GF27.60-P-4014N Shifting N to D (1st Gear), Function

GF27.60-P-4014N Shifting N to D (1st Gear), 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

Multi-disk brake B3 and multi-disk clutch K3 are engaged in selector lever position "N". By shifting from selector lever position "N" to selector lever position "D" the supply to multi-disk brake B2 is released by the selector valve. The fully integrated transmission control (VGS) control unit (Y3/8n4) actuates the brake control solenoid valveB2 (VGS) (Y3/8y6) and multi-disk brake B2 is filled with transmission oil. Due to the rpm difference (actual slip) between engine speed and turbine speed the fully integrated transmission control (VGS) control unit (Y3/8n4) detects whether the multi-disk brake B2 is full. The brake control solenoid valve B2 (VGS) (Y3/8y6) actuates the regulating valve B2/BR, which converts the adjacent working pressure into shift pressure and passes it on to the multi-disk brake B2.

The slip required (nominal slip) for the respective gear is stored in the fully integrated transmission control (VGS) control unit (Y3/8n4). Depending on this, the control pressure on the regulating valve BR is changed via the brake control solenoid valve B2 (VGS) (Y3/8y6)B2/. The shift pressure produced by the regulating valve
B2/BR depends on the geometry of the regulating valve B2/BR.
The pressure in the multi-disk brake B2 in changed until the nominal slip stored in the fully integrated transmission control (VGS) control unit (Y3/8n4) is reached.