DIY 722.9 7G-tronic 7-speed automatic transmission service thread
Junior Member
Joined: Jul 2011
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W204
I did my wife's C300 W204 using these instructions. GREAT JOB on them!
The W203 and W204 are very similar, but not 100% the same. The part I got hung up on was locating the torque converter drain plug location. I finally found it by accident and almost pulled out the wrong bolt.
Also, I bought the Mercedes 722.9 Drive Line Filler Adapter from Tool Source. The pipe was rusted out on the inside of the tube. I used a .22 bore snake to clean it out. Be careful guys.
The W203 and W204 are very similar, but not 100% the same. The part I got hung up on was locating the torque converter drain plug location. I finally found it by accident and almost pulled out the wrong bolt.
Also, I bought the Mercedes 722.9 Drive Line Filler Adapter from Tool Source. The pipe was rusted out on the inside of the tube. I used a .22 bore snake to clean it out. Be careful guys.
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Joined: Jul 2011
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W204
It did not take 12 Liters, but 10 for me.
You pretty much have to replace what you take out, plus 1 Liter.
I took out 9 Liters. I added 1 Liter.
6 Liters is too little. Perhaps your tech was only draining the oil from the pan and not the torque converter. I took out 4 Liters from the torque converter and another 5 Liters from the pan.
You pretty much have to replace what you take out, plus 1 Liter.
I took out 9 Liters. I added 1 Liter.
6 Liters is too little. Perhaps your tech was only draining the oil from the pan and not the torque converter. I took out 4 Liters from the torque converter and another 5 Liters from the pan.
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2006 C350 Sport 6MT
Did you guys run into any trouble with the pressure release valve? We were filming the steps and while pumping we hit the valve and oil started coming out from the top. In panic (we didn't know what had happened) the camera guy dropped his camera in one of the used oil pans. We then started the car for couple of seconds and started pumping again.
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Joined: Sep 2011
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From: Margate, Florida
2009 c300 sport
i thought when u drain the oil from the pan that would include the torque converter as well, i guess i was mistaken.... is it really needed to drain the torque converter since the dealer only quoted 6 bottles of fluid for the 40k mile tranny service? maybe draining the torque converter is done at a later service...by the way mine is not a 4matic if that makes any difference..thanks the info totsubo
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Joined: Mar 2008
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From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
So if you are not flushing it is well worth the wait.
I was advised not to flush the unit if the oil was in good condition.
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From: GA
2016 Chevrolet SS, 2006 Cadillac STS-V
What is the point of bringing the transmission fluid up to 90*C and then back down to 45*C? I'm trying to check the fluid level on a SL500 after replacing the rear main seal on the engine and I guess I read the directions wrong and pulled the plug at 90*C and lost probably 1/2 quart of fluid. It looks like it already has the updated pan.
Thread Starter
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From: Camas, WA
2007 C230SS; 2014 ML350 BT
What is the point of bringing the transmission fluid up to 90*C and then back down to 45*C? I'm trying to check the fluid level on a SL500 after replacing the rear main seal on the engine and I guess I read the directions wrong and pulled the plug at 90*C and lost probably 1/2 quart of fluid. It looks like it already has the updated pan.
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From: GA
2016 Chevrolet SS, 2006 Cadillac STS-V
It says bring to 90*C with additional transmission cooler then turn off and bring to 45*C. I guess I misunderstood what they mean by an additional transmission cooler. I didn't really loose that much fluid though, I probably only lost a few ounces when pulling the transmission out (even after removing the cooler lines) and maybe a 1/2 quart pulling the plug at the wrong temperature. The temperature didn't cool down enough by the time I left today, so I'll try again in the morning to get it right. Is it necessary to add the extra fluid before getting the fluid up to temperature though? Whenever I do the newer Corvettes/Camaros, which have a very similar setup, I usually add the last little bit after getting the fluid up to temperature and with the car running.
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Joined: Apr 2003
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Hello:
I am still investigating the procedure to change the transmission fluid and this posting is very useful, thanks. However I have the following question:
In step 6 of the oil removal procedure, it says "Drain automatic transmission fluid from torque converter", this is in addition to draining the transmission fluid from the oil pan.
The part that I don't understand is, when refilling the transmission with the new oil, I did not see the procedure to refill the fluid for the torque converter. Looking at the 7G transmission picture/diagram, the torque converter is a seperate unit than the transmission itself. SO my question is how does the new transmission fluid get into the torque converter after the transmission is refilled with the new fluid? Am I wrong to assume the torque converter is a seperate unit? Sorry I am not an automatic transmission expert.
Thanks
Jimmy
I am still investigating the procedure to change the transmission fluid and this posting is very useful, thanks. However I have the following question:
In step 6 of the oil removal procedure, it says "Drain automatic transmission fluid from torque converter", this is in addition to draining the transmission fluid from the oil pan.
The part that I don't understand is, when refilling the transmission with the new oil, I did not see the procedure to refill the fluid for the torque converter. Looking at the 7G transmission picture/diagram, the torque converter is a seperate unit than the transmission itself. SO my question is how does the new transmission fluid get into the torque converter after the transmission is refilled with the new fluid? Am I wrong to assume the torque converter is a seperate unit? Sorry I am not an automatic transmission expert.
Thanks
Jimmy
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The TC fills from the main transmission sump. The TC is not separate from the transmission. Fluid is constantly circulated through the TC to cool it.
So you drain the TC to get 4 litres of fluid out of it but you only fill from below the pan. The transmission oil pump will refill the TC.
So you drain the TC to get 4 litres of fluid out of it but you only fill from below the pan. The transmission oil pump will refill the TC.
Thread Starter
Super Moderator
Joined: Dec 2006
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From: Camas, WA
2007 C230SS; 2014 ML350 BT
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Should others search & find this thread - It should be noted that the latest versions of the 722.9 as fitted to W204 etc have the transfer case integral with the transmission.
Newbie
Joined: Oct 2010
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11 GLK350 4Matic
W204, X204
Will the procedure similar to what posted above to change transfer case fluid in 204? Appreciate a lot if there is an instruction.
Senior Member
Joined: Mar 2009
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2006 C230 SS
Does anyone have the link to the document Glyn posted saying the transmission should be reservice every 39,000 miles?
I'm doing a presentation for my engineering class about Mercedes and trying to put up a PPT together with the service, maintenance, manufacturer defects, common problems.
Any information will be of great use! Thanks
I'm doing a presentation for my engineering class about Mercedes and trying to put up a PPT together with the service, maintenance, manufacturer defects, common problems.
Any information will be of great use! Thanks
Newbie
Joined: Oct 2010
Posts: 13
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11 GLK350 4Matic
transfer case oil
Agree that the transfer case is integral in 204. I have chassis whine noise starting 40 mph in my X204. Dealer located the noise and pointed to noisy transfer case. They performed the transfer case oil change using 3 qts. ATF. Does this mean that they just drained out the ATF from pan and then pump in new oil, right?
It seems like what dealer has done is the first part of the 722.9 transmission fluid change before pan dropping and TC drain. In other word, the complete transmission DIY process posted here will take care of the transfer case oil without separate, additional work for transfer case?
It seems like what dealer has done is the first part of the 722.9 transmission fluid change before pan dropping and TC drain. In other word, the complete transmission DIY process posted here will take care of the transfer case oil without separate, additional work for transfer case?
Last edited by hawknight; Mar 21, 2012 at 11:09 AM.
Member
Joined: Mar 2005
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quick question. Is changing the ATF part of any of the MB Services? I ask because I purchased my 06 230 with 65k and do not know if it has been done already. It has all the factory scheduled services done up to that date.. just wondering if this would be part of it.
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Joined: Aug 2007
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From: el paso tx
2002 ML320 2007 C280 avantgard
parts
hello can you post the part numbers and were do you order the parts from?
i`m due for the change on 60500 km so i will trie this on my own dealer quoted 700 dlls
thanks!
i`m due for the change on 60500 km so i will trie this on my own dealer quoted 700 dlls
thanks!
