1997 MERCEDES-BENZ ML320 automatic transmission

See SHIFT DETENT, DESIGN
.
Shift Detent, Function

See SHIFT DETENT, FUNCTION
.
Shift Detent, Design
Fig. 86: Shift Detent, Design
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Structure - The shift detent consists of:
The Locking Disc (69) Rigidly Connected To The Selector Lever (80). See Fig. 86
The Cam With Recess (69D)
A Leaf Spring (85) Bolted Onto The Body (81)
A Metal Roller (84) Inserted Into The Leaf Spring (85)
Shift Detent, Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:27 PMPage 150 © 2006 Mitchell Repair Information Company, LLC.

Fig. 87: Shift Detent, 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 3:15:27 PMPage 151 © 2006 Mitchell Repair Information Company, LLC.

Operation - When the selector lever (80) is moved away fr om position "N" to position "D", the roller (84)
locks in position engages in the recess (69d) in the locking disc via the cam (69). See Fig. 87
. The selector lever
(80) is locked to prevent longitudinal movement. Now it can only be shifted out of selector lever position "D"
against the force of the leaf spring (85) . It is still possible to move the selector lever ( 80) sideways (touch shift
in the "+" and "-" direction).
Holding Pressure Shift Valve, Location/Task/Function
Fig. 88: Holding Pressure Shift Valve, Location/Task/Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Holding Pressure Shift Valve, Location

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:27 PMPage 152 © 2006 Mitchell Repair Information Company, LLC.

Each shift group is assigned a holding pressure shift valve (28a, 28b, 28c). See Fig. 88
. The holding
pressure shift valves 1-2/4-5 (28a) and 2-3 (28b) are installed in the valve housing (2b), the 3-4 holding
pressure shift valve (28c) is installed in the valve housing of the shift plate (2a).
Holding Pressure Shift Valve, Task

Allocates the working pressure to one actuator of a shift group.
Holding Pressure Shift Valve, Function

See HOLDING PRESSURE SHIFT VALVE, FUNCTION
.
Holding Pressure Shift Valve, Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:27 PMPage 153 © 2006 Mitchell Repair Information Company, LLC.

Fig. 89: Holding Pressure Shift Valve, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation - The holding pressure shift valve (28) is engage d by pressure in the shift elements acting on the
front face and spring. It assigns the work ing pressure (p-A) to the shift element with the higher pressure (taking
into account the spring force and the effective area). See Fig. 89
.
The other element of the shift group is then unpressuri zed. The valve switches over only during the shift phase
and only at a certain pressure ratio between the overl ap pressure (p-U) and the shift pressure (p-S).
Shift Pressure Shift Valve, Location/Task/Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:27 PMPage 154 © 2006 Mitchell Repair Information Company, LLC.

Fig. 90: Shift Pressure Shift Valve, Location/Task/Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Shift Pressure Shift Valve, Location

Each shift group possesses one shift pr essure shift valve. The 1-2/4-5 shift pressure shift valves (29a) and
2-3 shift pressure shift valve (29b) are installed in the valve housing of the shift plate (2b), the 3-4 shift
pressure shift valve (29c) is installed in the valve housing of the shift plate (2a). See Fig. 90
.
Shift Pressure Shift Valve, Task

To assign shift pressure to the engaging shift actuator and to assign the overlap pressure, controlled by the
overlap re
gulating valve, to the disengaging shift actuator.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:27 PMPage 155 © 2006 Mitchell Repair Information Company, LLC.

Shift Pressure Shift Valve, Function

See SHIFT PRESSURE SHIFT VALVE, FUNCTION
.
Shift Pressure Shift Valve, Function
Fig. 91: Shift Pressure Shift Valve, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation - When the multiple-disc brake (B) is engaged, the working pressure (p-A) is applied to the end face
of the shift valve (29) via the command valve (31). See Fig. 91
. Its shift condition is retained in the shift phase,

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:27 PMPage 156 © 2006 Mitchell Repair Information Company, LLC.

whilst the shift element pressure acting on the end face and which is variable during the shift phase is replaced
by a corresponding, constant pressure.
When the multiple-disc clutch (K) is engaged (K) the end face of the shift pressure shift valve (29) is
depressurized during the stationary and shift phases, here the shift condition is also retained during the shift
phase.
Shift Pressure Regulating Valve, Location/Task/Function Also Float, Location/Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:27 PMPage 157 © 2006 Mitchell Repair Information Company, LLC.