Komatsu D155AX-8 Dozer Service Manual

Table of Contents

• Index and Foreword
• Specification
• Structure and Functions
• Standard Value Table
• Testing and Adjusting
• Troubleshooting
• Disassembly and Assembly
• Appendix
• Circuit Diagrams
• Index

1. Bleeding air and flushing of cylinder with piston valve (blade lift cylinder)

i) While running the engine at low idle, extend and retract the cylinder for 5 minutes.
However, do not move the cylinder to the stroke end.
a Operate the piston rod to approx. 100 mm from the end of the stroke; do not relieve the circuit under any circumstances.

ii) Keeping the engine at low idle, retract the cylinder to a point approx. 100 mm before the end of the stroke, then use fine control (at least 10 seconds) to retract the cylinder to the end of its stroke. While operating the lever, hold the cylinder in this position for 3 minutes.

2. Bleeding air and flushing of cylinder without piston valve (Blade tilt cylinder, ripper lift cylinder, ripper tilt cylinder)

i) Check the oil level in the hydraulic tank.
(Check that the oil level is between “L” and “H” of the sight gauge. If it is not between “L” and “H”, add oil.) a When checking the hydraulic oil level, see assembly procedure “A-10-4. Oil level check position”.

ii) While running the engine at low idle, extend and retract the cylinder for 5 minutes.
However, do not move the cylinder to the stroke end.
a Operate the piston rod to approx. 100 mm from the end of the stroke; do not relieve the circuit under any circumstances.