Komatsu WA270-8 Wheel Loader Service Repair Manual

Manuals: Shop Repair Manual
00 INDEX AND FOREWORD
INDEX
ABBREVIATION LIST
FOREWORD, SAFETY, BASIC INFORMATION
01 SPECIFICATIONS
CONTENTS
ABBREVIATION LIST
SPECIFICATIONS
10 STRUCTURE AND FUNCTION
CONTENTS
ABBREVIATION LIST
UREA SCR SYSTEM
BOOT-UP SYSTEM
ENGINE SYSTEM
COOLING SYSTEM
CONTROL SYSTEM
HYDRAULIC SYSTEM
POWER TRAIN SYSTEM
WORK EQUIPMENT SYSTEM
STEERING SYSTEM
BRAKE SYSTEM
AUTO-GREASING SYSTEM
UNDERCARRIAGE AND FRAME
WORK EQUIPMENT
CAB AND ITS ATTACHMENTS
20 STANDARD VALUE TABLE
CONTENTS
ABBREVIATION LIST
STANDARD VALUE TABLE FOR ENGINE
STANDARD VALUE TABLE FOR MACHINE
30 TESTING AND ADJUSTING
CONTENTS
ABBREVIATION LIST
RELATED INFORMATION ON TESTING AND ADJUSTING
ENGINE AND COOLING SYSTEM
POWER TRAIN
STEERING SYSTEM
BRAKE SYSTEM
HYDRAULIC SYSTEM
WORK EQUIPMENT
CAB AND ITS ATTACHMENTS
ELECTRICAL SYSTEM
AUTO-GREASING DEVICE
Pm CLINIC
40 TROUBLESHOOTING
CONTENTS
ABBREVIATION LIST
RELATED INFORMATION ON TROUBLESHOOTING
TROUBLESHOOTING BY FAILURE CODE (DISPLAY OF CODE)
TROUBLESHOOTING OF ELECTRICAL SYSTEM (E-MODE)
TROUBLESHOOTING FOR HYDRAULIC AND MECHANICAL SYSTEMS (H MODE)
TROUBLESHOOTING OF ENGINE (S-MODE)
TROUBLESHOOTING FOR AUTO-GREASING SYSTEM
50 DISASSEMBLY AND ASSEMBLY
CONTENTS
ABBREVIATION LIST
RELATED INFORMATION ON DISASSEMBLY AND ASSEMBLY
ENGINE AND COOLING SYSTEM
POWER TRAIN
UNDERCARRIAGE AND FRAME
HYDRAULIC SYSTEM
WORK EQUIPMENT
CAB AND ITS ATTACHMENTS
ELECTRICAL SYSTEM
60 MAINTENANCE STANDARD
CONTENTS
ABBREVIATION LIST
ENGINE AND COOLING SYSTEM
POWER TRAIN
STEERING SYSTEM
BRAKE SYSTEM
UNDERCARRIAGE AND FRAME
HYDRAULIC SYSTEM
WORK EQUIPMENT
CAB AND ITS ATTACHMENTS
80 APPENDIX
CONTENTS
ABBREVIATION LIST
AIR CONDITIONER SYSTEM
COMPONENT PARTS OF AIR CONDITIONER SYSTEM
EXPLANATION OF PROCEDURE FOR TESTING AND TROUBLESHOOTING OF AIR CONDITIONER
CIRCUIT DIAGRAM AND ARRANGEMENT OF CONNECTOR PINS FOR AIR CONDITIONER
AIR CONDITIONER SYSTEM DIAGRAM
INSTALLATION LOCATIONS OF AIR CONDITIONER PARTS AND ARRANGEMENT OF CONNECTORS
TESTING AIR CONDITIONER USING SELF-DIAGNOSIS FUNCTION
HOW TO OPEN THE ELECTRICAL SYSTEM ABNORMALITY RECORD SCREEN IN SERVICE MODE OF THE MACHINE MONITOR
CHECK TEMPERATURE CONTROL FUNCTION
TEST VENT (MODE) CHANGEOVER
TESTING FRESH/RECIRC AIR CHANGEOVER
TEST EVAPORATOR TEMPERATURE SENSOR
TEST RELAYS
AIR CONDITIONER TROUBLESHOOTING CHART 1
AIR CONDITIONER TROUBLESHOOTING CHART 2
FAILURE CODE [879AKA]FAILURE CODE [879AKB]FAILURE CODE [879BKA]FAILURE CODE [879BKB]FAILURE CODE [879CKA]FAILURE CODE [879CKB]FAILURE CODE [879DKZ]FAILURE CODE [879EMC]FAILURE CODE [879FMC]A-1 TROUBLESHOOTING FOR POWER SUPPLY SYSTEM (AIR CONDITIONER DOES NOT OPERATE)
A-2 TROUBLESHOOTING FOR COMPRESSOR AND REFRIGERANT SYSTEM (AIR IS NOT COOLED)
A-3 TROUBLESHOOTING FOR BLOWER MOTOR SYSTEM (NO AIR COMES OUT OR AIR FLOW IS ABNORMAL)
A-4 TROUBLESHOOTING FOR FRESH/RECIRC AIR CHANGEOVER
TROUBLESHOOTING USING GAUGE PRESSURE
CONNECTION OF SERVICE TOOL
PRECAUTIONS FOR DISCONNECTING AND CONNECTING HOSES AND TUBES IN AIR CONDITIONER PIPINGS
HANDLE COMPRESSOR OIL
90 CIRCUIT DIAGRAMS
CONTENTS
ABBREVIATION LIST
HYDRAULIC CIRCUIT DIAGRAM
ELECTRICAL CIRCUIT DIAGRAM
INDEX
Manual Extract Battery disconnect switch function:
Precautions for using battery disconnect switch
The system operating lamp lights up when the controller is turned ON. Even if the starting switch is in the OFF position, the lamp lights up while the KOMTRAX is performing communication.
Do not turn OFF the battery disconnect switch while the system operating lamp is lighting up.
If the battery disconnect switch is turned OFF while the lamp is lighting up, the data in the controller may be lost and the controller may be damaged seriously.
Do not turn OFF the battery disconnect switch while the engine is running or immediately after the engine is stopped.

If the battery disconnect switch is turned OFF while the alternator is generating power, the generated current has nowhere to go, leading to overvoltage in the electrical system of the machine, which may cause serious damage to the electrical system, including the electric devices and controllers.

If the battery disconnect switch is turned OFF for a long period, the machine monitor and the clock of the radio may be initialized. In this case, re-setting is required.