Spare parts catalog for Mercedes-Benz Transmissions where you can be sure to find every part you need. This online catalogue contains spare parts to all the Mercedes-Benz Transmissions models divided according to the model groups. Just open the catalogue, choose the needed part and find the complete information about it.
Being a successful premium German automaker, Daimler offered convenient solutions for its vehicles, including transmissions. It is believed that the first Mercedes-Benz with “automatic gear changes” was the “Big Mercedes” 770 (W07), which was produced in the years 1930-1943. He had a 3-speed manual transmission, and since 1938, 4-speed with overdrive (overdrive). Overdrive literally translates as overdrive. Consider an additional two-stage box with an increased range of gears. On the 770, the overdrive was activated with a lever that activates its vacuum-hydraulic drive.
Other serial automatic transmission solutions on Mercedes-Benz models appeared in the 1950s. Here it is worth mentioning the Mercedes-Benz 300C, which, after restyling in 1955, received a 3-step hydromechanical "automatic" Borg-Warner DG 150M. In 1957, the Hydrak transmission was optionally available on models 220 S and 219 (type W180). It was a 4-speed manual transmission. The clutch of such a manual transmission was supplemented by an electric servo drive manufactured by Fichtel & Sachs and a hydraulic clutch produced by Daimler. There was no clutch pedal on the cars with Hydrak, and to shift gears, it was necessary to use a lever mounted on the steering column, with the “gas” released.
The first hydromechanical “automatic” of its own production was the box with the designation 722.2. It debuted in 1961 on the model W111 220 SEB and on the W111 300 SE. This box was 4-speed, but instead of the usual torque converter it was equipped with a hydraulic clutch. This box was released right up to 1983. In 1967, its version with a torque converter appeared, it was designated with the index 722.1. This box was placed on both the W116 and the W123 and other models, and it was produced until 1983. In 1964, a specially reinforced 4-speed hydromechanical transmission was created specifically for the 6-seater Mercedes-Benz 600, in which the number of planetary mechanisms was increased from three to six. In 1970, a special box appeared to work in tandem with the V8 engines. It had an index of 722.0, but it only got 3 gears. The special enhanced version 722.003 was created in 1975 to work with the 6.8-liter engine of the model 450 SEL 6.9. This box is still considered the most unkillable one among all hydro-mechanical transmissions.
The automatic machines of the 722.0 - 722.2 series in 1981 began to replace the more progressive four-stage with the factory designation 722.3. In general, the gearbox 722.3 has found very wide application in the passenger cars of the concern Mercedes-Benz. So, this "automatic" received all versions of the model W124, except for the car, equipped with a 3.2-liter gasoline injection engine.
Naturally, in those years, the W126 executive class sedan was also equipped with the 722.3 transmission (including its “hot” versions with the flagship 5.6-liter V8 petrol engine - 560SEC and 560SEL). The Avtomat 722.3 received all versions of the Mercedes-Benz S-Class W140, which replaced the legendary W126 in 1990. The exception is the stock gasoline 3.0-liter and 3.2-liter units (300SE / 300SEL and 320SE / 320SEL, respectively).
The reliability of the 722.3 is also indicated by the fact that until 1993 these transmissions were also installed by Mercedes’s first SUV, the Geländewagen (G-class) W 460 / W461.
In 1983, in parallel with the 722.3 gearbox, the production of the 722.4 was launched, which was constructively a reduced copy of the 722.3 gearbox. This automatic transmission was specially developed for the model "190" (body W201), well known by the nickname "Baby-Benz".
The first five-speed automatic transmission for Mercedes-Benz cars was introduced in a distant 1989. The unit with a factory index of 722.5 received an E-class W124 with a 3.2-liter gasoline engine and a S-class W140 with 3.0-liter and 3.2-liter gasoline engines.
A real leap in the evolution of automatic hydromechanical transmissions of Mercedes happened in 1996, when a fundamentally new conceptual five-speed automatic transmission 722.6 was revealed to the world, which received its own designation “Steptronic”. For the Daimler concern, this transmission became the first passenger “automatic” equipped with an electronic / electro-hydraulic locking system for the torque converter and directly by the gearshift process.
Automatic 722.6 became the main automatic transmission for passenger models of Mercedes, produced from 1996 to 2003. So, this “automatic” was installed on the S-Class W140 before the model was changed in 1998; on the E-class W210 - until 2002 (end of release), on the C-class W202 - until 2000
Up until the debut in 2003, the new seven-speed transmission “7G-Tronic, the E-class W211, C-class W203, and S-class W220 were equipped with a box 722.6. In addition, this gearbox was installed both on the mid-size SUV M-class W163, produced in the USA, and on the new generation SUV G-class and W463.
722.3 and 722.5 - reliability with an eye on infinity
No modern hydromechanical transmissions can compete with the resource and reliability of the 722.3 units developed in the 80s of the last century! Maybe the fact is that these, structurally not the most complex, automatic transmissions, due to their "antiquity", lack capricious electro-hydraulic valves and control electronics. Or it may be that they are designed “conscientiously”, taking into account the estimated service life of the car for at least 20 years. In general, with careful operation and the condition of compliance with the maintenance regulations, the 722.3 geatboxes were reliable enough and able to work for decades, withstanding about 1 million km before complete overhaul!
The causes of breakdowns of the four-stage Mercedes-Benz automatic transmission with purely hydraulic control are improper operation and failure to comply with the transmission fluid replacement intervals, which, according to the factory operating instructions must be replaced with a filter every 60 thousand kilometers. The original ATF Mercedes for all automatic transmissions 722, except for the “Series 6” has already been discontinued. As its substitute for boxes 722.3 and 722.4, it is possible to use ATF Dextron-III.TO BE CONTINUED...