7050 not moving

Got a 1975 7050 that was working the other day in 4th gear, High on floor, Low on side lever when it stopped abruptly making a mild rumble.  Looked it over, PTO in rear worked, Steering worked, 3pts worked, and remotes worked. When you pushed the button on the floor the clutch would pop it out. Everything worked but movement and when you tried to make it move the engine would pull down hard and did the same in all gears and high or low on both buttons and side lever. We split the tractor and pulled out the power director. We jacked up a rear wheel  and attempted to turn with a bar but could not budge it, when the transmission was put in neutral it turns freely. We pulled the main shaft out and it came out easy, splines were good on both ends of the shaft as well as where they inserted.  Before doing any more disassembly, I would like to know if the PD High and Low Range Hollow Shafts should turn, either one or both?  Neither have any movement no matter what you do and I am a little suspicious? I have not done anything to the PD but with it out I was making sure there wasn't an issue behind it and not being able to turn anything in gear with a bar on a wheel makes me think that is likely where its at. Does anyone know if either hollow shafts should move? Any thoughts or suggestions on what to do next would be appreciated, Thanks

With the 5 speed transmission in neutral, both hollow shafts should turn together BUT at different speeds.

I am confused, you said it stopped and would not move - did it choke the engine down ? You say 'when I try to MAKE it move it chokes down' .  early 7030 7050's had an issue gaulding /seizing the 3d/4th gears to the shaft. IF everything works and the unit will not move the female splines in the PD hub have rounded out. The symptoms you describe we have encountered but the ones that siezed the shafts would not roll in gear as it is in 2 gears at once.  IF your tractor stalled and the engine kept running not lugging down indicates 2 issues..

I am still working on it, the only thing I can see is the two hollow shafts do not turn and the very slight amount they will rock back and fourth, they both move together, it not a lot, just like slop from wear. What could lock the two up? Thanks

With the 5-speed trans in neutral, you should be able to grab onto either of the top hollow shafts and turn them. Use one of the hubs out of the P.D. clutch to help, but they should rotate the same way, just one 20% faster or slower than the other one.

What if you pull the floor of the cab and then pull the top of the transmission.

Then you can have a good look at the the gears. - galling on shaft or chipped teeth, etc.

You should be able to move them (shift) by hand back and forth.

Or get a camera scope to look in from the bottom, although its not as good.

Yes, I have done all that. not much wear, everything looks good and moves freely by hand. The two hollow shafts being stuck seems to be the problem but I can't figure out where they are stuck, thanks

That hollow shaft stuff has always me think- what grade metal was in that shaft to be strong enough to keep it all together? I do understand that just a little bearing faiure would wipe it all out l

I think you are right about the hollow shafts being welded together, although I do not see any discoloration from heat.  It appears from the big parts book you got to remove the entire transmission to get those things out? Maybe I am missing something but that is how I read it? Thanks

Yes, if you are working on the transmission, you need to pull it out.

I have pulled mine out with no previous experience and changed two gears that were chipped.

A transmission stand on wheels is necessary. Then you can roll it to the side and pull it completely apart.

Thanks everyone, I got the two hollow shafts out, I had marked them with a paint pencil and I can slightly rotate them so I am going to try to get them apart.  I have called all over and the Allis Chalmers people left say they are obsolete and  salvage ones are pretty rare too.  Is there any way I can put the thing back together with only the low range? I am a very small farmer and its not going to be used much so if I could just get it to work I would be happy. Any thoughts? Thanks

I got them out as a unit, I was able to slightly turn them separately with huge force while still in transmission but when I got them out they are still stuck together. I have spent the last 2 hours trying to get the inside and outside hollow shafts apart. I carefully blocked it in a press and gave it pretty good pressure and was amazed it didn't separate. Here is a picture looking inside with the cage  bearing out where the gauling is. Any ideas how to get them apart? Thanks

So Doc was there an improvement made in the later models or why the change?

Glad you got it to cooperate !!   To answer Allis Freak's question: The beginning of the 7000 series was the 7030 and 7050. They were originally supposed to have a custom version of an Allison power shift transmission, but that didn't happen, so A-C designed their own. In the meantime, the Power Director transmission was conceived and unfortunately it only had about 15 speeds out of 20 possible selections. Some engineer must have had a bad battery on his calculator. So, when the second generation 7000 series came out (7040-60-80) they corrected that mistake and had 19 speeds out of 20 choices. That's why these input gears are unique to the 30-50 models.

I think that I have a set of those gears for a 7050 if you are interested.