Manual Completo d8r

D 8 R T R A C K - T Y P E T R A C TO R S

© 1998 Caterpillar Inc.

STEER SYSTEM COMPARISON D8N One Pump

D8N/D8R Two Pump

• Piston-type pump for steering and hydraulics

• Piston-type pump for steering only

• Steering control valve integrated with implement control valve

• Steering controlled by remote pilot valve

• Counterbalance valve to prevent overspeeding

• Crossover and makeup valves replace counterbalance valve

• Steering motor without internal flushing valve

• Steering motor with internal flushing valve

• Tiller control with separate speed selector and parking brake

• Dual twist tiller with integrated speed selector and parking brake

HYDRAULIC SYSTEM COMPARISON D8N One Pump

D8N/D8R Two Pump

• Piston-type pump for steering and implements

• Piston-type pump for implements only

• Load sensing, pressure compensated hydraulics with steering priority

• Load sensing, pressure compensated hydraulics

• Standard Caterpillar cylinders

• Threaded gland lift and pin puller cylinders

• Individual quick-drop valve for each lift cylinder

• Single quick-drop valve similar to the D6R/D7R

• Individual ripper function valves

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

ADDITIONAL CHANGES D8N One Pump • Folded core radiator • Two section transmission pump

• 3406B DIT 212.5 kW (285 hp) • Torque rise @ 34% • Two low maintenance, high output batteries • Fuel level dipstick • Mechanical hourmeter

D8N Two Pump

D8R Two Pump

• Improved Multiple Row Module (IMRM) radiator • Three section transmission pump (added torque converter charging section) • Improved operator's station • 3406C DITA 212.5 kW (285 hp) • Torque rise @ 25%

• Advanced Modular Cooling System (AMOCS) • No Change

• Four heavy-duty, maintenance free batteries • Fuel level gauge on dash • Electronic LCD hourmeter

• No Change

• Four ecology drains

• No Change • 3406C DITA 228 kW (305 hp) • Torque rise @ 25% and emissions certified

• No Change • No Change • Seven ecology drains

OPTIONAL EQUIPMENT • Air Conditioning (R-134a) • Fast fill fuel system • Fast oil change system for engine and transmission • Dual tilt cylinders on 8A angle dozer with tilt blade • 58 Winch • Engine pre-lubrication system

EXHAUST STACK

D8R AIR INLET AND EXHAUST SYSTEM

MUFFLER

BOOST PORT

EXHAUST MANIFOLD

DUST EJECTOR LINE

AFTERCOOLER PRECLEANER

HEAD AND VALVES CYLINDER

AIR CLEANER FILTER ELEMENT INDICATOR

TURBOCHARGER TURBINE WHEEL COMPRESSOR WHEEL

INJECTOR

D8R FUEL SYSTEM CONSTANT BLEED VALVE TANK FUEL PUMP

RETURN

SHUTOFF VALVE

DRAIN VALVE PRIMING PUMP

TRANSFER PUMP

SUPPLY SECONDARY FILTER PRIMARY FILTER

D8R ADVANCED MODULAR COOLING SYSTEM EXPANSION TANK AFTERCOOLER

TEMPERATURE REGULATOR AIR VENT

BYPASS

SHUNT LINE

AIR FLOW

ENGINE OIL COOLER

WATER PUMP

WATER PUMP OUTLET

D8R AMOCS RADIATOR

COOLANT MONITORING

D8R ENGINE LUBRICATION SYSTEM CYLINDER BLOCK OIL MANIFOLD FROM TURBOCHARGER

TO TURBOCHARGER OIL FILTER

OIL PUMP

COOLER BYPASS VALVE

ENGINE OIL PAN SUCTION BELL

OIL COOLER RELIEF VALVE

OIL FILTER BYPASS VALVE

PRE-LUBRICATION STARTING SYSTEM LEFT SIDE OF ENGINE

TIMER/SOLENOID FAST OIL CHANGE FITTING

FRONT OF MACHINE

OIL FLOW TO FILTER SUCTION LINE

GEAR PUMP

STARTER MOTOR

PRE-LUBRICATION STARTING SYSTEM RIGHT SIDE OF ENGINE

TIMER/SOLENOID OIL PRESSURE CUTOFF SWITCH

CHECK VALVE OIL FLOW TO FILTER FRONT OF MACHINE

D8R PRE-LUBRICATION SYSTEM

KEY START SWITCH

PRE-LUBE TIMER/ SOLENOID

200 BK BACK-UP

R

308 YL

321 BR C OFF S ON B ST

BACK-UP ALARM 109 RD 10 A

307 OR

307 OR

121 RD

KEY START 101 RD 10 A

105 RD

ALARM SWITCH

337 WH 116 BR

BACK-UP ALARM

A447 PK 200 BK

304 WH

STARTER RELAY

301 BU

307 OR

306 GN

101 RD

109 RD

ALTERNATOR BREAKER

112 PU 109 RD

308 YL

10 A FORWARD HORN

200 BK 109 RD +

15 A R

BUS BAR

10 A FRONT DASH DOME

SIDE AND REAR FLOOD LAMPS/RADIO

FRAME

OPERATOR MONITOR

10 A

GAUGES AND SERVICE METER

15 A

WIPER MOTORS

15 A

CIGAR LIGHTER

ENGINE RD 00

RD 00

POS NEG

POS NEG

116 BR RD 00

10 A

101RD

200 BK

105 RD

109 RD

ALT

STARTER MOTOR/ PRELUBE

MOTOR

NEUTRAL-START SWITCH

MAIN RELAY

OIL PRESSURE CUTOFF SWITCH

BAT MTR

RD 00 200 BK

G

S

337 WH

RD 00

POS NEG

POS NEG

BATTERIES

BK 00

DISCONNECT SWITCH

D8N ONE PUMP DIFFERENTIAL STEER SYSTEM

D8N AND D8R TWO PUMP DIFFERENTIAL STEER SYSTEM ENGINE TORQUE CONVERTER IMPLEMENT CONTROL VALVES

IMPLEMENT AND STEERING PUMP

STEERING PUMP PILOT VALVE

IMPLEMENT PUMP TRANSMISSION PUMPS

TRANSMISSION PUMPS STEERING VALVE

STEERING MOTOR

IMPLEMENT CONTROL VALVES

FINAL DRIVE BRAKE AND DIFFERENTIAL STEER MODULE

BRAKE AND PLANETARY DRIVE MODULE TRANSMISSION

LEFT FINAL DRIVE

LEFT BRAKE LUBE

D8R POWER TRAIN

REGULATING MAKEUP AND RELIEF VALVE PRIORITY VALVE

DIFFERENTIAL STEER MOTOR DIFFERENTIAL STEER PUMP

FLYWHEEL HOUSING TORQUE CONVERTER

CONVERTER OUTLET VENT RELIEF

TRANSMISSION CONTROL VALVE P2 P1

3406C ENGINE

P3 LUBE 3

2

1

OIL COOLER

RATIO VALVE TRANSFER AND BEVEL GEAR PARKING / SERVICE BRAKE VALVE FILTER

RIGHT BRAKE LUBE RIGHT FINAL DRIVE FILTER BYPASS

IMPLEMENT PUMP 1 - TRANSMISSION CHARGING 2 - CONVERTER CHARGING 3 - SCAVENGE

TORQUE DIVIDER ENGINE FLYWHEEL

PLANET GEARS

ROTATING HOUSING OUTLET PASSAGE

SUN GEAR

OUTPUT SHAFT STATOR

PLANET CARRIER RING GEAR

INLET PASSAGE

TURBINE IMPELLER

POWER SHIFT TRANSMISSION RING GEARS

RING GEARS

INPUT SUN GEARS

INPUT SHAFT

OUTPUT SHAFT PLANETARY CARRIER

OUTPUT SUN GEARS

1

2

3

4

5

D8R POWER TRAIN HYDRAULIC SYSTEM TORQUE CONVERTER TRANSMISSION CONTROL VALVE

5

TC OUTLET RELIEF VALVE

PUMP DRIVE

4

COOLER

1 2 3

SERVICE BRAKES WITH SHUTTLE VALVES P3

LEFT BRAKE LUBE

R N F

P1

3

2

1

P2

RIGHT BRAKE LUBE BRAKE VALVE

TRANSMISSION LUBE MAIN SUMP

TRANSMISSION

TRANSMISSION SUMP

PUMP

FILTER

MAIN SUMP

MAKEUP AND PRIORITY VALVE

D8R TRANSMISSION CONTROL VALVE NEUTRAL MODULATION RELIEF VALVE

SPEED SELECTOR SPOOL

5

4

1 2 3

LOAD PISTON C

RATIO VALVE

SCREENED ORIFICE

PRESSURE DIFFERENTIAL VALVE

B

P3

DIRECTIONAL SPOOL

BLOCKED PASSAGE R N F

A

P1

3

2

1

P2

D8R TRANSMISSION CONTROL VALVE FIRST FORWARD SPEED SELECTOR SPOOL

MODULATION RELIEF VALVE

5

4

1 2 3

LOAD PISTON SCREENED ORIFICE

C

RATIO VALVE

PRESSURE DIFFERENTIAL VALVE

B

P3

DIRECTIONAL SPOOL

R N

A

F

P1

3

2

1

P2

D8R TRANSMISSION CONTROL VALVE START IN GEAR MODULATION RELIEF VALVE

SPEED SELECTOR SPOOL

5

4

1 2 3

LOAD PISTON SCREENED ORIFICE

C

RATIO VALVE

PRESSURE DIFFERENTIAL VALVE

B

P3

DIRECTIONAL SPOOL

R N F

A

P1

2

3 VENT PASSAGE

1

P2

BRAKE CONTROL VALVE GROUP PARKING BRAKE SPOOL

BRAKE SUPPLY PASSAGE

LEFT BRAKE LUBE RIGHT BRAKE LUBE

FROM CONVERTER CHARGING PUMP

SERVICE BRAKES WITH SHUTTLE VALVES

MAIN SUMP SERVICE BRAKE SPOOL

REGULATING RELIEF VALVE CHECK VALVE

BRAKE VALVE SERVICE BRAKE PLUNGER PRIORITY VALVE PRESSURE

TO TORQUE CONVERTER TO TRANSMISSION CONTROL VALVE

FROM TRANSMISSION CHARGING PUMP

PRIORITY VALVE

MAKEUP AND PRIORITY VALVE

FINAL DRIVE, BRAKE GROUP, AND STEERING DIFFERENTIAL AND PLANETARY SPROCKET SEGMENTS INNER PLANETARY GEARS

OUTER PLANETARY GEARS

INNER SUN GEAR

BRAKE HOUSING

DISCS AND PLATES

SPOOL

HOUSING

STEERING PINION

HUB

RING GEAR CARRIER PLANET GEARS OUTER AXLE SHAFT

CENTER AXLE SHAFT

SUN GEARS OUTER SUN GEAR OUTER CARRIER RING GEAR CARRIER BEVEL GEAR HUB DUO-CONE SEALS

RING GEAR

INNER CARRIER

CHAMBER PISTON

BELVILLE SPRING

BRAKE SHUTTLE SPOOL SHUTTLE SPOOL

TO STEERING PINION

SHUTTLE SPOOL

PISTON

BRAKE ENGAGED

BRAKE RELEASED

TO STEERING PINION

DIFFERENTIAL STEER COMPONENTS HYDRAULIC MOTOR INPUT

TRANSMISSION INPUT

TO LEFT FINAL DRIVE

TO RIGHT FINAL DRIVE

STEER DRIVE PLANETARY PLANETARY

EQUALIZING PLANETARY

DIFFERENTIAL STEER COMPONENTS STRAIGHT LINE OPERATION HYDRAULIC MOTOR INPUT

TRANSMISSION INPUT

TO LEFT FINAL DRIVE

TO RIGHT FINAL DRIVE

STEER PLANETARY

DRIVE PLANETARY

EQUALIZING PLANETARY

DIFFERENTIAL STEER COMPONENTS LEFT TURN - FORWARD HYDRAULIC MOTOR INPUT

TRANSMISSION INPUT

TO RIGHT FINAL DRIVE

TO LEFT FINAL DRIVE

STEER PLANETARY

DRIVE PLANETARY

EQUALIZING PLANETARY

STEERING COMPARISON - ONE PUMP vs TWO PUMPS FIRST SPEED FORWARD ONE PUMP WITH IMPLEMENTS 4.9 TO 6.0 M (16 TO 20 FT)*

ONE PUMP WITHOUT IMPLEMENTS 1.8 TO 2.3 M (5.9 TO 7.5 FT)* TWO PUMPS - WITH OR WITHOUT IMPLEMENTS 1.2 TO 1.8 M (3.9 TO 5.9 FT)* * INSIDE TURNING DIAMETER

D8R STEERING AND IMPLEMENT HYDRAULIC SYSTEM

STEERING MOTOR

STEERING SYSTEM

STEERING PUMP CHARGE PUMP

STEERING PILOT VALVE

BYPASS AND PRESSURE CONTROL GROUP

RIPPER CYLINDERS

STEERING CHARGE CIRCUIT FILTER

RIPPER DIVERTER VALVE TANK

IMPLEMENT SYSTEM IMPLEMENT PUMP INLET MANIFOLD RIPPER QUICK-DROP VALVE

LIFT TILT END COVER

TILT CYLINDER/S

LIFT CYLINDERS

STEERING MOTOR

STEERING PUMP

PILOT VALVE

BYPASS AND PRESSURE CONTROL GROUP

COOLER

TO RIPPER DIVERTER VALVE

TO CASE DRAIN FILTER IN TANK FROM IMPLEMENT PUMP CASE FROM IMPLEMENT PUMP SUPPLY

STEERING CHARGE CIRCUIT FILTER

D8R STEERING SYSTEM

D8R STEERING PILOT VALVE NO TURN

LEFT STEER LOOP PRESSURE

RIGHT STEER LOOP PRESSURE

TO PUMP CONTROL SPOOL

FROM BYPASS AND PRESSURE CONTROL GROUP

TO PUMP CONTROL SPOOL

D8R STEERING PUMP NO TURN

RIGHT STEER LOOP

PUMP CONTROL PISTON PRESSURE RIGHT LOOP LEFT LOOP

TO STEER MOTOR (RIGHT)

CHARGE PUMP

CHARGE PRESSURE PRESSURE COMPENSATOR RELIEF VALVE CROSSOVER RELIEF VALVE

STEERING PUMP PUMP CONTROL PISTON

TO BYPASS AND PRESSURE CONTROL GROUP

TO STEER MOTOR (LEFT)

LEFT STEER LOOP FROM BYPASS AND PRESSURE CONTROL VALVE TO BYPASS AND PRESSURE CONTROL VALVE

PUMP CONTROL SPOOL

TO STEERING PILOT VALVE (RIGHT)

TO STEERING PILOT VALVE (LEFT)

D8R STEER MOTOR NO TURN FROM STEER PUMP

RIGHT STEER LOOP PRESSURE

FLUSHING VALVE

TO BYPASS AND PRESSURE CONTROL GROUP

FROM BYPASS AND PRESSURE CONTROL GROUP

FROM STEER PUMP LEFT STEER LOOP PRESSURE

STEERING MOTOR FLUSHING VALVE

PIN

D8R STEERING PILOT VALVE LEFT TURN

LEFT STEER LOOP PRESSURE

RIGHT STEER LOOP PRESSURE

FROM PUMP CONTROL SPOOL

FROM BYPASS AND PRESSURE CONTROL GROUP

TO PUMP CONTROL SPOOL

D8R STEERING PUMP LEFT TURN PUMP CONTROL PISTON PRESSURE LEFT LOOP

TO STEER MOTOR (RIGHT)

CHARGE PUMP

RIGHT LOOP

CHARGE PRESSURE PRESSURE COMPENSATOR RELIEF VALVE CROSSOVER RELIEF VALVE

STEERING PUMP PUMP CONTROL PISTON

TO BYPASS AND PRESSURE CONTROL GROUP

TO STEER MOTOR (LEFT)

FROM BYPASS AND PRESSURE CONTROL VALVE TO BYPASS AND PRESSURE CONTROL VALVE

PUMP CONTROL SPOOL

TO STEERING PILOT VALVE (RIGHT)

FROM STEERING PILOT VALVE (LEFT)

STEERING PUMP END VIEW TOP

RIGHT CROSSOVER RELIEF VALVE CHARGE PRESSURE RELIEF VALVE

ORIFICE PLUG

PRESSURE COMPENSATOR VALVE

LEFT CROSSOVER RELIEF VALVE

D8R STEER MOTOR LEFT TURN TO STEER PUMP

RIGHT STEER LOOP PRESSURE

FLUSHING VALVE

TO BYPASS AND PRESSURE CONTROL GROUP

FROM STEER PUMP FROM BYPASS AND PRESSURE CONTROL GROUP

LEFT STEER LOOP PRESSURE

STEERING PUMP (TOP VIEW) LEFT TURN SPRING COLLAR

RETAINER

FROM PILOT VALVE RIGHT SIDE PUMP CONTROL SPOOL

ROD

RIGHT LEVER ARM STOP

COMPRESSION SPRING

LEFT LEVER ARM

PUMP CONTROL PISTON

FEEDBACK LEVER

LEFT SIDE TO PILOT VALVE PIVOT POINT

SPOOL CONTROL ARM

PUMP CONTROL PISTON

FEEDBACK LEVER

PUMP CONTROL VALVE

RIGHT CROSSOVER RELIEF VALVE

STEERING PUMP SIDE VIEW

CHARGE PUMP

SWASHPLATE

PISTONS

LEFT CROSSOVER RELIEF VALVE

BYPASS AND PRESSURE CONTROL GROUP TO COOLER, PILOT, AND RIPPER DIVERTER VALVE

TO STEER MOTOR CASE DRAIN

FROM STEER PUMP CHARGE FROM PUMP CASE DRAIN DISCHARGE CHARGE PUMP PRESSURE

FROM CHARGE PUMP RELIEF COOLER PRESSURE

CASE RETURN PRESSURE COLD OIL BYPASS

COOLING ORIFICE FROM STEER MOTOR CASE DRAIN

CHARGE CIRCUIT MAKEUP VALVE

COOLER BYPASS

TO CASE DRAIN FILTER IN TANK TO FILTER FROM IMPLEMENT PUMP CASE DRAIN

FROM IMPLEMENT PUMP SUPPLY

FROM FILTER

TO CHARGE PRESSURE RELIEF VALVE

D8R STEERING AND IMPLEMENT HYDRAULIC SYSTEM

STEERING MOTOR

STEERING SYSTEM

STEERING PUMP CHARGE PUMP

STEERING PILOT VALVE

BYPASS AND PRESSURE CONTROL GROUP

RIPPER CYLINDERS

RIPPER DIVERTER VALVE

STEERING CHARGE CIRCUIT FILTER

TANK

IMPLEMENT SYSTEM IMPLEMENT PUMP INLET MANIFOLD RIPPER QUICK-DROP VALVE

LIFT TILT END COVER

TILT CYLINDER

LIFT CYLINDERS

D8R IMPLEMENT HYDRAULIC SYSTEM BYPASS AND PRESSURE CONTROL GROUP

STEERING CHARGE PRESSURE

INLET MANIFOLD DIVERTER

RIPPER LIFT TILT END COVER

QUICK-DROP

PUMP

STEERING CHARGE PRESSURE

D8R IMPLEMENT HYDRAULIC SYSTEM TO BYPASS AND PRESSURE CONTROL VALVE

RIPPER DIVERTER TO BYPASS AND PRESSURE CONTROL VALVE

TO STEERING CHARGE PUMP

X

INLET MANIFOLD

IMPLEMENT PUMP

QUICK-DROP VALVE RIPPER

LIFT

TILT

TANK

PRESSURE AND FLOW COMPENSATOR VALVE ADJUSTMENT SCREWS

PRESSURE COMPENSATOR (CUTOFF) SPRING

FLOW COMPENSATOR (MARGIN) SPRING

TO TANK

TO ACTUATOR PISTON FLOW COMPENSATOR (MARGIN) SPOOL

FROM OUTPUT PORT PRESSURE COMPENSATOR (CUTOFF) SPOOL

PUMP AND COMPENSATOR OPERATION ENGINE OFF

NO SIGNAL

PUMP OUTPUT LARGE ACTUATOR

YOKE PAD SWASHPLATE

DRIVE SHAFT

FLOW COMPENSATOR ( MARGIN) SPOOL

PRESSURE COMPENSATOR (CUTOFF) SPOOL

SMALL ACTUATOR AND BIAS SPRING PISTON AND BARREL ASSEMBLY

PUMP AND COMPENSATOR OPERATION LOW PRESSURE STANDBY NO SIGNAL

PUMP OUTPUT

PUMP AND COMPENSATOR OPERATION UPSTROKING SIGNAL

PUMP OUTPUT REDUCED PRESSURE

PUMP AND COMPENSATOR OPERATION CONSTANT FLOW SIGNAL

PUMP OUTPUT REDUCED PRESSURE

PUMP AND COMPENSATOR OPERATION DESTROKING SIGNAL

PUMP OUTPUT

INCREASED PRESSURE

PUMP AND COMPENSATOR OPERATION HIGH PRESSURE STALL SIGNAL AT MAX. PRESSURE

PUMP OUTPUT AT MAX. PRESSURE

D8R IMPLEMENT VALVES TO BYPASS AND PRESSURE CONTROL GROUP

IMPLEMENT PUMP PRESSURE

IMPLEMENT PUMP SIGNAL PRESSURE

SIGNAL LINE TO IMPLEMENT PUMP

INLET MANIFOLD

CHARGE RELIEF VALVE

SYSTEM RELIEF VALVE

TO IMPLEMENT PUMP SUPPLY

. FLOW CONTROL VALVE RIPPER TO RIPPER LIFT CYLINDERS FLOW CONTROL VALVE LIFT TO LIFT CYLINDERS FLOW CONTROL VALVE TILT

TO TILT CYLINDERS

DOZER LIFT VALVE HOLD PLUG

ROD END

HEAD END

RETURN TO TANK

FROM PREVIOUS VALVE

MAKEUP VALVE

MAIN CONTROL SPOOL

RESOLVER

LOAD CHECK VALVE FROM PUMP

FLOW CONTROL SPOOL

TO COMPENSATOR VALVE

DOZER LIFT VALVE RAISE ROD END

HEAD END

RETURN TO TANK

FROM PREVIOUS VALVE

MAKEUP VALVE

PLUG

MAIN CONTROL SPOOL

RESOLVER

LOAD CHECK VALVE FROM PUMP

FLOW CONTROL SPOOL

TO COMPENSATOR VALVE

DOZER LIFT VALVE LOWER ROD END

HEAD END

RETURN TO TANK

FROM PREVIOUS VALVE

MAKEUP VALVE

PLUG

MAIN CONTROL SPOOL

RESOLVER

LOAD CHECK VALVE FROM PUMP

FLOW CONTROL SPOOL

TO COMPENSATOR VALVE

DOZER TILT VALVE TILT LEFT ROD END

PLUG

HEAD END

RETURN TO TANK

PLUG

MAIN CONTROL SPOOL

RESOLVER

LOAD CHECK VALVE FROM PUMP

FLOW CONTROL SPOOL

TO COMPENSATOR VALVE

RIPPER CONTROL VALVE HOLD ROD END

HEAD END

RETURN TO TANK

FROM PREVIOUS VALVE

MAKEUP VALVE

PLUG

MAIN CONTROL SPOOL

RESOLVER

LOAD CHECK VALVE FROM PUMP

FLOW CONTROL SPOOL

TO COMPENSATOR VALVE

D8R QUICK-DROP VALVE

D8R QUICK-DROP VALVE QUICK-DROP VALVE TO IMPLEMENT VALVE

TO ROD END

DOZER LIFT TO IMPLEMENT VALVE

TO HEAD END

TO IMPLEMENT VALVE DOZER TILT

QUICK-DROP VALVE HOLD

TO RIGHT CYLINDER HEAD END

TO LEFT CYLINDER HEAD END

TO RIGHT CYLINDER ROD END

TO LEFT CYLINDER ROD END

PASSAGE TO PLUNGER END VALVE SPOOL

PLUNGER

COVER

COVER

ORIFICE SLEEVE

PASSAGE TO SPOOL END TO/FROM LIFT CONTROL VALVE

QUICK-DROP VALVE DOZER RAISE

TO LEFT CYLINDER HEAD END

TO RIGHT CYLINDER HEAD END

TO RIGHT CYLINDER ROD END

TO LEFT CYLINDER ROD END

PASSAGE TO PLUNGER END PLUNGER

VALVE SPOOL

COVER

COVER

ORIFICE SLEEVE

PASSAGE TO SPOOL END TO/FROM LIFT CONTROL VALVE

QUICK-DROP VALVE DOZER LOWER

TO LEFT CYLINDER HEAD END

TO RIGHT CYLINDER HEAD END

FROM LEFT CYLINDER ROD END

FROM RIGHT CYLINDER ROD END PASSAGE TO PLUNGER END

PLUNGER

VALVE SPOOL

COVER

COVER

ORIFICE SLEEVE PASSAGE TO SPOOL END TO/FROM LIFT CONTROL VALVE

QUICK-DROP VALVE QUICK-DROP

TO LEFT CYLINDER HEAD END

TO RIGHT CYLINDER HEAD END

FROM RIGHT CYLINDER ROD END

FROM LEFT CYLINDER ROD END

PASSAGE TO PLUNGER END VALVE SPOOL

PLUNGER

COVER

COVER

ORIFICE SLEEVE PASSAGE TO SPOOL END TO/FROM LIFT CONTROL VALVE

QUICK-DROP VALVE DOZER LOWER WITH DOWN PRESSURE TO RIGHT CYLINDER HEAD END

TO LEFT CYLINDER HEAD END

FROM RIGHT CYLINDER ROD END

FROM LEFT CYLINDER ROD END

PASSAGE TO PLUNGER END PLUNGER

VALVE SPOOL

COVER

COVER

ORIFICE SLEEVE PASSAGE TO SPOOL END TO/FROM LIFT CONTROL VALVE

D8R RIPPER DIVERTER VALVE STEERING CHARGE PRESSURE

STEERING CHARGE PRESSURE PORT

RIPPER TIP RIPPER LIFT

FROM RIPPER CONTROL VALVE

RIPPER DIVERTER VALVE RIPPER TIP IN ( PORT E)

RIPPER TIP OUT (PORT F)

RIPPER LOWER (PORT C)

RIPPER RAISE (PORT D)

C CHARGE PRESSURE TEST PORT

E

RIPPER SUPPLY LOWER/TIP IN

D

F RIPPER SUPPLY RAISE/TIP OUT

D8R STARTING AND CHARGING SYSTEM 200 BK

KEY START SWITCH

321 BR

BACK-UP ALARM

R

308 YL

109 RD C OFF S ON B ST 105 RD

KEY START 10 A

BACK-UP ALARM SWITCH

121 RD

10 A

BACK-UP ALARM 101 RD

304 WH

307 OR RD 00

STARTER RELAY 200 BK

BAT MTR STARTER MOTOR

MOTOR

306 GN

MAIN RELAY

G

S

NEUTRAL-START SWITCH 109 RD

101 RD

109 RD

105 RD

112 PU

200 BK

ALTERNATOR BREAKER

BUS BAR

109 RD

FRAME RD 00

ENGINE RD 00

308 YL 200 BK

10 A FORWARD HORN

109 RD

10 A

POS NEG

+

R

POS NEG

FRONT DASH DOME

ALT

15 A

SIDE AND REAR FLOOD LAMPS/RADIO

10 A

OPERATOR MONITOR

10 A

GAUGES AND SERVICE METER

15 A

WIPER MOTORS

15 A

CIGAR LIGHTER

RD 00 RD 00

DISCONNECT SWITCH

POS NEG

POS NEG

BATTERIES

BK 00

D8R EMS PANEL COOLANT TEMPERATURE

POWER TRAIN OIL TEMPERATURE

COOLANT FLOW

POWER TRAIN OIL FILTER

ENGINE OIL PRESSURE

ALTERNATOR

HYDRAULIC OIL TEMPERATURE

HYDRAULIC OIL FILTER

CONDENSER COIL COMPRESSOR

CONDENSER FAN

ORIFICE TUBE/ DRYER

EVAPORATOR COIL

ACCUMULATOR

D8R ORIFICE TUBE SYSTEM EVAPORATOR BLOWER FAN

ORIFICE TUBE TUBE

SCREEN

O-RINGS

BODY

TABS

SCREEN

DRIVE PLATE PULLEY ASSEMBLY

HUB

COMPRESSOR CLUTCH

SHAFT

BEARING COIL ASSEMBLY

DIVERTER CAP

INLET

VAPOR LINE

ACCUMULATOR OIL BLEED LINE

OUTLET

COMPRESSOR ELECTRICAL CIRCUIT

CAPILLARY TUBE

R-134a

CAPILLARY BELLOWS ASSEMBLY

PIVOTING FRAME

CLUTCH

POINT OPENING BATTERY

THERMOSTATIC SWITCH

TEMPERATURE ADJUSTING SCREW

KEY START SWITCH

D8R OPERATOR'S STATION AIR CONDITIONING SYSTEM

R

308 YL

C OFF S ON B ST 105 RD 307 OR

KEY START 10 A

101 RD 304 WH

G

S

BAT MTR

STARTER RELAY

RD 00 306 GN 200 BK

NEUTRAL-START SWITCH

109 RD

109 RD

MAIN RELAY

STARTER MOTOR

MOTOR

112 PU

200 BK

101 RD

FRAME

BLOWER MOTOR

200 BK

BLOWER MOTOR

ENGINE RD 00

RD 00

308 YL

DISCONNECT SWITCH

BUS BAR

ALTERNATOR BREAKER

POS NEG

BK 00

POS NEG

109 RD ALT +

515 GY

515 GY

RD 00

RD 00

RESISTOR

R

POS NEG

POS NEG

BATTERIES

517 BU

516 GN 521 YL

BLOWER MOTOR BREAKER

ARC SUPPRESSOR

THERMOSTAT SWITCH

124 GN 20 A

BLOWER MOTOR SWITCH

1 2 5 4 3

513 OR

522 WH

T°

REFRIGERANT SWITCH (NORMALLY OPEN BEFORE REFRIGERANT CHARGE) AIR CONDITIONER CLUTCH

KEY START SWITCH

D8R OPERATOR'S STATION HEATING SYSTEM

R

308 YL

C OFF S ON B ST

KEY START 105 RD

10 A

101 RD

307 OR

304 WH

G

S

BAT MTR

STARTER RELAY

RD 00 306 GN 200 BK

STARTER MOTOR

MOTOR

NEUTRAL-START SWITCH

200 BK

101 RD

109 RD 109 RD

MAIN RELAY

FRAME RD 00

308 YL

BLOWER MOTOR

200 BK

BLOWER MOTOR

ENGINE RD 00

POS NEG

POS NEG

109 RD ALT +

RD 00

RESISTOR

R

RD 00 515 GY

515 GY

1 2 5 4 3

POS NEG

BATTERIES

124 GN

BLOWER MOTOR BREAKER

POS NEG

517 BU

516 GN

20 A

DISCONNECT SWITCH

BUS BAR

ALTERNATOR BREAKER

112 PU

BLOWER MOTOR SWITCH

BK 00