1997 MERCEDES-BENZ ML320 automatic transmission

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
me
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
me
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
me
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
me
Saturday, October 02, 2010 3:15:26 PMPage 89 © 2006 Mitchell Repair Information Company, LLC.

Fig. 47: Upshift/Downshift Solenoid Valve, Location/Task/Design/Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 90 © 2006 Mitchell Repair Information Company, LLC.

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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Saturday, October 02, 2010 3:15:26 PMPage 91 © 2006 Mitchell Repair Information Company, LLC.

Structure - The shift solenoid valves (Y3/6y3, Y3/6y4, Y3/6y5) are sealed to the valve housing of the shift
plate (2a) by two O-rings (34, 35) (2a). See Fig. 48.
The contact springs (32) on the shift solenoid valves (Y3/6y3, Y3/6y4, Y3/6y5) engages in a slot in the
conductor tracks (33). The force of the contact spring (32) ensures safe contacts.
Upshift/Downshift Solenoid Valve, Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 92 © 2006 Mitchell Repair Information Company, LLC.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 93 © 2006 Mitchell Repair Information Company, LLC.