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

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Dec 30, 2013 | 03:43 PM

#126

Uncle

Junior Member

Joined: Jul 2012

Posts: 71

Likes: 1

2010 C300

Warm to the touch is 115 to 120F, 45 to 47C. I think if you added fluid, let the engine run for about 15 minutes, and ran it thru the gears, and felt the bottom of the pan, it would be warm to the touch. Remove the hose, and let the overflow run. If you get none, add fluid. You will be OK.

Jan 3, 2014 | 03:36 PM

#127

Jschroter

Newbie

Joined: Dec 2012

Posts: 8

Likes: 0

From: Medfield, Mass

E320 Bluetec 2008

W211.022 2008 E320 Where is my torque converter drain?

Hi
Many thanks to all who have posted. I plan to try.
I have a 2008 E320 Bluetec
W211.022 Chassis
722.902 Tranny
642.920 Motor
I am about to do the transmission flush.
I can't find the torque converter drain plug. Please help.
(I was able to purchase the torque drain plug - tiny thing with 4MM hex)
So I know my car has one...is it accessible?
I removed the black cover of the housing and i rotated the crank by starting the car a bunch of times. I could not find the torque converter plug. I don't know how to do it manually.

I did see a transmission line return. Is there a different drain procedure for this car? Please reply soon as my fluids arrive tomorrow.

See attached pics.
https://www.dropbox.com/s/ih2cobe7e30bkmr/DSCN3267.JPG
https://www.dropbox.com/s/8qf30ryrc5l2h1e/DSCN3244.JPG
https://www.dropbox.com/s/epljsidi9ocq9hz/DSCN3283.JPG

I spoke to 2 dealers and they quoted $560 but only planned to drop the pan and change the filter and would only use 6 quarts. No torque converter flush.

John in Medfield Ma.

Jan 3, 2014 | 04:26 PM

#128

Uncle

Junior Member

Joined: Jul 2012

Posts: 71

Likes: 1

2010 C300

Use a 27MM socket on the crank bolt and turn it by hand to find the plug. Mark the pully so you know your staring position. The plug is small, and by bumping the starter, it is eay to miss. I did not find mine until the second time around. It is not on the extreme bottom edge of the Torque Converter, but on the lower forward side.

Jan 3, 2014 | 11:06 PM

#129

Jschroter

Newbie

Joined: Dec 2012

Posts: 8

Likes: 0

From: Medfield, Mass

E320 Bluetec 2008

Hello Uncle,
Is the crank bolt accessible from underneath or from the top?

Jan 4, 2014 | 10:15 AM

#130

Jschroter

Newbie

Joined: Dec 2012

Posts: 8

Likes: 0

From: Medfield, Mass

E320 Bluetec 2008

Found it finially!!!
I didn't have a helper and
It took 15 little turns of the crank pulley with a 27 mm to find it.
4mm hex.
I'm ready!

Feb 1, 2014 | 10:15 AM

#131

SparksterC43

Junior Member

Joined: Jun 2009

Posts: 61

Likes: 1

From: Nashville, TN

2008 ML320cdi, 2008 SL600Renntech, 2009 C63

I am sorry if this has already been answered but I have an ml320cdi and there is a big difference in the car being level and the transmission pan being level. Which do I use. To get the transmission pan level, I will have to jack up the rear about 8 inches over the front

Thanks

Jay

Feb 3, 2014 | 11:59 AM

#132

ddombrowski

Junior Member

Joined: Jun 2013

Posts: 23

Likes: 4

2010 GLK350 4matic, 2014 Mazda 6, 1983 Porsche 944,

Car has to be level. Remember these procedures are written with the assumption that most of the time the car will be on a lift. You'd never want a car on a lift to not be level (if you could even operate the lift that way).

Feb 9, 2014 | 06:04 PM

#133

spyked

Super Member

Joined: Oct 2012

Posts: 583

Likes: 24

2026 GLC300 4Matic (X254)

Does anyone know if this method for the 722.9 7G Tronic would apply to the updated 7G Plus? The 7G Plus has some updated parts/components....but since the unit was introduced in the middle of some chassis generations, I'm think it must have the same access points (like drains, overflow tubes, torque converter drain).

Anyone confirm? I am unable to find a single piece of information anywhere on how to service a 7G Plus, while it seems there is plenty of info for standard 7G Tronic.

Thanks in advance!

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Feb 11, 2014 | 01:03 AM

#134

dave2001auto

Senior Member

Joined: Jul 2013

Posts: 493

Likes: 14

84 300d 2009 e320 bluetec (retired)/, now 2012 E350 4-matic blueefficiency automatic

Quote:

Originally Posted by spyked

Check for the required ATF, it might be the blue ATF134FE instead of the red ATF134.Anybody has the WIS for it?
europeantransmission.com has a write up on the design.

Feb 11, 2014 | 08:15 AM

#135

Glyn M Ruck

Super Moderator

Joined: Jun 2008

Posts: 19,942

Likes: 192

From: Llandudno, Cape Town, South Africa

late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires

Quote:

Originally Posted by spyked

The service process is the same as the 722.9. The big difference is the new blue 236.15 fluid requirement & 120K Kilometer drain interval. We will see how this works in practice.

Feb 11, 2014 | 07:23 PM

#136

spyked

Super Member

Joined: Oct 2012

Posts: 583

Likes: 24

2026 GLC300 4Matic (X254)

Quote:

Originally Posted by Glyn M Ruck

The service process is the same as the 722.9. The big difference is the new blue 236.15 fluid requirement & 120K Kilometer drain interval. We will see how this works in practice.

Thanks. Was hoping that's the case so the techs in the U.S. don't have to learn a new process (especially since some of them can barely find a torque converter drain apparently).

I will probably have mine changed at 39k anyway, with the 236.15 fluid of course, that way I'm covered. And if they screw something up it's under warranty.

Feb 12, 2014 | 09:05 AM

#137

Glyn M Ruck

Super Moderator

Joined: Jun 2008

Posts: 19,942

Likes: 192

From: Llandudno, Cape Town, South Africa

late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires

I think a 39K mile change is wise. I would like to see a whole lot of fluid analysis at the extended drain interval to convince me it's OK. A friend of mine has had his ML sitting at Park Place in Dallas for 3 weeks. They ran out of the 236.15 fluid. Seems there is a shortage. His vehicle is new & sprung a leak.

Feb 18, 2014 | 04:36 PM

#138

Nero Tenebre

Super Member

Joined: Jan 2011

Posts: 515

Likes: 11

From: Houston, TX

W209 CLK Renntech Widebody, C140 CL600 V12, AP2 S2000, NSX Twin Turbo, R8 V10

It's about time for me to do this service now per expert recommendations...

http://db.tt/o6lj4FT4
http://db.tt/1Jl9nssE

These links were dead, are there replacements?

Thanks to all those contributors who've helped me and others, Glyn and Rodney personally.

Feb 18, 2014 | 05:54 PM

#139

dave2001auto

Senior Member

Joined: Jul 2013

Posts: 493

Likes: 14

84 300d 2009 e320 bluetec (retired)/, now 2012 E350 4-matic blueefficiency automatic

Quote:

Originally Posted by Nero Tenebre

Can't help with those files. In the first posting of this thread, the attached files contain the WIS and other info. Inspect the TCU boot/o-ring for leaks before draining the ATF. Check out youtube for some video's.

I would NOT start the car without ATF as shown in some of the youtube video's.

Last edited by dave2001auto; Feb 19, 2014 at 08:00 PM.

Feb 19, 2014 | 02:08 PM

#140

Nero Tenebre

Super Member

Joined: Jan 2011

Posts: 515

Likes: 11

From: Houston, TX

W209 CLK Renntech Widebody, C140 CL600 V12, AP2 S2000, NSX Twin Turbo, R8 V10

Thanks, are you going to post a drop box or other FTP link? Or will they send over email and I send you my address?

Also does anyone know about another pan redesign? My tech says the dealer told him they replaced that pan with another 220 270 12 12, instead of 220 270 09 12 which is the updated pan. I think he may be wrong though because I can't find that part number on the web anywhere but I can find the 09 12 one of course.

Feb 22, 2014 | 12:04 PM

#141

johnand

Thread Starter

Super Moderator

Joined: Dec 2006

Posts: 2,403

Likes: 64

From: Camas, WA

2007 C230SS; 2014 ML350 BT

Quote:

Originally Posted by Nero Tenebre

Sorry about that. Those files are in the MB World Wiki now, so I pulled them from my Dropbox account. I updated the 1st post with the correct links.

Feb 22, 2014 | 12:10 PM

#142

Nero Tenebre

Super Member

Joined: Jan 2011

Posts: 515

Likes: 11

From: Houston, TX

W209 CLK Renntech Widebody, C140 CL600 V12, AP2 S2000, NSX Twin Turbo, R8 V10

Hey no problem John- there was enough information in the other documents and youtube videos to understand what needs to be done and with which parts. Thanks for this thread btw.

It turns out the 12 12 part number does actually supersede the 09 12 listed but I had the updated 09 12 and no problems with it so I just kept it and did the service at 40k miles. My indy tech said that the filter was really dirty so he's going to start checking the cars at his shop every 40k miles as recommended by the experienced guys here. Kudos to you guys for your great advice, it makes owning these cars more sensible when there is community support available.

Feb 25, 2014 | 08:49 PM

#143

newamerican

Newbie

Joined: Feb 2014

Posts: 4

Likes: 0

E350

Thanks for the post!

Thanks for the post!

Quote:

Originally Posted by johnand

So, I just completed the 2nd 722.9 7G transmission service, so I have decided to start a thread and post a DIY write-up.

As most of you know the 722.9 transmission does NOT have a dipstick tube, so checking fluid level via a dipstick is not possible. But, with a few quality tools a moderately competent person can service their own 722.9 transmission and check the level themselves.

The fluid level is checked via an overflow method using a MB STAR Diagnostic system at a specified fluid temperature. If you have access to one, great. If you don't, that is OK, all that is needed is a quality infrared thermometer. I have a MB STAR clone system and have verified that a Fluke 62 infrared thermometer read within 1-2 degrees of what the STAR system does.

Attached are the following documents:

1)722.9 Transmission Service - This is my write-up of how to properly service the 722.9 transmission including all parts and tool needed.

2)Automatic Transmission Oil and Filter Change - This is the latest up to date MB WIS document on how to service the transmission.

3)Automatic Transmission Fluids (ATF sheet 236) - This is the latest up to date MB WIS document on approved ATF.

4)Drain Transmission Fluid from Torque Converter - This is the latest up to date MB WIS document on how to drain the torque converter, which is now required as part of the transmission service.

5)Filling Automatic Transmission with Fluid - This is the latest up to date MB WIS document on filling the transmission and checking fluid level.

6)Oil Pan and Overflow Tube Modified - This is the latest up to date MB WIS document explaining the new updated pan and overflow tube that is required if you have the old out of date pan.

I also have 2 files that are extensively detailed on the design, operation, software, and maintenance. They are posted in the MBWorld Wiki here:

722.9 Study Guide
722.9 Tech Guide

I did not take pictures of the procedure, but took video. I am still trying to process the video. The video portion is just fine, but the sound is horrible and barely legible. I may record a new audio track. I will post the video up when complete. I should be able to add still shots from the video to the write-up at least.

Another thing of note. The WIS document for servicing the transmission floating around on here on MB World is from the STAR DVD's that are available from MB. They are not updated like the WIS documents. So, if you look at the WIS document I posted, you can see MB changed a few things on the service. 1)They added shifting the car into neutral before servicing. 2)A new gasket is required now and can NOT be reused. 3)Draining the torque converter is required as part of the service now.

Mar 15, 2014 | 05:18 PM

#144

Kiwi Ed

Junior Member

Joined: May 2011

Posts: 37

Likes: 2

From: New Zealand

2009 MB ML320 CDI

Thanks for the excellent information, I have a 2009 ML320 CDI it has the updated pan + converter drain plug. Had no problem obtaining parts. Couple things to ask - I have access to a digital thermometer with hardwired pobe as used for servicing aircons etc would tape probe to say bottom of pan with foam backed tape, what do you think of this. Which is the return line from the oil cooler thought I might flush a small amount of fluid from here to flush the cooler + lines, like you do on other trans without converter drain plugs to flush converter using alot more fluid of course.

Mar 16, 2014 | 03:53 PM

#145

dave2001auto

Senior Member

Joined: Jul 2013

Posts: 493

Likes: 14

84 300d 2009 e320 bluetec (retired)/, now 2012 E350 4-matic blueefficiency automatic

Quote:

Originally Posted by Kiwi Ed

Ed, If it is calibrated properly, it will likely be more accurate than the IR temperature gun, but not as accurate as the DAS. There's cooling of the metal by the ambient air. The more insulation the better matched to the internal fluid temperature.

I don't know the temperture differential between the fluid and the outside of the aluminum pan. Both are fairly good heat conductors and inaccuracy of the measuring devices. Just make sure there's good contact and some insulation.

Mar 17, 2014 | 02:56 PM

#146

Kiwi Ed

Junior Member

Joined: May 2011

Posts: 37

Likes: 2

From: New Zealand

2009 MB ML320 CDI

Thanks for the reply.

Apr 30, 2014 | 10:46 PM

#147

joshguar

Newbie

Joined: Apr 2014

Posts: 2

Likes: 0

2006 Mercedes Benz E350. W211, AT 722.9

Thank you so much for posting and uploading those pdf files with detailed instructions. They are really very helpful as I determine whether or not I can and have all the tools to do this job. I've been looking for this for a while and most posts are about another transmission which has a tube for filling the ATF. This is very helpful now that I know how to do it without the tube accessible from the top of the vehicle for replacing ATF. Thank you so much!!!

May 1, 2014 | 11:48 PM

#148

W203E35

MBWorld Fanatic!

Joined: Feb 2009

Posts: 5,537

Likes: 8

2006 C350 Sport 6MT

Hi John,

Hope all is well. I'm going to do my transmission oil and filter change this weekend. Your thready is very helpful. Last time I followed it, it was a breeze. This time I'm gonna use the thermometer though.