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  1. #1
    Silver Member putt_putt_green's Avatar
    Join Date
    Mar 2007
    Posts
    199
    Location
    South Central MI
    Tractor
    JD 3520

    Default HP rating for attachments

    If a boxblade (I'm looking at Woods) says that it is rated for 40-70 HP, which horsepower is this refererring to? Is it gross engine HP, net engine HP, or usable HP?

    What are the consequences of running a 72" medium duty boxblade rated at 40-70 HP behind a 33 HP tractor? Their standard duty 72" boxblade is rated at 0-45 HP. Can someone tell me why the extra hundred pounds of steel on the medium duty boxblade requires more HP?
    Putt Putt Green
    JD3520 : canopy, loader with toothbar, hoe, boxblade, 2-14 plow, tiller, and pallet forks.

  2. #2
    Platinum Member
    Join Date
    Jan 2002
    Posts
    831
    Location
    Tidewater VA.
    Tractor
    Ford '92 2120

    Default Re: HP rating for attachments

    You are generally going to need 5 - 6hp per ft. for ground engaging equipment. I always just used the published HP in the specs but I guess with Hydrostatic drives there will be a usable HP rating as well.
    That extra 100 Lbs of weight on the med duty will make the blade really dig and will need more HP
    Steve...

    "My biggest fear is that when I'm gone my wife will sell all my tractor gear for what I said I paid for it. "

  3. #3
    Veteran Member
    Join Date
    Sep 2005
    Posts
    2,043
    Location
    Ohio
    Tractor
    Case DX55, Ford 850

    Default Re: HP rating for attachments

    It's not that the heavier blades require the HP, but the other way around. They don't want someone bending up a blade by putting the smaller blade on a larger tractor.

  4. #4
    Super Member
    Join Date
    Sep 2000
    Posts
    6,595

    Default Re: HP rating for attachments

    Ford 850, is partially correct. (at least I agree with him - so he must be correct LOL!!) The max hp is to protect the attachment.

    BUT, the HP range is the "working range" for tractors to effectively use the equipment. Mostly, it is assuming a 2WD tractor. They are really after an indirect correlation of hp with tractor size and effective traction. For 2wd tractors, more HP is usually found in a larger and heavier tractor. More weight gives better traction. If you look at the 4x4 series of box scrapers, you will see that the hp range is different.

    I bought a decent woods (gannon landscaper) box. It is 66" wide and 900# or so. I wouldn't be able to pull it as well if it was an extra 6" wider and had an extra shank. Tractor is a kubota L3410 HST. But that depends on soil, WI is similar to MI in that regard (even though we have a better football team LOL).

    jb

  5. #5
    Veteran Member jbrumberg's Avatar
    Join Date
    Jan 2006
    Posts
    2,073
    Location
    Western MA
    Tractor
    New Holland TC29DA, John Deere 455D

    Default Re: HP rating for attachments

    putt putt green:

    Welcome to TBN ! I see nothing wrong with the information provided you. I go by the 1':5-6HP "Rule" using gross engine HP for the HP criteria when purchasing attachments and the "rule" works for me. I have not yet purchased a BB yet (so I could be talking out of my anal pore ) due to the constraints placed upon me by the "COMPTROLLER a.k.a. "SHE WHO MUST BE OBEYED" , but I am leaning towards a 60" M/HD model due to the heavy clay, rocky soil typical of NE based on a lot of research on the internet and here on TBN. Most of the thread replies on TBN suggest a BB that is heavy and slightly wider than your widest tire width. Interestingly in almost all cases the recommendations provided follow the "rule". The exceptions as it applies to BB's are for tractor operations in light loamy and sandy soils. Good luck on your research and acquisition. Prepare yourself for a lot of confusion, contradictory information, inconsistent data/opinions in your search. Most of the major tractor home websites have tractor selector software that based on your data input will recommend tractor models. The software appears heavily "loaded" towards FEL information and land size. Most of the "specifications" provided appear to be driven by Sales and Marketing Departments and the "spec" information is inconsistent as many brands "play" with how and where they take their measurements compared with the competition. Ask a lot of questions, sit on and drive all tractors of interest, and get a "feel" for the dealerships with whom you will ultimately be dealing. Dealer "feel" is as important as tractor "feel" IMHO as a good dealership will probably save you money in the long run. Beware there are many, many HP junkies in TBNland . Jay .

  6. #6
    Silver Member putt_putt_green's Avatar
    Join Date
    Mar 2007
    Posts
    199
    Location
    South Central MI
    Tractor
    JD 3520

    Default Re: HP rating for attachments

    Thanks everyone. I'll go with the 1 foot to 6 gross engine HP rule, which should put me on the safe side. The Woods 6' boxblade is rated at 1:6.66 HP, which is probably Woods just covering themselves. From what I've read in other posts, the heavier duty, the better.
    Putt Putt Green
    JD3520 : canopy, loader with toothbar, hoe, boxblade, 2-14 plow, tiller, and pallet forks.

  7. #7
    Banned shvl73's Avatar
    Join Date
    Nov 2003
    Posts
    2,552
    Location
    NH
    Tractor
    Mahindra 2810HST

    Default Re: HP rating for attachments

    I have a 6' united box blade. It is more of a standard duty unit. It will still fill up with soil easily with the right top link adjustment and my 28hp hydro tractor will pull it with ease.

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