1997 MERCEDES-BENZ ML320 automatic transmission

Transmission Housing Breather, Location

The inside of the transmission and the breather (72) are connected by a channel which is cast into the
torque converter casing. See Fig. 39
.
Transmission Housing Breather, Task

The transmission housing vent compensated the pressure in the transmission housing if temperature-
related volume changes in the transmission oil and air occur.
Kick-Down Switch, Location/Task/Design
Fig. 40: Kickdown Switch, Location/Task/Design
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Kick-Down Switch, Position


2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 78 © 2006 Mitchell Repair Information Company, LLC.

The kickdown switch (S16/6) is located in the footwell, integrated into the electric accelerator pedal. See
Fig. 40
.
Kick-Down Switch, Task

Influencing the shift program of th e electronic transmission control.
Kick-Down Switch, Design

The kickdown switch (S16/6) cons ists of a spring-tensioned electrical switch contact.
Location/Task/Function Of Command Valve

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 79 © 2006 Mitchell Repair Information Company, LLC.

Fig. 41: Location/Task/Function of Command Valve
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Command Valve, Location

Each shift group possesses one command valve. The 1-2/4-5 command valves (31a) and 2-3 (31b) are
installed in the valve housing of the shift plate (2b), the 3-4 command valve (31c) is installed in the valve
housing of the shift plate (2a). See Fig. 41
.
Command Valve, Task

The command valves switch the shift groups from the stationary phase into the shift phase and back
again.
Command Valve, Function

See LOCATION/TASK/FUNCTION OF COMMAND VALVE
.
Command Valve, Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 80 © 2006 Mitchell Repair Information Company, LLC.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 81 © 2006 Mitchell Repair Information Company, LLC.

Fig. 42: Command Valve, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation
When the end face is unpressurized (stationary phase), th e working pressure is directed to the actuated shift
element. If the end face of the command valve (31) is subj ected to shift valve pressure (p-SV) (shift phase), then
the shift pressure (p-S) is switched to the engaging element and the overlap pressure (p-U) is switched tot he
disengaging element. See Fig. 42
.
Multiple-Disc Brake, Location/Task/Design/Function
Fig. 43: Multiple-Disc Brake

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 82 © 2006 Mitchell Repair Information Company, LLC.

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Multiple-Disc Brake, Location

Three multiple-disc brakes arranged as the front, center and rear multiple-disc brake (B1, B3, B2) are
located in the planetary gear sets in the transmission housing. See Fig. 43
.
Multiple-Disc Brake, Task

Brace the ring gear, sun gear or planet carrier of a planetary gear set against the transmission housing in
order to transmit the drive torque.
Multiple-Disc Brake, Design

A multiple-disc brake consists of a number of internally toothed discs (10) on an internally toothed disc
carrier and externally toothed discs (9) on an externally toothed disc carrier, which is rigidly connected to
the transmission housing.
Multiple-Disc Brake, Function

See MULTIPLE
-DISC BRAKE, FUNCTION.
Multiple-Disc Brake, Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 83 © 2006 Mitchell Repair Information Company, LLC.

Fig. 44: Mulitple-Disc Brake, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 84 © 2006 Mitchell Repair Information Company, LLC.

Operation
If the piston (B1a) on multiple-disc brake B1 is subjected to oil pressure, it presses the internal and external
discs of the disc set together. See Fig. 44
. The front sun gear (v1) on the housing is locked via the internal
multiple-disc carrier (B1c). the front planetary gears (V2) roll on the front sun gear (V1).
If the rear multiple-disc brake (B2) is engaged via the piston (B2a), then this presses the disc set together. The
center sun gear (M1) is locked against the housing via the internal multiple-disc carrier (B2c). The center
planetary gears (m2) roll on the center sun gear (M1).
If the center multiple disc brake (B3) is engaged via the piston (B3a), then the rear planetary gear carrier (H3)
and the center hollow gear (M4) are locked. When the center multiple-disc brake (B3) is engaged the direction
of rotation reverses.
Multi-Plate Clutch, Location/Task/Design/Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 85 © 2006 Mitchell Repair Information Company, LLC.