Mercedes-Benz
Source-verified model
Mercedes-Benz 724.0
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.
Speeds
7
Type
DCT
Drive
FWD
Max torque
350
ATF capacity (L)
7,2
ATF change (L)
6
ATF type
236.21
Other and alternative codes of this transmission
M246
K 7 X 400
724 0
K7X400
724.0
K7A240
7240
724-0
K 7 A 240
verified naming
OEM designation
source name
Common problems & symptoms
Problems and symptoms reported for this transmission, compiled from repair sources. Not a complete list.
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ATF Contamination Dual Clutch
ATF contamination significantly alters dual-clutch mechanism performance capacity due to finely adjusted shifting mechan
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ATF Smell or Contamination
Detected ATF odor or visible contamination indicates fluid degradation requiring immediate fluid and filter change.
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Electric Oil Pump Failure
Electric oil pump engaged during quick starts or maximum load; failure risks pressure loss under high-demand conditions.
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Pan Filter Clogging
Metal-plastic filter with felt membrane in pan requires replacement to prevent flow restriction and clutch degradation.
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External Cartridge Filter Blockage
External filter-cartridge positioned outside transmission requires frequent replacement to maintain clean ATF supply.
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Gear Shifting Performance Degradation
Degraded ATF quality causes noticeable changes in gear shift quality due to sensitivity of 7G-DCT shifting mechanism.
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About this transmission
Transmission general data
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.
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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