Automatic transmission (AT), features - GF27.10-P-0001-14N

Transmission 722.9 in model 171.4, 203, 209, 211, 215, 219, 220, 230, 463.303/340/341 

The following features differentiate transmission 722.9 from transmission 722.6:

• The transmission features 7 forward gears and 2 reverse gears.
• A Ravigneaux gear set and 2 single planetary gear systems are used and thus other ratios are achieved.
• The fully integrated transmission control (VGS) control unit (Y3/8n4) is located in the electric controller unit (VGS) (Y3/8). The transmission oil is therefore continuously flushed around the outside of the control unit which ensures the control unit is cooled.
• The transmission oil temperature is recorded by the transmission oil temperature sensor (Y3/8n4) installed in the fully integrated transmission control (VGS) control unit (Y3/8s2).
• The interfaces to the wiring loom have been reduced by the new position of the fully integrated transmission control (VGS) control unit (Y3/8n4).
• Transmission 722.9 is therefore available as a compact assembly unit.
• A torque converter lockup clutch with torsional dampers, which is slip-controlled in all 7 forward gears, is used.
• The disks used on the multidisk clutches and 2 multidisk brakes are single-sided disks. The friction lining is only applied to one side on this version.
• 3 sensors are fitted for recording RPM. This increases ease of shifting and reduces the reaction time during the shift operations.
• It is possible to update (flashing) the control unit software in transmission 722.9 as and when required. This flash-updating is carried out using STAR DIAGNOSIS.