Komatsu Wheel Loader WA250-5 WA250PT-5 (SERIAL NUMBERS 70001 and up) Shop Manual

COVER

CONTENTS
01 GENERAL
GENERAL ASSEMBLY DRAWINGS
SPECIFICATIONS
WEIGHT TABLE
LIST OF LUBRICANT AND COOLANT
10 STRUCTURE,FUNCTION AND MAINTENANCE STANDARD
ENGINE MOUNT AND TRANSFER MOUNT
DAMPER
COOLING SYSTEM
TRANSFER OIL COOLER
POWER TRAIN
POWER TRAIN SYSTEM DIAGRAM
DRIVE SHAFT (PROPELLER SHAFT)
HST HYDRAULIC PIPING DIAGRAM
HST PUMP
HIGH-PRESSURE RELIEF VALVE
LOW-PRESSURE RELIEF VALVE
HST CHARGE PUMP
SPEED-RELATED VALVE (DA VALVE)
HIGH-PRESSURE CUT-OFF VALVE
HST MOTOR
EP SERVO VALVE
HA SERVO VALVE
FORWARD-REVERSE SHUTTLE VALVE
TRANSFER
CLUTCH SOLENOID VALVE
AXLE
DIFFERENTIAL
LIMITED-SLIP DIFFERENTIAL
FINAL DRIVE
AXLE MOUNTING AND CENTER HINGE PIN
STEERING PIPING
STEERING COLUMN
PRIORITY VALVE
ORBIT-ROLL VALVE
2-WAY RESTRICTOR VALVE
CUSHION VALVE
STEERING CYLINDER
EMERGENCY STEERING PIPING
EMERGENCY STEERING VALVE
BRAKE PIPING
BRAKE VALVE
INCHING VALVE
CHARGE VALVE
ACCUMULATOR (FOR BRAKE)
SLACK ADJUSTER
BRAKE
PARKING BRAKE CONTROL
PARKING BRAKE
HYDRAULIC PIPING
HYDRAULIC TANK
4-GEAR PUMP UNIT
ACCUMULATOR (FOR PPC CIRCUIT)
LOCK VALVE
BYPASS VALVE
QUICK COUPLER VALVE
E.C.S.S. VALVE
ACCUMULATOR (FOR E.C.S.S.)
HYDRAULIC PIPING OF COOLING SYSTEM
COOLING FAN MOTOR
WORK EQUIPMENT CONTROL VALVE
WORK EQUIPMENT PPC VALVE
ATTACHMENT PPC VALVE (IF EQUIPPED)
WORK EQUIPMENT LINKAGE
BUCKET
CONTROL OF BUCKET POSITIONER, BOOM KICK-OUT, AND DUMP SPEED
WORK EQUIPMENT CYLINDER
AIR CONDITIONER (IF EQUIPPED)
MACHINE MONITORING SYSTEM
MACHINE MONITOR
LIST OF ITEMS DISPLAYED ON MONITOR
ELECTRICAL SYSTEM (HST CONTROLLER SYSTEM)
HST CONTROLLER
ENGINE START CIRCUIT
ENGINE STOP CIRCUIT
PREHEATING CIRCUIT (AUTOMATIC PREHEATING SYSTEM)
PARKING BRAKE CIRCUIT
ELECTRONICALLY CONTROLLED SUSPENSION SYSTEM
SENSORS
20 TESTING AND ADJUSTING
STANDARD VALUE TABLE FOR ENGINE
STANDARD VALUE TABLE FOR CHASSIS
TESTING AND ADJUSTING
TROUBLESHOOTING
30 DISASSEMBLY AND ASSEMBLY
HOW TO READ THIS MANUAL
PRECAUTIONS WHEN PERFORMING OPERATION
SPECIAL TOOL LIST
SKETCHES OF SPECIAL TOOLS
REMOVAL, INSTALLATION OF FUEL INJECTION PUMP ASSEMBLY
REMOVAL, INSTALLATION OF NOZZLE HOLDER ASSEMBLY
REMOVAL, INSTALLATION OF CYLINDER HEAD ASSEMBLY
REMOVAL, INSTALLATION OF ENGINE ASSEMBLY
REMOVAL, INSTALLATION OF RADIATOR ASSEMBLY
REMOVAL, INSTALLATION OF AIR AFTERCOOLER
REMOVAL, INSTALLATION OF HYDRAULIC OIL COOLER ASSEMBLY
REMOVAL, INSTALLATION OF COOLING FAN AND FAN MOTOR ASSEMBLY
REMOVAL, INSTALLATION OF FUEL TANK ASSEMBLY
REMOVAL, INSTALLATION OF TRANSFER
DISASSEMBLY, ASSEMBLY OF TRANSFER ASSEMBLY
REMOVAL, INSTALLATION OF PARKING BRAKE ASSEMBLY
DISASSEMBLY, ASSEMBLY OF PARKING BRAKE ASSEMBLY
REMOVAL, INSTALLATION OF FRONT AXLE ASSEMBLY
REMOVAL, INSTALLATION OF REAR AXLE ASSEMBLY
DISASSEMBLY, ASSEMBLY OF AXLE HOUSING ASSEMBLY
DISASSEMBLY, ASSEMBLY OF DIFFERENTIAL ASSEMBLY
DISASSEMBLY AND ASSEMBLY OF HST PUMP ASSEMBLY
DISASSEMBLY AND ASSEMBLY OF HST MOTOR ASSEMBLY
REMOVAL, INSTALLATION OF WORK EQUIPMENT CONTROL VALVE ASSEMBLY
REMOVAL, INSTALLATION OF TRAVEL DAMPER VALVE ASSEMBLY (IF EQUIPPED)
REMOVAL, INSTALLATION OF HYDRAULIC TANK ASSEMBLY
REMOVAL, INSTALLATION OF WORK EQUIPMENT ASSEMBLY
DISASSEMBLY, ASSEMBLY OF HYDRAULIC CYLINDER ASSEMBLY
REMOVAL, INSTALLATION OF OPERATOR’S CAB ASSEMBLY
REMOVAL, INSTALLATION OF OPERATOR’S CAB GLASS (STUCK GLASS)
REMOVAL, NSTALLATION OF CENTER HINGE PIN
REMOVAL, INSTALLATION OF COUNTERWEIGHT
REMOVAL, INSTALLATION OF AIR CONDITIONER UNIT ASSEMBLY
REMOVAL, INSTALLATION OF CONDITIONER COMPRESSOR ASSEMBLY
REMOVAL, INSTALLATION OF MONITOR PANEL
REMOVAL, INSTALLATION OF HST CONTROLLER ASSEMBLY
90 OTHERS
HYDRAULIC CIRCUIT DIAGRAM WA250-5
HYDRAULIC CIRCUIT DIAGRAM WA250PT-5
ELECTRICAL CIRCUIT DIAGRAM 1/4 (1/4) (MACHINES EQUIPPED WITH ROPS CAB)
ELECTRICAL CIRCUIT DIAGRAM 1/4 (2/4) (MACHINES EQUIPPED WITH ROPS CAB)
ELECTRICAL CRICUIT DIAGRAM 1/4 (3/4) (MACHINES EQUIPPED WITH ROPS CAB)
ELECTRICAL CRICUIT DIAGRAM 1/4 (4/4) (MACHINES EQUIPPED WITH ROPS CAB)
ELECTRICAL CIRCUIT DIAGRAM 2/4 (MACHINES EQUIPPED WITH ROPS CAB)
ELECTRICAL CIRCUIT DIAGRAM 3/4 (MACHINES EQUIPPED WITH ROPS CAB)
ELECTRICAL CIRCUIT DIAGRAM 4/4 (MACHINES EQUIPPED WITH ROPS CAB)
ELECTRICAL CIRCUIT DIAGRAM 1/4 (1/4) (MACHINES EQUIPPED WITH ROPS CANOPY
ELECTRICAL CIRCUIT DIAGRAM 1/4 (2/4) (MACHINES EQUIPPED WITH ROPS CANOPY)
ELECTRICAL CIRCUIT DIAGRAM 1/4 (3/4) (MACHINE EQUIPPED WITH ROPS CANOPY)
ELECTRICAL CIRCUIT DIAGRAM 1/4 (4/4) (MACHINE EQUIPPED WITH ROPS CANOPY)
ELECTRICAL CIRCUIT DIAGRAM 2/4 (MACHINES EQUIPPED WITH ROPS CANOPY)
ELECTRICAL CIRCUIT DIAGRAM 3/4 (MACHINES EQUIPPED WITH ROPS CANOPY)
ELECTRICAL CIRCUIT DIAGRAM 4/4 (MACHINES EQUIPPED WITH ROPS CANOPY)