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  1. #1

    Default How do I replace rotary cutter blades?

    I have a 72" Mohawk cutter on a 55HP tractor. I was mowing with it, and found a root ball that didn't give....One of the blades broke off at the bolt holes and then proceeded to violently shake the shredder for a couple of seconds before I could get it shut down.

    Anyway, once I order a new set of blades, what's the procedure for replacing them? Is this something I do through the hole in the deck? Can I do it with hand tools or do I need an impact wrench? Guessing no other damage was done but who knows.

  2. #2
    Elite Member whistlepig's Avatar
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    Preble County, Ohio
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    Kubota B7800 with FEL

    Default Re: How do I replace rotary cutter blades?

    You should be able to get to the nut through the hole in the deck. These are big nuts. 1 3/4" nuts if I remember correctly. May differ on your cutter. I use an impact wrench cause I have one it's easier. A big ratchet or breaker bar with a cheater bar would work also. These nuts are tight.
    I used to do the Hokey Pokey but I turned myself around.

  3. #3
    Gold Member
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    Nov 2007
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    PA
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    Kubota L3130 HST 4x4

    Default Re: How do I replace rotary cutter blades?

    Not certain about this model of cutters, but many require a new lock nut be used. Shims are also used to get the correct clearance between the bolt head and blade.
    Kubota L3130 HST 4x4, FEL LA723 w/QA, Backhoe BH90, Snow Blower: L2185 72" front mount, 7' back blade, carry all, 48" Pallet Forks w/QA, Sun Shade, Turf tires & Rubber Chains for the winter, Extra forward and rear lighting. BearCat 73454 Wood Chipper. LandPride RCR2672 Rotary Cutter. Approximately 290 hours

  4. #4

    Default Re: How do I replace rotary cutter blades?

    Yeah, ill order new nuts/bolts. Thats what the manual says. How do you keep the bolt from spinning? Or will it?

  5. #5
    Elite Member whistlepig's Avatar
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    Preble County, Ohio
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    Kubota B7800 with FEL

    Default Re: How do I replace rotary cutter blades?

    On all the cutters I have changed the blades the shank of the bolt is keyed into the stump jumper. If yours is the same the bolt shouldn't spin. You may have to take a big hammer and punch to drive the bolt out of the stump jumper through the hole in the top of the cutter. This is usually a press fit.
    I used to do the Hokey Pokey but I turned myself around.

  6. #6

    Default Re: How do I replace rotary cutter blades?

    Cool. Sucks. JUST had these things sharpened a couple months ago when the tractor was in the shop for a grapple install. :/ Its got a slip clutch too, not sure why it broke.

  7. #7
    Bronze Member
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    Dec 2012
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    Western NC
    Tractor
    green

    Default Re: How do I replace rotary cutter blades?

    The bolt is keyed on mine, but still a good two person job. I use a 3/4" drive, 4' long breaker bar to change ours, but you can use a pipe for leverage too. Get everything nice and clean for re-install, and consider some loctite on the new bolts.
    *JD 5085M *JD 6110 w 640 loader *JD 6330 *AC F2 Gleaner *Ford 7.3 Powerstroke x 4

  8. #8
    Elite Member whistlepig's Avatar
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    Preble County, Ohio
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    Kubota B7800 with FEL

    Default Re: How do I replace rotary cutter blades?

    It's not easy but I have changed many blades by myself. It's easier if the one end of the rotary is lifted with a loader.
    I used to do the Hokey Pokey but I turned myself around.

  9. #9
    Bronze Member
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    Dec 2012
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    Western NC
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    Default

    I hook the chain hoist to the rear of the mower to secure it. The 5/8" thick blades on our mower are unwieldy but the keyed bolt usually does provide enough friction to hold the blade as it hangs there.
    *JD 5085M *JD 6110 w 640 loader *JD 6330 *AC F2 Gleaner *Ford 7.3 Powerstroke x 4

  10. #10
    Platinum Member
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    Apr 2005
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    Erin, Tenn.
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    2001 Mahindra 4110

    Default Re: How do I replace rotary cutter blades?

    I just changed blades & bolts on my older Howse 6' (about 20+ years old) cutter this past season. Our local farmer's co-op keeps bolts in stock and the ones for mine fit quite a few other brands as well. The nuts took a 1 11/16" socket - not quite in everyone's toolbox. The bolts on mine have a shoulder for a 1/2" thick blade and the keyed shoulder that fits into the stump jumper is ever so slightly tapered. The last time I had changed blades & bolts was about 15 years ago but the nuts came loose with my Snap-On 1/2" drive impact after soaking overnite with Thrust penetrating fluid. My deck has the typical hole behind the gearbox for accessing the nuts.
    2001 Mahindra 4110, FEL w/5' & 6' QA buckets & forks for the 5', 6' Atlas boxblade, older 6' Howse rotary, Leinbach 7300 PHD w/9" & 12", MF 2/3 bottom plow, 20"x6' bog disc, KK subsoiler, KK middlebuster, Kubota BL60C 5' tiller, Maschio 6' finish mower.

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