SEN04124-00 40 Troubleshooting
14 PC130-8
H-10 Hydraulic drift of work equipment is large 1
Trouble • Hydraulic drift of work equipment is large. (1) Hydraulic drift of boom is large.
Related
information
• Conduct the troubleshooting in working mode P.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Boom cylinder defective
a Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Boom cylinder Leakage from cylinder
Relieved in RAISE direction 15 cc/min
2
Defective sealing of boom
control valve (lock valve)
Sealing of the lock valve of the boom control valve may be defec-
tive. Check it directly.
3
Defective sealing of central-
ized safety-suction valve
Sealing of the centralized safety-suction valve of the control valve
may be defective. Check it directly.
Trouble • Hydraulic drift of work equipment is large. (2) Hydraulic drift of arm is large.
Related
information
• Conduct the troubleshooting in working mode P.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Arm cylinder defective
a Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Arm cylinder Leakage from cylinder
Relieved in IN direction 15 cc/min
2
Defective sealing of arm con-
trol valve (spool)
Sealing of the spool of the arm control valve may be defective.
Check it directly.
3
Defective sealing of arm con-
trol valve (suction valve)
Sealing of the suction valve of the arm control valve (on the bottom
side) may be defective. Check it directly.
4
Defective sealing of central-
ized safety-suction valve
Sealing of the centralized safety-suction valve of the control valve
may be defective. Check it directly.
Trouble • Hydraulic drift of work equipment is large. (3) Hydraulic drift of bucket is large.
Related
information
• Conduct the troubleshooting in working mode P.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Bucket cylinder defective
a Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Bucket cylinder Leakage from cylinder
Relieved in CURL direction 15 cc/min
2
Defective sealing of bucket
control valve (spool)
Sealing of the spool of the bucket control valve may be defective.
Check it directly.
3
Defective sealing of bucket
control valve (suction valve)
Sealing of the suction valve of the bucket control valve (on the bot-
tom side) may be defective. Check it directly.
4
Defective sealing of central-
ized safety-suction valve
Sealing of the centralized safety-suction valve of the control valve
may be defective. Check it directly.
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