Mercedes-Benz ML320. Manual — part 210

Basically automatic transmission 722.6 with electronic control offers the following advantages:



Reduced Fuel Consumption



Improved Shift Comfort



More Favorable Gear Steps As A Result Of 5 Gears



Enhanced Life And Reliability



Reduced Servicing Costs

The electrohydraulic control unit is bolted onto the bottom of the transmission housing. The end of the
transmission is formed by an oil pan made of sheet steel.

The oil pressure for the converter lockup clutch and center multiple-disc clutch is supplied via holes in the input
shaft. The oil pressure to the rear multiple-disc clutch is routed through the output shaft. The lubricating oil is
supplied and distributed by additional bore holes in both shafts. All bearing points of the gear sets as well as
freewheels and shift elements are supplied with lubricating oil.

The parking lock gear and drive flange are connected to the output shaft by gearing.

Freewheels F1 and F2 optimize shifting. The front freewheel (F1) rests against the stator shaft extension on the
transmission side and connects the sun gear of the front planetary gear set to the transmission housing in the
locking direction.

The torque converter housing and transmission housing are made of a metal alloy. They are bolted together and
centered via the outer multiple-disc carrier of the multiple-disc brake B1. A coated intermediate panel seals the
two components.

The oil pump and outer multiple-disc carrier of the front multiple-disc brake are bolted to the converter housing.

The mechanical part consists of the propeller shaft, output shaft, a sun gear shaft and three planetary gearsets
which are coupled together.

In transmissions for powerful engines, the planetary gearsets have 4 planetary gears, while for less powerful
engines the front and rear planetary gear system has three planetary gear wheels. The stator shaft is pressed into
this and is secured against turning by a spline.

The rear freewheel F2 connects the sun gear of the center planetary gear set to the sun gear of the rear planetary
gearset in the locking direction.

The electrohydraulic control unit consists of the shift plate made of light alloy for hydraulic control and an
electronic control unit.

The electrical control unit consists of a supporting body made of plastic in which the electrical components are
combined. The shell is screwed to the shift plate. Conductor tracks which are integrated into the shell, connect
the electric components to a plug connector. This 13-pin plug connector forms the connection with the vehicle-
side wiring harness and with the ETC 5 (electronic transmission control) control module (N15/5) via a bayonet
lock.

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me

SURVEY OF SYSTEM COMPONENTS, AUTOMATIC TRANSMISSION (AT), LOCATION, TASK, DESIGN

Function Of Gear Change

See FUNCTION OF GEAR CHANGE.

Shifting N to D (1st Gear), Function

See SHIFTING N TO D (1ST GEAR), FUNCTION.

Shift From 1 to 2, Function

See SHIFT FROM 1 TO 2, FUNCTION.

Limp-Home Mode, function

See LIMP-HOME MODE, FUNCTION.

Operating Pressure, Function

See OPERATING PRESSURE, FUNCTION.

Lubricating Pressure, Function

See LUBRICATING PRESSURE, FUNCTION.

Shift Pressure, Function

See SHIFT PRESSURE, FUNCTION.

Modulating Pressure, Function

See MODULATING PRESSURE, FUNCTION.

Regulating Valve Pressure, Function

See REGULATING VALVE PRESSURE, FUNCTION.

Shift Valve Pressure, Function

See SHIFT VALVE PRESSURE, FUNCTION.

Manual Drive Mode Selection, Function

See MANUAL DRIVE MODE SELECTION, FUNCTION.

Oil Level Control, Function

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me

See OIL LEVEL CONTROL, FUNCTION.

Function of Torque Converter Lockup Clutch Control

See FUNCTION OF TORQUE CONVERTER LOCKUP CLUTCH CONTROL.

Torque Converter Lockup Clutch Control Pressure, Function

See TORQUE CONVERTER LOCKUP CLUTCH CONTROL PRESSURE, FUNCTION.

Function Of Locking Of Selector Lever Position "P"

See FUNCTION OF LOCKING OF SELECTOR LEVER POSITION "P".

Ignition Lock Locking, Function

See IGNITION LOCK INTERLOCK.

Function Of Shift Lock Override

See FUNCTION OF SHIFT LOCK OVERRIDE.

Survey Of System Components, Automatic Transmission, Location/Task/Design/Function

See SURVEY OF SYSTEM COMPONENTS, AUTOMATIC TRANSMISSION,
LOCATION/TASK/DESIGN/FUNCTION.

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me

Fig. 169: Location Of Mechanical Parts
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me