Mercedes-Benz ML320. Manual — part 144

Operation

The steering lock interlock prevents the ignition key being removed when the parking lock is not engaged.

The locking pawl (39) is positioned on the exterior contour of the detent plate (38) if the parking lock is not
engaged and if the brake pedal is not depressed. See Fig. 20.

The cables (53, 54) hold the locking valve (60) in its position in front of the locking cam (61) against the force
of the pressure spring. Therefore, the ignition key cannot be turned to the "0" position.

In selector lever position "P" and with the brake pedal in the rest position, the force of the return spring (57) can
pull the locking pawl (39) under the stop at the detent plate (38) and the pressure spring (62) simultaneously
pulls the locking valve (60) away from the locking cam (61).

The ignition key can now be turned to the "0" position and removed from the ignition.

The design of the parking lock interlock is the same as for the steering lock interlock and it functions with
reciprocal action to the steering lock interlock.

Parking Lock, Location/Task/Design/Function

See PARKING LOCK, LOCATION/TASK/DESIGN/FUNCTION.

Parking Lock, Location/Task/Design/Function

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me

Fig. 21: Parking Lock
Courtesy of MERCEDES BENZ OF NORTH AMERICA

Park Pawl, Location

The park pawl gear (4) and park pawl mechanism (4b) are located in he rear section of the transmission
housing. See Fig. 21.

Park Pawl, Task

In addition to the parking brake, the park pawl provides extra mechanical security against the vehicle
rolling away.

Park Pawl, Design

See PARK PAWL, DESIGN.

Park Pawl, Function

See PARK PAWL, FUNCTION.

Park Pawl, Design

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me

Fig. 22: Park Pawl, Design
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Structure

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me

The parking lock mechanism consists of the parking lock gear (4), the parking lock pawl (43), the cone (42)
with spring (41) and the guide sleeve (4). See Fig. 22. The parking shift lock is actuated by the locking pawl
(39) and link rod (37) via the detent plate (38).

Park Pawl, Function

See Fig. 22.

Operation

In selector lever position "P", the cone (42) slides between the parking lock pawl (43) and the guide sleeve (40).
The parking lock pawl (43) is therefore pushed against the parking lock gear (4). 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 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.

AUTOMATIC TRANSMISSION MODEL AND COMPONENT INSTALLATION SURVEY AS-BUILT CONFIGURATION

Transmission 722.6 In Model 163

Component survey for automatic transmission. See COMPONENT SURVEY FOR AUTOMATIC
TRANSMISSION MODEL 163.

COMPONENT SURVEY FOR AUTOMATIC TRANSMISSION MODEL 163

SURVEY OF SYSTEM COMPONENTS, AUTOMATIC TRANSMISSION, LOCATION/TASK/DESIGN/FUNCTION
(WITHOUT TOUCH SHIFT)

Starter Lock-Out Contact, Location/Task/Design/Function

Sales Designation

Model

Engine

Transmission

ML 230

163.136

111.977

722.660

ML 270 CDI

163.113

612.963

722.661

ML 320

163.154

112.942

722.662

ML 350

163.157

112.970

722.674

ML 400

163.128

628.963

722.673

ML 400 CDI

163.128

628.963

722.666

ML 430

163.172

113.942

722.663

ML 500

163.175

113.965

722.666

ML 55 AMG

163.174

113.981

722.666

NOTE:

Transmission Without Touch Shift 722.6 In Model 163

2001 Mercedes-Benz ML320

1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662

me