Komatsu 830E-AC Shop Manual page 789

Trouble
• Housing scored
heavily
• Inlet peened and
battered
• Foreign object
caught in gear teeth
• Pressure plate black
• O-rings and seals
brittle
• Gear and journals
black
• Broken shaft
• Broken housing or
flange
L10028
TROUBLESHOOTING CHART
(Hoist Pump)
Possible Cause
Damage caused by metal object -
Object not removed during a previous
failure repair.
Excessive heat.
Excessive pressure.
Hydraulic Check-out Procedure
Suggested Corrective Action
Thoroughly clean and flush hydraulic sys-
tem.
Check other system components for possi-
ble source of metallic object.
Check hoist system relief valve settings.
Verify correct hydraulic oil level.
Verify correct oil viscosity.
Check relief valve pressure.
Verify relief valve is functioning properly.
L10-21