Cover, Control System

Cover, control system

Special tools:
999 5477 JOINT WEDGE 999 5477 Joint Wedge

Note! As the illustrations in this service information are used for different model years and / or models, some variation may occur. However, the essential information is always correct.

Warning! Avoid skin contact with the oil.

Preparatory work

Cleaning the transmission
Ignition off.
Carefully wash the transmission.

Removal

Removing the oil return pipe




Remove the oil return pipe from the oil cooler and the transmission.

Hint: The quick-release connectors for the oil line are detached by pressing the connection housing for the oil line towards the cover/oil cooler. Hold the connection housing in this position. Pull back the lugs on the connection housing. Pull the connector off the cover / oil cooler.

Removing the splash guard




Remove the splash guard under the engine.
Place a container underneath the transmission.

Note! Leave the container in place for the next few procedures relating to removal.

Note the quantity of oil collected.

Note! The collected oil must not be reused.

Drain the transmission oil.
Tighten the plug. See: Tightening torque, B5254T7, AW55-50/51SN, B5254T7, M66 Tightening Torque.

Removing components from the transmission





Remove:
- the hose from the charge air pipe. Move the hose to one side
- the oil line from the transmission and the oil cooler.

Hint: The quick-release connector for the oil cooler is detached by pressing the connection housing for the oil line towards the oil cooler. Hold the connection housing in this position. Pull back the lugs on the connection housing. Pull the connector off the oil cooler.

Seal the hole in the transmission with a plastic plug.

Removing screws




Remove all screws for the control system cover. Leave the cover in place.
Clean any sealing compound from the threads. Use tap M8x1.25.

Removing the cover for the control system




Remove the cover.
Use gasket wedge 999 5477 JOINT WEDGE 999 5477 Joint Wedge. Tap the wedge carefully into the joint between the cover and the transmission to ensure that the cover sealing flange is not distorted.

Checking and cleaning




Clean the gasket residue from the cover and the transmission.

Note! Make sure that no debris enters the transmission. Wash the cover thoroughly.

Check that the mating surface for the cover is level.

Installation

Applying liquid seal




Wipe the cleaned mating surfaces on the cover and transmission. Use isopropyl alcohol.
Apply an approximately 3 mm thick bead of liquid sealant (P/N 116 1409-6) to the cover. Also apply sealant around the screw holes.

Installing the control system cover




Reinstall the control system cover on the transmission.
Ensure that the liquid gasket is not rubbed off when installing the cover.
Use new screws. Tighten the screws alternately to contact. Tighten. See: Tightening torque, B5254T7, AW55-50/51SN, B5254T7, M66 Tightening Torque.

Installing components





Install:
- the oil line with the quick-release connector to the oil cooler
- the oil line to the transmission. Use a new O-ring. Tighten the screw. See: Tightening torque, B5254T7, AW55-50/51SN, B5254T7, M66 Tightening Torque
- the hose to the charge air pipe.

Filling with oil

Caution! Absolute cleanliness is essential during this work.





Note! Use only transmission oil, P/N 116 1540-8 (1 liter container), 116 1640-6 (4 liter container).

Fill with new oil to the volume previously noted.
Fill with oil through the connector sleeve for the return line in the transmission cover.
Install the oil return pipe for the oil cooler and the cover on the transmission.
Check the oil level. See: Transmission oil level - checking, B5254T7, AW55-50/51SN Checking Oil Level.