MERCEDES-BENZ ML430 1997 Complete Repair Manual

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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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
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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

2001 Mercedes-Benz ML320
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

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:26 PMPage 86 © 2006 Mitchell Repair Information Company, LLC.

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

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:26 PMPage 87 © 2006 Mitchell Repair Information Company, LLC.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:26 PMPage 88 © 2006 Mitchell Repair Information Company, LLC.

Fig. 46: Multi-Disc Clutch, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation
Front Multiple-Disc Clutch (K1) - If the piston (K1a) on the front multiple-disc clutch (k1) is subjected to oil
pressure, it presses the internal and external discs of the disc set together. See Fig. 46.
The front sun gear (V1) is connected to the front planetary gear carrier (V3) via the external multiple-disc
carrier (K1b) and the internal multiple-disc carrier (k1b) and the internal multiple-disc carrier (K1c). The front
planetary gear set is thus locked and turns as a closed unit.
Center Multiple-Disc Clutch (K2) - If the center multiple-disc clutch (K2) is engaged via the piston (K2a), the
piston compresses the disc set Via the internal multiple-disc carrier (K2b) and the center planetary gear carrier
(M3) on which the internal discs are seated, the front hollow gear (v4) of the front planetary gear set is
connected to the center hollow gear (M4) of the center planetary gear set. The front hollow gear (V4) and the
center hollow gear (M4) move at the same speed as the drive shaft (1).
Rear Multiple-Disc Clutch (K3) - If the rear multiple-disc clutch (K3) is engaged via the piston (K3a), then
this compresses the disc set. The center sun gear (M1) of the center planetary gear set is connected to the rear
sun gear (H1) of the rear planetary gear carrier via the external multiple-disc carrier (K3b) and internal multiple-
disc carrier (K3c). The center sun gear (M1) and the rear sun gear (H1) move at the same speed.
Upshift/Downshift Solenoid Valve, Location/Task/Design/Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Fig. 47: Upshift/Downshift Solenoid Valve, Location/Task/Design/Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Upshift/Downshift Solenoid Valve, Location

In the shell of the electric control unit and pressed against the shift plate with a spring. See Fig. 47
.
Upshift/Downshift Solenoid Valve, Task

The shift solenoid valves (Y3/6y3, Y3/6y4, Y3/6y5) introduce the sequence of upshifts and downshifts in
the shift plate.
Upshift/Downshift Solenoid Valve, Design

See UPSHIFT/DOWNSHIFT SOLENOID VALVE, DESIGN
.
Upshift/Downshift Solenoid Valve, Function

See UPSHIFT/DOWNSHIFT SOLENOID VALVE, FUNCTION
.
Upshift/Downshift Solenoid Valve, Design
Fig. 48: Upshift/Downshift Solenoid Valve, Design
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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