Time Lag Of Work Equipment Is Large - Komatsu Galeo PC800-8 Shop Manual

40 Troubleshooting
H-12 Time lag of work equipment is large
Failure

• Time lag of work equipment is large

phenomenon
Relative
information
Possible causes
and standard
Malfunction of boom con-
value in normal
1 trol valve (safety & suction
state
valve)
Failure
• Time lag of work equipment is large
phenomenon
Relative
information
Possible causes
and standard
Malfunction of arm control
value in normal
1 valve (safety & suction
state
valve)
Failure
• Time lag of work equipment is large
phenomenon
Relative
information
Possible causes
and standard
Malfunction of bucket con-
value in normal
1 trol valve (safety & suction
state
valve)
PC800, 850-8
Cause Standard value in normalcy and references for troubleshooting
Since the safety & suction valve (head side) of the boom control valve
(Lo) may have a malfunction, check it directly. (When checking by
replacing the safety & suction valve with one of another work equipment
circuit, stop the oil in the machine pushup solenoid hose securely. After
checking, be sure to return the safety & suction valve since its set pres-
sure and structure are different from the others.)
Cause Standard value in normalcy and references for troubleshooting
Since the safety & suction valve (bottom side) of the arm 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 equip-
ment circuit. After checking, however, be sure to return the safety & suc-
tion valve since its set pressure and structure are different from the
others.)
Cause Standard value in normalcy and references for troubleshooting
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.)
(1) Time lag of boom is large
(2) Time lag of arm is large
(3) Time lag of bucket is large
SEN00794-02
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