|
Fluid
Pressure, Check
If
problems arise in the functioning of the power steering, in many cases it
cannot immediately be ascertained whether the fault should be sought in the
hydraulic steering gear or in the fluid pump.
For
this purpose, the Pressure Gauge KM-354-B is connected into the hydraulic
fluid circuit. Connection points are the fluid drain of the fluid pump and
the pressure line.
Attention, fluid will escape.
|
|
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.)
