Troubleshooting 1900 YRM 1018
PROBLEM POSSIBLE CAUSE PROCEDURE OR ACTION
Pump produces n
oise.
Cavitation cau
sed by collapsed suc-
tion hose or clo
gged screen.
Drain and clean
system.
Faulty oil suc
tion.
Add oil to spec
ified level.
Air suction th
rough loose connections
on suction sid
e.
Tighten all ho
se connections on suc-
tion side.
Air suction f
rom pump oil seal.
Disassemble
pump and replace oil
seals.
Breather clo
gged.
Clean or repl
ace breather.
Cavitation
caused by high oil viscosity.
Change to re
commended oil and op-
erate pump i
n recommended temper-
ature range
s.
Abnormal temperature rise of
hydraulic 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 bro-
ken.
Incorrect pressure setting. Check for excessive resistance in hy-
draulic circuit. Make certain relief pres-
sure is properly adjusted and valve is
working properly.
14
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