S 500 Coupe (140.070) V8-5.0L (119.980) (1997)
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The spool valve (4) moves in a bore transverse to the power piston (11 ) in the steering housing and has a precise fit.
The spool valve is sealed off from the outside and secured by a screw cap (8).
The control-bar engages in a groove in the spool valve (4) and forms a unit with the steering nut (25)
The spool valve and the steering nut together with the control-bar are precision-manufactured parts and matched to each other.
CENTER POSITION
The cylindrical spool valve (4) has leading edges, which are likewise located in the housing bore in order to achieve a selected oil control by
disp1acing the servo spool valve.
When no steering forces are acting, the spool valve is held in the center position by a centering spring (12).
In this position the control cross-sections A = "from the power steering pump" and B = "to the power steering pump" are open as are the two
connections to the pressure chambers (1a, 1b) so that the oil circuit is not restricted.
