What I found in my G differential

Hello Forum Members,

This is my first post ever and my first tractor project. I recently purchased two Allis Chalmers G tractors. One is being converted to electric. I appreciate keeping things original, but I'm OK with this electric modification. I enjoy the sound of a diesel or gas engine, but I think it would also be nice to operate a battery powered tractor. I like the fact that old tractors are still around and regular people can work on them. Thanks to the members of this forum who share their knowledge and experience with others.
Please know that I am not a mechanic. When I'm not puttering around my small farm I'm probably installing and repairing surgical lasers to pay the bills.
I downloaded a copy of the G service manual and started cleaning things up. I really like looking into a 70 year old tractor and seeing gears that look brand new.
I'm hoping you can look at the following pictures and offer some advice.
The first picture shows a metal ring that I found in the bottom of the differential case. I thought it might be something to attract metal debris but it's not magnetic. Next thought was maybe this is part of a rubber seal. I don't see anything in the parts diagram that looks like this.
Second question is why would someone need to tack weld the main drive gear? I guess the obvious answer is to try and hold it in place. I'm thinking it didn't leave the factory like this. Does anyone have thoughts on why this is tack welded? If it's not right I would like to fix it.

Thanks,

John

The round thing is a spring that goes
around the lip of a shaft seal, whether rubber
or rawhide, to hold constant pressure. I
bet the seal came apart upon removal and
the spring fell in the housing. It is
unlikely it belongs on one of your working
seals because the shaft would have captured
it.

I have a couple of Gs, fun to play around with. I agree with Blue on the spring. Is that gear in the transmission? My guess is that it was loose on the splines and somebody did a halfa$$ed repair. Gs were prone to breaking axle shafts. I broke on turning with the brakes while mowing. The splines in the differential twisted off.

Looking at the weld job on the gear, I'm wondering if that was done in place of a snap ring to keep the gear in position on the shaft.

If the spline is stripped in the gear or on the shaft, I sure don't see that weld being able to hold much!

I agree wuth you Blue. That is one of them spriny things. Goes on the rubber lip of an oil seal.

looks like snap ring was missing and were to lazy to take apart and fix right

is that a torch cut above the gear ?

(quoted from post at 19:07:20 03/24/18) is that a torch cut above the gear ?

Click to expand...

Thanks for all the replies. You are correct the welds are all cracked. No way they were going to hold much. Thinking it would be best to remove the gear and take a look at the splines. Will also be looking for a snap ring. The odd arc on the housing is not a torch cut, but it did get my attention. It looks like I can clean it up at get a good surface for a gasket.

I would try to buy the shaft before you take it apart.
Probably available, but maybe not.