INTERACTIVE SCHEMATIC

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Electrical Symbols

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Bookmarks X

EC-C3EC-C2 E-C60

EC-C1

E-C61

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Hydraulic System320D and 320D L Excavator

2011 Caterpillar, All Rights Reserved Printed in U.S.A.

RENR7296-06September 2011

320D:JPD1-UPA6F1-UPFAL1-UPKLM1-UPPCM1-UPKHN1-UPBZP1-UPCXY1-UPJFZ1-UPJGZ1-UPKTF1-UP

320D L:MDE1-UPA8F1-UPA9F1-UPKGF1-UPMGG1-UPTDH1-UPDHK1-UPGDP1-UP

COMPONENT LOCATION

Description PartNumberMachineLocation

SchematicLocation

Accumulator GPCylinder GP - BoomCylinder GP - BucketCylinder GP - StickFilter GP - Pilot (Hydraulic Oil)Filter GP - Oil (Hydraulic Return)Filter GP - Oil (Hydraulic, Case Drain)Manifold GP - Control (Pilot Oil)Motor GP - SwingMotor GP - Travel (Left)

Pump GP - Piston (Main)Swivel GPValve GP - Check (Oil Cooler Bypass)Valve GP - Load Control (Boom)Valve GP - Load Control (Stick)Valve GP - Main ControlValve GP - Pilot (Joystick, LH)Valve GP - Pilot (Joystick, RH)Valve GP - Pilot (Travel)Valve GP - Pressure Reducing (Boom, Swing Priority)Valve GP - Shuttle 1

Valve GP - Swing CushionValve GP - Travel Counterbalance (Left)

Note A: Refer to Parts Manual for your specific machine.

Valve GP - Shuttle 2

Motor GP - Travel (Right)

Valve GP - Travel Counterbalance (Right)

164-6981NOTE ANOTE ANOTE A158-8987188-4140126-2075215-5037158-8986209-5992

272-6955234-4440201-9329255-5683255-5680259-7464270-5951270-5952270-5947232-4102185-0462259-7732158-9085137-3718

209-5992

137-3718

A-4E-2E-2E-7A-4A-6A-6A-5E-5

E-4A-2D-4A-7C-2C-5C-2C-7C-6D-7A-4B-7B-3D-5D-5

E-5

D-4

123456789

10

121314151617181920212223242526

11

TAP LOCATION

TapNumber Description

SchematicLocation

AA Pilot Filter Pressure Test PortBB Idler Pump Pressure Test PortCC Drive Pump Pressure Test PortDD Power Shift Pressure Test Port

SOS Hydraulic Oil Sampling Port

A-4B-3A-3A-2A-3

FLUID POWER SYMBOLS

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

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

SOLENOIDor MANUAL

SOLENOIDand 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

ELECTRICAL SYMBOLSHydraulic Symbols (Electrical)

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

PressureSymbol

TemperatureSymbol

LevelSymbol

FlowSymbol

Electrical Symbols (Electrical)

T

RE

NR

7296-0

61

6 P

ag

e,

(Dim

en

sio

ns

: 3

4 i

nc

he

s x

24

in

ch

es

)

A

B

C

D

E

1234567

A

B

C

D

E

1234567

HYDRAULIC CIRCUIT COLOR DESCRIPTIONSPILOT PUMP OUTPUT

COMBINED LEFT AND RIGHT PUMP SIGNAL PRESSURE

IMPLEMENT AND LEFT TRAVEL PUMP OUTPUTPOWER SHIFT CONTROL CIRCUITSUPPLY LINESHUTTLE VALVE CONTROL CIRCUITSTICK CONTROL AND STICK CYLINDER CIRCUITLEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUITATTACHMENT CONTROL CIRCUITSWING CONTROL AND SWING MOTOR CIRCUITDRAIN / RETURN LINESWING BRAKE CONTROL CIRCUITIMPLEMENT AND RIGHT TRAVEL PUMPTRAVEL SPEED CONTROL CIRCUITBUCKET CONTROL AND BUCKET CYLINDER CIRCUITRIGHT TRAVEL CONTROL AND RIGHT TRAVEL MOTOR CIRCUITBOOM CONTROL AND BOON CYLINDER CIRCUIT

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

CALLOUTS

Taps (Pressure, Sampling, Sensor - by letter)YY

(52) VALVE GP - CONTROL 138-1234

Callout Number(Machine Location from

Component LocationsTable)

ComponentName

Part Number

aR3

RCV-C

RCV-B

RCV-A

aR4 bR3 bR4 bL3 bL2 bL4 aL2

bL4bL3 bL2

bL1 bR1 bR3bR4

bR1 aR1aL1 bL1

aR3

aR4aR1

aL1aL2

AL3 BL3

AL2BL2

BR1BL1 AL1 AR1

AR3 BR3 AR4 BR4

BR3 AR3

AR4

BR4

BR1

AR1

AL1AL2

AL3BL3

BL2 BL1

TRAVEL(L) TRAVEL(R)

(20) VALVE GPPILOT (TRAVEL)

270-5947

T1 T5BACKFWDBACK FWD

T2 T4 T6 T3

JLP JLTSTICK 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

(4) CYLINDER GPSTICK

P2 Pi1 DR1

DR2

DR3 DR4 DR5 DR6

P-IN PSA1

PAC

PSA2

T-OUT1

T-O

UT2

Pi2

A

CB

D E F

G

(14) VALVE GPCHECK (OIL COOLER BYPASS)

201-9329

(6) FILTER GPOIL (HYDRAULIC RETURN)

188-4140

(7) FILTER GPOIL (HYDRAULIC, CASE DRAIN)

126-2075

(22) VALVE GPSHUTTLE 1

185-0462

(8) MANIFOLD GPCONTROL (PILOT OIL)

215-5037

JRT

(18) VALVE GPPILOT (JOYSTICK, LH)

270-5951

(19) VALVE GPPILOT (JOYSTICK, RH)

270-5952

(1) ACCUMULATOR GP164-6981

NO

.1

(TR

AVE

L)

NO

.2(S

WIN

G)

NO

.3(L

OC

K)

TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)

Pp3

BG

Pp3

BG

T1

T2

T1

T2

AG AG

ABA B

(3) CYLINDER GPBUCKET

(2) CYLINDER GPBOOM

M2G2

G1 M1A3

A1

S1

S3

A2

Pm

Pi

Pn1

Pn2

Ps2

Ps1PsM1

Dr1

Dr2

DrM

PsM2

HL Di2

STICK(2)BOOM(1)ATCH BUCKETTRAVEL(R)TRAV

EL(

L)

SWINGSTI

CK

(1)

BOOM(2)

Pi2 Pi3 Di3 DST PL PR bR2 Di1 HR

AL4

SEE LOC A-7

SEE LOC A-7

aL4

SPiSD

r

SP3

Di4 Pi4 Pi1

BP3 BD

r

BP

i

R3aR5AR5BR5

BTBP1

AR

2B

R2

aR2

(UP)

(OUT)

(IN)

(R)

(L)

(FWD)

(REV)

(FWD)

(REV)

(OPEN)

(CLO

SE

)

(UP)

(DOWN)

(OUT)

PG

DR

MU

BG AG

AB

SWING MOTOR

P1 P2

T

A1 A2B1 B2

aL3

(9) MOTOR GPSWING158-8986

(24) VALVE GPSWING CUSHION158-9085

(10) MOTOR GPTRAVEL (LEFT)

209-5992

(25) VALVE GPTRAVEL COUNTERBALANCE (LEFT)

137-3718

(11) MOTOR GPTRAVEL (RIGHT)209-5992

(26) VALVE GPTRAVEL COUNTERBALANCE (RIGHT)137-3718

(13) SWIVEL GP234-4440

(15) VALVE GPLOAD CONTROL (BOOM)255-5683

(16) VALVE GPLOAD CONTROL (STICK)

255-5680

(17) VALVE GPMAIN CONTROL259-7464

(12) PUMP GPMAIN272-6955

RCV: RETURN CHECK VALVE

(5) FILTER GPPILOT (HYDRAULIC OIL)158-8987

bR5

INOUT

T

DR A1B1

PG

U

FRRR(21) VALVE GPPRESSURE REDUCING(BOOM, SWING PRIORITY)232-4102

(23) VALVE GPSHUTTLE 2259-7732

PC

P1

JRP

T

BP2

PUMPRIGHT

PUMPLEFT

PILOT

I

D

TRAVEL BRAKETRAVEL BRAKE

PRESSURE SWITCH PRESSURE SWITCH

PRESSURE SWITCH

SLOWRETURN BYPASS

OIL COOLER

TRAVELSPEED

SWINGPRIORITY

ACTIVATION

HYDRAULIC

PRESSURESENSOR

PROPORTIONALREDUCING VALVE

MAINRELIEF

PRESSURE SENSOR

RCV-C

RCV-A

RCV-BSEE LOC A-7

SEE LOC C-2

SEE LOC E-6

SEE LOC C-6

HL

HR

PL

PL

PR

PRHL

HR

AA SOSCC

BB

DD

Components are shown installed on a fully operable machine with the key and engine off,and with parking brake set.Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.

SCHEMATIC PART NUMBER: 259-7469, CHANGE: 01, VERSION: HEMEDIA NUMBER: RENR7296-06 THIS SCHEMATIC IS FOR THE 320D AND 320D L EXCAVATOR HYDRAULIC SYSTEM

MACHINE COMPONENT LOCATIONS

26

2322

21

201918

14

11

8

4

3

2

1

FILTER GP

SOS AA7 6 5

MOTOR GP - PISTON (TRAVEL)

25

10

MOTOR GP - SWING AND SWIVEL

24 139

PUMP GP - PISTON (MAIN)

DD

CC

BB

12

VALVE GP - MAIN CONTROL

17

1615

FeaturesCover PageInformationComponent LocationTap LocationFluid Power SymbolsElectrical Symbols

SchematicMachine ViewsMachine Component LocationsFilter GpMotor Gp - Piston (Travel)Motor Gp - Swing And SwivelPump Gp - Piston (Main)Valve Gp - Main Control

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e_02_grid:

a_04_grid:

a_06_grid:

e_05_grid:

c_02_grid:

d_05_grid:

d_04_grid:

a_03_grid:

a_02_grid:

b_03_grid:

a_05_grid: a_07_grid: b_07_grid: c_05_grid: c_06_grid: c_07_grid: d_07_grid: e_04_grid: e_07_grid: 001_a_04_grid_v01: 002_e_02_grid_v01: 003_e_02_grid_v01: 004_e_07_grid_v01: 008_a_05_grid_v01: 011_e_04_grid_v01: 014_a_07_grid_v01: 018_c_07_grid_v01: 019_c_06_grid_v01: 020_d_07_grid_v01: 021_a_04_grid_v01: 022_b_07_grid_v01: 023_b_03_grid_v01: 026_d_04_grid_v01: 006_a_06_grid_v02: 007_a_06_grid_v02: 005_a_04_grid_v02: 025_d_05_grid_v03: 010_e_05_grid_v03: 013_d_04_grid_v04: 009_e_05_grid_v04: 024_d_05_grid_v04: 012_a_02_grid_v05: 015_c_02_grid_v06: 017_c_02_grid_v06: 016_c_05_grid_v06: 027_a_04_grid_v02: 031_a_03_grid_v02: 028_b_03_grid_v05: 030_a_02_grid_v05: 029_a_03_grid_v05: 0001_grid_spacer: restore_callouts: