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  1. #1
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    Default converting a brush hog

    what size engine does a 5ft 3pt brush hog need to be self powered,will a 6hp with a 6to1 gear reducer do it

  2. #2
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    Default Re: converting a brush hog

    I would say no way on the 6hp.
    I have a 5'er and used to use it with a Ford 8N which is 24 or 29hp. I used to raise cutter up, back over palmettas and lower it slowly and it would eat them pretty good.

  3. #3
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    JD LA115, WH 244, WH 525 hydro-pops,Original Troy Built Horse 8 HP

    Default Re: converting a brush hog

    Quote Originally Posted by halltrash85 View Post

    What size engine does a 5ft 3pt brush hog need
    to be self powered? Will a 6hp with a 6 to 1 gear
    reducer do it

    The brush mower would not mow very well if at all
    if it even managed to rotate as the needed torque
    is not there.


    You would need a 4 cylinder wisconsin off of a
    Hesston or New Idea windrower/haybine.

    The issue then becomes whether you can move
    the mower without wheels because of the added weight.

  4. #4
    Epic Contributor Soundguy's Avatar
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    Default Re: converting a brush hog

    ditto on the wisonson engine.

    otherwise.. figure about 5hp per foot as a rough estimate...

    6hp wouldn't even power a 5' finish mower..

  5. #5
    Super Star Member RoyJackson's Avatar
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    Default Re: converting a brush hog

    Quote Originally Posted by halltrash85 View Post
    what size engine does a 5ft 3pt brush hog need to be self powered,will a 6hp with a 6to1 gear reducer do it
    I wouldn't go less then a 20 HP engine...even then, I don't think the torque would be adequate.
    Roy Jackson

    "Any government that does not trust its citizens with firearms is either a tyranny, or planning to become one."
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  6. #6
    Epic Contributor Soundguy's Avatar
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    Default Re: converting a brush hog

    not on a 20hp whizzbang lawnmower engine anyway.

    if it ws a REAL 20hp engine.. like out of a older small-ish tractor.. I'd probably trust it.. say something out of a farmall C etc..

  7. #7
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    Default Re: converting a brush hog

    DR uses a 15 and 20hp engines on their self powered 44" pull-behind brush mowers. You could try your 6 hp I wonder if it would even turn the rotational inertia of tthe cutter?

    DR Power Equipment - ATV Mower | 20 HP Pull Behind Mower| DR Power Equipment

  8. #8
    Elite Member Shield Arc's Avatar
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    Default Re: converting a brush hog

    Quote Originally Posted by Rock knocker View Post
    DR uses a 15 and 20hp engines on their self powered 44" pull-behind brush mowers. You could try your 6 hp I wonder if it would even turn the rotational inertia of tthe cutter?

    DRョ Power Equipment - ATV Mower | 20 HP Pull Behind Mower| DR Power Equipment
    After getting rid of those dam horses I needed something light to mow the pasture because it is too wet until about the end of July before I could get my tractor and brush hog in there to mow one area, so I bought one of those to mow the pasture. Worked great, it would mow 12-inch + grass easy, but the grandsons complained it didn't mow low enough to play baseball. Sold it and bought a commercial Toro zero turn.


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  9. #9
    Epic Contributor Soundguy's Avatar
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    Default Re: converting a brush hog

    i had a craftsman trail mower.. sold it.. couldn't keep up with pasture grass that a real hog could.... no room for 2nd best in mowing gear at my place..

  10. #10
    Super Star Member LD1's Avatar
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    Default Re: converting a brush hog

    6hp.....no way.

    20-25hp is what you need. I think that it would have adequate torque, cause keep in mind that a 6:1 reducer would be used to get down to the ~540rpm input. So torque goes up. HP is HP. Torque can be overcome with gearing. But gear changes dont make hp go up. HP remains constant (less any losses from friction).

    Also arent going to want to make it a direct drive. You will need a centrifugal clutch or I doubt you would ever start it.
    ".........there is only one way to find out."
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