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Troubleshooting (Continued)
Problem Cause Correction
Leaky cylinders Oil is bypassing cylinder piston, Replace or rebuild the cylinder; replace
scored piston, worn piston damaged parts.
packing, or defective piston
assembly
Scored piston rods and worn Replace or rebuild the cylinder; replace
guides in cylinder damaged parts.
Bent piston rod in cylinder Replace or rebuild the cylinder; replace
damaged parts.
Worn or damaged rod seals on Repack cylinder. Rebuild cylinder,
cylinder; external leaks replacing damaged parts as necessary.
Leaky valve Loose oil line connections, Tighten all hose connections and
leaks in line or broken lines replace any damaged O-rings at
leaking O-ring fittings. Check and
replace any damaged hoses and lines.
Excessive back pressure Relieve condition. Restriction may be
from outlet to reservoir.
Paint on valve spool; sticking Clean valve spool. Binding is usually
valve spool or scored valve caused from an over tightened plug,
spool mounting bolt, fitting in valve body or
tie rod bolt. If a plug or fitting in the
valve body is leaking, do not overtighten
in an effort to stop leak. This will distort
body casting and cause spools to bind.
Instead, the plug and fitting should be
removed from valve body and be
reconnected, using a new O-ring. Do
not apply excessive pressure on
mounting bolts. The rods should be
torqued to 30 ft. lbs. Never force spool.
Ball in anti-cavitation check Clean anti-cavitation valve carefully,
valve is stuck or not seating being sure that checks move freely and
properly. seat properly, or replace cartridge.
Sticky valve spool Paint on valve spool; sticking Clean valve spool. Binding is usually
valve spool or scored valve caused from an over tightened plug,
spool mounting bolt, fitting in valve body or
tie rod bolt. If a plug or fitting in the
valve body is leaking, do not overtighten
in an effort to stop leak. This will distort
body casting and cause spools to bind.
Instead, the plug and fitting should be
removed from valve body and be
reconnected, using a new O-ring. Do
not apply excessive pressure on
mounting bolts. The rods should be
torqued to 30 ft. lbs. Never force spool.
Bent spool Replace with new spool section.
Foreign particles Clean system and valve.
Misalignment of control handle Check linkage for binding condition.
linkage