TROUBLE SHOOTING
PROBLEM
POSSIBLE CAUSE
CORRECTION
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.
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.
Backhoe drops with control
valve spool in "centered"
position (no external oil
leakage evident.)
Cylinder piston assembly
leakage.
Check cylinders for leakage.
Note: A gradual drop over
an extended period of time
is a normal condition.
Control valve internal
leakage.
Replace control valve and recheck.
Control lever linkage
binding.
Determine origin of binding and repair.
Control valve spool
centering is broken.
Replace centering spring.
Control valve spool
binding in valve body
spool bore.
Disassemble valve for inspection and repair.
Loose hydraulic
connection.
Tighten loose connections.
Defective hydraulic hose,
tubeline, adapter fitting
or adapter fitting o-ring.
Check for origin of oil leak and replace defective
part.
Control valve o-rings
defective.
Replace defective o-rings.
Control valve spool or
body damaged or worn.
Replace control valve.
Cylinder rod packing set
leakage.
Check cylinders for leakage. Repair as needed.
External hydraulic fluid
leakage.
System relief valve
squeals.
Control valve spool(s) will
not return to centered
position.
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