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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 
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2001 Mercedes-Benz ML320 
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        Page 1251 of 4133
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  
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        Page 1252 of 4133

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 
 
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Fig. 44: Mulitple-Disc Brake, Function 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
 
2001 Mercedes-Benz ML320 
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        Page 1254 of 4133

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 
 
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        Page 1255 of 4133
Fig. 45: Identifying Multi-Plate Clutch Location  
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.    
Multi-Plate Clutch, Location  
  
Three multi-plate clutches, the front  , middle and rear multi-plate clutches K1, K2, and K3, are located in  
the planetary gear sets in   the transmission housing. See  Fig. 45
.  
Multi-Plate Clutch, Task 
 
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        Page 1256 of 4133
 
Produces a non-positive locking connection between two elements of a planetary gear set or between one 
element from each of two planetary gear sets in order to transmit the drive torque. 
Multi-Plate Clutch, Design 
 
A multi-plate clutch 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. 
Multi-Plate Clutch, Function 
 
See MULTI
-PLATE CLUTCH, FUNCTION.  
Multi-Plate Clutch, Function 
 
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