Mercedes-Benz ML320. Service manual - part 180

 

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Mercedes-Benz ML320. Service manual - part 180

 

 

 

2001 Mercedes-Benz ML320 

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

  

me 

 

Fig. 106: Torque Converter Lockup Clutch, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
 

Operation  

When actuated by the ETC control module (N15/3), oil pressure controlled by the torque converter lockup 
PWM solenoid Valve (Y3/6y6) is directed through the input shaft (1) to the pressure chamber behind the piston 
(16d). See 

Fig. 106

. The piston presses the clutch pack (16c) together and allows torque to be transferred 

directly between the impeller (P) and turbine wheel (T). The torque converter lockup clutch is activated in 5th, 
4th and 3rd gears in relation to the engine speed and engine load. 

AUTOMATIC TRANSMISSION, FUNCTION 

Transmission without touch shift. 722.6 in MODEL 163, 170, 202, 208, 210. 

Transmission 722.6 in MODEL 129, 140. 

Automatic transmission 722.6 is an electronically controlled 5-speed transmission with a lockup clutch in the 
torque converter. 

The ratios for the gear stages are achieved by three planetary gear sets. The 5th gear is designed with a step-up 
ratio as an overdrive. 

Shifting is initiated electronically. The gears are shifted by the corresponding combination of three 
hydraulically actuated multi-plate brakes, three hydraulically actuated multi-disc clutches and two mechanical 
freewheels. 

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 

 

2001 Mercedes-Benz ML320 

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

  

me 

 

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. 

Automatic Transmission, Location Of Mechanical Components 
 
See AUTOMATIC TRANSMISSION, LOCATION OF MECHANICAL PARTS

Automatic Transmission, Location Of Electrical/Electronic Components 
 
See AUTOMATIC TRANSMISSION, LOCATION OF ELECTRIC/ELECTRONIC 
COMPONENTS

Automatic Transmission, Location Of Hydraulic Components 
 
See AUTOMATIC TRANSMISSION, POSITION OF HYDRAULIC COMPONENTS

Automatic Transmission, Location of Components, Floor Shift 
 
See AUTOMATIC TRANSMISSION, LOCATION OF COMPONENTS, FLOOR SHIFT

Automatic Transmission, Selector Lever Positions 
 

 

2001 Mercedes-Benz ML320 

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

  

me 

 

See AUTOMATIC TRANSMISSION, SELECTOR LEVER POSITIONS

Automatic Transmission, Gear Ratios 
 
See AUTOMATIC TRANSMISSION, GEAR RATIOS

Power Transmission, Function 
 
See POWER TRANSMISSION, FUNCTION

Gearshift System, Function 
 
See FUNCTION OF GEAR SHIFT

Hydropneumatic Transmission Control, Function 
 
See HYDROPNEUMATIC TRANSMISSION CONTROL, FUNCTION

Shift-Lock, Function 
 
See SHIFT-LOCK FUNCTION.  

Automatic Transmission, Location of Components, Floor Shift (Without Touch Shift) 

 

2001 Mercedes-Benz ML320 

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

  

me 

 

 

 

 

 

 

 

 

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