INTERACTIVE SCHEMATIC

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Cover PageInformation

SchematicMachine Views

Component TableTap Table

Fluid Power Symbols

Electrical Symbols

Front Frame

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Tap Views

Features

Options

Bookmarks X

EC-C3EC-C2 E-C60

EC-C1

E-C61

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SENR9249-06December 2012

320B ExcavatorHydraulic System320B:3MR1-UP5BR1-UP9KR1-UP1CS1-UP4XW1-UP

320B N:4NR1-UP

320B L:4MR1-UP6CR1-UP5CS1-UP5GW1-UP2WZ1-UP

Printed in U.S.A. 2012 Caterpillar, All Rights Reserved

COMPONENT LOCATION

DescriptionPart

NumberMachineLocation

SchematicLocation

AccumulatorGp 087-4456 1 B-4CoolerGp-HydraulicOil 109-9496 2 A-6CylinderGp-Boom 118-3949 3 E-3CylinderGp-Bucket 134-6987 4 E-3CylinderGp-Stick 123-2082 5 E-7FilterGp-CaseDrain 126-2075 6 A-6FilterGp-Pilot 4I-3741 7 A-3FilterGp-Return 107-6995 8 A-5MotorGp-Swing 176-5104 9 F-6MotorGp-Travel(Left) 107-7029 10 F-5MotorGp-Travel(Right) 107-7029 11 F-4SensorAs-Pressure 106-0178 12 B-2SwitchAs-BoomRaisePressure 106-0180 13 C-6SwitchAs-Implement/SwingPressure 106-0179 14 D-4SwitchAs-TravelPressure 106-0179 15 D-4TankGp-Hydraulic 118-4113 16 A-5ValveAs-BypassCheck 094-6526 17 A-6ValveGp-Check 184-3831 18 A-6ValveGp-CushionCrossoverRlf 116-3420 19 E-6ValveGp-FlowControl 111-1141 20 B-6ValveGp-HydraulicActivationControl 107-7058 21 A-6ValveGp-MainControl 154-0529 22 D-2ValveGp-Pilot 123-2419 23 D-2ValveGp-PilotControl(Bucket/Boom) 176-4985 24 B-3ValveGp-PilotControl(Swing/Stick) 176-4986 25 B-6ValveGp-PilotControlTravel 123-2148 26 B-7ValveGp-PilotOilManifold 111-9950 27 B-5ValveGp-StickDriftReduction 155-7067 28 D-5ValveGp-TravelBrake(Left) 137-3718 29 E-5ValveGp-TravelBrake(Right) 137-3718 30 E-4

TAP LOCATION

AA Drive Pump Powershift Pressure A-2BB Idler Pump Powershift Pressure B-1CC Idler Pump Delivery Pressure B-1DD Drive Pump Delivery Pressure A-1

SOS Hydraulic Oil Sampling Port A-3

TapNumber Description

SchematicLocation

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

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

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

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

SCHEMATIC PART NUMBER: 115-9034, CHANGE: 10, VERSION: HEMEDIA NUMBER: SENR9249-06THIS SCHEMATIC IS FOR THE 320B EXCAVATOR HYDRAULIC SYSTEM

A

B

C

D

E

F

1234567

A

B

C

D

E

F

1234567

SOS

AA

DD

CC

BB

STICK SWING

BOOMBUCKET

JR1JR3

JR2JR4

JRTJRPJL4

JL2JL1

JL3

JLTJLP

Pp3

T T

ABBA

TRAVEL MOTOR (RIGHT)TRAVEL MOTOR (LEFT)

AR1

BR1

ST

AL2BL2

X

DR

R2

HL

dL5

aL5aL4AL3BL3aL3

aL2

AL1BL1aL1PSWaR1aR2AR2BR2aR3dR4

Y

HR

AR4

R1

dSW bR2 bR1 dST1 PLPR PP bL1 PATbL2 bL3 PiB bL4

BOOM (1)BUCKET

ATCHTRAVEL (R)

PiLbR3aR4

SA5 SA4 SA3 SA2SA1

SB5 SB4 SB3 SB2 SB1SP

(F)BP1 BT

BPi

BP3

(F)(B)(R)(L)

SWING

(B)AL4

J

R1

S

R2

X1

X2

M3

X3 A1

M1

A2

M2

R1

A3

AP2

DR

2

PAC

PS

A

DR

3 Pi3

DR

1

TOU

T

PG

PG

PIN

JPi

Pi5Pi8 C/V

PE

U

DR

4

DR

5

Pi2

(LEVELING)

Pi1

DR

6

(TRAVEL)

(SWING)(PUMP)

(RELIEF)

R3

R4

R3AR3

STICK (1)

STICK (2)

BOOM (2)

TRAVEL (L)

AP1

PTA

AT

MOTOR

MU

DR

TT

AB

TP

TRAVEL (R)TRAVEL (L)

TLA2

BDr

TLA1 TRA1TRA2

PSL

APi

BL4

BR3

ADr

BP2

(9) MOTOR GPSWING176-5104VALVE GP

SOLENOID(SWING PARKING BRAKE)

(5) CYLINDER GPSTICK

123-2082

(19) VALVE GPCUSHION CROSSOVERRLF116-3420

(10) MOTOR GPTRAVEL (LEFT)

107-7029

(29) VALVE GPTRAVEL BRAKE (LEFT)

137-3718

(11) MOTOR GPTRAVEL (RIGHT)107-7029

(30) VALVE GPTRAVEL BRAKE (RIGHT)137-3718

SWIVEL

(4) CYLINDER GPBUCKET134-6987

(3) CYLINDER GPBOOM

118-3949

BOOM DRIFTREDUCTION

VALVE LINE RELIEFVALVE(BOOMCYLINDERHEAD END)

(23) VALVE GPPILOT123-2419

STICK (2)CONTROL VALVE

BOOM (1)CONTROL

VALVE

LINE RELIEF VALVE(BUCKET CYLINDER ROD END)

LINE RELIEF VALVE(BUCKET CYLINDER HEAD

END)

BUCKETCONTROL

VALVE

ATTACHMENTCONTROL

VALVE

(14) SWITCH ASIMPLEMENT/

SWING PRESSURE106-0179

(15) SWITCH ASTRAVEL PRESSURE

106-0179

(22) VALVE GPMAINCONTROL154-0529

MAINRELIEFVALVE

STRAIGHTTRAVELCONTROLVALVE

LEFTTRAVELCONTROLVALVE

(28) VALVE GPSTICK DRIFTREDUCTION155-7067

LINE RELIEFVALVE(STICK

CYLINDERHEAD END)

BOOM (2)CONTROLVALVE

(13) SWITCH ASBOOM RAISEPRESSURE106-0180

(26) VALVE GPPILOT CONTROL

(TRAVEL)123-2148

(25) VALVE GPPILOT CONTROL(SWING/STICK)

176-4986(20) VALVE GPFLOW CONTROL

111-1141

(6) FILTER GPCASE DRAIN

126-2075

(21) VALVE GPHYDRAULICACTIVATION

CONTROL107-7058

(18) VALVE GPCHECK

184-3831

(2) COOLER GPHYDRAULIC OIL

109-9496

(17) VALVE ASBYPASS CHECK

094-6526

(8) FILTER GPRETURN107-6995

(16) TANK GP HYDRAULIC 118-4113

(27) VALVE GPPILOT OILMANIFOLD111-9950

(1) ACCUMULATOR GP087-4456

SOLENOIDVALVE

(FINECONTROL)

SOLENOID VALVE(TRAVEL SPEED)

SOLENOIDVALVE(SWING

PRIORITY)

PROPORTIONALREDUCING VALVE

(POWERSHIFT)

PILOT RELIEFVALVE

(25) VALVE GPPILOT CONTROL(BUCKET/BOOM)

176-4985

(7) FILTER GPPILOT

4I-3741

IDLERPUMP

DRIVEPUMP

(12) SENSOR ASPRESSURE106-0178

PILOT PUMP

RIGHTTRAVEL

CONTROLVALVE

PM

MACHINE COMPONENT LOCATIONS

SOLENOID VALVE(SWING PARKINGBRAKE)

IDLER PUMP

DRIVE PUMP

PILOT PUMP

SWIVEL

30

29

27

2624222120

19

1612

1110

9

5

4

3

2

MAIN CONTROL VALVE

MAIN RELIEF VALVE

LINE RELIEFVALVE

(BUCKETCYLINDER

HEAD END)

STICK (2)CONTROL

VALVE

BOOM (1)CONTROL VALVE

ATTACHMENTCONTROL VALVE

STRAIGHT TRAVELCONTROL VALVE

LEFT TRAVELCONTROL VALVE

BOOM (2)CONTROL VALVEMAIN

RELIEF VALVE

LINE RELIEF VALVE(STICK CYLINDERHEAD END)

RIGHT TRAVELCONTROL VALVE

BUCKETCONTROL VALVE

28

2318

17

15

14

13

PUMP GP - MAIN HYDRAULIC

HYD.TANK

SOS

DD CC

BB

AA

8

7

6

PILOT MANIFOLD

PILOTRELIEF VALVE

SOLENOID VALVE(TRAVEL SPEED)

SOLENOID VALVE(SWING PRIORITY)

PROPORTIONALREDUCING VALVE(POWER SHIFT)

SOLENOID VALVE(FINE CONTROL)

25 1

FeaturesCover PageInformationComponent LocationTap LocationFluid Power SymbolsElectrical Symbols

SchematicMachine ViewsMachine Component LocationsMain Control ValvePump GP - Main HydraulicPilot Manifold

b_04_grid: e_03_grid:

e_07_grid: a_06_grid:

f_06_grid: f_05_grid: f_04_grid: b_02_grid: c_06_grid: d_04_grid:

a_05_grid:

e_06_grid: d_02_grid:

b_03_grid: b_06_grid:

b_07_grid: b_05_grid: d_05_grid: e_05_grid: e_04_grid: a_02_grid: b_01_grid:

a_01_grid: a_03_grid:

016_a_05_grid_v01: 012_b_02_grid_v01: 011_f_04_grid_v01: 010_f_05_grid_v01: 009_f_06_grid_v01: 005_e_07_grid_v01: 004_e_03_grid_v01: 003_e_03_grid_v01: 002_a_06_grid_v01: 030_e_04_grid_v01: 029_e_05_grid_v01: 027_b_05_grid_v01: 026_b_07_grid_v01: 024_b_03_grid_v01: 022_d_02_grid_v01: 021_a_06_grid_v01: 020_b_06_grid_v01: 019_e_06_grid_v01: 028_d_05_grid_v02: 023_d_02_grid_v02: 018_a_06_grid_v02: 017_a_06_grid_v02: 015_d_04_grid_v02: 014_d_04_grid_v02: 013_c_06_grid_v02: 035_a_03_grid_v03: 034_a_01_grid_v03: 033_b_01_grid_v03: 032_b_01_grid_v03: 031_a_02_grid_v03: 008_a_05_grid_v03: 007_a_03_grid_v03: 006_a_06_grid_v03: 025_b_06_grid_v04: 001_b_04_grid_v04: 0001_grid_spacer: 034_callout:

031_callout:

007_callout:

035_callout:

008_callout:

016_callout:

002_callout:

021_callout:

006_callout:

017_callout:

018_callout:

032_callout:

033_callout:

012_callout:

024_callout:

001_callout:

027_callout:

020_callout:

025_callout:

026_callout:

013_callout:

022_callout:

023_callout:

014_callout:

015_callout:

028_callout:

003_callout:

004_callout:

030_callout:

029_callout:

019_callout:

005_callout:

011_callout:

010_callout:

009_callout:

restore_callouts: