Mercedes-Benz ML320. Service manual - part 173

 

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Mercedes-Benz ML320. Service manual - part 173

 

 

Fig. 89: Holding Pressure Shift Valve, Function 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 

Operation - The holding pressure shift valve (28) is engaged by pressure in the shift elements acting on the 
front face and spring. It assigns the working 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 unpressurized. The valve switches over only during the shift phase 
and only at a certain pressure ratio between the overlap pressure (p-U) and the shift pressure (p-S). 

Shift Pressure Shift Valve, Location/Task/Function 

 

2001 Mercedes-Benz ML320 

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

  

me 

 

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 pressure 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 regulating valve, to the disengaging shift actuator. 

 

2001 Mercedes-Benz ML320 

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

  

me 

 

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 

 

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 

 

 

 

 

 

 

 

 

Content   ..  171  172  173  174   ..