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Subject: Rotary mower and shaft length

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Pete    Posted 04-01-2020 at 21:20:54 [URL] [DELETE]        [Reply] [Email]  
  • Rotary mower and shaft length
  • Recently recovered and got running the 1952 8N that my grandfather bought new and on which he taught me how to drive.

    I'm looking to purchase a rotary mower. Will just any mower work? Do I need to look for a certain length shaft to reach and attach to the pro?

    Appreciate any guidance.

    Lynn Patrick    Posted 04-02-2020 at 08:25:14 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Rotary mower and shaft length
  • I think you should DEFINITELY get one! And the fact that I have one for sale has NOTHING to do with it!<)

    Tim Daley(MI)    Posted 04-02-2020 at 06:37:31 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Rotary mower and shaft length
  • HiYa Pete-
    KUDOS on your ’52 8N and carrying on a family tradition. A rotary mower is the technical name for a ‘brush hog’ mower –is that what you seek? A Rotary Mower is meant to cut heavy thick growth. It consists of a single blade, and most have the stump jumper function and/or a shear bolt. That is that the blade will swing out of the way when/if an obstruction is encountered so the blade, and more importantly, gear box, aren’t damaged. A Finish Mower uses one or more fixed blades, and meant for lawn cutting. I suggest you haul your tractor to whatever dealer you are shopping with and let them hook you up with the correct PTO driveline shaft for the implement you choose. I also highly recommend that you use STABILIZER BARS with whatever mower you use. STABBARS will greatly limit the side to side sway motion which puts less strain and stress on the 3-PT arms. If you don’t already have them, know that there is a one right way and at least a half a dozen incorrect ways to install them -look in our HOW-TO’s Forum to see or email me with the LINK. FWIW & FYI: The label “BUSH HOG” is a trade/brand name and used nowadays to describe a brush hog/rotary mower by most everyone.





    Tim Daley(MI)

    Pete    Posted 04-02-2020 at 07:26:53 [URL] [DELETE]        [Reply] [Email]  
  • Re: Rotary mower and shaft length
  • What a great, thoughtful response. Thank you. Yes, talking about a brush hog (which I've always called a "bush hog" for some reason.) I'm not really working with a dealer of any kind, but perhaps I should. Looks like there is an option for a second set of stabilizer bars, running down from the 3-pt hitch area?

    Tim Daley(MI)    Posted 04-02-2020 at 08:36:25 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Rotary mower and shaft length
  • Everybody calls a brush hog a 'Bush Hog', just the nature of the beast now. Option? What do you mean? There are two bars, two fender brackets and the link pins and check chains to fasten with. You will also need longer hex bolts for the fender brackets. The bars fasten to the lower lift arms. The fenders get the brackets attached to the bottom of the axle bosses. The other end of the bars fasten to the brackets. The setup must be installed one correct way so as to not damage the lift arms and pump. SEE LINK

    Tim Daley(MI)

    Jock(OR)    Posted 04-01-2020 at 23:33:37 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Rotary mower and shaft length
  • Shaft length needs to consider the over-running clutch you should be using on the PTO output. I think most are about the same length, but you should measure yours to confirm.

    Different mowers could use different shaft lengths, depending on the cutting width of the mower and the design of the angle drive unit.

    Mark    Posted 04-05-2020 at 10:42:10 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Rotary mower and shaft length
  • I have two different mowers on my 9N. One of them the PTO shaft was too long and I needed to cut off some. Make sure to cut off enough to factor in the mower getting closer to your tractor when it is raised up. Pretty simple to do with a hack saw and deburr the tube when done. The other mower was just fine.

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