Page 1321 of 4133
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
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Page 1322 of 4133
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
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Saturday, October 02, 2010 3:15:27 PMPage 153 © 2006 Mitchell Repair Information Company, LLC.
Page 1323 of 4133
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
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Saturday, October 02, 2010 3:15:27 PMPage 154 © 2006 Mitchell Repair Information Company, LLC.
Page 1324 of 4133
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
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Saturday, October 02, 2010 3:15:27 PMPage 155 © 2006 Mitchell Repair Information Company, LLC.
Page 1325 of 4133
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
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Saturday, October 02, 2010 3:15:27 PMPage 156 © 2006 Mitchell Repair Information Company, LLC.
Page 1326 of 4133
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
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Saturday, October 02, 2010 3:15:27 PMPage 157 © 2006 Mitchell Repair Information Company, LLC.
Page 1327 of 4133
2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:27 PMPage 158 © 2006 Mitchell Repair Information Company, LLC.
Page 1328 of 4133
Fig. 92: Shift Pressure Regulating Valve, Location/Task/Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Float, Location
In the electrical control unit (Y3/6). See Fig. 92
.
Float, Function
See FLOAT, FUNCTION
.
Float, Function
2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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