TROUBLE SHOOTING GUIDE
PROBLEM
POSSIBLE CAUSE
POSSIBLE REMEDY
Backhoe drops with valve spool in
“centered” position (no external oil
leakage evident) Note: A gradual drop
over an extended period of time is a
normal condition.
• Check cylinders for leakage.
• Replace control valve & recheck.
• Cylinder piston assembly leakage.
• Control valve internal leakage.
Control valve spool(s) will not return to
centered position.
• Determine origin of binding & repair.
• Replace centering spring.
• Disassemble valve for inspection &
repair.
• Control lever linkage binding.
• Control valve spool centering is broken.
• Control valve spool binding in valve
body spool bore.
External hydraulic fluid leakage.
• Check for origin of oil leak & replace
defective part.
• Replace defective o-rings.
• Check cylinders for leakage. Repair as
needed.
• Loose hydraulic connection.
• Defective hydraulic hose, tube line,
adapter fitting or adapter fitting o-ring.
• Control valve spool or body damaged
or worn.
• Cylinder rod packing set leakage.
Hydraulic pump capacity inadequate.
Cylinder rod bend when cylinders
extended.
• Allow hydraulic fluid to warm up to
operating temperature.
• Increase engine RPM.
• Refer to Tractor Operator’s Manual for
service recommendations.
• Check for evidence of restriction in
hydraulic hoses.
• Refer to Tractor Operator’s Manual for
service recommendations.
• Check for evidence of restriction in
hydraulic hoses.
• Refer to Tractor Operator’s Manual for
recommended service procedures.
Replace hydraulic pump if determined
to be defective.
• Cold hydraulic fluid.
• Engine RPM too slow.
• Low hydraulic fluid supply.
• Hydraulic hose restriction.
• Hydraulic pump defective.
• Replace defective parts. Review and
observe proper and safe operational
practices.
• Excessive shock load on cylinder
during transport.
