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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
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
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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
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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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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1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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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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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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