Mercedes-Benz ML320. Service manual - part 155

Fig. 42: Command Valve, Function 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 

Operation  

When the end face is unpressurized (stationary phase), the working pressure is directed to the actuated shift 
element. If the end face of the command valve (31) is subjected 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 TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

  

me 

 

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 

 

2001 Mercedes-Benz ML320 

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

  

me 

 

Fig. 44: Mulitple-Disc Brake, Function 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

 

2001 Mercedes-Benz ML320 

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

  

me 

 

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 

 

2001 Mercedes-Benz ML320 

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

  

me