1997 MERCEDES-BENZ ML430 torque

Fig. 165: Function Of Torque Converter Lockup Clutch Control
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 3:15:30 PMPage 295 © 2006 Mitchell Repair Information Company, LLC.

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

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:30 PMPage 296 © 2006 Mitchell Repair Information Company, LLC.

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
.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:30 PMPage 297 © 2006 Mitchell Repair Information Company, LLC.

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

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:30 PMPage 298 © 2006 Mitchell Repair Information Company, LLC.

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

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:30 PMPage 299 © 2006 Mitchell Repair Information Company, LLC.

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.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:30 PMPage 301 © 2006 Mitchell Repair Information Company, LLC.

Basically automatic transmission 722.6 with electronic control offers the following advantages:
Reduced Fuel Consumption
Improved Shift Comfort
More Favorable Gear Steps As A Result Of 5 Gears
Enhanced Life And Reliability
Reduced Servicing Costs
The electrohydraulic control unit is bolted onto the bottom of the transmission housing. The end of the
transmission is formed by an oil pan made of sheet steel.
The oil pressure for the converter lockup clutch and center multiple-disc clutch is supplied via holes in the input
shaft. The oil pressure to the rear multiple-disc clutch is routed through the output shaft. The lubricating oil is
supplied and distributed by additional bore holes in both shafts. All bearing points of the gear sets as well as
freewheels and shift elements are supplied with lubricating oil.
The parking lock gear and drive flange are connected to the output shaft by gearing.
Freewheels F1 and F2 optimize shifting. The front freewheel (F1) rests against the stator shaft extension on the
transmission side and connects the sun gear of the front planetary gear set to the transmission housing in the
locking direction.
The torque converter housing and transmission housing are made of a metal alloy. They are bolted together and
centered via the outer multiple-disc carrier of the multiple-disc brake B1. A coated intermediate panel seals the
two components.
The oil pump and outer multiple-disc carrier of the front multiple-disc brake are bolted to the converter housing.
The mechanical part consists of the propeller shaft, output shaft, a sun gear shaft and three planetary gearsets
which are coupled together.
In transmissions for powerful engines, the planetary gearsets have 4 planetary gears, while for less powerful
engines the front and rear planetary gear system has three planetary gear wheels. The stator shaft is pressed into
this and is secured against turning by a spline.
The rear freewheel F2 connects the sun gear of the center planetary gear set to the sun gear of the rear planetary
gearset in the locking direction.
The electrohydraulic control unit consists of the shift plate made of light alloy for hydraulic control and an
electronic control unit.
The electrical control unit consists of a supporting body made of plastic in which the electrical components are
combined. The shell is screwed to the shift plate. Conductor tracks which are integrated into the shell, connect
the electric components to a plug connector. This 13-pin plug connector forms the connection with the vehicle-
side wiring harness and with the ETC 5 (electronic transmission control) control module (N15/5) via a bayonet
lock.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:30 PMPage 302 © 2006 Mitchell Repair Information Company, LLC.

See OIL LEVEL CONTROL, FUNCTION
.
Function of Torque Converter Lockup Clutch Control

See FUNCTION OF TORQUE CONVERTER LOCKUP CLUTCH CONTROL
.
Torque Converter Lockup Clutch Control Pressure, Function

See TORQUE CONVERTER LOCKUP CLUTCH CONTROL PRESSURE, FUNCTION
.
Function Of Locking Of Selector Lever Position "P"

See FUNCTION OF LOCKING OF SELECTOR LEVER POSITION "P"
.
Ignition Lock Locking, Function

See IGNITION LOCK INTERLOCK
.
Function Of Shift Lock Override

See FUNCTION OF SHIFT LOCK OVERRIDE
.
Survey Of System Components, Automatic Transmission, Location/Task/Design/Function

See SURVEY OF SYSTEM COMPONENTS, AUTOMATIC TRANSMISSION,
LOCATION/TASK/DESIGN/FUNCTION.

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Saturday, October 02, 2010 3:15:30 PMPage 304 © 2006 Mitchell Repair Information Company, LLC.