Komatsu D155AX-7 Dozer Repair Manual

Shop Manual: 2107 pages
Operation and Maintenance Manual: 395 pages
Field Assembly Manual: 93 pages
Manuals: Shop Manual, Operation and Maintenance Manual and Field Assembly Manual
Index and Foreword
Specification
Structure and Functions
Standard Value Table
Testing and Adjusting
Troubleshooting
Disassembly and Assembly
Appendix
Circuit Diagrams
Index
Procedure for testing and troubleshooting

The air conditioner is provided with self-diagnosis functionality in order to provide for inspection of its main components. Specifically, the operation of sensors and servomotors can be examined.

If a troubled section is detected, every part of that section must be inspected.
1. After basic check, find the troubled section according to the detected trouble of the air conditioner.
2. Narrow down the sections with the self-diagnosis function (See “Check with self-diagnosis”).

If, however, the entire air conditioner unit fails to operate, inspect for problems with the supply of power to the air conditioner controller and with CAN communication between the machine monitor and the air conditioner controller.

If any part of the air conditioner unit can operate, it will indicate that the air conditioner controller is receiving power normally and that CAN communication between the machine monitor and the air conditioner controller is normal.

3. After finding out the troubled section, inspect the component parts in that section and repair the troubled part.