Fluid Pressure, Check (Power Steering)

Fill fluid pump via fluid reservoir with special fluid designated Dexron with a subsequent number D....., 90 350 341 - 19 40 699. Run engine at idle speed and immediately top up with special fluid.

The fluid pump must not be allowed to run dry.

The Pressure Gauge shows a pressure of only a few kPa (psi) with the steering centred and the shutoff valve opened. The pressure increases if the steering wheel is turned to the right or the left and reaches a maximum at full lock (see Technical Data). A small difference in pressure recorded at left and right full lock position is unimportant. Never hold steering wheel at full lock for longer than 10 seconds. This also applies when driving a vehicle with power steering.

Read off maximum pressure precisely with the shutoff valve opened and the steering wheel at full left or right lock. Then return steering to centre position, close shutoff valve and read off maximum pressure.

Note:

With the shutoff valve closed the pump still operates at maximum pressure, as if the steering wheel was in the full lock

position. The shutoff valve must therefore only be closed briefly (10 seconds at most) whilst manometer is read.

Compare two maximum pressure readings with each other.

If the maximum pressure with the valve closed and the steering centred is clearly higher, the source of the fault lies in the hydraulic steering gear. If the pressure with the valve opened and the steering wheel at full lock is below the maximum pressure, the source of the fault is to be found in the fluid pump (see Technical Data for fluid pressure values.)