MERCEDES-BENZ ML430 1997 Complete Repair Manual

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
The mechanism of the ignition lock interlock connects the selector lever of the floor shift with the ETC control
module (N73). See Fig. 163
. It prevents the transmitter key (A8/1) from being withdrawn when the selector
lever is not at position "P".
When the parking lock is not engaged (selector lever position "D", "R", "N"), the locking valve (60) locks the
locking cam (61). The compression spring (62) only pulls the locking valve (60) away from the locking cam
(61) in selector lever position "P". The transmitter key (A8/1) can now be turned to position "0" and removed
from the ignition.
Parking Lock, Location/Task/Design/Function

See PARK PAWL, LOCATION/TASK/DESIGN/FUNCTION
.
Function Of Shift lock Override
Transmission with touch shift 722.6 in MODEL 163
Operation

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1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Fig. 164: Function Of Shift Lock Override
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
If it is not possible to engage a drive position from selector lever position "P" due to a mechanical or
electrical/electronic fault, the selector lever position "P" lock can be released using the shift lock override
function. See Fig. 164
.
To do this a suitable tool must be guided through the flap (95) onto the web (90a) and the web pressed gently
downwards (arrow). The lock lever (90) releases the selector lever. The selector lever can be moved from

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1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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position "P" by simultaneously operating the lock lever.
Location/Task/Design/Function Of R/P Lock

See LOCATION/TASK/DESIGN/FUNCTION OF R/P LOCK
.
Parking Lock, Location/Task/Design/Function

See PARK PAWL, LOCATION/TASK/DESIGN/FUNCTION
.
Function Of Torque Converter Lockup Clutch Control
Operation

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Fig. 165: Function Of Torque Converter Lockup Clutch Control
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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The aim of using the torque converter lockup clutch is to reduce the fuel consumption and exhaust gas
emissions of the vehicle by reducing torque converter slip. See Fig. 165
. This stands in contradiction to the ride
comfort demands made on the drive train with regard to its vibration behavior. The task of the electronic
transmission control is therefore to close to the clutch in all driving situations relevant to fuel consumption, if
possible, and ensure that the engine vibrations are isolated from the drive train.
The characteristic curves shown in the diagram illustrate the different operating states of the torque converter
lockup clutch in relation to the accelerator pedal position and transmission output speed, plotted for one
transmission gear.
In addition to the evaluation of these characteristics, the status of the torque converter lockup clutch is also
determined by other variables.
Variables influencing the states of the torque converter lockup clutch:
Accelerator Pedal Movement
Uphill And Down Hill Gradients
Transmission Shift Functions
ATF Temperature
Durability Requirements
Load Condition
Engine Control Influences
Torque Converter Lockup Clutch Control Pressure, Function

See TORQUE CONVERTER LOCKUP CLUTCH CONTROL PRESSURE, FUNCTION
.
REMOVE/INSTALL TRANSFER CASE
Remove/Install

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1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Fig. 166: Removing & Installing Transfer Case
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
1.1 - Remove noise encapsulation. See REMOVE/INSTALL NOISE ENCAPSULATION
.
2 - Unscrew exhaust bracket (9) and exhaust bracket (10) to exhaust. See Fig. 166
.
3 - Unscrew bolts (14) and remove propeller shaft (13) from transfer case.
4 - Unscrew bolts (12) and remove propeller shaft (11) from transfer case.
NOTE: Model 163.113/128
Only remove rear section of noise encapsulation.
NOTE: Hang up propeller shaft to one side and ensure that the universal joint and
center bearing are not damaged.
Self-locking screw for front propeller shaft on transfer case (rear axle
side). See Torque Specifications; Driveshaft
.

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1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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5 - Detach plug (3) from actuator motor.
6 - Support transmission and remove rear engine crossmember (5) with engine mount.
7 - Slightly lower engine transmission unit.
8 - Support transfer case (2) with lifting device. See SUPPORTING TRANSMISSION WITH
INSPECTION PIT LIFT.
9 - Unscrew bolts (4) and take out transfer case to the back.
10 - Install in the reverse order.
11 - Check filling capacity of transfer case.
Check transfer case (2) for leaks.
Torque Specifications; Driveshaft NOTE: Hang up propeller shaft to one side and ensure that the universal joint is
not damaged.
Self-locking bolt, propeller shaft to transfer case (to front axle). See
Torque Specifications; Driveshaft
.
NOTE:
Engine 112:
Bolt of rear engine crossmember to body.
Engine 112:
Bolt or nut, rear engine mount to transmission.
NOTE: Ensure that no lines are damaged.
NOTE: Transmission plate.
NOTE: Bolt, transfer case to automatic transmission.
Bolt, transfer case to manual transmission.
NOTE: Correct oil level: Bottom edge of filler hole.
Screw plug to transfer case.
DesignationModel 163
Self-locking bolt, front propeller shaft to transfer case (to rear axle)Nm40

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Torque Specifications; Engine Mounts, Engine Supports
Torque Specifications; Engine Suspension, Engine Mounts, Engine Supports
Torque Specifications; Engine Suspension, Engine Mounts, Engine Supports
Torque Specifications; Transfer Case, Complete Unit
Fig. 167: Commercially Available Tools (See Workshop Equipment Manual)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Remove/Install Noise Encapsulation
Self-locking screw, propeller shaft to transfer case (to front axle)Nm50
DesignationEngine 112.942/970 113.942/965/ in model 163.154/157/
172/174/175
Bolt of rear engine crossmember to bodyNm40
Bolt or nut, rear engine mount to
transmissionM8Nm-
M10Nm40
DesignationEngine 612.963 in model
163.113Engine 628.963 in model
163
Bolt/nut, rear engine crossmember to
bodyNm4040
Bolt or nut, rear engine mount to
transmissionNm4040
DesignationEngine 111 in model 163
Bolt of rear engine crossmember to bodyNm40
Bolt or nut, rear engine mount to transmissionNm35
DesignationModel 163
Threaded plug in transfer caseNm30
Bolt, transfer case to automatic transmissionNm20
Bolt, transfer case to manual transmissionNm20

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1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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2001 Mercedes-Benz ML320
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Fig. 168: Removing & Installing Noise Encapsulation
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
1 - Remove headless setscrews (2) and plastic clips (3) from noise encapsulation front section (4). See
Fig. 168
.
2 - Remove noise encapsulation front section (1).
3 - Remove headless setscrews (2) and plastic clips (3) from noise encapsulation center section (4).
4 - Remove (4) noise encapsulation center section.
5 - Remove headless setscrews (2) and plastic clips (3) from noise encapsulation rear section (5).
6 - Remove noise encapsulation rear section (5).
7 - Install in reverse order.
Supporting Transmission With Inspection Pit Lift
Position the lifting device under the transmission and align the adjusting spindles so that the transmission
platform abuts the transmission. The transmission is to be secured to prevent it from falling down by the
adjustable retaining bracket.
AUTOMATIC TRANSMISSION (AT), CONTENTS, FUNCTION DESCRIPTION
Automatic Transmission (AT), Function
Transmission Without Touch Shift 722.6 In Model 163
Automatic transmission 722.6 is an electronically controlled 5-speed transmission with a lockup clutch in the
torque converter.
The ratios for the gear stages are achieved by three planetary gear sets. The 5th gear is designed with a step-up
ratio as an overdrive.
Shifting is initiated electronically. The gears are shifted by the corresponding combination of three
h
ydraulically actuated multi-disc clutches and two mechanical freewheels. CAUTION: Inspect headless setscrews and plastic clips, replace if necessary.
NOTE: There are 6 headless set screws and plastic clips.
NOTE: There are 4 headless set screws and plastic clips.
NOTE: There are 8 headless set screws and plastic clips.

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