TROUBLE SHOOTING
PROBLEM
POSSIBLE CAUSE
CORRECTION
Low hydraulic fluid level. Check and replenish hydraulic fluid.
Cold hydraulic fluid.
Allow hydraulic system to warm up to operating
temperature.
Engine R.P.M. too
slow(hydraulic pump
R.P.M. too slow).
Increase engine speed to obtain satisfactory
backhoe operation.
Excessive weight in
bucket. Material weight
exceeds maximum
specified backhoe
capacity.
Reduce material load.
(Digging load)
Control valve linkage
binding/defective.
Check control valve linkage and repair if
worn/defective.
Aeration of hydraulic
fluid
Refer to "Aeration of Hydraulic Fluid".
Quick disconnect coupler
restriction or coupler
"Flow checks"
Check coupler connections. Repair or replace.
Hydraulic hose or
tubeline
restriction(hoses/tubline)
kinked or pinched.
Check hoses and tubelines for evidence of
restriction.
Boom, Dipperstick or
Bucket cylinder piston
assembly leakage.
Check cylinders for leakage. Repair as needed.
Relief valve erratic or set
below specifications.
Check and reset relief valve. Setting as needed.
Control valve leaking
internally.(hypassing fluid
within valve).
Replace control valve and recheck operation.
Hydraulic Oil viscosity
too heavy or Incorrect oil
Check oil number and viscosity, Refill correct
hydraulic oil.
Engine R.P.M. too slow.
Increase engine R.P.M.
Excessive load - material
weight exceeds specified
loader capacity.
Reduce Load.
Relief valve setting below
specifications.
Check and reset relief valve setting as needed.
Bucket, Boom and
Dipperstick cylinder
piston assembly leakage.
Check cylinders for leakge. Repair as needed.
Control valve leaking
internally
Replace control valve and recheck operation.
Hydraulic pump
defective.
Refer to "Hydraulic Pump Capacity Inadequate".
Inadequate lifting capacity
Slow or erratic move of
Cylinders (Noisy operation
of cylinders)
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