manual completo d8r

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© 1998 Caterpillar Inc.

• Dual twist tiller with integratedspeed selector and parkingbrake

• Steering motor with internalflushing valve

• Crossover and makeup valvesreplace counterbalance valve

• Steering controlled by remotepilot valve

• Piston-type pump for steeringonly

D8N/D8R Two Pump

• Tiller control with separatespeed selector and parkingbrake

• Steering motor without internalflushing valve

• Counterbalance valve toprevent overspeeding

• Steering control valveintegrated with implementcontrol valve

• Piston-type pump for steeringand hydraulics

D8N One Pump

STEER SYSTEM COMPARISON

D8N One Pump D8N/D8R Two Pump

• Piston-type pump forsteering and implements

• Load sensing, pressurecompensated hydraulicswith steering priority

• Standard Caterpillarcylinders

• Individual quick-dropvalve for each lift cylinder

• Individual ripperfunction valves

• Piston-type pumpfor implements only

• Load sensing, pressurecompensated hydraulics

• Threaded gland liftand pin puller cylinders

• Single quick-drop valvesimilar to the D6R/D7R

• One control valve with pilot operated diverter for all ripper functions

HYDRAULIC SYSTEM COMPARISON

ADDITIONAL CHANGES

• Folded core radiator

• Two section transmissionpump

• 3406B DIT 212.5 kW (285 hp)

• Two low maintenance,high output batteries

• Fuel level dipstick

• Mechanical hourmeter

D8N One Pump D8N Two Pump D8R Two Pump

• Improved Multiple RowModule (IMRM) radiator

• Three section transmissionpump (added torqueconverter charging section)

• Improved operator's station

• 3406C DITA 212.5 kW (285 hp)

• Four heavy-duty,maintenance free batteries

• Fuel level gauge on dash• Electronic LCD hourmeter

• Advanced ModularCooling System (AMOCS)

• No Change

• No Change

• 3406C DITA 228 kW (305 hp)

• No Change

• No Change• No Change

• Seven ecology drains

• Torque rise @ 34% • Torque rise @ 25% • Torque rise @ 25% and emissions certified

• Four ecology drains

OPTIONAL EQUIPMENT

• Air Conditioning (R-134a)

• Fast fill fuel system

• Fast oil change systemfor engine and transmission

• Dual tilt cylinders on 8A angle dozerwith tilt blade

• 58 Winch

• Engine pre-lubrication system

D8R AIR INLET ANDEXHAUST SYSTEM

MUFFLER

TURBOCHARGER

AFTERCOOLER

PRECLEANER

CYLINDER

AIRCLEANER

COMPRESSOR WHEEL

TURBINE WHEEL

DUST EJECTOR LINE

EXHAUSTMANIFOLD

HEAD ANDVALVES

EXHAUSTSTACK

FILTER ELEMENT INDICATOR

BOOSTPORT

D8R FUEL SYSTEMINJECTOR

SECONDARYFILTER

PRIMINGPUMP

TRANSFERPUMP

PRIMARYFILTER

TANK

SUPPLY

RETURN

DRAINVALVESHUTOFF

VALVE

CONSTANTBLEED VALVE

FUELPUMP

D8R ADVANCED MODULAR COOLING SYSTEM

ENGINEOIL

COOLER

WATERPUMP

AIR VENT

BYPASS

SHUNTLINE

WATER PUMPOUTLET

EXPANSIONTANK

TEMPERATUREREGULATOR

AIRFLOW

AFTERCOOLER

D8R AMOCSRADIATOR

COOLANTMONITORING

D8R ENGINE LUBRICATION SYSTEM

FROMTURBOCHARGER

ENGINEOIL PAN

SUCTIONBELL

OIL PUMP

COOLERBYPASSVALVE

OIL COOLER

OIL FILTERBYPASS VALVEOIL

FILTER

TO TURBOCHARGER

CYLINDER BLOCKOIL MANIFOLD

RELIEF VALVE

TIMER/SOLENOID

FAST OILCHANGE FITTING

STARTERMOTOR

GEARPUMP

OIL FLOW TO FILTER

SUCTION LINE

FRONT OF MACHINE

PRE-LUBRICATION STARTING SYSTEMLEFT SIDE OF ENGINE

TIMER/SOLENOID

OIL PRESSURECUTOFF SWITCH

OIL FLOW TOFILTER

CHECK VALVE

FRONT OF MACHINE

PRE-LUBRICATION STARTING SYSTEMRIGHT SIDE OF ENGINE

BATTERIES

POS NEG POS NEG

FRAME ENGINE

ALTERNATORBREAKER

NEUTRAL-STARTSWITCH

STARTERRELAY

MAINRELAY

BUSBAR

307 OR

RD 00

RD 00

200 BK

BK 00RD 00

RD 00

101 RD

306 GN

308 YL

109 RD

109 RD

200 BK

200 BKSTARTERMOTOR/

PRELUBE

121 RD

POS NEG POS NEG

RD 00

DISCONNECTSWITCH

10 A

BACK-UPALARMSWITCH

321 BR

BACK-UPALARM

200 BK

304 WH

SIDE AND REAR FLOOD LAMPS/RADIO

10 A

ALT

+ R

FORWARD HORN FRONT DASH DOME

KEY START

KEY STARTSWITCH

R

CSB ST

OFFON

105 RD

10 A

10 A

112 PU

308 YL

109 RD

109 RD

101 RD105 RD

109 RD

307 OR

A447 PK

OIL PRESSURECUTOFF SWITCH

337 WH

101RD

GS

MOTOR

MTRBAT

15 A

10 A

10 A

15 A

15 A

OPERATOR MONITOR

GAUGES AND SERVICE METER

WIPER MOTORS

CIGAR LIGHTER

116 BR

116 BR

337 WH

200 BK

301 BU

PRE-LUBETIMER/

SOLENOID

D8R PRE-LUBRICATION SYSTEM

307 OR

BACK-UPALARM

ENGINE

TORQUECONVERTER

STEERINGPUMP

STEERINGMOTOR

FINAL DRIVE

D8N AND D8R TWO PUMP DIFFERENTIAL STEER SYSTEM

PILOTVALVE

D8N ONE PUMPDIFFERENTIAL STEER SYSTEM

IMPLEMENT ANDSTEERING PUMP

STEERINGVALVE

TRANSMISSIONPUMPS

IMPLEMENTPUMP

TRANSMISSIONPUMPS

IMPLEMENTCONTROLVALVES

TRANSMISSIONBRAKE AND DIFFERENTIAL

STEER MODULE

IMPLEMENTCONTROLVALVES

BRAKE AND PLANETARYDRIVE MODULE

LEFTFINAL DRIVE

RIGHT BRAKE LUBE

LEFT BRAKE LUBE

RIGHTFINAL DRIVE

TRANSMISSION CONTROL VALVE

RATIO VALVE

TRANSFER ANDBEVEL GEAR

PARKING / SERVICEBRAKE VALVE

REGULATINGRELIEF VALVE

MAKEUP ANDPRIORITY VALVE

VENT

OIL COOLER

3406C ENGINE

FLYWHEEL HOUSING

TORQUE CONVERTERCONVERTER

OUTLETRELIEF

IMPLEMENT PUMP

2 1

1 - TRANSMISSION CHARGING2 - CONVERTER CHARGING3 - SCAVENGE

3

FILTER

FILTER BYPASS

D8R POWER TRAIN

P1

P2

P3

LUBE

DIFFERENTIALSTEER PUMP

DIFFERENTIALSTEER MOTOR

SUN GEAR

ROTATINGHOUSING

IMPELLER

TURBINE

OUTLETPASSAGE

OUTPUT SHAFT

STATOR

PLANET CARRIER

PLANET GEARS

ENGINE FLYWHEEL

INLETPASSAGE

RING GEAR

TORQUE DIVIDER

POWER SHIFT TRANSMISSION

INPUT SHAFT

OUTPUT SHAFT

OUTPUTSUN GEARS

RING GEARS

INPUT SUNGEARS

PLANETARYCARRIER

RINGGEARS

1 2 3 4 5

2 13

451 2 3

R N F

FILTER

PUMP

TRANSMISSION CONTROLVALVE

COOLER

TC OUTLETRELIEFVALVE

TORQUECONVERTER

PUMPDRIVE

D8R POWER TRAIN HYDRAULIC SYSTEM

P2

P3

P1RIGHT BRAKE LUBE

LEFT BRAKE LUBE

TRANSMISSION LUBE

SERVICE BRAKESWITH SHUTTLE VALVES

TRANSMISSIONMAINSUMP

TRANSMISSIONSUMP

BRAKEVALVE

MAKEUP ANDPRIORITY VALVE

MAINSUMP

R N F

2 13

451 2 3

D8R TRANSMISSION CONTROL VALVENEUTRAL

P3

P1

P2

BLOCKEDPASSAGE

A

B

C

DIRECTIONALSPOOL

SPEEDSELECTOR

SPOOL

MODULATIONRELIEFVALVE

RATIOVALVE

LOADPISTON

PRESSUREDIFFERENTIAL

VALVE

SCREENEDORIFICE

R N F

13

451 2 3

D8R TRANSMISSION CONTROL VALVEFIRST FORWARD

P3

P1

P22

A

B

C

DIRECTIONALSPOOL

SPEEDSELECTOR

SPOOL

MODULATIONRELIEFVALVE

RATIOVALVE

LOADPISTON

PRESSUREDIFFERENTIAL

VALVE

SCREENEDORIFICE

R N F

2 13

451 2 3

D8R TRANSMISSION CONTROL VALVESTART IN GEAR

P3

P1

P2

VENT PASSAGE

A

B

C

DIRECTIONALSPOOL

SPEEDSELECTOR

SPOOL

MODULATIONRELIEFVALVE

RATIOVALVE

LOADPISTON

PRESSUREDIFFERENTIAL

VALVE

SCREENEDORIFICE

RIGHTBRAKE LUBE

LEFTBRAKE LUBE SERVICE BRAKES

WITHSHUTTLE VALVES

MAIN SUMP

BRAKE VALVE

MAKEUP ANDPRIORITY VALVE

FROM CONVERTERCHARGING PUMP

REGULATING RELIEF VALVE

CHECK VALVE

TO TORQUE CONVERTER

TO TRANSMISSIONCONTROL VALVE

FROM TRANSMISSIONCHARGING PUMP

SERVICE BRAKE PLUNGER

SERVICE BRAKE SPOOL

PARKING BRAKE SPOOL

PRIORITY VALVE

BRAKE SUPPLYPASSAGE

PRIORITY VALVE PRESSURE

BRAKE CONTROL VALVE GROUP

STEERING PINION

SPROCKETSEGMENTS

INNERPLANETARY

GEARSOUTERPLANETARY

GEARS INNERSUN

GEAR

OUTERSUN GEAR

OUTERCARRIER

RINGGEAR

INNERCARRIER

HUB DUO-CONESEALS

OUTERAXLE SHAFT

BRAKEHOUSING

HUB

BELVILLE SPRING

DISCSAND PLATES

CHAMBER

PISTON

SPOOL

RING GEAR

CARRIER

PLANET GEARS

SUN GEARS

BEVEL GEAR

RING GEAR

HOUSING

CARRIER

CENTER AXLE SHAFT

FINAL DRIVE, BRAKE GROUP, ANDSTEERING DIFFERENTIAL AND PLANETARY

TOSTEERING

PINION

BRAKE RELEASED

SHUTTLESPOOL

BRAKE ENGAGED

SHUTTLESPOOL

PISTON

BRAKE SHUTTLE SPOOL

TOSTEERING

PINION

TO RIGHTFINAL DRIVE

EQUALIZINGPLANETARY

DRIVEPLANETARY

STEERPLANETARY

TO LEFTFINAL DRIVE

HYDRAULICMOTOR INPUT

TRANSMISSIONINPUT

DIFFERENTIAL STEER COMPONENTS

TO RIGHTFINAL DRIVE

TO LEFTFINAL DRIVE

DIFFERENTIAL STEER COMPONENTSSTRAIGHT LINE OPERATION

EQUALIZINGPLANETARY

DRIVEPLANETARY

STEERPLANETARY

HYDRAULICMOTOR INPUT

TRANSMISSIONINPUT

TO RIGHTFINAL DRIVE

TO LEFTFINAL DRIVE

EQUALIZINGPLANETARY

DRIVEPLANETARY

STEERPLANETARY

HYDRAULICMOTOR INPUT TRANSMISSION

INPUT

DIFFERENTIAL STEER COMPONENTSLEFT TURN - FORWARD

STEERING COMPARISON - ONE PUMP vs TWO PUMPSFIRST SPEED FORWARD

ONE PUMP WITH IMPLEMENTS4.9 TO 6.0 M (16 TO 20 FT)*

ONE PUMP WITHOUT IMPLEMENTS1.8 TO 2.3 M (5.9 TO 7.5 FT)*

TWO PUMPS - WITH ORWITHOUT IMPLEMENTS

1.2 TO 1.8 M (3.9 TO 5.9 FT)*

* INSIDE TURNING DIAMETER

TANK

STEERING CHARGECIRCUIT FILTER

IMPLEMENTPUMP

LIFTCYLINDERSQUICK-DROP

VALVE

IMPLEMENT SYSTEM

STEERINGPUMP

STEERINGPILOTVALVE

STEERINGMOTOR

RIPPERCYLINDERS

STEERING SYSTEM

D8R STEERING AND IMPLEMENT HYDRAULIC SYSTEM

TILTCYLINDER/S

CHARGEPUMP

BYPASS ANDPRESSURECONTROL

GROUP

RIPPERDIVERTER

VALVE

INLET MANIFOLD

RIPPER

LIFT

TILT

END COVER

FROM IMPLEMENT PUMP SUPPLY

TO RIPPERDIVERTER VALVE

D8RSTEERING SYSTEM

FROM IMPLEMENTPUMP CASE

PILOT VALVE

STEERING PUMPSTEERING MOTOR

BYPASSAND

PRESSURECONTROL

GROUP

STEERING CHARGECIRCUIT FILTER

COOLER

TO CASE DRAINFILTER IN TANK

RIGHT STEERLOOP PRESSURE

LEFT STEERLOOP PRESSURE

FROM BYPASS AND PRESSURE

CONTROL GROUP

D8R STEERING PILOT VALVENO TURN

TO PUMPCONTROL

SPOOL

TO PUMPCONTROL

SPOOL

TO BYPASSAND PRESSURE

CONTROL VALVE

FROM BYPASSAND PRESSURE

CONTROL VALVE

TO STEERMOTOR(RIGHT)

TO STEERMOTOR(LEFT)

CHARGEPUMP

STEERINGPUMP

CHARGEPRESSURE

RELIEFPRESSURE

COMPENSATORVALVE

CROSSOVERRELIEF VALVE

PUMP CONTROLSPOOL

PUMPCONTROL

PISTON

D8R STEERING PUMPNO TURN PUMP CONTROL PISTON PRESSURE

RIGHT LOOPLEFT LOOPRIGHT STEER

LOOP

LEFT STEERLOOP

TO STEERINGPILOT VALVE

(LEFT)

TO STEERINGPILOT VALVE

(RIGHT)

TOBYPASS

ANDPRESSURECONTROL

GROUP

TO BYPASSAND PRESSURE

CONTROL GROUP

FROM BYPASSAND PRESSURE

CONTROL GROUP LEFT STEERLOOP PRESSURE

RIGHT STEERLOOP PRESSURE

FROMSTEERPUMP

D8R STEER MOTORNO TURN

FLUSHINGVALVE

FROMSTEERPUMP

STEERING MOTORFLUSHING VALVE

PIN

RIGHT STEERLOOP PRESSURE

LEFT STEERLOOP PRESSURE

FROM BYPASSAND PRESSURE

CONTROL GROUP

D8R STEERING PILOT VALVE

FROM PUMPCONTROL

SPOOL

LEFT TURN

TO PUMPCONTROL

SPOOL

FROM STEERINGPILOT VALVE

(LEFT)

TO BYPASSAND PRESSURECONTROL VALVE

FROM BYPASSAND PRESSURECONTROL VALVE

TO STEERMOTOR(RIGHT)

TO STEERMOTOR(LEFT)

TO STEERINGPILOT VALVE

(RIGHT)

CHARGEPUMP

STEERINGPUMP

CHARGEPRESSURE

RELIEFPRESSURE

COMPENSATORVALVE

CROSSOVERRELIEF VALVE

PUMP CONTROLSPOOL

PUMPCONTROL

PISTON

D8R STEERING PUMPLEFT TURN

PUMP CONTROL PISTON PRESSURE

RIGHT LOOPLEFT LOOP

TOBYPASS

ANDPRESSURECONTROL

GROUP

STEERING PUMPEND VIEW RIGHT CROSSOVER

RELIEF VALVE

LEFT CROSSOVERRELIEF VALVE

CHARGE PRESSURERELIEF VALVE

PRESSURECOMPENSATOR VALVE

TOP

ORIFICE PLUG

TO BYPASSAND PRESSURE

CONTROL GROUP

FROM BYPASSAND PRESSURE

CONTROL GROUP LEFT STEERLOOP PRESSURE

RIGHT STEERLOOP PRESSURE

TOSTEERPUMP

FROMSTEERPUMP

D8R STEER MOTORLEFT TURN

FLUSHINGVALVE

STEERING PUMP (TOP VIEW)

PUMP CONTROLPISTON

RETAINER

SPOOLCONTROL

ARMTO PILOT VALVE

PUMP CONTROLSPOOL

STOP

COMPRESSIONSPRING

FEEDBACKLEVER

ROD

SPRING COLLAR

LEFT SIDE

RIGHT SIDE

RIGHTLEVERARM

LEFTLEVERARM

PIVOT POINT

FROMPILOT VALVE

LEFT TURN

STEERING PUMPSIDE VIEW

PUMP CONTROL VALVEPUMPCONTROL

PISTON

RIGHT CROSSOVERRELIEF VALVE

LEFTCROSSOVER

RELIEF VALVE

CHARGEPUMP

FEEDBACK LEVER

SWASHPLATE PISTONS

FROM STEER MOTOR

CASE DRAIN

TO STEER MOTORCASE DRAIN

CHARGEPUMP

DISCHARGEPRESSURE

CHARGEPUMP RELIEF

PRESSURE

CASE RETURNPRESSURE

FROM IMPLEMENT PUMP SUPPLY

TOFILTER

FROMCHARGE PUMP

FROMCOOLER

TO CHARGEPRESSURE RELIEF

VALVE

FROMFILTER

FROMSTEER PUMPCASE DRAIN

FROMIMPLEMENT PUMP

CASE DRAIN

TO COOLER, PILOT, ANDRIPPER DIVERTER VALVE

COLD OILBYPASS

COOLERBYPASS

CHARGECIRCUITMAKEUPVALVE

BYPASS AND PRESSURE CONTROL GROUP

COOLING ORIFICE

TO CASE DRAINFILTER IN TANK

TANK

STEERING CHARGECIRCUIT FILTER

IMPLEMENTPUMP

LIFTCYLINDERSQUICK-DROP

VALVE

IMPLEMENT SYSTEM

STEERINGPUMP

STEERINGPILOTVALVE

STEERINGMOTOR

RIPPERCYLINDERS

STEERING SYSTEM

D8R STEERING AND IMPLEMENT HYDRAULIC SYSTEM

TILTCYLINDER

CHARGEPUMP

BYPASS ANDPRESSURECONTROL

GROUP

RIPPERDIVERTER

VALVE

INLET MANIFOLD

RIPPER

LIFT

TILT

END COVER

PUMPDIVERTER

STEERINGCHARGE PRESSURE

BYPASS AND PRESSURECONTROL GROUP

QUICK-DROP

INLETMANIFOLD

RIPPER

LIFT

TILT

ENDCOVER

D8R IMPLEMENT HYDRAULIC SYSTEM

TO BYPASSAND PRESSURE

CONTROL VALVE

TO BYPASSAND PRESSURE

CONTROL VALVE

STEERINGCHARGE

PRESSURE

X

D8R IMPLEMENT HYDRAULIC SYSTEM

IMPLEMENT PUMP

QUICK-DROPVALVE

TANK

TILT

LIFT

RIPPER

INLETMANIFOLD

RIPPERDIVERTER

TO STEERINGCHARGE PUMP

TO TANK

TOACTUATOR PISTON

FROMOUTPUT PORT

PRESSURE COMPENSATOR(CUTOFF) SPRING

FLOW COMPENSATOR(MARGIN) SPRING

PRESSURE COMPENSATOR(CUTOFF) SPOOL

FLOW COMPENSATOR(MARGIN) SPOOL

ADJUSTMENT SCREWS

PRESSURE AND FLOW COMPENSATOR VALVE

PUMP OUTPUT

LARGE ACTUATOR

SMALL ACTUATORAND BIAS SPRING

SWASHPLATE

DRIVESHAFT

YOKE PAD

PRESSURECOMPENSATOR

(CUTOFF) SPOOL

FLOW COMPENSATOR( MARGIN) SPOOL

NO SIGNAL

PISTON ANDBARREL ASSEMBLY

PUMP AND COMPENSATOR OPERATIONENGINE OFF

PUMP OUTPUTNO SIGNAL

PUMP AND COMPENSATOR OPERATIONLOW PRESSURE STANDBY

PUMP OUTPUTSIGNAL

REDUCED PRESSURE

PUMP AND COMPENSATOR OPERATIONUPSTROKING

REDUCED PRESSURE

PUMP AND COMPENSATOR OPERATIONCONSTANT FLOW

PUMP OUTPUTSIGNAL

INCREASED PRESSURE

PUMP AND COMPENSATOR OPERATIONDESTROKING

PUMP OUTPUTSIGNAL

PUMP OUTPUTAT MAX.

PRESSURE

SIGNAL ATMAX. PRESSURE

PUMP AND COMPENSATOR OPERATIONHIGH PRESSURE STALL

D8R IMPLEMENT VALVESTO BYPASS AND

PRESSURE CONTROL GROUP

IMPLEMENT PUMPPRESSURE

IMPLEMENTPUMP SIGNAL

PRESSURE SIGNAL LINE TOIMPLEMENT PUMP

TOIMPLEMENT

PUMP SUPPLY

SYSTEMRELIEFVALVE

CHARGERELIEFVALVE

FLOWCONTROL

VALVE

FLOWCONTROL

VALVE

FLOWCONTROL

VALVE

TO RIPPERLIFT CYLINDERS

TO LIFTCYLINDERS

TO TILTCYLINDERS

.

RIPPER

LIFT

TILT

INLET MANIFOLD

ROD END HEAD END RETURNTO TANK

LOAD CHECKVALVE

PLUG

DOZER LIFT VALVEHOLD

TOCOMPENSATOR

VALVE

MAIN CONTROLSPOOL

RESOLVER

MAKEUPVALVE

FLOW CONTROL SPOOLFROM PUMP

FROMPREVIOUS

VALVE

ROD END HEAD ENDRETURNTO TANK

LOAD CHECKVALVE

PLUG

DOZER LIFT VALVERAISE

TOCOMPENSATOR

VALVE

MAIN CONTROLSPOOL

RESOLVER

MAKEUPVALVE

FLOW CONTROL SPOOLFROM PUMP

FROMPREVIOUS

VALVE

ROD END HEAD ENDRETURNTO TANK

LOAD CHECKVALVE

FLOW CONTROL SPOOL

PLUG

DOZER LIFT VALVELOWER

TOCOMPENSATOR

VALVE

MAIN CONTROLSPOOL

RESOLVER

MAKEUPVALVE

FROM PUMP

FROMPREVIOUS

VALVE

ROD END HEAD ENDRETURNTO TANK

LOAD CHECKVALVE

PLUG

DOZER TILT VALVETILT LEFT

MAIN CONTROLSPOOL

RESOLVER

PLUG

FLOW CONTROL SPOOLFROM PUMP

TOCOMPENSATOR

VALVE

ROD END HEAD ENDRETURNTO TANK

LOAD CHECKVALVE

PLUG

RIPPER CONTROL VALVEHOLD

TOCOMPENSATOR

VALVE

MAIN CONTROLSPOOL

RESOLVER

MAKEUPVALVE

FLOW CONTROL SPOOLFROM PUMP

FROMPREVIOUS

VALVE

D8R QUICK-DROP VALVE

QUICK-DROP VALVE

DOZER TILT

DOZER LIFT

TOIMPLEMENT

VALVE

TOIMPLEMENT

VALVE

TOIMPLEMENT

VALVE

D8R QUICK-DROP VALVE

TO ROD END

TO HEAD END

COVER

PLUNGER

PASSAGE TOSPOOL END

VALVE SPOOL

ORIFICE SLEEVE

TO RIGHT CYLINDERROD END

TO RIGHT CYLINDERHEAD END

TO LEFT CYLINDERROD END

TO LEFT CYLINDERHEAD END

TO/FROM LIFT CONTROL VALVE

PASSAGE TOPLUNGER END

QUICK-DROP VALVEHOLD

COVER

COVER

PLUNGER

PASSAGE TOSPOOL END

VALVE SPOOL

ORIFICE SLEEVE

TO RIGHT CYLINDERROD END

TO RIGHT CYLINDERHEAD END

TO LEFT CYLINDERROD END

TO LEFT CYLINDERHEAD END

TO/FROM LIFT CONTROL VALVE

QUICK-DROP VALVEDOZER RAISE

PASSAGE TOPLUNGER END

COVER

COVER

PLUNGER

PASSAGE TOSPOOL END

VALVE SPOOL

ORIFICE SLEEVE

FROM RIGHT CYLINDERROD END

TO RIGHT CYLINDERHEAD END

FROM LEFT CYLINDERROD END

TO LEFT CYLINDERHEAD END

TO/FROM LIFT CONTROL VALVE

QUICK-DROP VALVEDOZER LOWER

PASSAGE TOPLUNGER END

COVER

COVER

PLUNGER

PASSAGE TOSPOOL END

VALVE SPOOL

ORIFICE SLEEVE

FROM RIGHT CYLINDERROD END

TO RIGHT CYLINDERHEAD END

FROM LEFT CYLINDERROD END

TO LEFT CYLINDERHEAD END

TO/FROM LIFT CONTROL VALVE

QUICK-DROP VALVEQUICK-DROP

PASSAGE TOPLUNGER END

COVER

COVER

PLUNGER

PASSAGE TOSPOOL END

VALVE SPOOL

ORIFICE SLEEVE

FROM RIGHT CYLINDERROD END

TO RIGHT CYLINDERHEAD END

FROM LEFT CYLINDERROD END

TO LEFT CYLINDERHEAD END

TO/FROM LIFT CONTROL VALVE

QUICK-DROP VALVEDOZER LOWER

WITH DOWN PRESSURE

PASSAGE TOPLUNGER END

COVER

RIPPER TIP

RIPPER LIFT

FROM RIPPERCONTROL

VALVE

STEERINGCHARGE PRESSURE

D8R RIPPER DIVERTER VALVE

STEERINGCHARGE

PRESSUREPORT

RIPPER TIP IN( PORT E)

RIPPER TIP OUT(PORT F)

RIPPER LOWER(PORT C)

RIPPER RAISE(PORT D)

CHARGE PRESSURETEST PORT

C E D F

RIPPER SUPPLYLOWER/TIP IN

RIPPER SUPPLYRAISE/TIP OUT

RIPPER DIVERTER VALVE

BATTERIES

POS NEG POS NEG

FRAME ENGINEALTERNATOR

BREAKER

NEUTRAL-STARTSWITCH

STARTERRELAY

MAINRELAY BUS BAR

307 OR

RD 00

RD 00

200 BK

BK 00RD 00

RD 00

101 RD

306 GN

308 YL

109 RD

109 RD

200 BK

200 BK

STARTERMOTOR

121 RD

POS NEG POS NEG

RD 00

DISCONNECTSWITCH

10 A

BACK-UPALARM

BACK-UP ALARMSWITCH

321 BR

BACK-UP ALARM

200 BK

304 WH

15 A

10 A

10 A

15 A

15 A

SIDE AND REAR FLOOD LAMPS/RADIO

OPERATOR MONITOR

GAUGES AND SERVICE METER

WIPER MOTORS

CIGAR LIGHTER

10 A

ALT

+ R

FORWARD HORN FRONT DASH DOME

KEY START

KEY STARTSWITCH

R

CSB ST

OFFON

105 RD

10 A

10 A

GS

MOTOR

MTRBAT

112 PU

308 YL

109 RD

109 RD

101 RD105 RD

109 RD

D8R STARTING AND CHARGING SYSTEM

COOLANTTEMPERATURE

COOLANTFLOW

ENGINEOIL PRESSURE

HYDRAULICOIL TEMPERATURE

POWER TRAINOIL TEMPERATURE

POWER TRAINOIL FILTER

ALTERNATOR

HYDRAULICOIL FILTER

D8R EMS PANEL

CONDENSERCOIL

COMPRESSOR

EVAPORATORCOIL

ORIFICE TUBE/DRYER

ACCUMULATOR

EVAPORATOR BLOWER FAN

D8R ORIFICE TUBE SYSTEM

CONDENSER FAN

ORIFICE TUBE

SCREEN SCREENBODY

TUBE O-RINGS TABS

DRIVE PLATE

HUB

PULLEY ASSEMBLY

BEARINGCOIL ASSEMBLY

SHAFT

COMPRESSORCLUTCH

OIL BLEED LINE

VAPOR LINE

OUTLET

DIVERTER CAPINLET

ACCUMULATOR

BATTERY

CLUTCH

POINTOPENING

CAPILLARY TUBE

CAPILLARY BELLOWSASSEMBLYPIVOTING FRAME

TEMPERATUREADJUSTING SCREW

R-134a

THERMOSTATICSWITCH

COMPRESSORELECTRICAL CIRCUIT

BATTERIES

POS NEG POS NEG

FRAME ENGINEALTERNATOR

BREAKER

NEUTRAL-STARTSWITCH

STARTERRELAY

MAINRELAY

BUS BAR

307 OR

RD 00

RD 00

200 BK

BK 00RD 00

RD 00

101 RD

306 GN

308 YL

109 RD

200 BK

200 BK

STARTERMOTOR

D8R OPERATOR'S STATION AIR CONDITIONING SYSTEM

POS NEG POS NEG

RD 00

DISCONNECTSWITCH

304 WH

ALT

+ R

KEY START

KEY START SWITCH

R

CSB ST

OFFON

10 AGS

MOTOR

MTRBAT

112 PU

308 YL

109 RD

101 RD105 RD

109 RD

124 GNBLOWERMOTOR

BREAKER

BLOWER MOTORSWITCH

BLOWERMOTOR

BLOWERMOTOR

1 2 5 4 3

RESISTOR

517 BU

516 GN

515 GY515 GY

20 AT°

THERMOSTATSWITCHARC SUPPRESSOR

AIR CONDITIONER CLUTCH

REFRIGERANT SWITCH(NORMALLY OPEN BEFORE

REFRIGERANT CHARGE)

521 YL

513 OR 522 WH

BATTERIES

POS NEG POS NEG

FRAME ENGINEALTERNATOR

BREAKER

NEUTRAL-STARTSWITCH

STARTERRELAY

MAINRELAY

BUS BAR

307 OR

RD 00

RD 00

200 BK

BK 00RD 00

RD 00

101 RD

306 GN

308 YL

109 RD

200 BK

200 BK

STARTERMOTOR

D8R OPERATOR'S STATION HEATING SYSTEM

POS NEG POS NEG

RD 00

DISCONNECTSWITCH

304 WH

ALT

+ R

KEY START

KEY STARTSWITCH

R

CSB ST

OFFON

10 AGS

MOTOR

MTRBAT

112 PU

308 YL

109 RD

101 RD105 RD

109 RD

124 GN

BLOWERMOTOR

BREAKER

BLOWER MOTORSWITCH

BLOWERMOTOR

BLOWERMOTOR

1 2 5 4 3

RESISTOR

517 BU

516 GN

515 GY515 GY

20 A