Komatsu PC128UU-2 Excavator Repair Manual PDF

Manuals: Shop Manual
01 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01-1
10 STRUCTURE AND FUNCTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
20 TESTING, ADJUSTING AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-1
30 DISASSEMBLY AND ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-1
90 OTHER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90-1
GENERAL
This section lists the general machine dimensions, performance specifications, component weights, and fuel, coolant and lubricant specification charts.
STRUCTURE, FUNCTION AND MAINTENANCE STANDARD
This section explains the structure and function of each component. It serves not only to give an understanding of the structure, but also serves as reference material for troubleshooting.
TESTING, ADJUSTING AND TROUBLESHOOTING

This section explains checks to be made before and after performing repairs, as well as adjustments to be made at completion of the checks and repairs. Troubleshooting charts correlating Problems to Causes are also mention in this section.

DISASSEMBLY AND ASSEMBLY KOMATSU Excavator PC128UU-2
This section explains the order to be followed when removing, installing, disassembling or assembling each component, as well as precautions to be taken for these operations.
When raising heavy components, use a hoist or crane. Check that the wire rope, chains and hooks are free from damage.

Always use lifting equipment which has ample capacity. Install the lifting equipment at the correct places. Use a hoist or crane and operate slowly to prevent the component from hitting any other part. Do not work with any part still raised by the hoist or crane.

Manual Extract – Troubleshooting
| Display
Code
| Abnormal system
| Nature of abnormality
| 71
| Boom RAISE stop solenoid EPC system
| 1) Disconnection inside solenoid
2) Short circuit inside solenoid or short circuit with ground
3) Disconnection in wiring harness between C16(1), (2) – COI, or short circuit with ground
| 72
| Boom LOWER stop EPC solenoid system
| 1) Disconnection inside solenoid
2) Short circuit inside solenoid or short circuit with ground
3) Disconnection in wiring harness between C14(1), (2) – COI, or short circuit with groud
| C1
| Boom RAISE pressure switch and
boom LOWER pressure switch input at
same time for more than 3 seconds
| Defective boom RAISE or boom LOWER pressure switch