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Workman HD SeriesPage 9 − 16Hydraulic System
Problem Possible Cause
Bed does not lift or lifts very slowly. Excessive load in bed.
Oil level in transaxle is low.
Engine RPM is low.
Incorrect oil in system (see oil recommendations in Operator’s
Manual).
Lift cylinder pivots or bed pivots are binding or damaged.
Hydraulic pump drive belt is loose (Workman HD vehicles).
Lift cylinder(s) is (are) worn or damaged.
Gear pump key is sheared or missing (NOTE: Entire hydraulic sys-
tem is affected).
Woodruff key on drive pulley is sheared or missing (Workman HD
vehicles) (NOTE: Entire hydraulic system is affected).
Gear pump flow or pressure is low (see Gear Pump Flow and Sys-
tem Relief Pressure Test in this chapter) (NOTE: Entire hydraulic
system is affected).
Steering inoperative or sluggish
NOTE: On a smooth surface with a
heavily loaded, stationary vehicle,
hydraulic circuit pressure to steering
control valve may be near relief
pressure.
Engine RPM is low.
Oil level in transaxle is low.
Steering components (e.g. pitman arm, tie rods, steering cylinder
rod ends) are worn or binding.
Hydraulic pump drive belt is loose (Workman HD vehicles) (NOTE:
Entire hydraulic system is affected).
Steering cylinder is binding.
Hydraulic relief valve is stuck or damaged (see Gear Pump Flow
and System Relief Pressure Test in the Testing section).
Steering control valve is worn or damaged.
Gear pump key is sheared or missing (NOTE: Entire hydraulic sys-
tem is affected).
Woodruff key on drive pulley is sheared or missing (Workman HD
vehicles) (NOTE: Entire hydraulic system is affected).
Steering cylinder leaks internally.
Gear pump flow or pressure is low (see Gear Pump Flow and Sys-
tem Relief Pressure Test in the Testing section) (NOTE: Entire hy-
draulic system is affected).
Gear pump is worn or damaged (NOTE: Entire hydraulic system is
affected).