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  1. #1
    Platinum Member nspec's Avatar
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    Dec 2007
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    619
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    Southern Rhode Island
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    Kubota B2630, '53 Farmall Super H, '47 Farmall AI, '44 Farmall A

    Default Post Hole Digger Shear Bolt question

    Just bought a used Woods posthole digger. The bolts which are in the holes where the shear bolts should be are not correct. So, I go to put the proper sized shear bolts in the holes (according to the owner's manual) and the shear bolts as indicated in the book are significantly smaller than the holes on the unit. Is this right? I really can't imagine the previous owner enlarged the holes. Are the shear bolts supposed to fit snug in the hole or should they be loose. What we're talking here is a shear bolt a couple of bolt sizes smaller than the hole. Just doesn't seem right to me.

    The next question is then, if it's NOT right, what should I do? Bigger shear bolt? Will I run the risk of hurting something if I use a bigger bolt? Should I just run the smaller bolt?

    Sort of at a loss on this one, so any help would be greatly appreciated.

  2. #2
    Gold Member
    Join Date
    May 2006
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    266
    Location
    NE TX
    Tractor
    Long LongTrac

    Default Re: Post Hole Digger Shear Bolt question

    There has been several discussions about shear bolts here, but I never heard about size of the hole being off. I only have two implements with shear bolts and they are both a perfect snug fit. Often people disagree on grade of the bolt. I use grade 5 bolts on post hole digger and shredder. Shedder has a very lary stump jumper.

    If Woods help desk will not help you I would get bolts that fit,
    Maybe grade 2 first. My PHD bolt takes a 9/16 wrench, not sure of the size of hole.

  3. #3
    Silver Member
    Join Date
    Sep 2008
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    194
    Location
    NE Missouri
    Tractor
    Case DX35

    Default Re: Post Hole Digger Shear Bolt question

    When I used a Danuser auger it took either a 5/16 or 3/8 bolt (grade 5) and they worked fine. I sheared a few in tree roots and never did any damage to the auger. If they're too snug when they shear they usually bend and could be a challenge to remove.

  4. #4
    Silver Member
    Join Date
    Jun 2010
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    231
    Location
    Northern Illiniois
    Tractor
    Kubota L5740 HST

    Default Re: Post Hole Digger Shear Bolt question

    I've done the same...sheared bolts off...put same size back in grade 5. That's what they're there for.

    Maybe previous owner put in bolt that didn't shear well and had to drill the holes out and start over so to speak...I know a neighbor that did that!

  5. #5
    Elite Member Ken45101's Avatar
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    Feb 2009
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    southern Ohio
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    Kubota M5040, M9540, B21 TLB, B2710, RTV900, JD 325 Skid steer, KX-121-3 mini excavator

    Default Re: Post Hole Digger Shear Bolt question

    That would be my thought, that the previous owner got tired of replacing shear bolts and drilled it out for a larger bolt

    I would stick with what is specified. Start the auger slowly and I doubt that an enlarged hole will hurt.

    Ken

  6. #6
    Veteran Member
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    Aug 2005
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    1,491
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    Guernsey Co. Ohio
    Tractor
    Ford 3000, JD 2550

    Default Re: Post Hole Digger Shear Bolt question

    An enlarged hole certainly will cause the bolt to shear permaturely, and will cause excess play in the auger. The bolt needs to match the hole. Any chance that part of the manual is referring to a different model? Either way, shear bolts specs, IN MY OPINION, aren't rocket science like some would lead you to believe. I borrowed a PHD once that had grade 8 bolt as a shear bolt. Worst thing that happened was the tractor bogged down. If you're really worried, call Woods.

  7. #7
    Platinum Member nspec's Avatar
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    Dec 2007
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    Southern Rhode Island
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    Kubota B2630, '53 Farmall Super H, '47 Farmall AI, '44 Farmall A

    Default Re: Post Hole Digger Shear Bolt question

    Thanks guys. Turns out to be operator error. The spare shear bolts he gave me were not what the book specifies. What the book specifies fits the hole. Problem solved, appreciate the help!

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