1997 MERCEDES-BENZ ML320 automatic transmission

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
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 94 © 2006 Mitchell Repair Information Company, LLC.

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

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 95 © 2006 Mitchell Repair Information Company, LLC.

from flowing from the pressure side to the suction side.
Park Pawl, Location/Task/Design/Function
Fig. 52: Park Pawl, Location/Task/Design/Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Park Pawl, Location

The park pawl gear (4) and park pawl mechanism (4a) are located in the rear part of the transmission
housing. See Fig. 52
.
Park Pawl, Task

Secures the vehicle mechanically to prevent it from rolling in addition to the parking brake.
Park Pawl, Design

See PARK PAWL, DESIGN
.
Park Pawl, Function

See PARK PAWL, FUNCTION
.
Park Pawl, Design

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 96 © 2006 Mitchell Repair Information Company, LLC.

Fig. 53: Park Pawl, Design
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Park Pawl, Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 97 © 2006 Mitchell Repair Information Company, LLC.

Fig. 54: Park Pawl, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
In selector lever position "P" the cone (42) moves between the park detent (43) and pilot bushing (40). The
parking lock pawl (43) is therefore pushed against the parking lock gear (4). See Fig. 54. If the tooth of the
parking lock pawl (43) does not engage in a tooth space when the vehicle is stationary, but rather touches a

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 98 © 2006 Mitchell Repair Information Company, LLC.

tooth of the parking lock gear (4), the cone (42) is pre-tensioned by the spring (41) and positioned ready for
operation. If the parking lock gear (4) continues to turn, the parking lock pawl (43) engages in the next tooth
space.
To prevent damage due to misuse, the intervals between the tooth gaps are such that the park detent (43) can
only engage when the vehicle is stationary or crawling at low speed. If the vehicle rolls faster, the shape of the
teeth prevents the parking lock pawl (43) from engaging.
Planetary Gear Set, 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 99 © 2006 Mitchell Repair Information Company, LLC.

Fig. 55: Planetary Gear Set
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Planetary Gear Set, Location

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMI SSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 100 © 2006 Mitchell Repair Information Company, LLC.

Three planetary gear sets are used to produce the different gear ratios. These are located in the mechanical
part of the transmission as the front, center and rear planetary gear set (V, M, H). See Fig. 55
.
Planetary Gear Set, Task

Power transmission and production of different gear ratios.
Planetary Gear Set, Design

A planetary gear set consists of the ring gear (1), the planet gears (2) carried in the planet carrier (4) and
the sun gear (3).
Planetary Gear Set, Function

See PLANETARY GEAR SET, FUNCTION
.
Planetary Gear Set, Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
me
Saturday, October 02, 2010 3:15:26 PMPage 101 © 2006 Mitchell Repair Information Company, LLC.