Boosted governor pressure - RA27007229160X(27-9160)

WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Boosted Governor Pressure Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The boosted governor pressure determines only the 1 → 2 → 1 shift points.

This pressure is derived from the working pressure "AD-3" or from the control pressure "S1 D-2", depending on the valve body assy version, and controlled at the governor pressure booster valve (44).

The pressure which passes to the end face (a) is the control pressure "S2" when the accelerator is in the idle throttle position, and the governor pressure at part to full throttle or at kickdown. The pressures at the annular surfaces (b) and (d) and also at the end face (e) counteract the pressure at the end face (a) and act on the valve (44) to push it into the control position.

The control is performed at the control edge (c) and at the zero discharge. The boosted governor pressure "VR" rises as governor pressure "R" increases and passes through the two-way valve (42) to the 1 → 2 command valve.

Depending on the valve body assy version, the shape and dimensions of the governor pressure booster valve (44) differ. A spring is installed on the left or right side in some cases to harmonize the 1 → 2 → 1 shift program.