724.0 Transmission parts

K7X400, K7X350, K7A350, K7A240, DCT7G

Transmission general data

Number of gears Transmission Type Drive Torque (Nm) ATF (full capacity) L ATF (change) L ATF type (recommended)
7 DCT FWD 350 7,2 6 236.21

Mercedes in cooperation with Getrag had developed 7-speed DSG (7G-DCT) with a dual clutch by 2012. This transmission is intended for vehicles of А, B, CLA, GLA classes.

Mercedes has taken into account the experience of VAG in this field and equipped its DCT with a wet clutch, which can operate withmore powerful engines. This transmission is equipped with an electric oil pump, which is engaged when a quick start is required or in case of the maximum load.


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Technical issues and repair guidelines

The fluid quality monitoring is the only measure required during the first years of operation of this transmission. After 60-80 thousand kilometers, it is recommended to check the fluid state and change with the filter, if some contamination or smell is detected. Mercedes engineers delicately adjusted the mechanism of gears shifting in this transmission and ATF contamination can significantly change the performance capacity of the dual-clutch mechanism.


Therefore 7-DCT has two fine mesh filters:

1. One filter is positioned In the pan – metal-plastic filter with a felt membrane. It is recommended to replace it and change fluid after 100 thousand kilometers.

2. The second filter is placed outside – the filter-cartridge. It should be replaced yearly or after travelling 30-40 thousand kilometers.

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