Shift Phase

See Figure

Via the 1-2 and 4-5 shift solenoid valve (Y3/6y3), the shift valve pressure (p-SV) is directed onto the end face of the command valve 1-2/4-5 (31a). The 1-2/4-5 command valve (31a) is displaced and the shift pressure (p-S) coming from the 1-2/4-5 shift pressure shift valve (29a) via the 1-2/4-5 command valve (31a) is directed to the front multiple-disc clutch (K1). At the same time the front multiple-disc brake (B1) is subjected to overlap pressure from the 1-2/4-5 overlap regulating valve (30a).

The B1 pressure acting on the end face of the 1-2/4-5 shift pressure shift valve (29a) is superseded by the working pressure (p-A). The increasing shift pressure (p-S) at the front multiple-disc clutch (K1) acts on the annular area of the 1-2/4-5 overlap regulating valve (30a). With an appropriate pressure level at the 1-2/4-5 holding pressure shift valve (28a) this valve switches over.