722.9 Clutch Drum 2004, used and ready to install. Fits the 722.9. Ships fast from the USA.
This is a used aluminum B2 brake clutch drum for the Mercedes-Benz 722.9 seven-speed automatic (7G-Tronic), the transmission behind most 2004-and-later Mercedes cars and SUVs. This one came out of a 2012 C250 sedan with the 1.8L turbo four-cylinder. Buyers usually need it after a teardown turns up a cracked or damaged B2 housing, or when a 722.9 will not move forward or slips in the lower gears.
The 722.9 uses one Ravigneaux gear set plus two simple planetary sets, controlled by three clutches (K1, K2, K3) and four brakes (B1, B2, B3, BR). A brake does not drive anything; it holds a gear member to the case. Transmission Digest explains that the B2 brake is applied in 1st through 4th and holds the rear sun gear, which is what lets the output shaft take drive through the rest of the gear train. This housing carries the B2 plates and its apply piston, so if it leaks or the piston is wrong, the car loses the lower four gears together.
Not every harsh or slow engagement needs a drum. The Mercedes tip above fixes harsh P-D engagement with an adaptation relearn, and a worn solenoid or valve body can also delay engagement. Our 722.9 delayed engagement guide covers those checks. If the unit will not move at all, work through the 722.9 no-movement diagnosis first: fluid level, the electrohydraulic control unit, then internal checks. Once the pan is off and you see B2 friction material, or the housing will not hold air with fresh seals, replace the drum.
We list this drum as 722.9, 2004 and up, and it was pulled from a 2012 C250 1.8L. The 722.9 was built in more than one torque-capacity version depending on the engine it sits behind, and plate counts can change between them. Before installing, compare the housing, piston and spline count with the one you took out, or send us your year, model and VIN and we will check it. More 7G-Tronic parts are on the 722.6 and 722.9 parts page.
| Fits | 722.9 2004 |
| Part type | Clutch Drum |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is the B2 brake clutch drum, aluminum, removed from a 2012 Mercedes C250 with the 1.8L turbo four-cylinder. Compare it with the photo and the drum you removed.
It may, but the 722.9 came in different torque versions and plate counts. Match the housing, piston and splines to your old part, or send year, model and VIN so we can check fitment.
Because B2 is applied in 1st through 4th, a B2 problem usually means no forward movement or slipping in the lower gears, while reverse may still work. Harsh P-D engagement can also trace back to the B2 pack.
Yes. Mercedes calls for an N-D and N-R adaptation relearn when the B2 pack causes harsh engagement, and new clutches need fresh adaptation values after any rebuild.
Installing the B2 inner apply piston upside down. Transmission Digest documents a 722.9 with no forward movement after overhaul for exactly that reason.
