Mercedes C-Class

W203 since 2000 of release

Repair and car operation



Mercedes-Benz
+ Mercedes-Benz Cars of a class C (W-203)
+ Operation manual
+ Routine maintenance
+ Engine
+ cooling and heating Systems
+ Power supply system and release
+ engine Electric equipment
+ Manual transmission
- Automatic transmission
   Specifications
   + the Automated box of gear shifting 716.6
   - Automatic transmission 722.6
      Search of malfunctions - the general information
      Problems of the block of electronic control and operating signals
      Removal and AT installation with the hydrotransformer
      The AT electrohydraulic control unit (AT is established)
      Dismantling and assembly of the electrohydraulic control unit
      Dismantling and assembly of a plate of gear shifting
      Case of transmission and hydrotransformer
      Multidisk brakes В2, В3 and a blocking gear wheel at "Parking"
      Dismantling and assembly of a back hollow shaft with the back coupling of a free wheeling
      Removal and installation of multidisk brake В1 and oil pump
      Dismantling and assembly of the oil pump
      Dismantling and assembly of multidisk brake В1
      Dismantling and assembly of multidisk brake В2
      Dismantling and assembly of a target shaft with the central and back block of planetary gear wheels
      Removal and installation of multidisk couplings К1, К2 and К3
      Dismantling and assembly of coupling К1
      Dismantling and assembly of a leading shaft with coupling К2 and the forward block of planetary gear wheels
      Dismantling and assembly of coupling К3
      The blocking mechanism at "parking"
      Removal and installation of the lever of the selector of gear shifting
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment







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.