Mercedes-Benz ML320. Manual — part 153

Fig. 36: Electronic Control Module, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Operation

Signals from the ETC control module (N15/3) are converted into hydraulic functions in the electric valve
control unit (Y3/6). The RPM sensors (Y3/6n2, Y3/6n3), the starter lockout contact (Y3/6s1) and the
transmission oil temperature sensor (Y3/6b1) of the electrical control unit (Y3/6) supply the ETC control
module (N15/3) with input signals. The solenoid valves are controlled by the ETC control module (N15/3) and
trigger the hydraulic functions. See Fig. 36.

Location/Task/Design/Function Of Freewheel

Fig. 37: Function Of Freewheel
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Freewheel Location

2001 Mercedes-Benz ML320

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

me

In the front planetary gear set a freewheel (F1, F2) is installed between the front sun gear (V1) and the
stator shaft (8) and in the rear planetary gearset between the rear sun gear (H1) and the intermediate shaft
(3). See

Fig. 37

.

Freewheel Task

Optimizes individual gearshifts. Support of the individual elements of a planetary gear set against each
other or against the transmission housing in one direction of rotation in order to permit torque
transmission.

Freewheel Design

The freewheels (F1, F2) consist of an outer race (12), an inner race (13), a number of clamping bodies
(14) and a clamping body cage (15).

Freewheel Function

See FREEWHEEL, FUNCTION.

Freewheel, Function

2001 Mercedes-Benz ML320

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

me

Fig. 38: Freewheel Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320

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

me

Operation - If the inner race (13) of the freewheel is locked and the outer race (12) turns in direction "A" , the
locking elements (14) adopt a diagonal position on account of their special contours, allowing the freewheel
function. See

Fig. 38

. The outer race (12) slides over the locking elements (14) with negligible friction. If the

rotation of the outer race (12) changes to direction "B", the locking elements (14) stand up and lock the outer
and inner races (12, 13) together.

Transmission Housing Breathing, Location/Task

Fig. 39: Transmission Housing Breather, Location/Task
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320

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

me