Farm Equipment - Black Belly 7000 Input Shaft leak...again

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Black Belly 7000 Input Shaft leak...again

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=14699
Printed Date: 03 Feb 2025 at 7:09am
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Topic: Black Belly 7000 Input Shaft leak...again

Posted By: Hurst
Subject: Black Belly 7000 Input Shaft leak...again
Date Posted: 04 Jul 2010 at 9:49am

Ok, so I just got home the yesterday around noon (woke up in the middle of the night at 2:45, couldn't fall back asleep, so I left Philly about 4 hours earlier than I had planned lol) and was shown that my tractor is still leaking from the torque tube area. I still need to take a closer look at it with the inspection plate off, but it is all running down the rear part towards the input shaft seal, so I think I can safely assume it's that (plus, the oil is not dark at all), but I am definitely going to double check.

My Question is what would cause this seal to go out already? I used two lip seals in it last summer when I redid the input shaft seal, and the tractor doesn't have 120 hours on it since then. I am thinking that maybe the needle bearing is out that holds it, but after batwining yesterday, it seems to be worse when the PTO is engaged. I don't know if this would be because the 20 foot batwing is putting more load on the input shaft and if that bearing is getting sloppy, allowing it to move more, or if that PTO clutch pack could have a blown seal and be spraying oil past the input shaft seal. Anyone have any experience with this problem? Let me know if there's any more information that would help.

Hurst

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1979 Allis Chalmers 7000
5800 Hours

Replies:

Posted By: Joe(TX)
Date Posted: 04 Jul 2010 at 9:56pm

Your input shaft bearing or clutch pilot bearing may be bad, or possibly the input shaft itself is bad.

This is assuming the seal is installed with the lip turned the right direction.

It's not likely the pto has anything to do with it.

Posted By: 7060
Date Posted: 04 Jul 2010 at 11:06pm

The input shaft may be worn where the seal runs on it. We kept putting seals in our feederhouse gearbox on our combine every couple hundred hours, and it was the shaft being worn. Ive heard that using a rawhide seal makes them last longer if the shaft isnt quite right. If it was easier to get to I would try driving it in a little more or not quit as much if that was the problem, not saying it is.

Posted By: Hurst
Date Posted: 05 Jul 2010 at 11:27am

I soaked the breather cap in some solvent today, as it didn't seem to be letting any air past. Now that seems to be working better. It wasn't leaking while it was idling and I was changing implements, but the oil probably wasn't too hot yet and the PTO wasn't on. I'll check it after baling today and see what I have. I double sealed it last night so I for sure would have at least one seal that wasn't riding in the same place as the old seal. I also was going to use a speedy sleeve, but I don't see any way of getting one onto the shaft, so I didn't do that. Thanks for the tips.

Hurst

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1979 Allis Chalmers 7000
5800 Hours

Posted By: Gerald J.
Date Posted: 05 Jul 2010 at 2:17pm

Sometimes it takes turning the shaft, welding it back up, and then grinding back to the original size.

Gerald J.

Posted By: Amos
Date Posted: 05 Jul 2010 at 5:51pm

I have used speedy sleeves where the shaft was scored or worn down before to stop seals from leaking. Sometimes they are not the solution in all places.

Posted By: Hurst
Date Posted: 05 Jul 2010 at 6:34pm

Well, after using it today, it's the same as it seemed before. When idling when I first start it up and hook up the equipment, it doesn't leak a drop. When I am in the field with the PTO on for a while, it leaks. When I drive it back with the PTO off, the leakage seems to stop (drips very little, seems to just be residual oil dripping off the cover). The thing I that got me thinking about the bearing in that cover is the fact that the tractor ususally only gets a lot of strain on the input shaft when the PTO is engaged (no tillage work for the most part, just pulling larger PTO implements), so if it was going to flex a little under load, that would be the time. This thing has me stumped right now. I need to start looking at the breakdowns in the repair manual and see what all there is to the set up (including how hard it is to get the input shaft out if I end up needing to turn it down and build it back up).

Hurst

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1979 Allis Chalmers 7000
5800 Hours