722.6 Trans disassembly/ rebuild help - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 12-16-2008, 08:26 PM Thread Starter
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722.6 Trans disassembly/ rebuild help

Ok so A friend of mine dropped this trans off for repair.

Trans was said to be slipping. Dissassembling unit for repair need to know how to remove the valve body without destroying the electronics connector.

While I'm at it does anyone know specs for various clutch pack clearances and buildups. Service info.
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post #2 of 7 (permalink) Old 12-17-2008, 05:43 AM
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In all due respect. If you dont know how to take one apart, what makes you think you can rebuild it. The dealerships dont even repair them. The MB dvd does not even discuss rebuilding them, maybe ALL DATA.
If you are a trans rebuilder some parts suppliers have limited information
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post #3 of 7 (permalink) Old 12-17-2008, 09:05 AM Thread Starter
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Well lets see Just finishing up a rebuild on a Ford 4r70w over drive trans, and a 2004 Caravan Transaxle as well as many others in the past.

I've spent 10 yrs as a Diesel mechanic repairing injection pumps and such.

Oh I've also repaired drivetrains in heavy equipment (dozer and excavators) as well hydraulic pumps.

Spent time with the miles (and many hundreds of pounds) of wiring inside a city bus as well as the computors which control it.

You asked and I'm qualified.

I felt someone here may have had a bit of knowledge about this particular unit. The valve body is somehow attached to the wiring harness connector which is unseen from the backside.

In order to perform a proper rebuild the valve body must come out. Shure I can remove it if I use gorilla force then replace the harness after the fact.

When in doubt ask.

Yes Alldata may be one source. I also felt this site could be one of them perhaps a better one.
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post #4 of 7 (permalink) Old 12-17-2008, 09:09 AM Thread Starter
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Ya know what I also worked for a dealership ( not benz ) at one time and I know many places that would perform the same work as well or better in many cases.
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post #5 of 7 (permalink) Old 12-19-2008, 08:38 PM
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There is a guide bushing which connects the wiring harness to the 13 pin connector on the transmission ECU. Once you unplug the connector, the rest of the electronics tray is held onto the valve body by three screws which also hold the solenoid valve leaf springs in place. Remove those, and the tray should lift off. I have diagrams but the file sizes are large.
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post #6 of 7 (permalink) Old 12-19-2008, 08:45 PM
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Quote:
Originally Posted by rapidtransit View Post
Well lets see Just finishing up a rebuild on a Ford 4r70w over drive trans, and a 2004 Caravan Transaxle as well as many others in the past.

I've spent 10 yrs as a Diesel mechanic repairing injection pumps and such.

Oh I've also repaired drivetrains in heavy equipment (dozer and excavators) as well hydraulic pumps.

Spent time with the miles (and many hundreds of pounds) of wiring inside a city bus as well as the computors which control it.

You asked and I'm qualified.

I felt someone here may have had a bit of knowledge about this particular unit. The valve body is somehow attached to the wiring harness connector which is unseen from the backside.

In order to perform a proper rebuild the valve body must come out. Shure I can remove it if I use gorilla force then replace the harness after the fact.

When in doubt ask.

Yes Alldata may be one source. I also felt this site could be one of them perhaps a better one.
Just dont forget you're working with a Mercedes. Good Luck with the rebuild.

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post #7 of 7 (permalink) Old 12-20-2008, 06:21 AM
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I do not know if this will help, but there are a few clips of rebuilding a 722.6. Here is the first:

YouTube - Mercedes 722.6 Transmission - ML 320
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