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  1. #1

    Default Tightening Kubota Mower Blade Bolts

    Need some guidance from someone who knows what he or she is doing,

    I have a BX2350 for which I just purchased a MMM, model RCK5423BX. With the deck I bought a mulching kit. When removing the standard blades I found that blocking the blade with a piece of wood while turning the blade bolt didn't work, so I had to hold the upper spindle nuts with another wrench. No big problem. The center blade bolt came loose with the block of wood trick---fortunately.

    THE PROBLEM: When I installed the new blades I again used the second wrench on the upper nuts in order to be able to torque the blade bolts to specs. The wood block won't hold the center spindle, however. The whole pulley/spindle assembly rotates. Since the gearbox is on top of the center spindle, how does one go about holding that spindle? I notice there's a round rubber seal in the top of the gearbox which displays the MMM model number. Is there a spindle nut to grab onto if that seal is removed?

    (It would've been REALLY nice had kubota's instruction manual addressed this issue. Can't believe it hasn't come up before.)

    Thanks for your assistance.

    Bill

  2. #2
    Gold Member Dyer, retired's Avatar
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    Feb 2008
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    Belgrade, Maine
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    2003 Kubota BX1800 and 2010 B3030

    Default Re: Tightening Kubota Mower Blade Bolts

    Not sure why a block of wood isn't working. I just took my blades off and reinstalled them with no issue at all using a 2 x 4 x 12 block of scrap wood. I had to rotate the blade to a point where the wood jammed against the blade and the deck housing and then wrench some pressure to keep the block in place while I put enough force with both hands on the wrench to break the nuts free. Reverse to reinstall. This was the first time the blades have been off since 2003, so I really expected a harder time with it. I was surprised to get it all done with no blood spilled either. Maybe I'm missing what the issue is? Dyer, retired

  3. #3
    Elite Member zzvyb6's Avatar
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    michigan
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    jd 1070

    Default Re: Tightening Kubota Mower Blade Bolts

    Sounds like the wood block isn't working because the shaft is turning through the blade. I suppose the easiest thing to try is to put the mid-pto in gear and hope that it loosens and does not break the gearbox. However, I would break the nut off before I would try anything that could crack a gear tooth. Chop a slot in it and use a cold chisel (ouch on the bearings) or buy a nut cracker and take it off that way. If there has been Lock-Tite applied to these nuts, heat it with a propane torch first. Too much heat could fry a seal. The heat shock ought to work. But don't be afraid to crack the nut off. Buy a spare first. Chances are the nuts are buggered up anyway from all the wrenching on them...
    There is no "I" in team, but there is a "Me" if you want to jumble it up a bit...

  4. #4

    Default Re: Tightening Kubota Mower Blade Bolts

    If the spindle is turning then the adjacent blades must also be turning. Try putting the 2x4 under one of the adjacent blades. The belt tension on those mower decks are pretty tight so hopefully the belt won't slip on the pulley. If the belts slips then try squeezing the belt tighter around one of the pulley's with a quick grip clamp.

  5. #5
    Super Member radioman's Avatar
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    Ontario, NY
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    Kubota BX24

    Default Re: Tightening Kubota Mower Blade Bolts

    Dunno about you guys- but using a impact wrench and peice of wood to hold blade works just fine for me. the impact action makes a quick and safe work out of it.

  6. #6

    Default Re: Tightening Kubota Mower Blade Bolts

    Thanks to all who replied. Removing the nuts with an impact wrench is easy, but tightening them is another story. I've never seen an impact wrench whose actual torque was close enough to rated torque--just too many variables.

    The Quick Grips work. I tightened the belt with one and clamped the belt to the pulley with another. After blocking the blade I was able to torque the center spindle nut to specs. quite easily.

    Sorry, kubota, but my problem with all this is why is there no way to tighten the center nut without all the invention, not to mention blue air and wasted time?!!!!

    Bill

  7. #7
    Elite Member dodge man's Avatar
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    West central Illinois
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    Kubota BX2350

    Default Re: Tightening Kubota Mower Blade Bolts

    Mine does the same thing, but not always. I just gave up and use an impact, which seems to hold O.K.

  8. #8

    Default Re: Tightening Kubota Mower Blade Bolts

    Quote Originally Posted by hammerblossom View Post
    Thanks to all who replied. Removing the nuts with an impact wrench is easy, but tightening them is another story. I've never seen an impact wrench whose actual torque was close enough to rated torque--just too many variables.

    The Quick Grips work. I tightened the belt with one and clamped the belt to the pulley with another. After blocking the blade I was able to torque the center spindle nut to specs. quite easily.

    Sorry, kubota, but my problem with all this is why is there no way to tighten the center nut without all the invention, not to mention blue air and wasted time?!!!!

    Bill
    Necessity is the mother of invention as they say. I did not have a impact wrench the first time I struggled with it as you did. I have since gotten one. However, the bolt that holds the blade on is bigger than any of my impact sockets
    So I figured out the way to tighten and hold the spindle from turning with the clamp while blocking one of the other blades. It was a head scratch-er tho. Glad it worked for you.

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