GF27.60-P-4013N Shift From 1 to 2, Function

GF27.60-P-4013N Shift From 1 to 2, Function
TRANSMISSION 722.9 in MODEL 171.4, 203, 230 up to Model Year 2008
TRANSMISSION 722.9 in MODEL 209, 211, 215, 219, 220
TRANSMISSION 722.9 in MODEL 463.303 /340 /341 up to 31.5.12

In 1st gear the multi-disk brake B2, the multi-disk brake B3 and the multi-disk clutch K3 are engaged. During the shift from 1st gear into 2nd gear the multi-disk brake B3 is disengaged and the multi- disk brake B1 is engaged. The shift process is started by the fully integrated transmission control (VGS) control unit (Y3/8n4). In the process multi-disk brake B1 is filled and the pressure in multi-disk brake B1g increased. Simultaneously the pressure in multi-disk brake B3 is reduced.

This involves a flowing transition. If 2nd gear torque is now reached, the engine speed must be adapted to the level of 2nd gear.(magnification phase). This rpm adaptation is achieved so that the pressure in the multi-disk brake B1 is increased and if necessary an engine torque reduction is carried out via the ME control unit (N3/10) or CDI control unit (N3/9).