RE

NR

9107-0

22

4 P

ag

e,

(Dim

en

sio

ns

: 3

4 i

nc

he

s x

28

in

ch

es

)

RENR9107-02October 2009

320D ExcavatorHydraulic System - AttachmentKGF1-UPMCH1-UPTDH1-UPDHK1-UPFAL1-UPKLM1-UPSPN1-UPPHX1-UP

Stick Lowering Control

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

PRESSURECOMPENSATION

PUMP: VARIABLE andPRESSURE COMPENSATED

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-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

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLSRELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNALSUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOID or MANUAL

SOLENOID and PILOT

SOLENOID and PILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

TWOPOSITION

INFINITEPOSITIONING

FLOW IN ONEDIRECTION

FLOW ALLOWED INEITHER DIRECTION

THREEPOSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOTCONTROLLED

Hydraulic Symbols (Electrical)

Electrical Symbols Table

325-AG135 PK-14

Circuit IdentificationNumber

Wire Color Wire Gauge

Harness identification codeThis example indicateswire 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)

© 2009 CaterpillarAll Rights Reserved

Printed in U.S.A.

Tap LocationsPressure, Sampling, and Sensor

TapNumber Description Schematic

LocationEE Left Pump Delivery Pressure B-3FF Right Pump Delivery Pressure A-3GG Pilot Pump Delivery Pressure A-4HH Left Pump Power Shift Pressure B-2JJ Case Drain Pressure B-2KK Right Pump Power Shift Pressure A-2

FF

KK JJ EE

HH

GG

SOS

HYD.TANK

Description PartNumber

MachineLocation

SchematicLocation

Accumulator Gp - Pilot Manifold Note B 20 B-5Block Note B 21 D-8Cylinder Gp - Boom Note A 22 F-2, F-3

Cylinder Gp - Stick Note A 24 F-8Filter Gp - Case Drain Note B 25 A-5Filter Gp - Pilot Hydraulic Note B 26 A-4Filter Gp - Return Oil Note B 27 A-7Manifold Gp - Control Note B 28 B-5, B-6Motor Gp - Swing Note B 29 F-6Motor Gp - Left Travel Note B 30 F-5Motor Gp - Right Travel Note B 31 F-4Pump Gp - Main Hydraulic Note B 32 B-2

Component Locations

Sensor As - Left Pump Pressure Note B 34 B-3Sensor As - Right Pump Pressure Note B 35 A-3

Switch As - LH Travel Pressure Note B 37 D-8Switch As - Pilot Pressure Note B 38 B-7Switch As - RH Travel Pressure Note B 39 D-7Swivel Gp Note B 40 E-5Tank Gp - Hydraulic Oil Note B 41 A-5

Valve Gp - Cooler Bypass Note B 43 A-8Valve Gp - Heavy Lift Solenoid Note B 44 A-4Valve Gp - LH Joystick Note B 45 C-8Valve Gp - Main Control Note B 46 C-1 thru C-6Valve Gp - Pilot Travel Note B 47 D-7, D-8Valve Gp - Pressure Reducing Boom/Swing Note B 48 B-3, B-4Valve Gp - RH Joystick Note B 49 C-7Valve Gp - Shuttle Note B 50 B-7, B-8Valve Gp - Swing Cushion Note B 51 E-6

Note A: Refer to parts manual for specific cylinder information.

Attachment

Standard 324D

Note B: Part numbers are located on the main Hydraulic System Schematic according to the effectivity of the machine.

Valve Gp - Travel LT Counterbalance Note B 52 E-5Valve Gp - Travel RT Counterbalance Note B 53 E-4

Cylinder Gp - Bucket Note A 23 F-8

SOS Hydraulic Oil Sampling Port A-3

D-5Block 201-9379 1

30 43 49 45 215038 37

39 47

461

48442820

353432

3153

2526 27 41

29

40

51

22 23

2224

43461 41

4945

24

353432

3052

3153

2951

23

32

263534

22

42 D-1, E-1Valve Gp - Check and Relief Note B

5

48442820

272625

40

52

2138 50

3739 47

27

25

5

C-1 Valve Gp - Solenoid 185-0472 6E-7Valve Gp - Load Control 225-4843 5D-1Valve Gp - Flow Control 201-9236 4D-1Valve Gp - Check 215-4919 3E-1Valve Gp - Check 215-4890 2

Sensor As - Head In Boom Cylinder Press. Note B 33 B-3

Switch As - Boom Down Pilot Pressure Note B 36 D-8

6

36

4

23

23

436

6

42

42

33

33

MACHINE COMPONENT LOCATIONS MAIN PUMP AND FILTER CIRCUITS

RE

NR

9107-0

22

4 P

ag

e,

(Dim

en

sio

ns

: 3

4 i

nc

he

s x

28

in

ch

es

)

DRAIN / RETURN LINE

HYDRAULIC CIRCUIT COLOR DESCRIPTIONSRIGHT MAIN PUMP OUTPUT

LEFT MAIN PUMP OUTPUT

LEFT & RIGHT MAIN PUMP POWERSHIFT CIRCUIT

PILOT PUMP OUTPUT

ATTACHMENT CONTROL CIRCUIT

SUPPLY LINE

BUCKET CYLINDER CONTROL CIRCUIT

RIGHT TRAVEL MOTOR CONTROL CIRCUIT

TRAVEL SPEED CONTROL CIRCUIT

STICK CYLINDER CONTROL CIRCUIT

BOOM CYLINDER CONTROL CIRCUIT

HEAVY LIFT CONTROL CIRCUIT

LEFT TRAVEL MOTOR CONTROL CIRCUITSWING MOTOR CONTROL CIRCUIT

SWING BRAKE CONTROL CIRCUIT

MEDIUM PRESSURE PUMP

FINESWING

VALVE GPMAIN CONTROL

MOTOR GPTRAVEL RIGHT

MOTOR GPTRAVEL LEFT

MOTOR GPSWING

FILTER GPPILOTHYDRAULIC

VALVE GPHEAVY LIFTSOLENOIDACCUMULATOR GP

FILTER GPRETURN OIL TANK GP

HYDRAULICOIL

VALVE GPPRESSREDUCINGBOOM/SWING

MANIFOLD GPCONTROL

FILTER GPCASE DRAIN

VALVE GPLH JOYSTICK VALVE GP

RH JOYSTICK

SWITCH AS.RH TRAVELPRESSURESWITCH AS.

LH TRAVELPRESSURE

SWITCH AS.PILOT PRESS

VALVE GPCOOLER BYPASS

VALVE GPSHUTTLE

SENSORAS RIGHTPUMPPRESSURE

PUMP GPMAIN HYD.

SENSORAS LEFT PUMPPRESSURE

BLOCK

VALVE GPPILOT TRAVEL VALVE GP

SWINGCUSHION

VALVE GPTRAVEL RTCOUNTERBALANCE

VALVE GPTRAVEL LTCOUNTERBALANCE

SWIVEL GP

VALVE GPPRESSREDUCINGBOOM/SWING

VALVE GPCHECK & RELIEF

VALVE GPCHECK & RELIEF

VALVE GPSOLENOID &PRESSUREREDUCINGBOOM/SWINGPRIORITY

VALVE GPCHECK SOLENOID215-4890

VALVE GPCHECK SOLENOID215-4919

VALVE GPFLOW CONTROL201-9236

VALVE GPSOLENOID185-0472

SWITCH ASBOOM DOWNPILOTPRESSURE

SENSOR ASHEAD IN BOOMCYCLINDERPRESSURE

12345678

A

C

D

E

F

12345678

A

B

C

D

E

F

B

TRAVEL(L) TRAVEL(R)

T1 T5BACKFWDBACK FWD

T2 T4 T6 T3

JLP JLT

STICK SWING

OUTJL1

INJL3

R LJL2 JL4

BUCKET BOOM

OPEN CLOSE DOWN UPJR1JR2 JR3JR4

A1 A2 A3 A4 A5 A6 A7 A8

B1 B2 B3 B4 B5 B6 B7 B8

TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)

T1

Pp3Pp3

T1

ABA B

BOOMCYLINDER

BUCKETCYLINDER

BOOMCYLINDER

SWING MOTOR

JRPJRT

T

TTTP

P2 Pi1

P1

DR1

DR2

DR3 DR4 DR5 DR6

P-IN PSA1PSA2

T-OUT1

T-OUT2

Pi2

P1 P2

T

A1 A2B1 B2

INOUT

PG PC

PAC

T AL4 aL4 R3aR5AR5BR5

AR2BR2aR2aL3

M2G2

G1 M1

A3

A1

S1

S3

A2

Pm

Pi

Pn1

Pn2

Ps2

Ps1PsM1

Dr1

Dr2

PsM2

Di2 Pi2 Pi3 Di3 DST bR2 Di1 bR5

A

T P

Pi5

Pi4Di4

T2 T2

G4

DrM

G3

BLOCK201-9379

AB

Dr

Dr

AB

A

P T

A

B

AGBG BG AG

PG

DR

MU

BG AG

B A

B1

P

T

STICKCYLINDER

TCV Pi

CYLVALVE GPLOAD CONTROL225-4843

CYL

X

Dr

CV Pi T

X

CYL

CV Pi T

XX

Dr Dr

aL1 bL1 bR1 aR1

AR3 BR3

AL2BL2

aR3 aR4-a bR3 bR4 bL3 bL2 bL4 aL2

AR1BR1AL1BL1

R.C.V-C

R.C.V-B

R.C.V-A D E F

G

NO

.1

(TR

AVE

L)

NO

.2(S

WIN

G)

NO

.3(L

OC

K)

AL3

AL1AL2

BL1BL2

aL2

aR1

AR1

BR1 AR3BR3

aL1

aR3 aR4R.C.V-A

R.C.V-B

PL

PR

R.C.V-C

bL3 bR3 bR4bL4 PRPLbL2 bL1

bR1

HR

HL

HR

HL

SOL

aR4-a

aR4Pi1

SOL Pi1

μ μ μμ μ μ μμ

μ μ μμ

DRA1B1

AL3

(UP) (IN) (L) (BACK) (BACK) (CLOSE) (DOWN) (IN)

BO

OM

(1)

ATC

H

BU

CK

ET

TRAV

EL(

R)

TRAV

EL(

L)

SW

ING

STI

CK

(1)

BO

OM

(2)

(OUT) (R) (FWD) (FWD) (OPEN) (UP) (OUT)

AR4

BP3 BP2

STI

CK

(2)

SP1 ST

BL3 BR4BP1 BT

SP2SP3

R2 R1

HH

JJ

KK

SOSGG

THIS SCHEMATIC IS FOR THE 320D EXCAVATORPART #: 239-8678 HE CHG 00Components are shown installed on a fully operable machinewith the key and engine off and transmission shifter in neutral.

LINE PATTERNS

Drain / Return LinesComponent Group

Pilot / Load Sensing PressurePressure Line

AttachmentAir Line

CALLOUTSTaps (Pressure, Sampling,Sensor) by letter

Components by number

YY

52

Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations

R.C.V :NOTES

EE

FF

RETURN CHECK VALVE