Allis 7000
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=210089
Printed Date: 17 Feb 2026 at 11:30am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis 7000
Posted By: Empirestate
Subject: Allis 7000
Date Posted: 16 Feb 2026 at 5:56pm
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hello all, New member here. Been a lurker for a while and have gleaned a lot of useful information. Now I have a problem I could use some help. 1978 Allis,7000. It does not have differential lock, but all of a sudden it acts like it does. Just driving tractor only it steers, but with a round bale on the 3 pt. You can't turn it, not even using the breaks. I suspect something is wrong in the final drive, but what? Thanks for any help Bob
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Replies:
Posted By: DrAllis
Date Posted: 16 Feb 2026 at 6:18pm
| The differential is locked up. There is a dipstick directly behind the cab under the SMV sign. I'm guessing your PTO seals have been leaking oil and that compartment is very low on oil. Wheels have to come off. Axles get pressed out of their tubes. Brakes/brake housings come off. Lift arm housing comes off next. Then, you are down to the differential with the ring gear. Cab might have to be lifted a little, but not removed. |
Posted By: Empirestate
Date Posted: 17 Feb 2026 at 4:56am
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thanks Dr., Are we talking major damage or parts not sliding as they should? I did pull the dipstick, it was low but Still showed oil on the stick. Thanks again, Bob
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Posted By: Empirestate
Date Posted: 17 Feb 2026 at 5:05am
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dr. Allis, I should have asked am I going to do more damage if I were to keep using it? I still have to feed cows Until the weather improves, also don' t have heated shop.
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Posted By: DrAllis
Date Posted: 17 Feb 2026 at 6:28am
| More damage?? Maybe and maybe not really. The affected parts are already junk. If you must continue to use it, overfill it 2 or 3 gallons from the top mark on the stick. Maybe even overfill with diesel fuel to act like penetrating oil inside the differential. It will not hurt doing this. |
Posted By: Empirestate
Date Posted: 17 Feb 2026 at 6:32am
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thanks dr. Won't use more than I have to . What am I looking at for ruined parts.
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Posted By: DrAllis
Date Posted: 17 Feb 2026 at 7:38am
| Four seized pinion gears inside the differential case and a ruined cross at a minimum. I only remember having to repair one over the years and it had 6K+ hrs on it and had done a fair amount of plowing in its iifetime. |
Posted By: Mikez
Date Posted: 17 Feb 2026 at 7:43am
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Welcome to the forum. Goodluck. Where abouts are you located
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Posted By: Lynn Marshall
Date Posted: 17 Feb 2026 at 8:21am
This is the differential carrier from an 8030 a few years back.   
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Posted By: DrAllis
Date Posted: 17 Feb 2026 at 8:23am
| That's pretty cool, Lynn. For sure when he placed it in "park" on a hill it rolled another couple of feet !!! |
Posted By: Les Kerf
Date Posted: 17 Feb 2026 at 8:26am
Yikes!  |