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.
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 vehicle malfunction.
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 vehicle, turn off
the engine, locate the cause of the trouble and correct
it before allowing the vehicle to be used again. Contin-
Refer to the Testing section of this Chapter for precau-
tions and specific test procedures.
Problem
Possible Cause
Fitting(s), hose(s), or tube(s) are loose or damaged.
Hydraulic oil leaks.
O–ring(s) or seal(s) are missing or damaged.
Squealing noise.
Hydraulic lift valve held in raise or lower position (hydraulic oil flow-
ing over relief valve).
Hydraulic oil is overheating.
Oil level in transaxle is incorrect.
Hydraulic oil is contaminated or incorrect oil (use Dexron III ATF).
Kinked or severely bent hose or tubing.
Hydraulic oil going over relief valve excessively (too heavy a load
on hydraulic system or quick coupler disconnected with lift valve
engaged).
Suction screen in transaxle is loose or clogged.
Worn or damaged hydraulic gear pump (Note: entire hydraulic sys-
tem affected).
Transaxle or drive train problem (see Drive Train – Chapter 7).
Excessive load in bed.
Bed does not lift or lifts too slowly.
Oil level in transaxle is low.
Engine RPM is low.
Incorrect oil in system (use Dexron III ATF).
Lift cylinder pivots or bed pivots are binding or damaged.
Hydraulic pump drive belt loose.
Lift cylinder(s) worn or damaged.
Sheared key on gear pump shaft (Note: entire hydraulic system
affected).
Low gear pump flow or pressure (see TEST NO. 1) (Note: entire
hydraulic system affected).
Hydraulic System
Page 9 – 12
Workman 3000/4000 Series
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