320B 322B 325B Excavator Hydraulic System

RENR3278 August1998

FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS

MAINAUX.

PUMP orMOTOR

SPRING

CONTROLVALVES

LINE RESTRICTION (VARIABLE)

PRESSURE COMPENSATION

FLUIDCONDITIO NER

SPRING (ADJUSTABLE)

VARIABILITY

LINE RESTRICTION (FIXED)

 TWOPOSITION

PUMP:VARIA BLE nd a PRESSURECOMPENSAT ED ED

2-SECTIONPUM P

HYDR A U LCI PNEU MAT IC ENERGY TRIANGLES

LINE RESTRICTION

ATTACHMENT

VARIABLEandPRESSURE COMPENSATED

VALVES

VALVE ENVELOPES

ONE POSITION

RESTRICTION

VALVE PORTS

 TWO-WAY

 THREE POSITION

FOUR-WAY

 THREE-WAY

CONTROLVALVES

CHECKVALVES

AB

AB

P T NORMALPOSITION

P T S HFI T ED P O STI I ON

I N FI NTI EP O SI T O I N

BASIC SYMBOL

SHUTTLE

SPRING LOADED

PILOT CONTROLLED

FLUID STORAGE RESERVOIRS

V E NT ED

320B, 322B a nd 325B Excavator  Hydraulic System 320B: 1XS1-UP 7JR1-UP 2AS1-UP 9WS1-UP 5MS1-UP 6LW1-UP 3YZ1-UP

322B: 2ES1-UP 1ZS1-UP

325B: 6DN1-UP 8FN1-UP 4DS1-UP 5BS1-UP

RETURNABOVE FLUIDLEVEL

P RES S UR Z IE D

RETURNBELOWFLUIDLEVEL

MEASUREMENT

PRESSURE

ROTATING SHAFTS

FLOW

 TEMPERATURE

UNIDIR EC TIONAL

BIDIRECTIONAL

COMBINATION CONTROLS

SOLENOID

SOLENOID orMANUAL

SOLENOIDand PILOTorMANUAL

SOLENOID andPILOT

SERVO

THERMAL

DETENT

MANUALCONTROLSYMBOLS

P USH-P ULL LEVER

MANUALSHUTOFF

GENER AL MANUAL

EXTERNALRETURN

INTERNALRETURN

SPRINGLOADED

CROSSINGANDJOININGLINES

GAS CHARGED

LINESCROSSING

HYDRAULICPUMPS FIXED DISPLACEMENT

P EDAL

FIXED DISPLACEMENT

LINES JOINING

SINGLEACTING

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

DOUBLEACTING

INTERNAL PASSAGEWAYS

VARIABLEDISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

INTERNAL SUPPLY PRESSURE

COMPLETE

HYDRAULICANDPNEUMATICCYLINDERS

HYDRAULICMOTORS

VARIABLEDISPLACEMENT NON-COMPENSATED

SP RING

REMOTE SUPPLY PRESSURE

SIMPLIFIED

ACCUMULATORS

VA Boom

PUSH BUTTON

PILOT CONTROLSYM BOLS

RELEASEDPRESSURE

 THREE POSITION

INFINITE POSITIONING

FLOWINONE DIRECTION

PARALLEL FLOW

 TWO POSITION

CROSS FLOW

©1998Caterpillar AllR ights Reserved

FLOWALLOWEDIN EITHER DIRECTION

Printedin U.S.A.

Electrical Symbols Table HydraulicSymbols(Electrical)

M

G  Transducer (Fluid)

 Transducer (Gas /Air)

Pressure Switch (Adjustable)

Pressure Switch

Generator

ElectricMo tor

ElectricalW ire

 TemperatureSwitch ureSwitch

ElectricalSymbols(Electrical)

 T

Pressure Symbol

 Temperature Symbol

Level Symbol

Flow Symbol

Wire Number Identification Codes

Electrical Schematic Example

Hydraulic Schematic Example CurrentStandard

CurrentStandard Harnessidentificationcode  Thisexampleindica tes tes wire135inharness"AG".

Wire Circuit Number Identification

WireColor

325-AG135PK-14 325-PK  CircuitI dentification Number

WireColor

WireGauge

Previous Standard WireColor

Wire

325-PK-14 B CircuitN umber Identification

A

WireGauge (EXAMPLE VALVE)

   )   s   e    h   c   n    i    4    2   x   s   e    h   c   n    i    4    3   :   s   n   o    i   s   n   e   m    i    D    (

   8    7    2    3    R    N    E    R  e ,

  g   a    P    6    1

7

   )   s   e    h   c   n    i   4    2   x   s   e    h   c   n    i   4    3   :   s   n   o    i   s   n   e   m    i   D    (

   8   7    2    3   R   N ,   E    2   r   o   R    l   o

   C  ,   e   g   a   P    6   1

6

5

4

3

2

1

E

E

D

D

C

C

B

B

A

A

 THIS SCHEMATIC IS FOR THE 320B, 322B AND325B EXCAVATORS PART NUMBER:149-2310 Componentsareshowninstalled ona fullyoperablemachine. Referto theappropriateServiceManual forTroubleshooting,Specifications andSystemsOperations.

7

6

5

4

3

2

1