Komatsu WA800-3E0, Operation & Maintenance Manual

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OPERATION
TROUBLESHOOTING
3-157
Problem Main causes Remedy
Hydraulic system
Lack of lifting power for bucket
Bucket takes time to rise
•Lack of oil
•Clogged hydraulic tank filter
•Add oil to specified level. See
EVERY 100 HOURS SERVICE
•Replace filter. See EVERY 2000
HOURS SERVICE
Excessive bubbles in oil •Low quality oil being used
•Oil level is low
•Air in oil line
•Replace with good quality oil
•Add oil to specified level. See
EVERY 100 HOURS SERVICE
•Bleed air. See WHEN REQUIRED
Hydraulic pressure is low
•Oil level is low and pump is sucking
in air •Add oil to specified level. See
EVERY 100 HOURS SERVICE
Then bleed air.
See WHEN REQUIRED
Movement of cylinder is irregular •Oil level is low
•Oil leakage the inside cylinder
•Add oil to specified level. See
EVERY 100 HOURS SERVICE
(•Check, repair)