MERCEDES-BENZ ML430 1997 Complete Repair Manual

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

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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

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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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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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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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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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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.

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

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Fig. 93: Float, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Function - With low oil levels, the lubrication oil which flows constantly out of the gearset, flows back to the
oil gallery (A) through the opening (46). If the oil level rises, the oil presses the float (45) against the housing.
See Fig. 93
.
The float (45) therefore separate the oil gallery (A) from the gearset chamber (B). The lubricating oil which
continues to flow out of the gearsets is thrown against the housing wall, incorporated by the rotating parts and
flows back into the oil
gallery (A) through the upper opening (arrow).

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ETC Control Unit, Location/Task
Fig. 94: ETC Control Unit, Location/Task
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
ETC Control Unit, Location

See ETC CONTROL UNIT, LOCATION
.
ETC Control Unit, Task

See ETC CONTROL UNIT, TASK (EXCEPT CODE (428A) STEERING WHEEL SWITCH
BUTTONS).
ETC Control Unit, Location

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