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  1. #1
    Silver Member jesseb3@att.net's Avatar
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    Jun 2006
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    South Central PA
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    Kubota BX2350, John Deere X530

    Default Help? Broken mower blade bolt

    While trying to remove the bolt that holds the middle blade, my buddy and broke the bolt. This is the one that threads into the main gearbox shaft, so a simple replacement would prove costly.

    Has anyone else done this? Were easy-outs successul? Our opinion is that the bolt is mostly likely grade 8, and that drilling will be difficult, and if it broke as it was, then most likely we'll break the easy out as well. Heat will probably cook the bearings, so we're concerned about that route/

    Any ideas guys?

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

  2. #2
    Veteran Member irwin's Avatar
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    Feb 2007
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    1,297
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    SE Conn
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    2004 Kubota L35TLB, '89' Cub Cadet 1541

    Default Re: Help? Broken mower blade bolt

    Left hand or right hand threads? A picture would help us give suggestions. Most broken off bolts can be removed ..The HOW depends on factors..like how much room you have to work and the direction of threads, and whether it's hardened steel.

    If it's a left hand thread, you'll want to be very careful.(left hand thread chasers aren't sold everywhere. specialty tool. )..If you have time, soak it with penetrating oil and let it sit a few days. If time is an issue maybe you should bring it to a machine shop..having the right tools, makes a world of difference..and if you end up going to a machine shop..don't buck it up too badly first..it'll be easier for them if its not all chewed up.
    .....Tim

  3. #3
    Silver Member
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    Jan 2004
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    135

    Default Re: Help? Broken mower blade bolt

    Carbide drill bit, moderate heat and pray you don't break the EZ out. You need to ask yourself if you tend to be heavy handed? If so, take it to a machine shop. Sometimes those gear boxes are only available as units. $$$$$

  4. #4
    Elite Member
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    Sep 2008
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    3,868
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    NE USA
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    JD LA115, WH 244, Troy Built Horse 8 HP

    Default Re: Help? Broken mower blade bolt

    Quote Originally Posted by Outlander View Post
    Carbide drill bit, moderate heat and pray you don't break the EZ out. You need to ask yourself if you tend to be heavy handed? If so, take it to a machine shop. Sometimes those gear boxes are only available as units. $$$$$
    ================================================== =========

    Do as Irwin and Outlander have suggested as more than likely you will require the use of a drill with an electromagnet to secure the drill and magnetize it to
    the underside of the mower deck to drill it out.

    Then buy three Allen head caps screws and Allen head cap screw spring washers replacing the old ones from the machine shop and have them install them using blue loctite and a torque wrench.

    No they will not tear up the lawn or the driveway and if they do the mower is too low!!!!!!!!!

    It is easier to remove an Allen head cap screw bolt as it has more area to grip against-been there done that lots of dinged fingers and hands.

    leonz
    Last edited by leonz; 05-10-2009 at 05:22 PM. Reason: stuff

  5. #5
    Platinum Member savageactor7's Avatar
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    CNY

    Default Re: Help? Broken mower blade bolt

    I gonna keep an eye on this cause I have a woods 72" 3ph mower whose middle spindle also disappears into a gear box.

    Jesse do you have a woods mower?...if so I'll see if I can't find some manuals on it to give you a heads up.

    For the rest of you next time you sharpen blades put some never-seize on those threads and you can avoid that problem. btw those are reverse threaded nuts that hold the blades on a woods mower.

    More I think of it there's no easy way, flip the deck over, hose down broken bolt with PB blaster, go have dinner, come back with the right sized easy out and work at it. before leaving it hose with some more PB blaster.
    Last edited by savageactor7; 05-10-2009 at 05:51 PM.
    Kubota B1750 with chains on all 4 turf tires. CC1440 & GT2550

  6. #6
    Super Member George2615's Avatar
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    Feb 2005
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    Central Square, NY
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    LS XR3037HC

    Default Re: Help? Broken mower blade bolt

    Jesse,
    I once broke off a mower blade bolt also. It broke off flush and at the time I did not have a good drill bit set or easy outs. I got it out by placing a nut on the broken bolt and welding the inside of the nut to the broken off bolt. Then after it cooled a little I used an impact gun on the nut and the broken off bolt unscrewed from the bearing assy. (a wrench on the nut hit with a hammer would also have worked). I think the heat from welding the nut on helped loosen it. By the way my bolt was standard right hand thread. Left (counter clockwise) to remove.

  7. #7
    Platinum Member
    Join Date
    Jun 2003
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    553
    Location
    Western Illinois
    Tractor
    Kubota B2400

    Default Re: Help? Broken mower blade bolt

    Check your hardware store for left hand twist drill bits. Another thing to try would be drill a shallow hole into broken bolt and try the Craftsmen stripped screw head remover bits. I've had luck with them lately on some bolts I thought would never come out!

  8. #8
    Veteran Member Volfandt's Avatar
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    Sep 2004
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    1,880
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    TN
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    2004 Kubota BX23, 1966 WheelHorse 856

    Default Re: Help? Broken mower blade bolt

    I have an older BX23 w/60" MMM. I have had the blades off many times. They are not reverse threaded. Unless kubota has changed the spindles they should be Righty tighty, lefty loosey.

    The gearbox is rebuildable and you can order a new spindle should all else fail. I recall a post from long ago about someone else having a similar problem and he ended up buying the entire gearbox, seems it came out cheaper for him.
    Good luck
    BX23 w/60" MMM & thumb.
    1966 Wheelhorse 856, Gear drive.
    1966 Wheelhorse 876, HST drive.
    w/50"sickle mower, 36" RDM, snow/grader plow, Alternator welder.

  9. #9
    Silver Member cdcole's Avatar
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    Mar 2003
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    158
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    Wisconsin
    Tractor
    TC25D

    Default Re: Help? Broken mower blade bolt

    I broke one off once. I removed the entire spindle from the mower deck then locked it down in a vice beneath a drill press. I drilled a hole straight down the center but it slid to one side taking about 20% of the threads with it. This was almost a blessing in disguise as I then could use a small cold chisel to collapse the remnants of the bolt to the center then piece by piece I got it out with the last part spinning out while clenched to a vice grip. I tried the same trick for my neighbor but his bolt was too hard and I busted bits and they slid off the bolt to the softer shaft material. Good luck.
    So you think you are safe? Do you shut the mower off - every time you get off? Wear seatbelt - every time? Engage parking brake - everytime? Mow with people in path of discharge? Ear plugs in? ROPs up? Bucket low? Balanced? PTO off- when off tractor? Cooled down before putting it in barn? Checking wheel nuts for tightness? Looking out for kids? Backing up blind?

  10. #10
    Silver Member jesseb3@att.net's Avatar
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    South Central PA
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    Kubota BX2350, John Deere X530

    Default Re: Help? Broken mower blade bolt

    Thanks for all the suggestions guys. We've run the gamut of ideas, including welding a nut on it. I told my buddy that I had heard of someone, somewhere, doing that. Obviously it was here, and probably straight from George2615. We're both a bit embarassed that neither one of us owns a welder... we seem to have everything else!

    For what it's worth, they're not left-handed threads on this deck, so we could use a standard Easy out. However, we've chickened out - it's being dropped of at a machinist's shop this evening. The guy is good, and he's a friend of my buddy, so for the price, it's just not worth risking further damage by the two of us.

    In the background, I've got a line on a place that sells all the deck parts, and I'm inquiring as to what they get for a new box.
    BX2350 - FEL, 48" Box blade, Markham toothbar, ROPS mounted lights, BXpanded bucket hooks, 48" Howse brush cutter

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