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  1. #1
    Bronze Member S Putnik's Avatar
    Join Date
    Nov 2012
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    58
    Location
    Portland, OR
    Tractor
    Yanmar YM336D

    Default How much pto Hp is needed for a 48" brush mower?

    Just curious what is recommended and what one can get away with by slowing down a bit.

    Thanks.
    Yanmar YM336D - "Schlepper" with loader and other toys

    Grow hard or go home!

  2. #2
    Veteran Member
    Join Date
    Jan 2010
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    2,497
    Location
    Northern, IL
    Tractor
    Branson 2400H

    Default Re: How much pto Hp is needed for a 48" brush mower?

    I ran a 48" bush hog with kubota BX1850. Only issue was front end was light when going up hill carrying the mower. I was cutting grass 12 - 18" high with no brush.
    Artificial Intelligence will never overcome natural stupidity.

    Branson 2400H MMM & FEL

    JD 112

    BX1850 gone but not forgotten

  3. #3
    Elite Member
    Join Date
    Feb 2012
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    4,389
    Location
    Holland, PA
    Tractor
    Kubota L5740, Case IH 255, Gravely 8199G

    Default Re: How much pto Hp is needed for a 48" brush mower?

    my memory in reading posts here was about 5hp per foot of mower and that was likely for a light load. I used a five foot mower on my 21hp pto tractor and it did fine, but it was not pushed hard. Definitely need front weights; I had to build a weight box for the front of my tractor.
    I found this helpful: TractorData.com - Mowing with tractors

  4. #4
    Gold Member
    Join Date
    Jul 2011
    Posts
    423
    Location
    SW Arkansas
    Tractor
    Rusty junk

    Default Re: How much pto Hp is needed for a 48" brush mower?

    5hp per foot is the minimum recommended rating. At 5hp/ft you will be dramatically slowed in the thick, tall grass. 8hp/ft and you can breeze right through the thickest of grass or brush.

  5. #5
    Super Member
    Join Date
    Mar 2008
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    9,870
    Location
    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: How much pto Hp is needed for a 48" brush mower?

    5hp/foot is the rule of thumb (as has been said). We have a 5' brushhog that we run behind the B7500 (16PTO HP) and our L3830 (32 PTO HP).
    You can bog the L3830 down with a 5' mower, but it takes some doing. The B7500 makes you crawl unless mowing light weeds.

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

  6. #6
    Super Star Member
    Join Date
    Jul 2011
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    14,431
    Location
    Yanceyville, North Carolina
    Tractor
    Kubota L4400

    Default Re: How much pto Hp is needed for a 48" brush mower?

    Quote Originally Posted by S Putnik View Post
    Just curious what is recommended and what one can get away with by slowing down a bit.

    Thanks.
    My research shows these specs on a Shibaura SU1540 that you have listed in your profile. Engine HP-18 PTO HP-15 In my opinion, a lot would depend on the terrain that you are mowing and the type and height of the material that you are mowing. Hilly land requires more power than flat land. Are you just mowing grass or are there saplings present? BTW, best wishes.
    The PUPIL who does not surpass his Master, fails his Master.

  7. #7
    Elite Member smstonypoint's Avatar
    Join Date
    Oct 2009
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    3,839
    Location
    SC (Upstate) & NC (Piedmont)
    Tractor
    NH TN 55, Kubota B2320 & RTV 900, Bad Boy Outlaw 61" ZTR

    Default Re: How much pto Hp is needed for a 48" brush mower?

    Check the various manufacturers' recommendations regarding minimum HP requirements. For example, Woods lists a minimum of 15 HP for their 4' cutters: Rotary Cutters.

    Steve

  8. #8
    Elite Member
    Join Date
    Feb 2012
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    4,389
    Location
    Holland, PA
    Tractor
    Kubota L5740, Case IH 255, Gravely 8199G

    Default Re: How much pto Hp is needed for a 48" brush mower?

    Hilly land requires more power than flat land.
    ditto
    when I was mowing one field with a long incline, it was clear I was taking all the hp out of the engine, and I'd get some occasional puffs of smoke. All normal, but if you are running near the limit, keep an eye on your temp gauge.
    I thought you might find this pic interesting to confirm comments on front weights. When I first got this mower, which is as big as the tractor, it was Land Pride's lightest weight 60", intentionally, since I was mowing field grass, never brush.
    When I raised the mower up, and stepped on the rear of the mower deck, the front wheels of the tractor lifted up. That sure got my attention. 300 pounds of front weights later, all was well.
    Attached Thumbnails Attached Thumbnails -p1010615-jpg   -p1010308-jpg  

  9. #9
    Veteran Member
    Join Date
    May 2005
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    1,262
    Location
    Balls Creek, NC
    Tractor
    New Holland 1720

    Default Re: How much pto Hp is needed for a 48" brush mower?

    I have no trouble pulling a 5' squealer bush hog with my New Holland 1720 that is rated @ 23.5 pto hp...
    The 5 hp per foot rule is IMHO right on the money but you can get by with 4...

  10. #10
    Super Member LD1's Avatar
    Join Date
    Apr 2008
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    9,986
    Location
    Central Ohio
    Tractor
    Kubota l3400

    Default Re: How much pto Hp is needed for a 48" brush mower?

    Just depends on how slow you want to go. If you want to crawl along in lowest possible gear, you can do fine with MUCH less than 5hp per ft.

    I have seen people use 6' cutters behind old wore out N-series fords that probabally only mustered 20-21 PTO power. (they were 23 when new and fresh). So that is just a tad over 3hp per ft.

    Using that ratio, 13-14hp would equate to about the same.

    Curious why you are asking though? do you have a particular tractor in mind? Or just shopping?
    ".........there is only one way to find out."
    "Ok, hold my beer and watch this.........."


    Ford 5500 Backhoe
    Kubota L3400GST W/LA463 FEL
    2005 Dodge 3500 4x4 Diesel
    8N Rebuilt and restored
    Bushhog 306
    3 Homemade wood hauling trailers
    Dolmar 6400 84cc ported
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