transmission oil MERCEDES-BENZ ML320 1997 Complete Service Manual

Fig. 36: Electronic Control Module, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation
Signals from the ETC control module (N15/3) are conve rted 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 cont rol 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

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Transmission Housing Breather, Location

The inside of the transmission and the breather (72) are connected by a channel which is cast into the
torque converter casing. See Fig. 39
.
Transmission Housing Breather, Task

The transmission housing vent compensated the pressure in the transmission housing if temperature-
related volume changes in the transmission oil and air occur.
Kick-Down Switch, Location/Task/Design
Fig. 40: Kickdown Switch, Location/Task/Design
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Kick-Down Switch, Position


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Operation
If the piston (B1a) on multiple-disc brake B1 is subjected to oil pressure, it presses the internal and external
discs of the disc set together. See Fig. 44
. The front sun gear (v1) on the housing is locked via the internal
multiple-disc carrier (B1c). the front planetary gears (V2) roll on the front sun gear (V1).
If the rear multiple-disc brake (B2) is engaged via the piston (B2a), then this presses the disc set together. The
center sun gear (M1) is locked against the housing via the internal multiple-disc carrier (B2c). The center
planetary gears (m2) roll on the center sun gear (M1).
If the center multiple disc brake (B3) is engaged via the piston (B3a), then the rear planetary gear carrier (H3)
and the center hollow gear (M4) are locked. When the center multiple-disc brake (B3) is engaged the direction
of rotation reverses.
Multi-Plate Clutch, Location/Task/Design/Function

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Fig. 46: Multi-Disc Clutch, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation
Front Multiple-Disc Clutch (K1) - If the piston (K1a) on the front multiple-disc clutch (k1) is subjected to oil
pressure, it presses the internal and external discs of the disc set together. See Fig. 46.
The front sun gear (V1) is connected to the front planetary gear carrier (V3) via the external multiple-disc
carrier (K1b) and the internal multiple-disc carrier (k1b) and the internal multiple-disc carrier (K1c). The front
planetary gear set is thus locked and turns as a closed unit.
Center Multiple-Disc Clutch (K2) - If the center multiple-disc clutch (K2) is engaged via the piston (K2a), the
piston compresses the disc set Via the internal multiple-disc carrier (K2b) and the center planetary gear carrier
(M3) on which the internal discs are seated, the front hollow gear (v4) of the front planetary gear set is
connected to the center hollow gear (M4) of the center planetary gear set. The front hollow gear (V4) and the
center hollow gear (M4) move at the same speed as the drive shaft (1).
Rear Multiple-Disc Clutch (K3) - If the rear multiple-disc clutch (K3) is engaged via the piston (K3a), then
this compresses the disc set. The center sun gear (M1) of the center planetary gear set is connected to the rear
sun gear (H1) of the rear planetary gear carrier via the external multiple-disc carrier (K3b) and internal multiple-
disc carrier (K3c). The center sun gear (M1) and the rear sun gear (H1) move at the same speed.
Upshift/Downshift Solenoid Valve, Location/Task/Design/Function

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Fig. 49: Upshift/Downshift Solenoid Valve, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation - If a shift solenoid valve (Y3/6y3, Y3/6y4, Y3/6y5) is actuated via the ETC control module
(N15/3), it opens and directs the control pressure (p-SV) to the command valve assigned (31). See Fig. 49
.
The respective shift solenoid valve (Y3/6y3, Y3/6y4, Y3/6y5) remains actuated and therefore open until the
shift process is completed. The shift pressure (p-SV) to the command valve is reduced to zero as soon as the
respective shift solenoid valve (Y3/6y3, Y3/6y4, Y3/6y5) is switched de-energized.
Automatic Transmission, Location Of Components, Floor Shift (With Touch Shift)
Fig. 50: Automatic Transmission, Location Of Components, Floor Shift
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Location/Task/Design/Function Of Oil Pump

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Fig. 51: Location/Task/Desi gn/Function Of Oil Pump
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Oil Pump, Location

The oil pump (crescent-type pump) (6) is installed in the torque converter housing behind the torque
converter and is driven by the drive flange of the torque converter. See Fig. 51
.
Oil Pump, Task

To produce the necessary oil pressure for the hydraulic sequences.
Oil Pump, Design

An external gear (6a) which is m ounted eccentrically in the pump housi ng is located on the internal gear
(6b) which is connected to the drive flange (6b). The crescent (6c) drives the external gear (6a).
Oil Pump, Function

When the engine is running oil is delivered through th e suction gallery (6e) along the top and bottom side
of the crescent (6c) to the pr essure chamber (6d) of the housin
g. The meshing of the teeth prevents oil

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Lubricates and cools the mechanical part of the transmission, and limits the pressure in the torque
converter.
Lubrication Pressure Regulating Valve, Function

See LUBRICATION PRESSURE REGULATING VALVE, FUNCTION
.
Lubrication Pressure Regulating Valve, Function
Operation - At the working pressure regulating valve (22) surplus oil is diverted to the lubrication pressure
regulating valve (23), from were the lubrication pressure (p-Sm) is used in regulating amounts to supply the
transmission lubrication system including the torque converter. See Fig. 76
.
Fig. 76: Lubrication Pressure Regulating Valve, Function

2001 Mercedes-Benz ML320
1998-03 AUTOMATIC TRANSMISSIONS Complete Transmissions - ML 320 - 722.662
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Hydraulic control of the torque converter lockup clutch and distribution of the lubricating oil.
Torque Converter Lockup Clutch Regulating Valve, Function

See TORQUE CONVERTER LOCKUP CLUTCH REGULATING VALVE, FUNCTION
.
Torque Converter Lockup Clutch Regulating Valve, Function
Fig. 80: Torque Converter Lockup Clutch Regulating Valve, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Operation - The converter lockup clutch regulating valve (27) regulates the working pressure in the converter

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lockup clutch (p-KUB) depending on the control pressure in converter lockup clutch (p-S/KUB). See Fig. 80.
Depending on the working pressure in the converter lockup clutch (p-KUB) the converter lockup clutch (KUB)
is:
Engaged
Disengaged
N slip mode
In the lower position of the converter lockup clutch regulating valve (27) lubricating oil (p-Sm) flows through
the torque converter and oil cooler (65) into the transmission (converter lockup clutch depressurized). In its
regulating position (slipping, torque converter lockup clutch pressurized), a reduced volume of lubricating oil
(p-Sm) flows through the annular passage (27a) bypassing the torque converter and passing direct through the
oil cooler (65) into the transmission. The other part of the lubricating oil (p-Sm) is led via the restrictor (a) into
the torque converter for cooling the converter lockup clutch (KUB).
R/P Lock, Location/Task/Design/Function

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Fig. 93: Float, Function
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Function - With low oil levels, the lubrication oil which flows constantly out of the gearset, flows back to the
oil gallery (A) through the opening (46). If the oil level rises, the oil presses the float (45) against the housing.
See Fig. 93
.
The float (45) therefore separate the oil gallery (A) from the gearset chamber (B). The lubricating oil which
continues to flow out of the gearsets is thrown against the housing wall, incorporated by the rotating parts and
flows back into the oil
gallery (A) through the upper opening (arrow).

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