As a service man you will usually be confronted with complaints in three general areas:
1. Hard steering.
2. External leakage.
3. Undesired steering actions other than hard steering. (Shimmy, wander, over-steer, etc.).
This manual will not give detailed instructions on how to make repairs and adjustments. Use your regular service manuals
for repairs and adjustments.
In troubleshooting complaints on hydraulic power steering, avoid guess work and try to make definite determinations.
Make a thorough diagnosis first, that is, define the complaint as thoroughly as possible.
Diagnosis requires observing symptoms and making tests or checks to establish the cause of the trouble. Try to visualize
what is occurring. For certain trouble certain symptoms should be looked for.
The first step is to get a good account or description of the trouble or complaint from the driver. Ask the driver:
How does the steering act?
Does it act this way all the time?
Does it occur on only one direction (right or left turn or straight ahead?)
Under what conditions does it usually occur?
Is it accompanied by an unusual noise?
Since verbal description and interpretation can vary widely it is better to have the driver demonstrate exactly what he is
complaining about. If you are still unable to define the complaint, ask him to accompany you and drive the vehicle
Perform actions in which the driver said trouble occurred. Try other steering action, too, to give you a complete and
accurate definition of the trouble. You may want to try these:
1. Turn steering wheel while standing or moving slowly. (Not standing with vehicle loaded--hydraulic power may not be
2. Steer on both directions while moving.
3. Turn steering wheel rapidly one or two turns--in both directions.
4. Observe action when traveling straight ahead.
This should give you a good understanding of the complaint.
The next step is to determine the cause of the trouble and how to remedy it.
For common symptoms of trouble, make a general inspection of the system and check for conditions such as:
1. Low oil supply in reservoir.