Mercedes-Benz 725.0

Transmission general data

The 9-speed automatic transmission 9G-Tronic (725.0) was developed by the company Mercedes-Benz and was released in 2013, replacing the model 7G-Tronic.

When developing this gearbox, Mercedes-Benz’s transmission specialists concentrated on simplifying the structure of the transmission, while maintaining its size and implementing the solution with 9 gears, minimum number of planetary gear sets and mechanisms of gear shifting. As a result of intensive computer system analysis and synthesis, transmission engineers solved this problem by means of only 4 planetary gear sets and 6 gear shifting mechanisms.

Since 2014, the 9G-Tronic transmission has been installed on cars of E-(including coupe/cabriolet) and CLS Classes, since 2015 – on GLC, GLE (including coupe), and GLS Classes. The 9G-Tronic is considered to be the world’s first 9-speed automatic gearbox in the segment of premium cars. The performance efficiency of this amounts to incredible 92% (this parameter of 7G-Tronic was equal to 85%). The span of gear ratios is equal to 9.15.

Despite two additional gears and the maximum torque up to 1000 Nm, 9G-Tronic requires the same amount of space for positioning as its predecessor. Three speed sensors monitor the operation of the gearbox and provide the TCU with relevant information for efficient gear shifting. Three different modes of operation allow the driver to pre-select an appropriate algorithm of gear shifting. It improves driving comfort and reduces the noise level.

The 9G-Tronic transmission has 3 driving modes:

«Comfort» («C») — for driving with low fuel consumption;

«Sport» («S») — for fast driving style at high engine RPM;

«Manual» («M») — for fast driving and manual gear shifting via the system DIRECT SELECT.

According to representatives of Mercedes-Benz, this transmission is suitable for cars with rear and all-wheel drive, as well as for hybrids and E-motors.

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