Komatsu WA270-8 Wheel Loader Service Repair Manual

Table of Contents

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.