RENR9126

30Page,TRM

RENR9126

March 2005

M318C Wheeled Material Handler

Hydraulic SystemM322C Wheeled Material Handler

©2005 Caterpillar

All Rights Reserved

Printed in U.S.A.

M318C MH:

BEB2001-UP

H2G1-UP

M322C MH:

H2F1-UP

BDY2001-UP

8

8

23

5 6

84810 11

50

7

21

2 35 19

30

24

22

32

33

44

20

27

9

46

15

26

25

28 29

18

4

16

13

17

12

49

39

1

40

3 14

41 47

31 34

43

36

45

38 42

40

31

41

34 39

47

43

36

45

38 42

15

26

25

28 2949

4

16

13

17

122044

46

9

9

18

27

41

19

35

33

10

10

11

2

48

37

6

32

31 14

5 30

723

50 21

24

22

37

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 RESTRICTIONVARIABLE 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

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOT

CONTROLLED

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)

A3

B1

M3

MA

26

40

4731

32

41

S2

S1

MP

M2

M6

P2

MLS

M5

P1

MM

M1

Mb

Ma

28

Tap Locations

Pressure, Sampling, and Sensor

Tap

NumberDescription

Schematic

Location

A3 Swing Brake Press C-11

B1 Brake Pressure C-8

LL Clutch Release I-9

M1 Main Pump Destroking Press A-6

M2 Pilot C-6

M3 Parking Brake Pressure Reserve B-9

M5 Prop Main Pump C-6

M6 Prop Swing Pump C-6

MA Quick Coupler Control Valve G-7

Ma Swing Pump Op Press A A-4

Mb Swing Pump Op Press B B-4

MLS Load Sense C-6

MM Joystick Steering C-6

MP Main Pump C-6

P1 Priority Steering Valve C-6

P2 Pump - Fan Drive C-6

S1 Accumulator Service Brake (1st Brake) B-8

S2 Accumulator Service Brake (2nd Brake) B-7

Main & Swing Pumps

Machine Component Locations

Brake Control Valve

Pressure Tap Panel

Quick Coupler Valve

Pilot Manifold

Description

Part

Number

Part

NumberSchematic

Location

Machine

LocationM318C M322C

Accumulator As - Brake 5W-9971 5W-9971 1 B-7, B-8

Accumulator As - OSC Axle 8U-2924 8U-2924 2 I-7

Accumulator As - Pilot 8U-6159 8U-6159 3 B-10

Cap - Breather 194-7849 194-7849 4 A-12

Control Gp - Hydraulic (LH) 243-4044 243-4044 5 E-11, F-11

Control Gp - Hydraulic (RH) CNU 243-4043 243-4043 6 E-10, F-10

Control Gp - Hydraulic Hand (Doz/Stab) 193-7789 193-7789 7 E-12

Cylinder Gp - Axle Lock 8U-4461 8U-4461 8 H-7, I-7

Cylinder Gp - Dozer Blade 252-7300 252-7300 9 H-11, I-11

Cylinder Gp - Stabilizer 224-9320 224-9320 10 H-6, I-6

Cylinder Gp - Steering 5W-5696 5W-5696 11 I-7

Filter Gp - Fan Circuit 227-6000 227-6000 12 C-4

Filter Gp - Main Return 193-5975 193-5975 13 A-3

Filter Gp - Oil (Pilot Circuit) 145-7750 145-7750 14 C-8

Filter Gp - Oil (Swing Circuit Make-Up) 109-7288 109-7288 15 B-5

Filter Gp - Swing Pump Drain 8U-0198 8U-0198 16 A-6

Filter Gp - Travel Motor Drain 8U-0198 8U-0198 17 A-3

Motor Gp - Gear (Fan Drive) 197-4602 197-4602 18 C-4

Motor Gp - Swing 152-7371 152-7371 19 B-4

Motor Gp - Travel 225-8180 225-8180 20 A-8

Pedal Gp - (Pilot Control) 112-5704 112-5704 21 E-10

Pedal Gp - (Pilot Control) 237-2261 237-2261 22 E-11

Pedal Gp - (Pilot Control) Note A 254-2684 254-2684 23 E-10

Pedal Gp - (Travel Valve) Note B 254-2685 254-2685 24 E-10

Pump Gp - Gear (Fan Drive) 196-8428 196-8428 25 B-4

Pump Gp - Main 240-0145 240-0143 26 A-6

Pump Gp - Pilot, Steering, Brake, Aux 196-8424 196-8424 27 B-6

Pump Gp - Swing 190-8199 196-8429 28 A-5

Solenoid As - Pump Margin Pressure 216-1397 216-1397 29 B-6

Valve As - Priority (Steering) 188-1814 188-1814 30 D-8

Valve Gp - Solenoid (Travel Lockout) 240-6325 240-6325 31 B-12

Valve Gp - Brake Control (Travel) 176-7800 176-7800 32 B-8

Valve Gp - Check (Boom) 202-4095 202-4095 33 G-6

Valve Gp - Check (End Cover) 239-7774 239-7774 34 C-9

Valve Gp - Check (Offset Boom) 202-4096 202-4096 35 G-8

Valve Gp - Check (Stick) 202-4092 202-4092 36 F-5

Valve Gp - Check (VA Boom) 238-7021 238-7021 37 G-7

Valve Gp - Combination 191-2778 191-2778 38 F-2

Valve Gp - Control (Joystick Boom Steering) 239-7775 239-7775 39 C-9

Valve Gp - Control (Medium Press) 239-7773 239-7773 40 B-9

Valve Gp - Control (Quick Coupler) 176-9667 176-9667 41 G-7

Valve Gp - Control (Variable Adjusting) 192-3183 192-3183 42 E-7

Valve Gp - Main Control 208-5122 208-5122 43 D-5

Valve Gp - Pilot (Joystick Boom Steering) 242-9670 242-9670 44 E-9

Valve Gp - Selector & Flow Control 243-5227 243-5227 45 G-10

Valve Gp - Solenoid (Dozer Blade) 196-7544 196-7544 46 I-10

Valve Gp - Solenoid (Pilot Manifold) 235-0783 235-0783 47 B-10

Valve Gp - Solenoid (Stabilizer) 196-7543 196-7543 48 I-6

Valve Gp - Solenoid (Travel Start Control) 254-2683 254-2683 49 F-4

Valve Gp - Steering 205-6215 187-3774 50 E-8

Note A: w/o tempomat

Note B: w/ tempomat

Component Locations

RENR9126

30Page,Color2,TRM

DRAIN / RETURN LINE

LINES GROUP COLOR DESCRIPTIONS

MAIN PUMP OUTPUT

SWING PUMP OUTPUT

STEERING CONTROL CIRCUIT

BRAKE PILOT STEERING PUMP OUTPUT

MATERIAL HANDLER CONTROL AND CYLINDER CIRCUIT

WHEEL BRAKE CONTROL CIRCUIT

MAIN CONTROL VALVE PILOT CIRCUIT

SUPPLY LINE

SHUT OFF VALVE CONTROL CIRCUIT

VA BOOM CONTROL CIRCUIT

FAN PUMP OUTPUT

TRAVEL VALVE CONTROL CIRCUIT

BOOM CONTROL CIRCUIT

STICK CONTROL CIRCUIT

DOZER BLADE / STABILIZER CONTROL CIRCUIT

SWING PUMP CONTROL CIRCUIT

BOOM AND BUCKET CONTROL CIRCUIT

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling,Sensor) by letter

Components by number

YY

52

A

B

C

D

E

F

G

H

I

A

B

C

D

E

F

G

H

I

12 11 10 9 8 7 6 5 4 3 2 1

12 11 10 9 8 7 6 5 4 3 2 1

nu

N

L

RH

LH

MCV

PU

T

VALVE GPSTEERING187-3774 (M322)205-6215 (M318)

MOTOR GP

(TRAVEL)

225-8180

MOTOR GP

SWING

152-7371

MOTOR GP

GEAR (FAN DRIVE)

197-4602

VALVE GP

MAIN CONTROL

197-9997 (M322C MH)

191-2762 (M318C MH)

PUMP GPMAIN240-0143 (322)240-0145 (318)

PUMP GPSWING196-8429 (M322C MH)190-8199 (M318C MH)

FILTER GP

MAIN RETURN

193-5975

b0 B0 A0VA BOOM

b5 BOOMP AUX 1 B5 A5 b4 B4 A4 b3DOZER/

STABI-

LIZER

L B3 A3STICK

A

B2 A2 b1 B1 A1TRAVEL BUCKETS51

B01 A01

PST

T

b01.2

A B

A1 B1GPST

T

M RL

P T

STICK IN

SW L SW R

STICK OUT

TP

DOWN

UP DOZER

STABILIZER

FWD

REV

TRAVEL

DEGU

OUT

INVA

BOOM

BOOM UP

BCT CL BCT OP

BOOM DOWN

P TTPTPTP

1212 1 32 4

P

PILOT

MANIFOLDT5

Z

P1

MG

m1

m2

K

P

B

K

B

PU

DSLSSABB

CLOSED WITH MPF

P T

STICK IN

SW L SW R

STICK OUT

1 32 4

P T

BOOM UPBCT CL BCT OP

1 32 4

BOOM DOWN

8

7

4

3

6

5

2

1PATTERN

CHANGER

V1 V2

C1 C2

MR X A T

B A

AMA B

T

P

XAT MR

BA

MR X A T

B A

A'XY

P

A

T

B

Z1

Z2

P T

MIN

MAX

MB

MA

G

X

T1

T2

S

B

A

GEL L

B KMK

MB

EK

EB

U

MS

T1/1 A5 M5

TRAVEL

MOTOR

CONTROL

A7 M7 A6 D6 M6

SWING

PUMP

CONTROL

MAIN

PUMP

CONTROL

TRAVEL

PILOT

CONTROL

A1A2A3A4

SWING

BRAKE

OSC

AXLE

REST

RESERVED

T1/2

SP

PST

M2 K

1IMPLEMENT

A8

DSLSSABBMG

m1

m2

K

B

PU

B

K

B

2

CLOSED WITH MPF

T5

Z

P1

PM3

A BFOR USE IF MACHINE

IS EQUIPPED WITH ONLY

ONE MEDIUM PRESSURE

FUNCTION

A B

T5

FLOW

CONTROL

CHECK

A2 B2 A1 B1 A3 B3

FOR USE IF MACHINE

IS EQUIPPED WITH

MORE THAN ONE

MEDIUM PRESSURE

FUNCTION

S2

S1

DS2

T

P

B1 B2

DS1

Qmax Qmin

S M1

A X ZG MXM

B

Ma

S

A

FA1FA FET2T1

RPS

Mb

Y2 Y3 Y1

X2X1 MHGFS

B

P

Z

R

T1

A

T2

N1N2N3

a01 b01

b01.1

T

PMP

S5a3 a2 a1

b2

a4S53 S52a5

IN OUT

K LS MLS LS AUX PMP P AUX 2a0

CFEF

P

LD

LD

TP

12

2

5643

1

2

5643

1

THIS HOSE ROUTING IS VALID

IF THE MACHINE IS EQUIPPED WITH A

JOYSTICK PATTERN CHANGER

GRAPPLE ROTATE

BUCKET ADJUST

HYDRAULIC CAB RISER OFFSET BOOM

TILT

VA BOOM QUICK COUPLER BOOM

1 32 4 12

P

FLOW

CONTROL VALVEPILOT

MANIFOLD

WHEEL BRAKE VALVE

ACCESS FROM GROUND

R2 T1 T2R1

SWING PUMP

SWING MOTOR

FAN DRIVE

S P

T

56

56

24

24 1

1

3

3

0

0

M1

BRAKE

PILOT

STEERING

PUMP MAIN PUMP

(IMPLEMENT,

TRAVEL, WORK TOOL)

a3 b3 a5 b5 SEE LOCB-7

b4 a4

A3

SEELOCD-3

SEE LOCB-5SEE LOC

D-5SEE LOC

F-6

SEE LOCB-5

SEELOCF-5

b3Y2

a01Y1

CONTROL GP

HYDRAULIC (RH) CNU

243-4043

b0 a0 b2 a2 a5 a1

SEELOCF-7

SEELOCD-7

SEELOCF-4

SEELOCD-4

SEE LOCD-6

SEE LOCD-3

b01

SEELOCD-2

b1

a3b5

M3

S1

B1

S2

SEE LOCF-4

B3

B3A3

A3 B3SEE LOC

F-9

A3

LL

b0

b0

SEE LOCF-7

SEE LOCF-10

MA

b5

b5

SEE LOCF-6 & C-10

SEE LOCF-6 & C-10

a5

M1

Ma

Mb

a01 b01

SEELOCF-11

SEELOCF-11

a1a2 SEE LOCF-10

SEE LOCF-10a3 SEE LOC

C10 & F-5

b3

a3

b2

SEE LOCC-10 &

D-5

b1 SEE LOCF-9

SEE LOCF-8

b4

SEE LOCF-12

SEE LOCF-11

SEE LOCF-10

SEE LOCF-11

SEE LOCF-10 a4

SEELOCF-6

SEELOCD-5F-5

Y2SEELOCF-11

SEELOCF-11

a0 SEE LOCF-10

Y1

MAIN PUMP

LOAD SENSE

MODE MAIN PUMP

MODE SWING PUMP

PILOT

AUX PUMP

FAN PUMP

JOYSTICK STEERING

MP

MLS

M2

M5

M6

P1

P2

MM

STEERING

CYLINDR

WHEEL

BRAKE

STABILIZER

OSC.

AXLE

LOCK

FWD

REV

CLUTCH

RELEASE

WHEEL

BRAKE

DOZER

BLADE

DEGU

MAIN CONTROL VALVE GP

VALVE GP

CONTROL (QUICK

COUPLER)

176-9667 OP

VALVE GP

CONTROL

(VARIABLE

ADJUSTING)

192-3183 OP

VALVE GP

CHECK (VA BOOM)

238-7021 OP

VALVE GP

CHECK (BOOM)

202-4095 OP

VALVE GP

CHECK (OFFSET BOOM)

202-4096 OP

CYLINDER GP

AXLE LOCK

8U-4461

CYLINDER GP

AXLE LOCK

8U-4461

CYLINDER GP

DOZER BLADE

252-7300

VALVE GP

SOLENOID

(DOZER BLADE)

196-7544 CYLINDER GP

STEERING

5W-5696

CYLINDER GP

STABILIZER

224-9320

VALVE GP

SOLENOID (STABILIZER)

196-7543 OP

TRAVEL MOTOR

SHUT OFF BALL VALVES

VALVE GP

COMBINATION

191-2778 OP

BUCKETSTICK

VALVE GP

SELECTOR &

FLOW CONTROL

243-5227 OPCONTROL GP

HYDRAULIC (LH)

243-4044

STICK &

SWING

PILOT

VALVE

BLADE &

STABILIZER

PILOT

VALVE

CONTROL GP

HYD HAND

(DOZ/STAB)

193-7789

CONTROL GP

HYD (LH)

243-4044

INSIDE

CAB

PEDAL GP

(PILOT

CONTROL)

237-2261 OP

PEDAL GP

(PILOT

CONTROL)

112-5704

OP

PEDAL GP

NOTE A

PILOT CONTROL

254-2684

NOTE B

TRAVEL VALVE

254-2685

CONTROL GP

HYD (RH)

CNU

243-4043

VALVE GP

PILOT

(JOYSTICK BOOM

STEERING)

242-9670 OP

VALVE AS

PRIORITY

(STEERING)

188-1814

STEERING

VALVE

FILTER GP

FAN CIRCUIT

227-6000

FILTER GP

OIL

(SWING CIRCUIT

MAKE-UP)

109-7288

SOLENOID AS

PUMP MARGIN

PRESSURE

216-1397

FILTER GP

OIL

(PILOT

CIRCUIT)

145-7750

VALVE GP

CONTROL

(JOYSTICK

BOOM

STEERING)

239-7775

OP

VALVE GP

CHECK

(END COVER)

239-7774 OP

VALVE GP

CONTROL

(MEDIUM

PRESS)

239-7773 OP

VALVE GP

SOLENOID

(PILOT MANIFOLD)

235-0783

ACCUMULATOR AS

PILOT

8U-6159VALVE GP

SOLENOID

(TRAVEL LOCK OUT)

240-6325

CAP

BREATHER

194-7849

FILTER GP

SWING PUMP DRAIN

8U-0198

PUMP GP

PILOT, STEERING,

BRAKE, AUX

196-8424

FAN

PUMPPUMP GP

GEAR

(FAN DRIVE)

196-8428

FILTER GP

TRAVEL MOTOR DRAIN

8U-0198

ACCUMULATOR AS

BRAKE

5W-9971

ENGINE

ACCUMULATOR AS

OSC AXLE

8U-2924

VALVE GP

CHECK

(STICK)

202-4092

VALVE GP

SOLENOID

(TRAVEL

START

CONTROL)

254-2683

VALVE GP

BRAKE

CONTROL

(TRAVEL)

176-7800

THIS SCHEMATIC IS FOR THE M318C MH & M322C MH

WHEELED EXCAVATOR

Part #: 253-4867 CHG00

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

off and transmission shifter in neutral.

NOTE A: PRFM REQ.: OP MARKED COMPONENTS

ARE OPTIONALAND NOT STANDARD.