Service Manual

Workman 3000/4000 Series Page 9 -- 13 Hydraulic System
Problem Possible Cause
Lift cylinders extend with valve in
neutral position.
Load checks in hydraulic lift valve are leaking.
Lift valve lever is sticking.
Lift valve control handle is not in correct location.
Hydraulic relief valve stuck or damaged (see TEST NO. 1).
Bed drops from raised position with
lift valve in centered position.
Improperly positioned valve.
Lift valve worn or damaged.
Internal leakage of lift cylinder(s).
Lift cylinder hydraulic lines or fittings leaking.
Steering inoperative or sluggish Engine speed is low.
Oil level in transaxle is low.
Steering c omponents (Pitman arm, tie rods, steering cylinder rod
ends) w orn or binding.
Gear pump drive belt is loose (Note: Loose belt will also cause the
bed not to lift or other attachment to not operate).
Steering cylinder is binding.
Hydraulic relief valve stuck or damaged (see TEST NO. 1).
Steering control valve is worn or damaged.
Pulley k ey (either on drive or driven pulley) is sheared (lift circuit
affected as well).
Steering cylinder leaks internally.
Low gear pump flow or pressure (see TEST NO. 1) (Note: Low
pump flow or pressure will also cause the bed not to lift or other
attachment to not operate).
Gear pump is worn or damaged (Note: entire hydraulic system af-
fected).
Hydraulic
System