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Allis Chalmers Discussion Forum
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WD Pto

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B. Jones

07-03-2006 18:07:29




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My step-father has an old WD that he uses on an old brush hog. Under the belly of the tractor is a colar that has a sheer pin through it. He keeps sheering off bolts in this colar I think. How hard of a bolt should he use? I think he is using regular bolts. Should he be using some type of special bolt etc? I have not seen the tractor and am going by his discricption of the problem. Thank you for any help on this problem. B. Jones

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Brad W wi

07-04-2006 05:03:25




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 Re: WD Pto in reply to B. Jones, 07-03-2006 18:07:29  
Talking from experence. I just had to replace all the gears in my PTO.There is a shouldered bolt in that collar your talking about. I don't think it's a shear bolt. On my brush hog back by the gear reducer,there is a grade 2 bolt. Believe me when I say don't go any heavier. If your shearing to many of them off there may be another problem. There should not be any of the threaded portion of the bolt in the collar area. I have a A/C brush hog behind my WD and I'm going through brush and small trees up to an inch or so. I do go through some shear bolts but no more than I would think I'd go through.Take it slow and watch out for rocks and stumps.It's easier than working on the pto.

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B. Jones

07-04-2006 04:25:37




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 Re: WD Pto in reply to B. Jones, 07-03-2006 18:07:29  
Thank you so much for your reply. I will have him try the longer bolt. What you said does make sense. I had never thought about that. B. Jones



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Brian F. Williams

07-03-2006 19:01:37




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 Re: WD Pto in reply to B. Jones, 07-03-2006 18:07:29  
I do not know if this will help but here is my opinion. I believe that the bolt is supposed to be a grade 2 bolt. I have heard that there was a special bolt with a shoulder that was used originally, I may be incorrect with that though. I did however have an old brush hog that I used a few years ago that had a shear bolt on the PTO near the gearbox. I was always shearing bolts even when mowing grass. I found that if I used a bolt that was long and the unthreaded part of the bolt was long enough to allow the threads to be outside of where the bolt shears, they lasted a lot longer. I have been a machinist for a long time which helped me to come to the conclusion that when they roll the threads on bolts, there is a quite a bit of stress left in the area between the the threads and the shank of the bolt. I have seen a few shear bolts break the threaded part off and fly away but not completely shear the bolt. This is a long answer to a simple question, I guess. Hope this helps.

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