General information about automatic transmission (Mercedes-Benz E-Class W124)

Mercedes-Benz vehicles are equipped with 4- or 5-speed automatic transmissions.

The automatic transmission consists of a torque converter, an epicyclic gear train, and a hydraulically driven clutch and brakes.

Torque from the engine is transmitted to the transmission through a torque converter, which functions as a fluid clutch and acts as an automatic clutch, also providing torque transmission during acceleration.

The epicyclic gear train provides forward movement in one of four or five gears or reverse movement. The components of the gear train are controlled by brakes and clutches, which are actuated hydraulically. A pump located in the gearbox provides the necessary hydraulic pressure for the operation of the brakes and clutch.

The gearbox is controlled by a selector lever and two switches. Position D provides automatic selection of one of four or five gears. The automatic mechanism for forced downshifting KICK DOWN forcibly changes gear to a lower gear if the accelerator pedal is pressed to the stop. This mode should be used when maximum acceleration of the car is required. If the selector lever is in position 3, the car will move only in the first three gears, and in position 2 - only in the first two gears, etc. Setting lower gears is desirable for engine braking, when driving downhill or to prevent unwanted selection of a higher gear on winding roads.

Using additional switches, you can set two driving modes: economical (E) or standard (S).

(Material created based on the website: «Mercedesman.ru»)

Due to the complexity of the automatic transmission, any repairs must be carried out at a service station.