Excessive Heating of Oil In System
HEATING CAUSED BY POWER UNIT (RESERVOIR, PUMP, RELIEF VALVE, AND
COOLERS)
CAUSE REMEDY
Relief valve set at a higher or lower pressure
than specified. Excess oil dissipated through
increased slippage in various parts, or
through relief valve
Reset relief valve to recommended pressure
Internal oil leakage due to wear Repair or replace faulty component
Viscosity of oil too high or too low Follow recommendations for correct
viscosity grade to be used.
Pumps assembled after overhaul may be
assembled too tightly. This reduces
clearances and increases rubbing friction
Follow instructions when reassembling
Leaking relief valves Repair.
Improper functioning of oil cooler Inspect cooler and see that it is working
properly.
Improper machine operation Return control to neutral when stalled,
cylinder at end of stroke, etc.
HEATING BECAUSE OF CONDITIONS IN SYSTEM
CAUSE REMEDY
Restricted lines If lines are crimped, replace; if partially
plugged for any reason, remove obstruction.
Internal leaks Locate leaks and correct
Low oil level Check oil level and fill if necessary.
T300-1_T500-1_T780
Troubleshooting
422 P/N 12261-683
REVISED: January 2015
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