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System relief valve
squeals.
Cold Hydraulic Fluid
Allow hydraulic fluid to warm up to
operating temperature
Hydraulic Oil viscosity too heavy
or Incorrect oil
Check oil number and viscosity, Refill
correct hydraulic oil.
Excessive load in bucket.
Loading exceeds specified
backhoe capacity
Reduce load
Relief valve setting below
specifications
Check and reset valve setting as needed
Hydraulic hose, tube line or quick
disconnect coupler restriction
Check for evidence of restriction in
hydraulic oil flow. Repair or replace
defective components
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.
Cylinder piston assembly leakage
Check cylinders for leakage
Control valve internal leakage
Replace control valve and recheck
Control valve spool(s) will not
return to centered position
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.
External hydraulic fluid
leakage
Loose hydraulic connection
Tighten loose connections
Defective hydraulic hose, tube
line, 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
Hydraulic pump
capacity inadequate
Cold hydraulic fluid
Allow hydraulic fluid to warm up to
operating temperature
Engine R.P.M. too slow
Increase engine R.P.M
Low hydraulic fluid supply
Refer to Tractor Operator's Manual for
service recommendations
Hydraulic hose restriction
Check for evidence of restriction in
hydraulic hoses
Hydraulic pump defective
Refer to Tractor Operator's Manual for
recommended service procedures.
Replace hydraulic pump if determined to
be defective
Cylinder rod bend
when cylinders
extended
Excessive shock load on
cylinders during transport
Replace defective parts. Review and
observe proper and safe operational
practices
