PUMP MAKING NOISE
CAUSE REMEDY
Pump disconnect not engaged Shut engine off and engage pump disconnect
Partially clogged intake line, intake filter or
restricted intake pipe
Clean out intake filter screen or eliminate
restriction. Be sure suction line is completely
open
Air leaks:
At pump intake pipe joints Test by pouring oil on joints while listening
for change in sound of operation. Tighten as
required
Air drawn in through inlet opening Check and add oil to reservoir if necessary
Air bubbles in oil Use hydraulic oil containing a foam
depressant.
Too high oil viscosity Work only with oil at recommended
operation temperature
Oil intake suction filter plugged Clean filter
Rag, paper, etc., pulled into suction line or
pump
Remove
Worn or broken parts Replace
EXTERNAL OIL LEAKAGE AROUND PUMP
CAUSE REMEDY
Shaft seal worn causing oil to leak into gear
drive housing
Replace
Loose fitting on pump intake or discharge Keep all joints tight
Damaged “O” ring seals between pump
sections
Replace
Damaged “O” rings at fittings Replace
EXCESSIVE WEAR
CAUSE REMEDY
Abrasive matter in the hydraulic oil being
circulated through the pump
Clean suction filter and replace return filter.
Drain & flush system as necessary
Viscosity of oil too low at working conditions1 Check oil recommendation
Sustained high pressure above maximum
pump rating
Check relief valve setting
Air recirculation causing chatter in system Check for air being drawn into system. Use
hydraulic oil with a foam depressant
T300-1_T500-1_T780
Troubleshooting
412 P/N 12261-683
REVISED: January 2015
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