Steering: Service and Repair

SI46.25-S-0003A Service Information: Processing of Steering System Complaints


1.) Complaints about noise from the vicinity of the hydraulic steering system:

Many complaints about noise from the steering system, particularly during the colder seasons, can be explained by the fluid level in the power steering pump reservoir being too low, without the system having a leak.

Depending on the reservoir, small shortages are sufficient to cause the pump to take in air or foaming fluid, which then produces noises.

As a result, if a complaint is received about noise when the engine is running, such as hissing, gushing or humming from the vicinity of the pump, first check the fluid level in the reservoir.

If the fill level is only slightly lower i.e. just under the relevant specified marking, correct this before performing any other work on the steering system and reassess the vehicle.

To prevent this type of effect, we recommend always filling the fluid level in the power steering pump reservoir to "Maximum" for the corresponding temperature, particularly during winter inspections or other relevant vehicle checks.

2.) Information on replacing the power steering pump in the case of steering system leaks:

Contrary to popular opinion, the power steering pump does not have to be replaced if the hydraulic steering system is leaking and the vehicle was driven a short distance without power steering fluid in the reservoir. Driving without power steering fluid for up to 50 km is safe and does not damage the power steering pump. Without fluid, it is not placed under any stress (pressure buildup) compared to normal operation.

The residual fluid in the pump is sufficient to provide an adequate lubricating film.

By means of precaution, perform a function and noise check on the steering system including power steering pump after repairing the steering system.

3.) General information on warranty return parts:

Sometimes there is no, or often only a very general fitter's description enclosed with the damaged parts that are returned.

However, we are dependent on a detailed description of the damage profile to be able to specifically investigate the damaged part and initiate remedial measures if necessary.

As a result, the following information must 2.) be supplied on the warranty part return slip (ARS) with all damaged parts that are returned (the ARS must be firmly attached to the component):

1. Which complaints have been registered by the customer?
2. Under which conditions did the damage occur (when, where, which operating conditions, speed, engine rpm, temperature, steering angle, etc.)?
3. Which findings did the workshop arrive at for this part?

If the regulations specified here are not complied with, we reserve the right to refuse the submitted warranty or goodwill claim.