Problems Causes Countermeasures
8.Pump noise 1) Partially clogged suction filter or
suction piping.
Clean.
2) Air inhaled through suction
piping and intake pipe connections
for pump
Inspect and retighten.
3) Loosened pump cover tightening
bolts.
Inspect and retighten
4) Too rich oil viscosity Replace with fluid of adequate
viscosity.
5) Broken or worn pump parts Inspect and replace defective parts.
9.Excessive
wear,deflection or
damage of pump
1) Dirty fluid
Eliminate foreign matter and inspect
filters.
2) Circuit pressure exceeds pump
capacity
Adjust relief valve or replace if
necessary
3) Oil-less operation due to
Insufficient oil quantity
Inspect transmission oil level and
maintain specified oil level by
replenishing.In either case,clean, and
repair pump parts and replace
damaged ones if necessary.
11.Oil leaks from
piping or joints
Poorly connected piping Inspect,clean,and eliminate dust.
Repair flaws with oil stone if
necessary. Retighten.
Poor O-ring Replace
Broken piping
Replace with a new one after washing
clean related parts.
12.Oil leaks
around lift arm
Poor oil seals Replace oil seal or bushing if
necessary
13.Independent
PTO clutch slips or
is too slow in
engaging
1) Clogged fixed orifice of Flow
divider
Disassemble and wash clean.
2) Port B regulated pressure is too
slow
Inspect and reset pressure
3) Clogged PTO pressure control
valve or stuck
Disassemble and wash clean.
Repair flaws with oil stone if
necessary or replace with a new one.
4) Poor flow divider solenoid
valve
Disassemble and repair or replace
with new one if necessary .
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