I have taking apart the main gear today and the plan is to change two o-rings at the F1 sprag clutch (one-way clutch). I made one mistake with the arrangement the main carrier (silver) fall down on me I was surprised but nothing happened you need another arrangement.

ATSG side 65 (722,5 ATSG paper book) is where I started from the disassembly you start from input shaft K1 too take it apart. No problem so far but I put it together some other day. Still waiting for the new lip seals I think they are the one that give me most concern. Might do the magazine cover trick. I made a plastic but it was too sharp cut the lip seal.

I hope I do not cut my lip seal, but I did replace the two o-rings in the planetary gear box, yet I had to use some wood working clamps to place the clip in, and the rear of the transmission served as an assembly jig.

Nice when the seals are labeled my overhaul kit there is no label anywhere that's why I keep them on so I can compare them with the new ones.

I'm keeping my old parts for comparison as you can see in the photo with the package, and the old parts in my hand.

Do not forget these on the shafts.

Martin

You guys are doing a great job on this thread - well I'm enjoying it anyway - keep up the good work.

Very important information in my opinion - every little bit helps to myth bust the whole "automatic transmissions are way too complicated" attitude many people have.

I'm particularly interested to see how the auxillary pump and the governor come apart and than back together - all in good time - when you get to that bit of course...

And I thought no one was interested. This unit have no aux pump and governor you only remove the cover and turn the governor so you have a good look at the locking ring and then you take a locking ring plier and hold the locking ring together and pull out the governor.

Ah that's excelent - thanks.

There was a member on this forum who had trouble with his 722.3 transmission in this area (similar in design to your 722.5 if I'm not mistaken)...

...his problem was related to a stripped shaft...

...have you actually removed the governor?

Er if you haven't - be warned you might have some trouble getting it back in and working properly.

I'm not sure what exactly went wrong - I still haven't started on my 722.3 strip down so I can't tell what the problem could have been.


Oh and please note just because nobody is joining in now, it doesn't mean you are wasting your time. Not many people here have 722.5s but those who do will probably thank you for your efforts in the future.

Army,

I like your motto on myth busting the attitude of "Transmission Repair", and many think once the transmission fails it is time to get rid of vehicle; Many great vehicles can be found for a super bargain for sale with transmission problems, but 10 years ago I was one of those who got rid of the vehicle when the transmission failed. I took the motto of what a close friend said "once it breaks-down I cannot break-it more by fixing it!"

Why not fix it? The "buy-in" on parts was only 220 USD a 10th to 15th the cost of paying the cheapest service center.. plus I would come back with wealth of knowledge!! What is knowledge? POWER in these times, so the risk worth the gamble...

On the 722.5, I wish my 1996 S320 did not have the 722.5 as the aftermarket replacement parts vendors are only a few in the USA, and the aftermarket literature is full of holes in the process', and the diagrams are missing, or have to many parts on them. Spit64 needed help with clear cut process to dissemble the 722.5, and I'm glad I had dissembled mine. I am soooo happy here in the USA we have Mercedes-EPC for parts look-up which is great help to qualify the repair process because the parts are exact to vehicle's VIN serial number.

As you can see, the 722.5 DOES NOT HAVE a secondary/auxiliary pump.

About the assembly, from my view, The problem will come from two spots:

1) The free-floating clutch pack on the outside of front the planetary gears

2) installing the K2 is a real pain, and hard to line-up with the planetary gear case

I talked with a 18year old kid that never repaired a transmission. Repaired a 722.5 if he can do it. I too have the same opportunity, so I'm fearless on this project..

Martin

Army is not the only guy watching. I agree that a lot more of us should DIY these ( I have done a 722.315 and a Ford C4) and keep these fine cars out of the junkyards. It's really not rocket science. Just takes some patience.

Hi Martin,

I don't know for sure if you need to make that three spots or not.

ps2cho had trouble with the secondary pump-to-governor shaft in this thread

http://www.peachparts.com/shopforum/tech-help/308281-help-stuck-road-722-3-no-3rd-4th-gear.html

Now I don't know what went wrong with his 722.3 but I'm a bit wary of that part of the transmission now. If you go towards the end of the thread you'll see what I mean about trouble - it was fitted and refitted several times and it would not stop making scary noises!

Now as you say the 722.5 - whilst it seems similar in design does not have the secondary pump - so it might not have the same trouble.

I'm planning on doing some investigations of my own on a spare 722.3 that's been lying in my garage for over a year now...

...but it has already been there for one year and I've got a lot of other stuff to be getting on with - so don't hold your breath!

Nice one rs899 - they just need a bit of moral support once in a while - spit64 mentioned that he thought no one was interested.

WE ARE!

^^ Even if nobody is watching realtime you know there's going to be someone out there who's driving a Buick now and won't be buying a MB with a 722.5 in it for 5 years. But he will find this thread when his gearbox goes tits up.

I like that lip seal tool. Simple.

This is GOLD - If my E300D trans decides to pack up I will take it to bits, currently at 115K it shifts smooth and the fluid is a very pretty pink.

Army,

My governor looks great, but on 722.5 is a measurement for the output shaft for play on the output shaft. Again, we are all learning here. I would have shot-gun the soft parts when the rear case was taken apart in the case of ps2cho. On the 722.5 my clutches are very worn on the rear of the transmission, and maybe the o-ring(s) on output shaft(See post 42) failed? if it is similar to ours?

Rss99,

Thank you for the fan-fare...My transmission is pieces, but I have not officially started to rebuild it. I sort of jumped in to help Spit64, but I guess I opened my trap-door...

Zulfiqar,

Well, I got a little squashed on another thread on here on this forum When I said a typical 722.3-722.5 lasts around 120k-170k miles. I do stand behind that as I'm just W140 fan and I really care less for the other models. W140's are everywhere with transmission problems are occurring at 140k miles. The W140-the heavy-land yacht that is very hard on transmissions, and is full of electrical nightmare of problems.

I think you will do fine on your E300, but my 722.5 was very very worn out of many of the soft parts. I do live in the Western US where its hot,but to extend the life of my current rebuild. I will install a large transmission cooler.

Army here are my governor pics:


Enjoy all,

Martin

I have got myself a tranny fluid cooler - not installed yet, to help elongate the life of the transmission - the E300 cooling system has the heat load of the engine, the oil cooler and the transmission itself.

I believe it should help me get more than usual miles out of it.