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  1. #11
    New Member
    Join Date
    May 2009
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    1
    Location
    Dover PA

    Default Re: Help? Broken mower blade bolt

    we drilled it out and used an easy out and it would not budge with a 1/2 impact driver. we are going to bore it out with a milling machine and take it from there

  2. #12
    Elite Member
    Join Date
    Sep 2008
    Posts
    3,998
    Location
    NE USA
    Tractor
    JD LA115, WH 244, Troy Built Horse 8 HP

    Default Re: Help? Broken mower blade bolt

    Quote Originally Posted by proconnor View Post
    we drilled it out and used an easy out and it would not budge with a 1/2 impact driver. we are going to bore it out with a milling machine and take it from there
    ================================================== =======



    If you have not done it already try assaulting it with a carbon dixide extinguisher-outside in the open air of course to shrink the broken stud first and then try to extract it.




    leonz

  3. #13
    Silver Member jesseb3@att.net's Avatar
    Join Date
    Jun 2006
    Posts
    225
    Location
    South Central PA
    Tractor
    Kubota BX2350, John Deere X530

    Default Re: Help? Broken mower blade bolt

    Leonz,

    It's in the hands of the machinist now, but that's a "cool" idea. Sorry, couldn't help myself.

    We use freeze spray at work to troubleshoot electronics. Wish I would've thought of that, just to try it! With the nozzle, you could direct the spray right into the hole that was drilled into it. Much safer, and cheaper than a fire extinguisher too. And wow does it get cold!

    Jesse
    BX2350 - FEL, 48" Box blade, Markham toothbar, ROPS mounted lights, BXpanded bucket hooks, 48" Howse brush cutter

  4. #14
    Silver Member jesseb3@att.net's Avatar
    Join Date
    Jun 2006
    Posts
    225
    Location
    South Central PA
    Tractor
    Kubota BX2350, John Deere X530

    Default Re: Help? Broken mower blade bolt

    Well, this has been resolved. My buddy "proconnor", who also posted to this thread, got a machinist involved. After the easy out failed to extract the bolt, the machinist milled out the bolt as close to the threads as possible.

    I guess he crumpled in some of the remaining bolt, and then used a tap to to remove the rest of the thread that was left. From what I understand, it's good as new - no damage to the original shaft threads.

    The machinist, who builds custom hydraulic cylinders for equipment, says that he recommends pure silicon caulk for bolts. I'm going to remove my blade bolts, and make sure that I coat them so that I don't run into issues.

    I found that the shaft would have cost $110 alone, not including the effort to rebuild the gearbox.

    The machinist was a friend of proconnor's, so he got away with a cheap repair.

    Jesse
    BX2350 - FEL, 48" Box blade, Markham toothbar, ROPS mounted lights, BXpanded bucket hooks, 48" Howse brush cutter

  5. #15
    Platinum Member savageactor7's Avatar
    Join Date
    Sep 2008
    Posts
    571
    Location
    CNY

    Default Re: Help? Broken mower blade bolt

    Well that's good to hear for you that everything is fixed.
    Kubota B1750 with chains on all 4 turf tires. CC1440 & GT2550

  6. #16
    Elite Member dodge man's Avatar
    Join Date
    Oct 2008
    Posts
    4,666
    Location
    West central Illinois
    Tractor
    Kubota BX2350

    Default Re: Help? Broken mower blade bolt

    Yeah, my experience with easy outs isn't good. If a bolt is broken off due to some kind of impact breaking it off, they work great. Most of the time bolt is broken off because it's rusted in place. In this case, the easy out usually ends up broken in the hole.

  7. #17
    Veteran Member have_blue's Avatar
    Join Date
    Oct 2003
    Posts
    1,730
    Location
    Eunice, Louisiana
    Tractor
    L4400

    Default Re: Help? Broken mower blade bolt

    Quote Originally Posted by proconnor View Post
    we drilled it out and used an easy out and it would not budge with a 1/2 impact driver. we are going to bore it out with a milling machine and take it from there

    I've had good luck simply drilling out the bolt with a left hand drill. When most of the core is drilled out, it relieves some of the pressure, and the heat and vibration from the drill usually causes the bolt to back out on its own. A little liquid wrench-type stuff also helps a little. If the bolt is grade 8, sometimes you can spot drill a dimple on the side of the bolt and tap it CCW with a hammer and center punch.
    -

    Bob

    From the heart of Cajun Country

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