Page 1257 of 4133
2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Page 1258 of 4133

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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Page 1259 of 4133
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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Page 1260 of 4133
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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Page 1261 of 4133
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
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Page 1262 of 4133
2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Page 1263 of 4133

Fig. 49: Upshift/Downshift Solenoid Valve, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation - If a shift solenoid valve (Y3/6y3, Y3/6y4, Y3/6y5) is actuated via the ETC control module
(N15/3), it opens and directs the control pressure (p-SV) to the command valve assigned (31). See Fig. 49
.
The respective shift solenoid valve (Y3/6y3, Y3/6y4, Y3/6y5) remains actuated and therefore open until the
shift process is completed. The shift pressure (p-SV) to the command valve is reduced to zero as soon as the
respective shift solenoid valve (Y3/6y3, Y3/6y4, Y3/6y5) is switched de-energized.
Automatic Transmission, Location Of Components, Floor Shift (With Touch Shift)
Fig. 50: Automatic Transmission, Location Of Components, Floor Shift
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Location/Task/Design/Function Of Oil Pump
2001 Mercedes-Benz ML320
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Page 1264 of 4133

Fig. 51: Location/Task/Desi gn/Function Of Oil Pump
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Oil Pump, Location
The oil pump (crescent-type pump) (6) is installed in the torque converter housing behind the torque
converter and is driven by the drive flange of the torque converter. See Fig. 51
.
Oil Pump, Task
To produce the necessary oil pressure for the hydraulic sequences.
Oil Pump, Design
An external gear (6a) which is m ounted eccentrically in the pump housi ng is located on the internal gear
(6b) which is connected to the drive flange (6b). The crescent (6c) drives the external gear (6a).
Oil Pump, Function
When the engine is running oil is delivered through th e suction gallery (6e) along the top and bottom side
of the crescent (6c) to the pr essure chamber (6d) of the housin
g. The meshing of the teeth prevents oil
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