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3. Hydraulic System
Trouble
Insufficient power: all actuators
Insufficient power: front attachment
Machine does not travel smoothly.
Machine mistracks
Insufficient swing power or jerky
upperstructure swing
NOTE: Contact your authorized dealer for any inspection, adjustment, repair, and/or replacement as required.
TROUBLESHOOTING
Cause
• Insufficient engine power
• Excessively worn hydraulic pump
• Main relief valve failure
• Hydraulic oil is low.
• Suction filter restriction
• Failure or incorrect pressure set-
ting of main or pilot relief valve
• Damaged hydraulic cylinder
packing
• Damaged cylinder piston or cyl-
inder tube
• Too tight track (sag)
• Foreign matter, such as rocks,
stuck in the tracks
• Counterbalance valve failure
• Travel motor performance drop
• Track sag is not equal on both
sides
• Hydraulic pump performance
drop
• Oil leak inside control valve
• Hydraulic pump performance
drop
• Low pressure valve setting
• Swing motor performance drop
• Swing bearing seizure
• Foreign matter sticking in brake
valve
• Oil leak inside control valve
11-2
Solution
• Inspect and repair.
• Replace.
• Re-adjust pressure setting, or re-
place.
• Add hydraulic oil.
• Clean or replace.
• Re-adjust pressure setting, or re-
place.
• Replace cylinder packing.
• Replace cylinder piston, cylinder
tube, or the cylinder.
• Adjust track sag.
• Remove foreign matter.
• Replace.
• Replace.
• Adjust track sag properly (and
equally on both sides).
• Replace.
• Replace the control valve.
• Replace.
• Adjust pressure setting, or re-
place.
• Replace.
• Lubricate or replace swing bear-
ing.
• Clean the brake valve.
• Replace the control valve.
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