722.9 Planetary 2009, used and ready to install. Fits the 722.9. Ships fast from the USA.
This is a used, factory Mercedes-Benz hard part for the 722.9 seven-speed automatic (7G-Tronic), pulled from a 2009 W211 E550. It is the front section of the planetary gear train: the shaft and drum assembly that carries the front sun gear. Buyers usually land here with a 7G-Tronic already on the bench, or with a 2009 E-Class that has developed a whine that follows road speed, a gear that drops out, or a gear ratio fault that returns no matter how often the adaptations are reset. Hard parts for the 722.9 are rarely sold new as separate pieces, so a clean original part from a matching year is often the sensible way to finish the job.
The 722.9 builds seven forward speeds and two reverse gears from four planetary gearsets, two of them combined into a compound Ravigneaux set, controlled by four multi-disc brakes and three multi-disc clutches. Unlike the five-speed 722.6 it replaced, there are no sprags or one-way clutches at all; every ratio and every shift is made by the control unit applying one element while releasing another. The sun gears are the members those brakes and clutches grab, so a sun gear with worn splines, a scored bushing or a pitted tooth face affects every gear that routes power through it. Because the transmission also skips gears on downshifts, the front gearset sees rapid direction and load changes that expose any looseness in its bearings and thrust washers.
Keep in mind that the more common 722.9 complaints are electrical: the conductor plate with its speed sensors and the solenoids in the valve body. Those cause harsh or flared shifts and limp mode too, so rule them out before pulling the gear train. Our 722.9 solenoid kit covers the hydraulic side when the codes point there.
Read the transmission control unit with a scan tool that shows actual input and output speeds per gear. A sun gear or planetary failure shows as a ratio error in the gears that use that set even when solenoid current and fluid level are correct. Drain the fluid and inspect the pan and filter; ferrous glitter plus a speed-dependent whine is the classic sign of a geartrain problem rather than a valve body one. The diagnostic steps in our Mercedes 722.6 problems guide on reading adaptation data and isolating electrical faults apply to the seven-speed as well.
This part came out of a 2009 E550 (W211 chassis) with the 722.9. Mercedes used the 722.9 across many models from 2003 onward and changed internal parts over the production run, so the year alone is not a guarantee. Compare the shaft length, spline count and sun gear tooth count against your original before installing, or send us your year, model and VIN and we will check it. Other 722.9 hard parts, including the 722.9 sun shell and the later 722.9 planetary, are listed on our 722.6 and 722.9 parts page.
| Fits | 722.9 2009 |
| Part type | Planetary |
| Condition | Used |
| Brand | OEM |
| Reference | W211 |
| 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 front section of the 722.9 gear train from a 2009 E550: the shaft and drum assembly that carries the front sun gear, as shown in the photo. It is not a full set of all four gearsets.
It came from a 2009 W211 E550. Many 722.9 applications share parts, but Mercedes revised internals during production. Match shaft length, splines and tooth count to your original, or send your VIN and we will check fitment.
A 2009 722.9 uses MB 236.14 ATF. Do not mix it with 236.15 fluid, which was released for later seven-speed units.
Yes. On the 722.9 a pump bushing or torque converter can also whine. A planetary whine follows road speed in specific gears; a pump or converter noise usually follows engine speed even in Park.
Yes. Clear the stored codes, reset the transmission adaptations with a capable scan tool and drive the vehicle through all gears so the control unit can relearn shift timing.
