SPECIFICATIONS

Vehicle Systems Testing And Adjusting
Lift and Tilt Cylinders
Problem: Leakage around the cylinder rod.
Probable Cause:
1. Cylinder head (bearing) seals are worn.
2. Cylinder rod is worn, scratched or bent.
Problem: There is leakage of oil inside the cylin-
der or loss of lift or tilt power.
Probable Cause:
1. The piston seals are worn and let oil go through.
2. Cylinder has damage.
Problem: The tilt cylinder rods show wear.
Probable Cause:
1. The cylinders are not in correct alignment.
2. Oil is dirty.
Problem: Foreign material behind the wiper rings
causing scratches on the cylinder rod.
Probable Cause:
1. The wiper rings shoe wear and do not remove dirt
and foreign material.
Steering System
Problem: Too much force needed to turn steering
wheel.
Probable Cause:
1. Priority valve (if equipped) releases pressure oil at
a low setting.
2. Pump oil pressure is low, worn pump.
3. Steering gear covers are too tight.
4. Steering column not aligned with steering gear.
5. Priority valve spool is held in one position.
6. Steering gear without lubrication.
7. Low fluid level in the hydraulic supply tank.
Problem: Steering wheel does not return to cen-
ter position correctly.
Probable Cause:
1. Steering gear covers are too tight.
2. Steering column is not in correct alignment.
3. Valve spool in the steering gear has a restriction.
4. Priority valve check valve permits lift and tilt
hydraulic oil to affect steering hydraulic circuit.
Problem: Oil leakage at the pump.
Probable Cause:
1. Loose hose connections.
2. Bad shaft seal.
Problem: Low oil pressure.
Probable Cause:
1. Low oil level.
2. Priority valve (if equipped) relief valve spring
weak.
3. Relief valve (priority valve) will not move from the
open position.
4. Oil leakage inside or outside of the system.
5. Bad pump.
Problem: Pump makes noise and the steering
cylinder rod does not move smoothly.
Probable Cause:
1. Air in the steering hydraulic circuit.
2. The pump has too much wear.
3. Loose connection of the oil line on the inlet side of
the pump.
4. The viscosity of the oil is wrong.
5. The oil level in the hydraulic tank is low.
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