TROUBLE SHOOTING
Cylinder rod packing set
leakage.
Check cylinders for leakage. Repair as needed.
External hydraulic fluid
leakage.
Control valve o-rings
defective.
Replace defective o-rings.
Control valve spool or body
damaged or worn.
Replace control valve.
Disassemble valve for inspection and repair.
Control valve spool(s) will
not return to centered
position.
Loose hydraulic connection.
Defective hydraulic hose,
tubeline, adapter fitting or
adapter fitting o-ring.
Tighten loose connections.
Check for origin of oil leak and replace defective
part.
Control lever linkage binding. Determine origin of binding and repair.
Control valve spool centering
is broken.
Replace centering spring.
Check cylinders for leakage.
Control valve internal leakage
Note: A gradual drop over
an extended period of time
is a normal condition.
Replace control valve and recheck.
System relief valve squeals.
Backhoe drops with control
valve spool in "centered"
position (no external oil
leakage evident.)
Cylinder piston assembly
leakage.
Control valve spool binding
in valve body spool bore.
Relief valve setting below
specifications.
Check and reset valve setting as needed.
Hydraulic hose, tubeline or
quick disconnect coupler
restriction.
Check for evidence of restriction in hydraulic oil
flow. Repair or replace defective components.
Hydraulic Oil viscosity too
heavy or Incorrect oil
Check oil number and viscosity, Refill correct
hydraulic oil.
Excessive load in bucket.
Weight exceeds specified
backhoe capacity.
Reduce load.
PROBLEM POSSIBLE CAUSE CORRECTION
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