Boosted Governor Pressure

Version with valve body assembly without drive position "B"

44 Governor pressure booster valve
AD-3 Working pressure in drive position "D" and "3"
S1 D-2 Control pressure S1 in drive position "D" "3" and "2"
S2 Control pressure S2
S2/R Control pressure S2 at idle throttle and governor pressure at part to full throttle and at kickdown
S3 Kickdown control pressure





Version with valve body assembly with drive position "B"

VR Boosted governor pressure
O Oil sump discharge
a End face
b Annular surface
c Control edge
d Annular surface
e End face

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 assembly 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 assembly 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.