DIY 722.9 7G-tronic 7-speed automatic transmission service thread




To answer your other question, I hate to be so blunt but NO, you can NOT service the 7G without STAR or an infrared thermometer. This transmission is VERY picky with fluid level, and it must be checked an adjusted just as described in the documents I posted, or you will likely suffer serious transmission damage. So, if you are not absolutely comfortable buying the correct tools, and following the procedures, please find a good indy to do it for you.
Any help is much appreciated here
The Best of Mercedes & AMG
When I did this job on my vehicle, I used the thermometer coupling on my Fluke multimeter. It's a simple (and accurate) temperature probe. You simply hold the probe to the pan and it gives an instant reading of temperature. While I understand that everybody wants to be as accurate as possible, as long as you're within a few degrees, everything will be fine. Just find a reliable way to measure the pan temperature and it will all be OK.


Any help is much appreciated here
Shifting at a high Rpm - is it working OK otherwise?
If so, check the setting of the C/S button by the sifter (assuming you car has one like mine does?). Select comfort setting.




Ring magnets shown at arrows
Last edited by kafklatsch; Apr 30, 2017 at 02:11 AM.
At any rate the trans shifts 100% better now. Pretty much like new.
Btw. Thanks for all who paved the way on this.
Last edited by CO_Steve; Jun 5, 2017 at 06:43 PM.


I made one of these above.
Motive Power Fill Pro - yes it cost more than garden sprayer but you will only have to buy it once!
(I would not want to pump brake fluid and AT fluid with the same pump)
Used it one time so far and it works as designed.
Last edited by arto_wa; Jun 6, 2017 at 07:05 PM.
QUESTION: With regards to Draining the Torque Converter.
* I like to keep things clean - i.e. The Inside of the Bellhousing, as well as the Garage Floor

* With this in mind, have any of you guys made some sort of a "shield" or "funnel modification" that effectively directs the flow of old/used fluid from the Torque Converter to your collection pan?
* If you have made a tool for this purpose, can you please post some pictures?
Thanks in advance,
fast_dave


Easy to improvise once you remove the rubber plug and take a closer look .




Is there some reason I would want to make this item versus purchase it? I've seen the adapters on eBay for as little as $7 from China, and there's one made by Mighty Vac which can be picked up at O'Reilly for like 15 bucks and had for Less other places online. Is there some advantage to making it versus just purchasing it?
Also regarding the garden sprayer I recall reading somewhere that there is an inexpensive one from Walmart that does a good job.
Can someone point me to this item, post a link?
lastly if I purchase the adapter such as the Mighty Vac one will I be able to use the garden sprayer with that tool?
Last edited by C230 Sport Coup; Jun 7, 2017 at 05:25 PM.


I got the instructions from someone on this forum but do not remember his posting ID, sorry.
You can just follow the above instructions or buy ready made adapter from somewhere. I think the Assenmacher one was little pricey!
Last edited by arto_wa; Jun 7, 2017 at 08:12 PM.




Waiting to here from the person who used that and how it worked out.



