PROBLEM POSSIBLE CAUSE PROCEDURE OR ACTION
Pump produces noise. Cavitation caused by collapsed
suction hose or clogged screen.
Drain and clean system.
Faulty oil suction. Add oil to specified level.
Air suction through loose connec-
tions on suction side.
Tighten all hose connections on
suction side.
Air suction from pump oil seal. Disassemble pump and replace oil
seals.
Breather clogged. Clean or replace breather.
Cavitation caused by high oil vis-
cosity.
Change to recommended oil and
operate pump in recommended
temperature ranges.
Abnormal temperature rise of hy-
draulic oil.
Overwork. Adjust workload to fall within
pump's operating range.
Improper viscosity or contaminated
oil.
Drain and replace oil with recom-
mended oil.
Pump case or drive gear broken. Incorrect pressure setting. Check for excessive resistance in
hydraulic circuit. Make certain re-
lief pressure is properly adjusted
and valve is working properly.
Troubleshooting 1900 YRM 1506
16
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