TM 5-3895-382-24
Problem: Too much force is needed to turn the steering
wheel.
Probable Cause:
1.
Relief valve is open.
2.
Low oil level in the hydraulic oil tank.
3.
Steering pump oil pressure is too low, caused by a worn
steering pump.
4.
Steering control unit covers are too tight.
5.
Steering control unit is defective.
6.
Hydraulic oil is cold.
7.
Alignment of steering column is not correct.
Problem: Machine does not turn when steering wheel is
turned.
Probable Cause:
1.
Low oil level in the hydraulic oil tank.
2.
Air in the hydraulic system.
3.
Dirt in the hydraulic system.
4.
Steering pump operation is not correct.
5.
Frame articulation is locked because the lock pin is in
position.
Problem: Machine turns too slow in both directions.
Probable Cause:
1.
Not enough oil flow from steering pump.
2.
Steering pump suction line is restricted.
3.
Steering control unit operation is not correct.
4.
Seal leakage in the steering cylinders.
5.
Priority valve spool inside steering pump does not allow
enough oil to go to the steering control unit.
Problem: Machine turns too slow in one direction.
Probable Cause:
1.
Restriction in steering control unit.
Problem: The steering control unit does not return to
center position correctly.
Probable Cause:
1.
Steering control unit covers are too tight.
2.
Alignment of the steering column is not correct.
3.
Valve spool in the steering control unit has a restriction.
Problem: Temperature of hydraulic oil is too hot.
Probable Cause:
1.
Viscosity of the hydraulic oil is wrong.
2.
Air is mixed with the hydraulic oil.
3.
Steering system relief valve has a defect.
4.
There is a restriction in the one of the steering system
lines or components.
Problem: Steering wheel turns without the operator
turning it.
Probable Cause:
1.
Foreign material causes the sleeve valves in steering
control unit to stick.
2.
Centering springs are broken or damaged in the
steering control unit.
3.
Timing of the steering control unit drive is not correct.
The drive must be timed as follows.
If the steering control unit drive is not timed correctly, the
machine can turn in the opposite direction as the steering
wheel. To prevent personal injury, loss of life and/or
property damage, make sure the drive is timed as follows.
14-14
