Komatsu Galeo PC800-8 Shop Manual page 814

SEN00794-02
Failure
• Hydraulic drift of work equipment is large
phenomenon
Relative
information
Defective seal of bucket
1
control valve (spool)
Malfunction of bucket con-
Possible causes
2 trol valve
and standard
(safety & suction valve)
value in normal
state
Defective seal of bucket
3
cylinder
20
Cause Standard value in normalcy and references for troubleshooting
Since the spool of the bucket control valve (Lo, Hi) may have a malfunc-
tion, check it directly.
Since the safety & suction valve (bottom side) of the bucket control
valve (Lo, Hi) may have a malfunction, check it directly. (The safety &
suction valve may be checked by replacing it with one of another work
equipment circuit. After checking, however, be sure to return the safety
& suction valve since its set pressure and structure are different from the
others.)
aPrepare with the engine stopped, then carry out troubleshooting with
the engine at high idle.
R.H. work equipment control lever
Relieved in bucket CURL position
(3) Hydraulic drift of bucket is large
40 Troubleshooting
Leakage from cylinder
Max. 20 cc/min
PC800, 850-8