What you will need
Instructions on how to change the conductor plate and valve body on Mercedes-Benz 722.6 5G transmission.
- Allow the car to cool down. Raise your car using a car lift, ramps, or jack stands.
- Secure the vehicle with jack stands. Set parking brakes. Block rear wheels to prevent the vehicle from rolling back.
- Remove the splash shield from under the vehicle. They are held in place with several 8mm screws.
- Place an oil pan under the transmission. Locate the drain plug at the bottom of the transmission pan and remove it using a 5mm Allen Socket and drain all transmission oil. Reinstall the drain plug using a new washer.
- Remove the Allen or T30 Torx bolts that hold the transmission pan in place, but keep track of the position of every bolt as they are not all the same length.Lower the pan carefully, as there will be some oil left in it.
- Remove the oil filter by pulling it downwards. When it comes out, a small amount of oil will splash out of the valve body.
- Locate the plug connector from the transmission. Turn the bayonet lock counterclockwise and pull the plug out. Locate and remove the bolt found in the center using a deep 7mm socket, and wiggle the connector out.
- Locate and remove the T30 Torx bolts that hold the valve body and conductor plate assembly in place. Do this in a zig-zag pattern. Lower the valve body assembly from the car.
- Working on a clean table or workbench, remove the yellow plastic covers at the top side of the conductor plate. Underneath it, there are six solenoids held in place by three brackets. Remove the T30 Torx bolts and pull out the solenoids carefully.
- The connector plate is held in place with plastic tabs. Pull it up until it breaks free, remove it from the valve body, and then install a new connector plate in the same way.
- When reinstalling solenoids, make sure to place them in their original locations. Reinstall the brackets and place the plastic covers back on.
- When raising the valve body assembly back into the gearbox, make sure that the gear selector lever fits into the sliding tab located on the side of the body. If skip this step, the vehicle will not drive when placed in Reverse or Drive.
- Smear a small amount of transmission oil on the o-ring of the new filter and push it into the hole in the valve body until it pops into place.
- Replace oil pan gasket.
- Clean the transmission pan very carefully. Avoid leaving any debris or lint in the oil pan. There is a magnet at the front side, which you will need to remove and clean away any metal shavings from it before reinstalling.
- Reinstall all transmission pan bolts. Take extra care when starting bolts, as they can cross-thread easily. At the first stage, hand-tighten them until snug in a criss-cross pattern. Then tighten them up to 8Nm with a torque wrench again in a criss-cross pattern.
- Under the hood, locate the transmission dipstick tube—brake off the red clip.Remove the plug and place a suitable funnel into it. Pour in 3.5 liters of transmission oil and then put the dipstick in.
- Start the car and let it idle for 5 minutes. Drive it for another 5 minutes. During this time, shift it through the gears several times to make the oil move inside the transmission.
- Back under the hood, pull out the transmission dipstick to check the oil level and add more if needed.
In the end, all error codes need to be cleared and recalibrate the transmission with a Mercedes-Benz scanner as this ensures the best performance. This can be done by a Mercedes-specific diagnostic tool, or you can take it to a dealer or Mercedes specialist.
The Mercedes five-speed automatic called the Mercedes-Benz 5G-Tronic, also known as 722.6, is their first electronically controlled transmission. If your car is from that time, it most likely has a five-speed auto transmission. Although robust and reliable in general, this transmission has a couple of weak points. One is a faulty conductor plate. Another is leaking the 13-pin connector. In this guide, we will be explaining exactly how to fix the issue(s).
- 722.6 transmission pan bolts should be torqued to 8 Nm (71in. lbs.)
- 722.6 transmission drain plug torqued to 20 Nm (15 in. lbs).
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Do you have to program the conductor plate on 722.6 transmissions?
The new conductor plate comes pre-programmed and ready for fitment. 722.6 does not need coding in most cases. However, you still need to clear the codes and run a calibration procedure to ensure the best results. This can be done by a MB specific diagnostic tool, or you can take it to a dealer, or a Mercedes specialist.
What are some of the symptoms of a bad conductor plate or valve body?
- Harsh gearshifts
- Downshifts taking more time than usual
- Transmission going into Limp mode
- Staying in second gear all the time