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966F & 966F Series II WHydraulic System1SL1-UP3XJ1-UP4YG1-UP8BG1 UP

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ONE POSITION TWO POSITION THREE POSITION

VENTED PRESSURIZED RETUR

SPRING CONTROL VAL

SPRING(ADJUSTABLE)

VARIABILITY LINE RESTRICTION(VARIABLE)

PRESSURCOMPENSA

MEASUREMENT

PRESSURE TEMPERATURE FLOW

MANUAL C

FLUID STO

VALVE ENVELOPES

BASIC COM

FLUID CONDITIONERPUMP or MOTOR

FLUID PO

SOLENOIDor MANUAL

SOLENOIDand PILOT

COMBINA

SOLENOID

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITIO

CONTROL VALVES

SENR4778-02October 1993

I Wheel Loaders

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POSITION

RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL

TWO-WAY THREE-WAY FOUR-WAY

CONTROL VALVES RESTRICTION LINE RESTRICTION(FIXED)

2-SECTION PUMP

MAIN AUX.

LINE RESTRICTIONVARIABLE and PRESSURE

COMPENSATED

PRESSURECOMPENSATION

PUMP: VARIABLE andPRESSURE COMPENSATED

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

ANUAL CONTROL SYMBOLS

LUID STORAGE RESERVOIRS

VALVE PORTS

ASIC COMPONENT SYMBOLS

UID POWER SYMBOLS

VALVES

DT

SOLENOID and PILOT or MANUAL

COMBINATION CONTROLS

SERVO THERMAL DETENT

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

NITE POSITION

ATTACHMENT

SHUTTLE PILOTCONTROLLED

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3XJ1-UP4YG1-UP8BG1-UP9YJ1-UP

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LINES CROSSING

PUSH-PULL LEVER G

MANUAL C

HYDRA

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULIC PUMPS

CROSSING

FIXEDDISPLACEMENT

UNID

BID

PILOT CORELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

ACCUMULATORS

SPRING LOADED GAS CHARGED

or MANUAL and PILOT

MANUAL SHUTOFF

© 1993 CaterpillarAll Rights Reserved

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78-0

2

CROSSING LINES JOINING

PEDALGENERAL MANUAL PUSH BUTTON SPRING

ANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

ROSSING AND JOINING LINES

XEDACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

PILOT CONTROL SYMBOLSREMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNALSUPPLY PRESSURE

T PILOT or MANUAL

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

TWOPOSITION

INFINITEPOSITIONING

FLOW IN ONEDIRECTION

FLOW ALLOWED INEITHER DIRECTION

THREEPOSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

Printed in U.S.A.

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SE

NR

4778

12 P

ag

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778-

02g

e

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SE

NR

4778

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Pag

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THIS SCHEMATIC ISComponents are shown instshifter in neutral.

Refer to the appropriate Ser

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EMATIC IS FOR THE 966F AND 966F SERIES II WHEEL LOADERSre shown installed on a fully operable machine with the key and engine off and transmission l.

propriate Service Manual for Troubleshooting, Specifications and Systems Operations

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