Mercedes S-Class W-220

since 1998 release

Repair and operation of the car

Mercedes W220
+ Mercedes-Benz cars of the class S (W220)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling system and heating
+ Power supply system and release
+ Engine electric equipment
- Automatic transmission
   Problems of the block of electronic control and the operating signals
   Search of malfunctions - the general information
   Removal and the 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 of V2, VZ and gear wheel of blocking at "Parking"
   Dismantling and assembly of a back hollow shaft with the back coupling of a free wheeling
   Removal and installation of a multidisk brake B1 and oil pump
   Dismantling and assembly of the oil pump
   Dismantling and assembly of a multidisk brake of B1
   Dismantling and assembly of a multidisk brake of B2
   Dismantling and assembly of an output shaft with the central and back block of planetary gear wheels
   Removal and installation of multidisk couplings K1, K2 and K3
   Dismantling and assembly of coupling of K1
   Dismantling and assembly of the leading shaft with coupling by K2 and the forward block of planetary gear wheels
   Dismantling and assembly of coupling of K3
   The blocking mechanism at "parking"
   Removal and installation of the lever of the selector of gear shifting
+ Power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment


Automatic transmission

General information

Separate characteristics are provided also in the text of the Head and in case of obligation of their performance are highlighted in bold type

Type 5-staged, with electronic control by gear shifting.
(W5A330) 722.617
(W5A330) 722.618
(W5A580) 722.632
S500, S55AMG
(W5A580) 722.633
 (W5A580) 722.649
Transfer relations and involvement of the AT elements

(1) The switch of program switching in situation S
(2) The switch of program switching in situation W
(3) Actuation mechanisms of switching only at the movement by a setup
W5A 580, Main transfer
W5A 330, Main transfer
The applied liquid
S 280, S 320
7.0 l, MB No. 001 989 21 03 10
S 420, S 500, S 600
9.0 l, MB No. 001 989 21 03 10
The codes of diagnostics of system of electronic control by automatic transmission taken by means of the OBD II scanner are described in specifications to the Head Elektrooborudovaniye of the engine.
Efforts of tightening of threaded connections, H • m
Oil stopper of AT
Oil stopper of the AT hydrotransformer
Pallet AT bolts
Lock screw of draft of the AT selector
Bolt of fastening of the hydrotransformer to a drive plate, M8
Drain stopper in the transmission pallet
Nut of fastening of the driveshaft to the transmission, M12
Bolt of fastening of the electromagnetic valve to a gear shifting plate
Bolt of fastening of a cover of the case of valves to the case of valves, M6x30
Bolt of fastening of a side cover to a cover of the case of valves and the case of valves, M4x12
Bolt of fastening of the case of transmission to the hydrotransformer case
Bolt of fastening of the pallet to the transmission case
Nut of fastening of a flange of an output shaft
Bolt of fastening of the electrohydraulic control unit to the transmission case
Bolt of fastening of a multidisk brake of B2 to the transmission case
Bolt of fastening of a doggie to the gear shifting selector lever
Drain stopper of the hydrotransformer

Section of automatic transmission

1 — the Entrance shaft
2 — ECU
3 — the Intermediate shaft
4 — the Blocking gear wheel of the parking
5 — the Output shaft
6 — the Oil pump
7 — Gidrotransformator
8 — a reactor Shaft
9 — the Blocking hydrotransformer coupling
B1 — Multidisk brake assembly of B1

B2 — Multidisk brake assembly of B2
B3 — Multidisk brake assembly of B3
F1 — F1 Flywheel
F2 — F2 Flywheel
N — Back planetary assembly
K1 — Multidisk coupling of K1
K2 — Multidisk coupling of K2
K3 — Multidisk coupling of K3
M — the Central planetary assembly
V \Forward planetary assembly

The scheme of transfer of rotation in position "1" of the AT selector

1 — the Entrance shaft
2 — the Output shaft
16 — the Blocking hydrotransformer coupling
A — the Speed of rotation of a bent shaft
B — Transmission, rotation speed on an entrance
With — the Relation of the 1st transfer
D — the Relation of the 2nd transfer
E — the Relation of the 3rd transfer

F — the Fixed parts
H — a Back set of planetary transfer
L — the Stator
M — the Central set of planetary transfer
P — Krylchatka
T — a turbine Wheel
V \Forward set of planetary transfer

Control unit of automatic transmission

K38 — the Module of the relay of blocking of a starter
N2/2 — the Module of management of SRS
N15/1 — the Module of management of 5-staged AT (TCM)

N15/3 — the Module of management of transmission (TCM)
N54 — the Module of management of RCL

Arrangement of the module of management of automatic transmission

Automatic transmission, in the course of start-off from the place, performs function of ordinary coupling, and during the 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 implementation of coupling at start-off from the place and gear shifting.

The principles and schemes of construction and functioning of AT are in detail considered in the management "Automatic transmissions of modern cars" of ARUS publishing house.

The control system of transmission (known as system of electronic synchronous switching) is a component of the modified control system of the engine. The control system can work in the special safe mode into which passes at detection of any malfunction. At the same time 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 the safe mode on the control panel the control lamp lights up (address the Head the Operation manual). Analyzing information arriving from various sensors (not only the sensors directly related to transmission), the control system chooses optimum from the point of view of profitability, smoothness of the course, etc. a box operating mode. At a certain position of the gate of a throttle the control system can block the hydrotransformer in such a way that only the fourth and fifth transfers will join. It reaches considerable decrease in consumption of fuel.

The only regular procedure of service of a box is check of level of working liquid (address the Section Check of Level of Oil of Automatic Transmission). Regularly it is not necessary to change transmission liquid.

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

There is no traditional switch of the Kick-Down mode. Inclusion of this mode is carried out directly by a control system of transmission after the information processing arriving from the sensor of provision of a butterfly valve.

There are several 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 the Head the Operation manual).

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