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Empirestate 
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Joined: 15 Feb 2026
Location: CNY
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 Topic: Allis 7000
Posted: Yesterday at 5:56pm |
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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DrAllis
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Joined: 12 Sep 2009
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Posted: 22 hours 58 minutes ago at 6:18pm |
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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.
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Empirestate
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Posted: 12 hours 20 minutes ago at 4:56am |
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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Empirestate
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Posted: 12 hours 11 minutes ago at 5:05am |
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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DrAllis
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Posted: 10 hours 48 minutes ago at 6:28am |
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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.
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Empirestate
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Posted: 10 hours 44 minutes ago at 6:32am |
thanks dr. Won't use more than I have to . What am I looking at for ruined parts.
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DrAllis
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Posted: 9 hours 38 minutes ago at 7:38am |
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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.
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Mikez
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Posted: 9 hours 33 minutes ago at 7:43am |
Welcome to the forum. Goodluck. Where abouts are you located
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Lynn Marshall
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Posted: 8 hours 55 minutes ago at 8:21am |
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DrAllis
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Posted: 8 hours 53 minutes ago at 8:23am |
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That's pretty cool, Lynn. For sure when he placed it in "park" on a hill it rolled another couple of feet !!!
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Les Kerf
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Posted: 8 hours 50 minutes ago at 8:26am |
Yikes! 
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Empirestate
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Posted: 1 hour 46 minutes ago at 3:30pm |
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thanks again DR., i'll post back in several weeks when I get it apart. When weather allows. I'll try to use a different tractor if it will pick them. Mike , I'm in the southern finger lakes area.
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