Komatsu PC100-6, PC120-6, PC120LC-6, PC130-6 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

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.

1. Remove lock plate (I), then remove seat (2) and valve (3).
2. Remove yoke piston assembly (5) from recoil spring assembly (4).
3. Disassembly of recoil spring assembly 1) Set recoil spring assembly (4) to tool Dl.
a The recoil spring is under large installed load, so be sure to set the tool properly.
Failure to do this is dangerous.
Sr Installed load of spring : 78.4 kN(8,OOO kg)
2) Apply hydraulic pressure slowly to compress spring, then remove nut (6).
* Compress the spring to a point where the nut becomes loose.
* Release the hydraulic pressure slowly and release the tension of the spring.
Sr Remove pilot (8), cylinder (91, and dust seal (IO) from spring (7).
202FO5465A
4. Disassembly of yoke piston assembly 1) Remove wear ring (12) from yoke piston (I I).
2) Remove snap ring (13), then remove U-packing (14).