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Old 05-16-2009, 02:02 PM   #1 (permalink)
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change transmission fluid 2006 E350 (722.9)

Hi,

We have a 2006 E350 with the 7-speed transmission (722.9) sealed transmission that needs to have the fluid changed.

I've been trying to find out how this could be done and I'm somewhat confused. Perhaps someone could help straighten me out. I've found a lot of information about the 5-speed (722.6) transmission but not much on the 7-speed transmission.

It sounds like all a dealer does is to drop the pan, replace the filter, and add whatever what was in the pan without doing anything to flush the torque converter. This doesn't seem like the right approach.

It seems like a reasonable approach would be to drop the pan, change the filter, and use the flush technique where a liter of fluid is pumped out and then replaced. Can this be done on the 722.9? Is there a dipstick option for that transmission?

If not, I discovered that Assenmacher has an adapter for adding transmission fluid to the 722.9 (or a kit that has the adapter and a hand pump). Would it be needed to replace the fluid?

As far as I can tell, the transmission needs to be at operating temp to check the level. It seems like this could be ascertained by using an external temp device.

Any comments or ideas?

Thanks,
Richard
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Old 05-16-2009, 10:35 PM   #2 (permalink)
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722.9 Tranny Service Procedure...

Check out this link ... talks about 722.9 and 722.6 Tranny...


http://www.benzworld.org/forums/w211-e-class/1438555-cost-transmission-flush.html

This link details the 722.9 Tranny Dealer's service @ $400 !!!
http://www.benzworld.org/forums/w209-new-clk-class/1442034-7-speed-auto-gearbox-atf-change.html

So what do you think?
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Old 05-17-2009, 08:21 AM   #3 (permalink)
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Thanks. The references were helpful but I'm still confused. My goal is to get the transmission fluid change done right and be sure it was. I use dealers for lots of things but this seems to be an area where they are doing a variety of things which may not be the right things to do.

Part of my problem is that it seems the dealers don't really change the fluid, they drop the pan, change the filter, and replace whatever fluid was in the pan. This doesn't seem like the right thing to do and can't be all that hard for a DIY.

If the desire is to change more of the fluid then it gets harder. Here is seems that the dealers use the BG system and often use the BG chemicals. Is this approved by MB? It isn't clear but seems unlikely. If they do it this way, they don't change the filter.

So, if you're anal about these sorts of things (I am), how does one get the fluid out and have the filter changed? It isn't clear that the dealers have this figured out so DIY looks like the best way to get it done. (If I'm wrong about the dealers, I'm certainly willing to go that way.)

So, if I want to do it myself, how is it done without all the expensive MB special equipment? There was a mention of starting the car and letting the transmission pump the fluid out of one of the cooling hoses. If one did this, the fluid needs to be replaced. Assenmacher makes the adapter needed for the 722.9 transmission to add fluid (and has a kit that includes it and a pump). So, will pumping the fluid out via the hose and pumping new fluid in via the Assenmacher kit work? If so, if I measure what comes out and pump that amount in, is that OK? It seems to me that this should work, but I'm not sure.

Some of the links talk about measuring the fluid at specific temperatures using the MB Start Diagnostic system. If this is needed, can't that be done via a non-contact external measurement rather than using the Star Diagnostics and computer? How critical is it to monitor the temp if about the right amount of fluid is replaced?

I hope this helps explain my quandary.

Thanks again for any help.

Best regards.
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Old 05-17-2009, 11:47 AM   #4 (permalink)
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Fluid change for the 7-speed trans (722.9) CANNOT be performed DIY. Period.

Requires special tools, as fluid is drained and refilled from the same place.

Take to dealer and specify they use the recently upgraded fluid, i.e. 236.14.

You know that for $18 you can subscribe to WIS for 24 hours and print out the procedures. When you read them I'm pretty sure you'll give up trying to do this yourself.
http://www.startekinfo.com
Mercedes-Benz Operating Fluids-Extranet
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Old 05-17-2009, 09:10 PM   #5 (permalink)
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oh... sorry... the link did not work ... here it is again: W209 New CLK Class - Page 2 - Benzworld.org - Mercedes Benz Discussion Forum

Click on the topic: 7-Speed Auto Gearbox ATF Change

But Ikchris has the right idea: go download the WIS to get the correct procedure.

That said, I don't see why the Assenmarcher pump could be used to replaced the ATF removed via the front radiator line, assuming that it has a graduated reservoir so an exact amount can be pumped back into the Tranny? Of course, the tranny would have had the filter replaced before starting the procedure and would then have to be warmed up and monitored by an external Infrared Temperature gun.

Let us know if you do this... please document and post here!

Good Luck...
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Old 05-18-2009, 09:12 PM   #6 (permalink)
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Here's Assenmarcher Tranny pump for Mercedes 722.9

http://www.asttool.com/detail_page.php?tool_number=ATF%201007-5%20EURO

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Old 05-19-2009, 10:47 AM   #7 (permalink)
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This is the pump/adapter I was thinking of (ATF 1004-5 MB). It's specifically for the MB transmission and a little cheaper than the Euro kit. Is there any reason to get all the adapters?

AST
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Old 05-19-2009, 01:38 PM   #8 (permalink)
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2006 had the 7 speed

thought that was last year for 5 speed, im probably wrong.....
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Old 05-19-2009, 01:53 PM   #9 (permalink)
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Post

Quote:
Originally Posted by BlackOpalCDI View Post
2006 had the 7 speed

thought that was last year for 5 speed, im probably wrong.....
2006 CDI has 5 speed, others in 2006 have 7 speed.
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Old 05-19-2009, 09:49 PM   #10 (permalink)
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There is no reason to get the other adapter unless you want to service a BMW and other makes....

Did you get the WIS procedure downloaded?

So what do you think?

What are your plans?

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