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PROBLEM
POSSIBLE CAUSE
REMEDY
Incapable of maintaining.
Internal oil leak at the spool.
Replace entire valve housing & spool.
the load.
Oil leaking at relief valve port.
Disassemble and clean or replace
relief valve.
Load check poppet or seat damaged
Replace poppet and seat assembly.
(located inside sections).
Spool sticking or does
Hydraulic oil contaminated.
Drain and replace with fresh oil. Also
NOT move.
replace Filters.
Valve clogged with dirt.
Remove dirt and clean assembly.
Inside of plunger cap filled with oil.
Replace seal on end of cap.
Foreign matter at spool internal stop.
Remove foreign matter or replace
entire valve section & spool assembly.
Pressure too high
Using pressure gauge, readjust pressure.
Lever or link bent.
Remove and replace.
Spool bent.
Replace entire valve assembly.
Return spring failing.
Replace spring.
Return spring or cap misaligned.
Loosen, realign and retighten.
System oil temperature distribution
Allow sufficient warm-up for
NOT uniform.
entire system.
Oil leaking at seals.
Paint sticking at seal.
Remove and clean the seal.
Back-pressure in valve.
Replace hydraulic Oil Filter.
Dirt in seal.
Remove and clean the seal.
Seal plate has loosened.
Replace valve housing as assembly.
Seal broken or damaged.
Remove and replace seal.
Controls feel heavy.
Foreign matter in control valve spool.
Clean control valve.
Valve spool sticking.
Replace entire valve housing.
Control linkage lacking lubrication.
Properly lubricate.
DRIVE AND MAIN CONTROL VALVES
907389/AP297
40
Printed In U.S.A.
Discount-Equipment.com