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Steering – General
Design:
Rotary valve power steering with and without Servotronic
The rotary valve power steering is a worm-and-nut steering, in
which steering shaft and steering nut are equipped with ball races.
On rotating the steering shaft, the steering nut is shifted
axially, the balls stressed by this roll down in their races,
resulting in rolling friction. The rotary valve power steering has
exceptional longevity and requires only minor steering effort.
Servotronic
In this case, the hydraulic power steering is electronically
controlled. At low vehicle speed, such as e.g. when parking, power
steering support should be high and at higher speeds e.g. driving
on the motorway, it should be low. This reduces the danger of
oversteering at high speeds.
The power assisted steering gear is maintenance free. Overhaul
or dismantling is not a dealer workshop task. All hydraulic system
hose clamps are tightened to 2.5 Nm / 1.8 lbf. ft.
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