Help - stuck on road 722.3 no 3rd/4th gear - Page 3 - PeachParts Mercedes-Benz Forum

ps2cho · #31 11-15-2011, 06:00 PM

Nevermind not rust....

OK --- I cannot get governor out completely. I tried pushing the tranny as far over as I could and still not enough space.

I did get a good look at the gear though and it looks perfect.

So all that is left is to try and lock this baby back down. I can "feel" the axial support grab and move about 1/6th of a turn further than any other location I tried, but I cannot get it to go verticle. I can only get it to 9'oclock instead of the disengaged 6:30 position.

Any ideas?

EDIT: nevermind I feel silly its only supposed to be 9'oclock. Looks like I got it! Time to put it back together and see what happens!!! Fingers crossed.

ps2cho · #32 11-15-2011, 06:26 PM

Ok I ran into a little issue that I want to check before going further....

Even though the A/S is horizontal which according to the manuals is correct, when loose it still moves 1/4inch forward/backward. Is this normal? I want to make sure that is normal if anybody remembers or not before tightening and putting it back together...

Or does it not matter because once tight, the nut should pull it outwards anyway?

sba121400 · #33 11-15-2011, 08:37 PM

The governor should not spin freely. It should spin as you rotate the drive shaft, if it rotates freely, the pin on the governor that secures the gear has broken off, making the governor needed to be replaced.

ps2cho · #34 11-15-2011, 11:09 PM

I put it back together and no luck -- still only does 1st and 2nd gear, and it slips between both depending on load.

Back to the drawing board.

It spun when I first removed the cover and the axial support was not locked. After I removed it, rotated it 90 deg and put it back in and locked the axial support, it would not spin freely.
I'm guessing I really need to drop exhaust and remove the entire thing now.

This sucks, but I don't believe I should need to remove the aux pump right? Just the nut for the axial support?

Stretch · #35 11-16-2011, 04:14 AM

Bummer you didn't get it fixed. I'll keep my fingers crossed for you. It be interesting to see what you find when you get it all laid out on a bench.

Merkey · #36 11-16-2011, 01:28 PM

At this stage, I dont think he needs to remove the whole trans.
I am thinking just remove the exhaust from the manifolds, and fan shroud to allow the rear of the transmission to drop. This will allow him to pull out the govenor.
From there he can look at the govenor, and the mainshaft drive gear.
Its not clear from the manuals and diagrams I have seen how the govenor looks and is assembled.
Anyone got pics or knowledge?

I read on one post that the mainshaft gear is plastic... anyone know?
Clearly, if the Govenor is spinning freely, then it has lost engagement with the mainshaft gear... either by being out of place, or a gear is stripped. If the mainshaft gear or Gov gear is plastic, that would be the weakest link.
Looking at the Assembly drawing, it looks like you could replace the mainshaft gear by removing the tailshaft housing... but maybe its not possible

ps2cho · #37 11-16-2011, 02:33 PM

If the gears are broken, will the rear cover need to be removed to replace everything?

And as long as the exhaust is dropped and the transmission hangs down, I should be able to do everything without removing the transmission right?

Stretch · #38 11-16-2011, 02:55 PM

Like I've said before I've not as yet pulled a 722.3 to bits but I think that the construction is similar enough to a 722.1 in the way that the gear set clearances are all measured and adjusted from the rear of the transmission. If you remove the back end part of the casing you might (just might!) find that the gear set tries to slip out of the transmission if it is hanging down under the car at an angle. This could cause you more trouble that you don't need. Even though it seems to be more work I do advocate transmission removal at this stage just in case. I also think you'll be able to see what is going on better - it will probably be easier to work on too.

whipplem104 · #39 11-16-2011, 04:01 PM

You can do this in the car. Normally the gear on the output shaft does not break on the .3 only the .4. Undo the nut on the shaft to the aux pump. It turns just a little. Remove the snap ring from the governor cover and remove the cover. If the transmission is lowered enough it will come out the side. You might have to pry the transmission over to the side a little to make room. If you have to remove the output housing it is ok. There are shims just put it back together the way it came apart. It is a fairly straight forward stacking of components.

Merkey · #40 11-16-2011, 04:31 PM

Awesome, Whipple, thats what I thought.

If you have pulled one out, based on the what we think happened, is it possible that the gear just moved out of position without the Axial support engaged?

ps2cho · #41 11-17-2011, 11:18 PM

Found a great thread with some photos of the rear end although its a 722.4...

722.4 does NOT have a 2nd pump right?

Does the 722.4 use a plastic gear while the 722.3 uses a metal gear?

Successful 722.4 rebuild

I'm gonna be dropping it down Monday and should know by the end of the day what actually happened once I can see inside and have the governor in my hand.

If I need to remove the rear cover, looks like I need a 30mm 12pt deep socket to remove the nut?

ps2cho · #42 11-21-2011, 03:18 PM

Looks like you guys hit nail on the head

Got the transmission down low enough to get the governor out. Governor is definitely munched. Looks like the main gear is munched too -- think so also?

Some metal shavings, but I am gonna have remove the rear cover anyway. I will replace fluid and filter and magnet out anything in rear cover. I think since I only drove it a mile when it blew its probably okay. I'll assess when I get the cover off to see if its just shavings or chunks like the photo:

ALSO -- No snap ring that you have to press in that the diagram shows. Its missing completely!

compress ignite · #43 11-21-2011, 03:50 PM

1.Had/Has Plastico Gears.
2.Early models HAD the second (Rear) Pump.

The 722.4 is the "Poor Cousin" of the 722.3.
(ANY Cheap,semi-functional part they could squeeze inside the casing they did.)

Stretch · #44 11-21-2011, 04:05 PM

Have you got any quotes for the cost of a replacement governor yet?

ps2cho · #45 11-21-2011, 06:08 PM

They want $289 for governor and none in the U.S.A either -- Germany shipped! so looks like ill find a good used one somewhere....

EDIT: Also good news...I can check out the speedometer gears since my speedo wobbles and replacing the cable did nothing (replaced cable 3x in fact!!)