Mercedes-Benz ML320. Manual — part 197

Shift Pressure Shift Valve, Function

See SHIFT PRESSURE SHIFT VALVE, FUNCTION.

Shift Pressure Shift Valve, Function

Fig. 140: Shift Pressure Shift Valve, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Operation

2001 Mercedes-Benz ML320

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

me

When the multiple-disc brake (B) is engaged, the working pressure (p-A) is applied to the end face of the shift
valve (29) via the command valve (31). See Fig. 140. Its shift condition is retained in the shift phase, whilst the
shift element pressure acting on the end face and which is variable during the shift phase is replaced by a
corresponding, constant pressure.

When the multiple-disc clutch (K) is engaged (K) the end face of the shift pressure shift valve (29) is
depressurized during the stationary and shift phases, here the shift condition is also retained during the shift
phase.

Torque Converter Lockup Clutch PWM Solenoid Valve, Design

2001 Mercedes-Benz ML320

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

me

2001 Mercedes-Benz ML320

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

me

Fig. 141: Torque Converter Lockup Clutch PWM Solenoid Valve
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Structure

The torque converter lockup PWM solenoid valve (Y3/6y6) is sealed off to the valve body of the shift plate (2a)
by an O-ring (34) and a seal (arrow). See Fig. 141. The contact springs (32) on the PWM converter lockup
solenoid valve (Y3/6y6) engage in a slot in the conductor tracks (33). The force of the contact spring (32)
ensures safe contacts.

Manual Drive Mode Selection, Function (Without Touch Shift)

2001 Mercedes-Benz ML320

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

me