Komatsu PC128US-2, PC138US-2 and PCN138USLC-2E0 Excavator Manual

Table of Contents

01 GENERAL ……………………………………………………………………………………………… 01-1
10 STRUCTURE AND FUNCTION ………………………………………………….. 10-1
20 TESTING AND ADJUSTING ………………………………………………………. 20-1
30 DISASSEMBLY AND ASSEMBLY …………………………………………….. 30-1
40 MAINTENANCE STANDARD ……………………………………………………… 40-1
90 OTHERS ………………………………………………………………………………………………… 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 PC128US-2, PC138US-2 and PCN138USLC-2E0

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

Precautions given below when carrying out the operation.

1. Precautions when carrying out removal work
• If the coolant contains antifreeze, dispose of it correctly.
• After disconnecting hoses or tubes, cover them or fit blind plugs to prevent dirt or dust from entering.
• When draining oil, prepare a container of adequate size to catch the oil.
• Confirm the match marks showing the installation position, and make match marks in the necessary places before removal to prevent any mistake when assembling.
• To prevent any excessive force from being applied to the wiring, always hold the connectors when disconnecting the connectors. Do not pull the wires.
• Fit wires and hoses with tags to show their installation position to prevent any mistake when installing.
• Check the number and thickness of the shims, and keep in a safe place.
• When raising components, be sure to use lifting equipment of ample strength.
• When using forcing screws to remove any components, tighten the forcing screws uniformly in turn.
• Before removing any unit, clean the surrounding area and fit a cover to prevent any dust or dirt from entering after removal.
a Precautions when handling piping during disassembly
Fit the following blind plugs into the piping after disconnecting it during disassembly operations.