

ELECTRONICCONTROLLER

C

D

B

E FROM HYSTAT BRAKE/INCH VALVE DRAIN

BRAKE LINETANK RETURN

TO BRAKE/INCHING

VALVE

TO LIGHTON DASH

G

F

TO LIGHTON DASH

VALVE GP

LIFT

117-3636

VALVE GP

TILT

117-3639

WIRED TO CONTROLLER

HAND METERING UNIT

149-4830 JAPAN & NACD

150-5405 COSA

PRESS SW

BRAKES

150-3754

MANIFOLD

ACCUMULATOR

BRAKE

152-1110

S1

CYLINDER GP

TILT

111-6245

CYLINDER GP

LIFT (RH)

131-4401

CYLINDER GP

LIFT (LH)

131-4402

VALVE GP

RIDE CONTROL

111-0350

ACCUMULATORS

RIDE CONTROL

228-0790

ORIFICE

114-0441

VALVE GP

DEAD ENGINE

LOWER

112-1817VALVE GP

RELIEF

186-0909

VALVE GP

RELIEF

186-0904

BLOCK

122-7272

VALVE GP

RELIEF

186-0911

VALVE GP

RELIEF

186-0906VALVE GP

RELIEF

186-0906

VALVE GP

RELIEF

186-0906

VALVE GP

133-3826 2 STEM

133-3827 3 STEM

133-3829 4 STEMVALVE GP

AUXILIARY

117-3637

VALVE GP

AUXILIARY

117-3637

ORIFICE

8C-0564VALVE GP

PILOT SHUTOFF

112-1817

ACCUMULATOR

PILOT

228-0788

VALVE GP - PILOT

163-3118 JOYSTICK

163-3120 JOYSTICK & AUX

163-3121 JOYSTICK & 2 AUX

TANK GP

HYDRAULIC

108-6200

COOLER

234-0177

BLOCK GP

TANK

204-2585

PUMP GP

157-2630

PUMP GP

SECONDARY

STEERING

240-0803

VALVE GP

CHECK

9T-3096

VALVE GP

STEERING

& BRAKE

MANIFOLD

156-5314

(PDF1-UP)

(FWL1-UP)

ACCUMULATORS

BRAKE

149-5533

CYLINDER GP

STEERING

104-4187

AUX AUX

TO ATTACHMENTCYLINDERS

S3S2

CYLINDER GP

COUPLER

190-3085 STROKE 80.5mm

188-0982 STROKE 115.0mm

VALVE GP

COUPLER

193-4750

VALVE GP

SECONDARY

STEERING 113-7863

PRESSURE

SWITCH

SEC STEER

3E-6450

A

LOWER/FLOAT

RAISE RACK BACK DUMP/REGEN

AUX AUX

ACTR

FNR

POR

CHRG

R&R

SPEEDSENSING R&R

TO STEERING HMU

TO IMPLEMENT VALVE

FROM HYDRAULIC TANK

TO IMPLEMENT PILOT SYSTEM

TO HYDRAULIC TANK

914G & IT14G SPEEDER - HYSTAT SCHEMATIC

80cc

107cc FWD CCW

FLUSH

SHUTTLE

FROM HYDRAULIC TANKFLUSHING BYPASS BLOCK

TO HYDRAULIC TANKRETURN CHECK VALVE

CW

X1

X3

X4

X2

FWD

FWD

PS1 G1 AB PSG PC

OS

B

MB

MA

A

FWD

MIN

M1

X2X1

U

FWD CCW

U

T1

MIN

M2

A

B

C

D

PUMP GP

157-2630

FILTER GP

CHARGE PUMP

137-7747

PUMP GP

HYSTAT

156-7205

MOTOR GP

HYSTAT

SMALL

VARIABLE

DISPLACEMENT

134-7307

MOTOR GP

HYSTAT

LARGE VARIABLE

DISPLACEMENT

168-1837

VALVE GP

OVER SPEED

196-5862

VALVE GP

CHECK

9T-3096

DISPCONTROL

DISPCONTROL

FROM HYDRAULIC TANK

CREEPERVALVE

TO

HYDRAULIC

TANK

BRAKELINETANKRETURN

TO BRAKESSUPPLYPRESSUREFROMBRAKEACCUMULATORS

VALVE GP

BRAKE / INCHING

149-4139VALVE GP

HYSTAT BRAKE

SHUTOFF

112-1817

E

VALVE GP

INCHING

107-3255

GF

TO ATTACHMENT

CYLINDERS

FUNCTION S1

CUSHION RIDE 1

NORMAL OPERATION 0

0 = SOLENOID DE-ENERGIZED

1 = SOLENOID ENERGIZED

PILOT SUPPLY FROMHYSTAT CHARGE PUMP

WIRED TO CONTROLLER

ORIFICE

8C-0564

ORIFICE

8C-0564

S1

VALVE GP

RELIEF

186-0906

VALVE GP

RELIEF

186-0906

CYLINDER GP

TILT

6E-5918

VALVE GP

RELIEF

186-0911

VALVE GP

RELIEF

186-0911

CYLINDER GP

LIFT

109-1334

ORIFICE

114-0441

VALVE GP

RIDE CONTROL

111-0350

ACCUMULATORS

RIDE CONTROL

228-0790

VALVE GP

DEAD ENGINE

LOWER

112-1817

VALVE GP

RELIEF

186-0909

VALVE GP

LIFT

117-3636

VALVE GP

TILT

117-3637

ACCUMULATOR

PILOT

228-0788

VALVE GP

PILOT SHUTOFF

112-1817

VALVE GP

AUXILIARY

117-3637

A

LOWER/FLOAT

RAISE RACK BACK DUMP AUX AUX

IT14G

914G

914G

IT14G

IT14G

ONLY

IT14G

ONLY

914G

IT14G

IT14G

ONLY

914G IMPLEMENT

CONTROLS

IT14G IMPLEMENT

CONTROLS

ORIFICE

8C-0564

VALVE GP

133-3823 2 STEM

133-3824 3 STEM

133-3825 4 STEM

VALVE GP - PILOT

163-3118 JOYSTICK

163-3120 JOYSTICK & AUX

163-3121 JOYSTICK & 2 AUX

CC

BB

JJ

KK

HH IIGGFF

THIS SCHEMATIC IS FOR THE 914G & IT14G

WHEEL LOADER AND INTEGRATED TOOL CARRIER

Part #: 234-1887 CHG 02 (914G PDF1-UP)

Part #: 234-1888 CHG 02 (IT14G FWL1-UP)

Part #: 212-7127 CHG 03 (IT14G KZN1-UP)

Components are shown installed on a fully operable machine with the key and engine

off and transmission shifter in neutral.

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

DD

DD

AA

VALVE GP

STEERING

& BRAKE

MANIFOLD

234-5120

(KZN1-UP)

STRAIGHT THROUGH

CONNECTION

(JAPAN & NACD)

STRAIGHT THROUGH

CONNECTION

(JAPAN & NACD ONLY)

STRAIGHT THROUGH

CONNECTION

(COSA ONLY)

TO BRAKE ACCUMULATOR

MANIFOLD

SIGNAL LINE

FROM COUPLER

VALVE

FROM STEERING

PUMP CIRCUIT

MOWER ATTACHMENT

IMPLEMENT RETURN

(REMOVE HOSE JUMPER)

TO MOWER ATTACHMENT

IMPLEMENT SUPPLY

ALTERNATE CONFIGURATION

BRUSH CUTTER APPLICATION

NOTE:

SEE SCHEMATIC

LOCATION

G-13 & G-15

FOR KZN1-UP

OIL SAMPLING VALVE

FILTERBYPASSSWITCH

EE

LL

MM

IP

CL

SP

SB

IP

FRONT BRAKESREAR BRAKES

TO TANK

OO