ReplaceBroken or fatigues oil seal or
O-ring
10.Oil leaks
outside pump
Inspect and replace defective parts.5) Broken or worn pump parts
8.Pump noise
Inspect and reset pressure2) Port B regulated pressure is too
slow
Disassemble and wash clean.1) Clogged fixed orifice of Flow
divider
13.Independent
PTO clutch slips or
is too slow in
engaging
Disassemble and wash clean.
Repair flaws with oil stone if
necessary or replace with a new one.
3) Clogged PTO pressure control
valve or stuck
Disassemble and repair or replace
with new one if necessary .
4) Poor flow divider solenoid
valve
Replace oil seal or bushing if
necessary
Poor oil seals
12.Oil leaks
around lift arm
Replace with a new one after washing
clean related parts.
Broken piping
ReplacePoor O-ring
Inspect,clean,and eliminate dust.
Repair flaws with oil stone if
necessary. Retighten.
Poorly connected piping11.Oil leaks from
piping or joints
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.
3) Oil-less operation due to
Insufficient oil quantity
Adjust relief valve or replace if
necessary
2) Circuit pressure exceeds pump
capacity
Eliminate foreign matter and inspect
filters.
1) Dirty fluid
Replace with fluid of adequate
viscosity.
4) Too rich oil viscosity
Inspect and retighten3) Loosened pump cover tightening
bolts.
Inspect and retighten. 2) Air inhaled through suction
piping and intake pipe connections
for pump
Clean.1) Partially clogged suction filter or
suction piping.
9.Excessive
wear,deflection or
damage of pump
CountermeasuresCausesProblems
9-31
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