Hydraulic Drift Of Work Equipment Is Large - Komatsu PC200-8M0 Shop Manual

500 Troubleshooting of hydraulic and mechanical system (H-mode)
H-10 Hydraulic drift of work equipment is large
H-10 Hydraulic drift of work equipment is large
Failure (1) Hydraulic drift of boom is large.
Related infor-
q
Perform all troubleshooting with working mode in power mode (P).
mation
1 Defective boom cylinder
Probable
causes and cri-
teria
Defective seal of boom con-
2
trol valve (lock valve)
Defective seal of safety
3
valve for lock valve
Failure (2) Hydraulic drift of arm is large.
Related infor-
q
Perform all troubleshooting with working mode in power mode (P).
mation
1 Defective arm cylinder
Defective seal of arm con-
2
trol valve (spool)
Probable
causes and cri- Defective seal of arm con-
teria
3 trol valve (pressure compen-
sation valve)
Defective seal of arm con-
4
trol valve (suction valve)
Defective seal of safety
5
valve for lock valve
PC200, 200LC, 220, 220LC-8M0
Cause
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Right work equipment control
Sealing of the lock valve of the boom control valve may be defec-
tive. Check it.
Seal of safety valve for lock valve may be defective. Check it.
Cause
a Be ready with engine stopped, then troubleshoot with engine
high idle.
Left work equipment control
Seal of arm control valve spool may be defective. Check it.
Seal of pressure compensation valve of arm control valve may be
defective. Check it.
Seal of suction valve of arm control valve may be defective. Check
it.
* Judgment can be made by checking a change of phenomenon
after exchanging suction valve with one for other than the arm
control valve.
Seal of safety valve for lock valve may be defective. Check it.
Criteria and troubleshooting procedure
lever
Boom RAISE relief
Criteria and troubleshooting procedure
lever
Arm IN relief
SEN06139-00
Leakage from boom cylinder
20 cc/min
Leakage from arm cylinder
20 cc/min
40-500
19