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STEERINGCYLINDER

STEERINGHYDRAULIC

TANK

STEERINGCOOLERS

STEERINGCOOLING

PUMP

STEERINGCONTROL

VALVE

STEERINGPUMPS

COMPENSATORVALVE GROUP

PRESSUREREDUCING

VALVES

NEUTRALIZERVALVES

METERINGPUMP

STEERINGFILTER

SUPPLEMENTALSTEERING

PUMP

DIVERTERVALVE

994 WHEEL LOADER

STEERING SYSTEM

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V-3COMPONENTS

BRAKE OIL

COOLING

TANK

IMPLEMENT

OIL COOL-

ING FILTER

STEERING

AND BRAKE

COOLING

FILTER

STEERING

AND BRAKE

OIL TANK

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V-4PUMP COMPONENTS

RIGHT

STEERING

PUMP

LEFT

STEERING

PUMP

BRAKE

COOLING

PUMP

PUMP

COMPENSATOR

PUMP

COMPENSATOR

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SWASHPLATE

LARGEACTUATOR

PISTON

STEERING PUMP ANDCOMPENSATOR VALVE

LOW PRESSURE STANDBY

FROM STEERINGCONTROL VALVE

FLOWCOMPENSATORSPOOL

PRESSURECOMPENSATORSPOOL

CONPENSATOR VALVE

SMALLACTUATOR PISTON

MINIMUM ANGLESTOP

MAXIMUM ANGLE

STOP

CHARGEPUMP

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SWASHPLATE

LARGEACTUATOR

PISTON


UPSTROKE




CONPENSATOR VALVE


MINIMUM ANGLESTOP

MAXIMUM ANGLESTOP

CHARGEPUMP

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SWASHPLATE

LARGEACTUATOR

PISTON


CONSTANT FLOW




CONPENSATOR VALVE


MINIMUM ANGLESTOP

MAXIMUM ANGLE

STOP

CHARGEPUMP

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SWASHPLATE

LARGEACTUATOR

PISTON


DESTROKE




CONPENSATOR VALVE


MINIMUM ANGLESTOP

MAXIMUM ANGLE

STOP

CHARGEPUMP

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SWASHPLATE

LARGEACTUATOR

PISTON


RELIEF




CONPENSATOR VALVE


MINIMUM ANGLESTOP

MAXIMUM ANGLE

STOP

CHARGEPUMP

V-9

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ORIFICE 2

FROM RIGHTSTEERING PUMP

DRAIN PASSAGE

SHIMS

FROM LEFTSTEERING PUMP

ANDSUPPLEMENTALSTEERING VALVE

TO HMUSTEERING OIL

PRESSURESWITCH

VALVE SPOOL

ORIFICE 1

VALVE 1VALVE 2

SELECTOR AND PRESSURE CONTROL VALVES

V-10

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L R PT

CONTROLSECTION

SLEEVE

SPOOL

DRIVEPIN THERMAL BLEEDPASSAGES

CENTERINGSPRINGS

METERINGSECTION

ROTOR

STATOR

HAND METERING UNITNEUTRAL

V-11

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L R PT

L R PT

HAND METERING UNIT

METERINGSECTION

CONTROLSECTION

SPOOL

ROTOR

STATOR

CENTERINGSPRINGS

LEFT TURN

RIGHT TURN

V-12

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TOSTEERINGCONTROL

VALVEFROM HMU

CHECK VALVE

SPRINGVALVE SPOOL

FROMSTEERINGCONTROL

VALVETO HMU

CHECKVALVE

SPRING

VALVE SPOOL

NEUTRALIZER VALVE

LESS THAN MAXIMUM TURN

MAXIMUM TURN

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STEERING CONTROL VALVE

HOLD

CONTROLSPOOL

RELIEF VALVE

DOUBLE CHECK VALVE

SIGNALPASSAGE

FROMHMU

FROMHMUTO STEERING

CYLINDERS

TO STEERING

CYLINDERS

FROM STEERING PUMPS

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STEERING CONTROL VALVE

RIGHT TURN

CONTROLSPOOL

RELIEFVALVE

DOUBLE CHECK VALVE

SIGNALPASSAGE

FROMHMU

FROMHMUTO STEERING

CYLINDERS

FROM STEERING

CYLINDERS

TO TANK

FROM STEERING PUMPS

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STEERING SYSTEMHOLD

STEERING AND

BRAKE TANK

LEFTNEUTRALIZER

VALVE

RIGHTNEUTRALIZER

VALVE

HAND METERING UNIT

STEERINGCONTROL VALVE

STEERINGCYLINDERS

LINERELIEFVALVES

RIGHT PUMP

RIGHT PUMP COMPENSATOR VALVE

PRESSURE ANDSELECTOR VALVES

CHECKVALVE

CHECKVALVE

LEFT PUMPCOMPENSATOR VALVE

CHECKVALVE

LEFT PUMP V-16

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STEERING SYSTEMGRADUAL RIGHT TURN

STEERINGCYLINDERS

LINERELIEFVALVES

DOUBLECHECKVALVE

NEUTRALIZERVALVES

HANDMETERING

UNIT

PRESSUREAND

SELECTORVALVE 2

PRESSUREAND

SELECTORVALVE 1

RIGHT PUMPCOMPENSATOR

VALVE

LEFT PUMPCOMPENSATOR

VALVE

CHECKVALVE

CHECKVALVE

RIGHT PUMP

LEFT PUMP

STEERING ANDBRAKE TANK

RELIEFVALVE

V-17

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STEERING SYSTEM WITH SUPPLEMENTAL STEERINGDIFFERENTIAL PRESSURE BELOW 1220 kPa (175 psi)

REVERSING

SPOOL INLETCHECKVALVES

SUPPLEMENTALPUMP

FLOWCHECKVALVES

OUTLET CHECK VALVE

DIVERTERSPOOL RELIEF

VALVE

NEUTRALIZERVALVES

HANDMETERING

UNIT

PRESSUREAND

SELECTORVALVE 2

PRESSUREAND

SELECTORVALVE 1


VALVE

LEFT PUMP

COMPENSATORVALVE

RIGHT PUMP

LEFT PUMP


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STEERING SYSTEM WITH SUPPLEMENTAL STEERING

REVERSINGSPOOLINLET

CHECKVALVES

SUPPLEMENTALPUMP

FLOWCHECK

VALVES

OUTLET CHECK VALVE


VALVE

NEUTRALIZERVALVES

HAND

METERINGUNIT

PRESSUREAND

SELECTORVALVE 2

PRESSUREAND

SELECTORVALVE 1


VALVE

LEFT PUMPCOMPENSATORVALVE

RIGHT PUMP

LEFT PUMP


DIFFERENTIAL PRESSURE ABOVE 1220 kPa (175 psi)

V-19

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STEERING SYSTEM WITH SUPPLEMENTAL STEERING

REVERSINGSPOOLINLET

CHECKVALVES

SUPPLEMENTALPUMP

FLOWCHECK

VALVES

OUTLET CHECK VALVE


VALVE

NEUTRALIZERVALVES

HAND

METERINGUNIT

PRESSUREAND

SELECTORVALVE 2

PRESSUREAND

SELECTORVALVE 1


VALVE

LEFT PUMPCOMPENSATORVALVE

RIGHT PUMP

LEFT PUMP


ENGINE OFF

V-20

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STEERING COOLING SYSTEM

STEERINGCOOLER

PUMP

FLUIDSAMPLING

VALVE

FILTERFILTER

BYPASSVALVE

OIL COOLER CORES

COOLERBYPASSVALVE

V-21

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V-22

STEERING AND BRAKE OIL COOLERS

MODULES

MACHINE

RIGHT

SIDE6 5 4

IMPLEMENT OIL COOLERS

MODULES 677 5 4

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LEFTBRAKEPEDAL

RIGHTBRAKEPEDAL

RIGHT BRAKE

VALVE

PARKING BRAKEVALVE

BRAKEACCUMULATORS

LEFT FRONTSERVICE BRAKE

LEFT REARSERVICE BRAKE

RIGHT FRONTSERVICE BRAKE

RIGHT REARSERVICE BRAKE

PARKINGBRAKE

BRAKE OILCOOLER CORE GROUP

BRAKE

COOLINGPUMP

BREATHER

BREATHER

VARIABLEDISPLACEMENT

PISTON PUMP

PRESSURECOMPENSATOR

VALVE

PUMPACTUATOR

STEERING AND BRAKETANK

BRAKE COOLINGTANK

PRESSURE

RELEASE SPOOL

MANUALSPOOL

NEUTRALIZER VALVEFROM

TRANSMISSIONNEUTRALIZER VALVE BRAKE SYSTEM

ENGINE OFF

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PUMP SERVO VALVE CONTROL PISTON

CONTROL PISTON

PASSAGE

SPRING

SWASHPLATEPISTON ASSEMBLY

DRIVE SHAFT

BARREL

OUTLET PASSAGE

INLET PASSAGE

BRAKE PUMPLOW PRESSURE

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FROM PUMPOUTLET

TO CONTROLPISTON

ADJUSTMENTBOLT

LOCKNUT PRESSURE COMPENSATOR SPOOL

FROM PUMPOUTLET

TO CONTROLPISTON

ADJUSTMENTBOLT

LOCKNUT PRESSURE COMPENSATOR SPOOL

LOW BRAKE SYSTEM PRESSURE HIGH BRAKE SYSTEM PRESSURE

PUMP SERVO VALVE

V-25

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PUMP SERVO VALVE CONTROL PISTON

CONTROL PISTONPASSAGE

SPRING

SWASHPLATE

PISTON ASSEMBLY

DRIVE SHAFT

BARREL

OUTLET PASSAGE

INLET PASSAGE

BRAKE PUMPHIGH PRESSURE

V-26

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BRAKERELEASED

BRAKE CONTROLVALVE

PLUNGERSPRINGSSPOOL

PISTON SPRING

SUPPLYOIL

TOTANK

CHECK VALVE

TO SERVICE BRAKES AND

NEUTRALIZER VALVE

BRAKEENGAGED

PLUNGERSPRINGSSPOOL

CHECKVALVE

TO SERVICE BRAKESANDNEUTRALIZER VALVE

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TO DRAIN

TO TRANSMISSIONNEUTRALIZER VALVE

FROM BRAKECONTROL VALVE

TO BRAKE CONTROL VALVE

MANUALSPOOL

PRESSURERELEASE

SPOOL

TO DRAIN

FROM TRANSMISSIONNEUTRALIZER VALVE

FROM SERVICEVALVE

FROM BRAKE CONTROL VALVE

PRESSURERELEASE

SPOOL

MANUALSPOOL

TRANSMISSION ENGAGEDBRAKES SLOWLY DISENGAGED

LEFT BRAKE PEDAL RELEASEDTRANSMISSION DISENGAGED

BRAKES ENGAGED

LEFT BRAKE PEDAL DEPRESSED

NEUTRALIZER VALVES V-28

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DISC-TYPE

SPINDLE

PLATES

DISCS

PISTON

OIL CHAMBER

WHEELASSEMBLY

HOUSING

WHEEL BRAKE

V-29

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SEPARATOR PLATESDISCS

TOPARKINGBRAKE

CONTROLVALVE

PRESSUREPLATE

SPRINGS

DRIVESHAFT

RODS

BRAKE ENGAGED

MACHINEFRAME

DRIVE SHAFT

FROMPARKINGBRAKE

CONTROLVALVE

BRAKE RELEASEPISTON

SPRINGS

BRAKE RELEASED

PARKING BRAKEV-30

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BRAKE SYSTEM

LEFTBRAKEPEDAL

RIGHTBRAKEPEDAL

RIGHT BRAKEVALVE

PARKING BRAKEVALVE

BRAKEACCUMULATORS





PARKINGBRAKE


BRAKE COOLING PUMP

BREATHER

BREATHER

VARIABLEDISPLACEMENTPISTON PUMP

PRESSURECOMPENSATOR

VALVE

PUMPACTUATOR


BRAKE COOLINGTANK

FROMTRANSMISSION

NEUTRALIZER VALVE

PRESSURERELEASE SPOOL

MANUALSPOOL

NEUTRALIZER VALVE

RIGHT BRAKE APPLIED

V-31

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BRAKE SYSTEM

LEFTBRAKEPEDAL

RIGHTBRAKEPEDAL

RIGHT BRAKEVALVE

PARKING BRAKEVALVE

BRAKEACCUMULATORS





PARKINGBRAKE


BRAKE COOLING PUMP

BREATHER

BREATHER


PRESSURECOMPENSATOR

VALVE

PUMP

ACTUATOR


BRAKE COOLINGTANK

FROMTRANSMISSION

NEUTRALIZER VALVE


MANUALSPOOL

NEUTRALIZER VALVE

LEFT BRAKE APPLIED

V-32

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BRAKE SYSTEM

LEFTBRAKEPEDAL

RIGHTBRAKEPEDAL

RIGHT BRAKEVALVE

PARKING BRAKEVALVE

BRAKEACCUMULATORS





PARKINGBRAKE


BRAKE COOLING PUMP

BREATHER

BREATHER


PRESSURECOMPENSATOR

VALVE

PUMP

ACTUATOR


BRAKE COOLINGTANK

FROMTRANSMISSION

NEUTRALIZER VALVE


MANUALSPOOL

NEUTRALIZER VALVE

INSTANT LEFT BRAKERELEASES

V-33

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BRAKE COOLING SYSTEM

OILCOOLER




COOLERBYPASSRELIEF


V-34

V 35

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V-35BRAKE OIL COOLER

HOSE TO REAR BRAKES HOSE TO FRONT BRAKES BRAKE OIL COOLER

COOLER BYPASS VALVE COOLER BYPASS HOSE

5STEERBR

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