Mercedes C-Class

W203 since 2000 of release

Repair and car operation

Automatic transmission 722.6

General information

Cut of automatic transmission


1 — the Entrance shaft 2 — ECU 3 — the Intermediate shaft 4 — the Blocking gear wheel of a parking 5 — the Target shaft 6 — the Oil pump 7 — Gidrotransformator 8 — a reactor Shaft 9 — the Blocking coupling of the hydrotransformer В1 — Multidisk brake assembly В1 В2 — Multidisk brake assembly В2 В3 — Multidisk brake assembly В3	F1 — F1 Flywheel F2 — F2 Flywheel N — Back planetary assembly К1 — Multidisk coupling К1 К2 — Multidisk coupling К2 К3 — Multidisk coupling К3 M — the Central planetary assembly V\Forward planetary assembly

Automatic transmission, in the course of a troganiye from a place, carries out function of ordinary coupling, and during movement performs work on gear shifting.

The AT main hubs are: torque converter, planetary reducer and hydraulic or electronic control system. Hydrodriving disk brakes and disk coupling are applied to transition to another transfer the relation in a planetary reducer.

The torque converter on the functions corresponds to hydraulic coupling. Its task includes coupling implementation at a troganiye from a place and gear shifting.

The control system of transmission (known as system of electronic synchronous switching) is the component of the modified control system of the engine established only on model with automatic transmission. The control system can work in a special safe mode to which passes at detection of any malfunction. Thus operating modes of transmission are limited, and the car can be delivered under the own steam to repair shop. Upon transition of a control system to a safe mode on a control panel the control lamp (address to Head the Operation manual) lights up. Analyzing information arriving from various sensors (not only the sensors which are directly related to transmission), the control system chooses optimum from the point of view of profitability, smoothness of a course etc. a box operating mode. At the certain provision of a zaslonka of a throttle the control system can block the hydrotransformer in such a manner that the fourth and fifth transfers will join only. It reaches considerable decrease in consumption of fuel.
The unique regular procedure of service of a box is check of level of working liquid (address to the Section Check of level of oil of automatic transmission). Regularly to change transmission liquid it is not necessary.

Near a radiator of system of cooling the cooler of transmission liquid is established.

The traditional switch of the Kick-Down mode is not present. Inclusion of this mode is carried out directly by a control system of transmission after processing of information arriving from the sensor of provision of a butterfly valve.

There are some operating modes of transmission, each of which can be involved after moving of the selector to one of the following provisions: P, R, N, D, 1, 2, 3, 4 (address to Head the Operation manual).

The engine can be started only if the selector is in situation P or N. It is made to prevent car movement in start attempt (if the selector is established in one of other provisions). Analyzing information arriving from sensors, the control system resolves or forbids engine start. The locations of various relays are specified in Head Onboard electric equipment.