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Subject: Jubilee differential, Weak Spot?

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Jim Dandy    Posted 08-14-2020 at 08:45:59 [URL] [DELETE]        [Reply] [Email]  
  • Jubilee differential, Weak Spot?
  • Two days ago while ripping hard soil with a box blade the rear end of my Jubilee pretty much disintegrated! Well, something broke inside and I managed to drive it in reverse out of the field which, according to the mechanic completely destroyed the rear housing & most of what was in it.

    He told me that the pinion gears on those models are a weak spot, now I have no reason to doubt him especially since they specialize in repairing old Fords but hearing that broke my heart almost as much as hearing what it's gonna cost to repair my rig!

    Anyhow, I was wondering if anyone else knew anything about this Achilles heel?

    Kirk-NJ    Posted 08-15-2020 at 06:07:34 [URL] [DELETE]        [Reply] [Email]  
  • Re: Jubilee differential, Weak Spot?
  • About 4 months ago I bought a trans off a guy in Maryland. He still had the rear. if you are close to there I can see if I still have his number. BTW an 8n rear will bolt right up to an NAA trans. You would lose you live hydraulic but it is another option. Here's my NAA with 8n rear.

    Jim Dandy    Posted 08-15-2020 at 06:31:19 [URL] [DELETE]        [Reply] [Email]  
  • Re: Jubilee differential, Weak Spot?
  • Thanks for the offer but I think that I'll try to keep this one original as much as possible.
    I owned a Jub back in the ninties that had a 8N rear, used it alot with no problems.

    Ultradog MN    Posted 08-14-2020 at 17:42:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Jubilee differential, Weak Spot?
  • I'm sorry to hear about your tractor.
    May I ask what they quoted you to find the parts and repair it?
    Also, is this a family heirloom that you really want to keep?
    How good is the engine, tin, tires, paint, etc?
    Fwiw, you could just find a 600, 601 or Prior 2000 transmission and rear end and graft the front half of your Jube onto it. Everything would be pretty much a direct swap and likely not much more costly than finding the parts and fixing yours. You'd get some upgrades - more robust gears in the rear end, better rear axles, better hydraulic system.
    If your tractor is just a worker that may be the way to go. You might even find a rear half with a 5 speed which would be nice or better yet, a 5 sp with live PTO.
    Things to think about...
    If you were really strapped for $ I have seen photos of a 2N rear end grafted onto the back of a Jube transmission. I do not know what all that entails but believe it is possible. You would lose your live hydraulics, drawbar and position control. I don't know if you could do that with an 8N rear end. Someone here might know. Then you could save your drawbar and position control.
    Just some rambling thoughts here.
    Hope they give you some ideas.

    JimDandy    Posted 08-18-2020 at 19:16:44 [URL] [DELETE]        [Reply] [Email]  
  • Re: Jubilee differential, Weak Spot?
  • I have not responded to your relies but I have read them all and they have helped me make what I think is the right move.
    Rather than fix the Jubilee I sold it (basically for parts), and bought a 57 860.
    While it's definitely taking some time getting used to this new little monster I believe this machine is much better suited to my type of applications.
    Thanks guys!

    steveVa    Posted 08-14-2020 at 12:31:22 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Jubilee differential, Weak Spot?
  • I would start looking for a used rear half. Fixing the old one will cost you dearly.

    Dean    Posted 08-14-2020 at 10:56:45 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Jubilee differential, Weak Spot?
  • Yes. The pinnion support is the weak spot in 8N and NAA rear axle assemblies.

    This issue was addressed in the 6/8** series tractors introduced in 1955.


    Gaspump    Posted 08-14-2020 at 10:29:36 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Jubilee differential, Weak Spot?
  • Wouldn't call it an Achilles heel but it is a weaker point in the drive train. Designed to withstand normal usage at the rated HP, 60+ years of use adds a wear factor also.

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