Komatsu PC200-8M0 Shop Manual page 900

SEN06139-00
Failure (3) Hydraulic drift of bucket is large.
Related infor-
q
Perform all troubleshooting with working mode in power mode (P).
mation
1 Defective bucket cylinder
Probable
Defective seal of bucket con-
2
causes and cri-
trol valve (spool)
teria
Defective seal of bucket con
3 trol valve (pressure compen-
sation valve)
Defective seal of bucket con-
4 trol valve (safety-suction
valve)
20
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
Cause
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Left work equipment control
Seal of bucket control valve spool may be defective. Check it.
Seal of pressure compensation valve of bucket control valve may
be defective. Check it.
Seal of safety-suction valve of bucket control valve may defective.
Check it.
* You may replace the safety suction valves of the control valves
on the bottom side and head side with each other and judge
from the change of the phenomenon.
H-10 Hydraulic drift of work equipment is large
Criteria and troubleshooting procedure
lever
Bucket CURL relief
PC200, 200LC, 220, 220LC-8M0
Leakage from bucket cylinder
20 cc/min