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Freeing up rust frozen bush hog shaft slip joint

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Henry

01-04-2000 19:54:00




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Recently got an old JD bush hog along with a 420 tractor that had been left out on the ground for some years. Amazingly it's in pretty good shape but the square shaft won't slip even after soaking with penetrating oil. Wondered how much abuse the u-joint yokes will take in trying to pull or press it into moving? Anyone have any tips on how to persuade it to move without major damage? As a newcomer I've enjoyed the comments and gotten some helpful information. Thanks

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Burrhead

01-05-2000 15:23:25




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 Re: Freeing up rust frozen bush hog shaft slip joint in reply to Henry, 01-04-2000 19:54:00  
Soak it and beat the heck out of it. Beat it all along the length, and not just tap in same spot. Heat won't hurt it and if it's frozen up in a position so you can hook it all up to the pto and spin it after you've beat it severely..
Put pto in gear and go drink a cup of coffee while it's turning. Usually no matter how hard I've had them freeze, it would free back up after soaking and beating, with spinning.
If it don't free up right away get back on it with the hammer, once the rust breaks a little it will grind the rest of the rust out. Most times they're not froze up as solid as they seem.

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Ninh Hoa

01-05-2000 07:50:53




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 Re: Freeing up rust frozen bush hog shaft slip joint in reply to Henry, 01-04-2000 19:54:00  
I'm with Tom S....use a torch. Heat up the outside tube. You might have to do it a couple of times. After it cools, use your penetrating oil or silicone. It works for me.



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Steve Hansen

01-04-2000 21:57:12




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 Re: Freeing up rust frozen bush hog shaft slip joint in reply to Henry, 01-04-2000 19:54:00  
I would not put any pressure on assembled u-joints. If you want to press, I suggest you take the u-joints apart and press on the centers, that is directly in line with the tubes. A better idea is to get a couple of logging chains. Wrap one around each end and secure to your tractor and someting that will not move. A couple of relatively easy jirks may get it free. Be carefull. The harder you try, the more dangerious this becomes. If this does not work and you are not in a hurry, I would suggest drilling a 1/4" or 3/8" hole near the u-joint on the outer tube. Put the inter tube u-joint end in a bucket and flood the tubes (through the hole)with penetrating oil or kerosene and let it sit. Your problem may be rust but I'll bet it is hardened grease or perhaps a little of both. The kerosene will soften the grease. In a month or two you should be able to make it move.

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paul

01-05-2000 01:30:18




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 Re: Re: Freeing up rust frozen bush hog shaft slip joint in reply to Steve Hansen, 01-04-2000 21:57:12  
Another thought is to lightly hammer or rap the outer tube to jar the rust loose. Rap it along the sides, top to bottom, rotating as you go, several times. That will flex the outer tube a bit, allowing the penetrating oil to get in & do it's job.

--->Paul



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Tom S.

01-05-2000 06:07:13




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 Re: Re: Re: Freeing up rust frozen bush hog shaft slip joint in reply to paul, 01-05-2000 01:30:18  
You might have to take the torch and heat it up also. Tom S.



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