SL 500 (129.067) V8-5.0L (119.982) (1996)
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Steering Gear: Description and Operation
Mechanical Functions
NOTE: Numbers in parentheses ( ) indicate a component or tool in the associated illustration.
The sliding power piston (11) is located in the steering housing (1). The pitman arm shaft (43) which is also provided with a toothed sector engages in
the toothed sector of the power piston. The pitman arm shaft is pivoted on needle bearings in the steering housing (1) and in the lower housing cover.
The steering nut (25) is pivoted on thrust bearings in the power piston (11)
The steering worm (13) is held by balls inside the steering nut (25). 23 or 24 balls circulate in the ball tracks which are formed by the thread of the
steering nut (25) and steering worm (13). Hence the designation as "recirculating ball steering".
The ball circuit also forms the lower bearing of the steering worm (13). The upper bearing comprises two thrust cylindrical roller bearings in the bearing
cap (12).
If the steering worm (13) is turned, the steering nut (25) with the power piston (11) is moved axially in the steering housing via the ball
circulation and a rotary movement is transmitted to the pitman arm shah (43) via the toothed sectors.
The mechanical transmission section basically corresponds to a manual recirculating ball steering system.
