Baoli CPD10 - Page 113

108
Problem
Possible cause
Remedy
circuit is more than the specified
value
Oil hole is blocked
Disassembly and clean
Lower oil amount
Misadjusted relief
valve
Adjust
Noisy control valve
Misadjusted relief
valve
Adjust
Slide surface worn
Replace relief valve
Oil leakage (outside)
O-ring seal aging or
broken down
Replace O-ring seal
Lower setting pressure
Spring is worsen
Replace spring
Valve seat surface
is worsen
Adjust or replace relief
valve
Oil leakage (inside)
Valve seat surface
is worsen
Correct valve seat
surface
Higher setting pressure
Valve is held up
Disassembly and clean
2. Gear pump
Problem
Possible cause
Remedy
Less exhausting oil
Lower oil level of oil tank
Add oil up to specified level
Blocked pipe-line or oil filter
Clean or replace oil
Lower pressure of
gear pump
Lining plate, seal ring, bushing
seals or snap ring broken down
Replace
Misadjusted surplus valve
Adjust the pressure of surplus
valve to specified value with
pressure gauge.
Air entering into the pump
Retighten loose connections for
suction pipe; Add oil into oil
tank; Replace oil seal
Noisy gear pump
Worn suction pipe or
blocked oil filter
Check pipe or repair filter
Air entering in resulting from
loose suction connections
Retighten the connection
Too high oil stickiness
Use oil with proper stickiness
Air bubble in oil
Find out cause and correct
them
Oil leakage in
pump
Oil seal or seal ring broken
down
Replace
Pump broken down
Replace