Service Manual

Troubleshooting
The cause of an improperly functioning hydraulic system
is best diagnosed with the use of proper testing equip-
ment and a thorough understanding of the complete hy-
draulic system.
A hydraulic system with an excessive increase in heat or
noise is a potential failure. Should either of these condi-
tions be noticed, immediately stop the machine, turn of
f
the engine, locate the cause of the trouble, and correct
it before allowing the machine to be used again. Contin-
ued use of an improperly functioning hydraulic system
could lead to extensive internal component damage.
The charts that follow contain information to assist in
troubleshooting. There may possibly be more than one
cause for a machine malfunction.
Refer to the Testing section of this Chapter for precau-
tions and specific test procedures.
Problem Possible Causes
Hydraulic oil leak(s). Fitting(s), hose or tube loose or damaged.
Missing or damaged o–
ring.
Squealing noise. Remote hydraulic valve left in ON detent position
(hydraulic oil flowing over relief valve).
Hydraulic oil overheating. Hydraulic oil level low.
Kinked or severely bent hose or tubing.
Hydraulic oil going over relief valve excessively (too
heavy a load on remote hydraulics or quick coupler
disconnected with remote valve engaged).
Damaged pump.
Oil level in transaxle too high.
Dump box does not lift or lifts too slowly. Excessive load in dump box.
Pump drive belt loose.
Sheared key on pump shaft.
Hydraulic oil level too low.
Low engine RPM.
Lift cylinder pivots or dump box pivots binding or
damaged.
Lift cylinder(s) worn or damaged.
Hydraulic oil overheated or too thin (improper oil).
Low pump flow or pressure – TEST NO. 1.
Lift (dump) cylinders extend with valve in neutral Load checks in valve leaking.
position.
Hydraulic System Page 9
– 10 Workman 3000/4000 Series