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    Default bush hog gearbox rating & sheer pin vs. clutch

    I'm a greenhorn, and looking to buy a bush hog. I've got two questions. What does the gear box rating mean. I see some are 40 hp and others are 60 hp. Does that mean my tractor pto hp shouldn't exceed those gear box hp ratings? Second, is a slip clutch worth the extra money? I'll be cutting mostly pastures. Thanks for all the help you're giving me!

  2. #2
    Veteran Member Charlesaf3's Avatar
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    Default Re: bush hog gearbox rating & sheer pin vs. clutch

    yes a slip clutch is worth the extra money, without a doubt.
    ----------------------------------------
    Charles

    Kubota B3030
    Kubota M59 w/hydro thumb
    Neat stuff - ATI Preseeder, Hydraulic PHD, Wallenstein BX62r Chipper, Millonzi Grapple, CA 4n1 Bucket. Delta Hook Rear QA system.
    Too many other random attachments to list (or to own, per my wife) and a really bad tool addiction. But at least I haven't bought a dump truck or bulldozer. Yet.

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    Super Member greg_g's Avatar
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    Default Re: bush hog gearbox rating & sheer pin vs. clutch

    Quote Originally Posted by witterbound
    What does the gear box rating mean. I see some are 40 hp and others are 60 hp. Does that mean my tractor pto hp shouldn't exceed those gear box hp ratings? Second, is a slip clutch worth the extra money?
    1. 40 and 60 are the small boys. They go up considerably from there. But to the point, it's a number that relates to your tractor's PTO horsepower rating. If you're rated for 45hp at the PTO, don't buy a mower with a 40hp transmission.
    2. Yes, but again it's dependent upon the horsepower rating. They're not as common on the low end implements.

    //greg//
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

  4. #4
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    Default Re: bush hog gearbox rating & sheer pin vs. clutch

    The slip clutch is a great thing - but requires steady mainenance. If you don't want to spend the extra 15-20 minutes every time you use use it, then save the bucks and just get the shear bolt.

    A slip clutch will freeze up in as little as a day if left in a moist area, or in 1-4 weeks in a typical barn environment. The only way to know if it is free or not, is to loosen the bolts and slip it, the tighten them back correctly. A shear bolt is a hook up and go deal - until you pop them. If you are just doing a pasture, you probably won't pop more than a half dozen bolts in 10 years.

    jb

  5. #5
    Epic Contributor Soundguy's Avatar
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    Default Re: bush hog gearbox rating & sheer pin vs. clutch

    I agree.. if you don't maintain it religously.. get a shear bolt design..

    soundguy

  6. #6
    Veteran Member Rara Avis's Avatar
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    Default Re: bush hog gearbox rating & sheer pin vs. clutch

    Quote Originally Posted by witterbound
    I'm a greenhorn, and looking to buy a bush hog. I've got two questions. What does the gear box rating mean. I see some are 40 hp and others are 60 hp. Does that mean my tractor pto hp shouldn't exceed those gear box hp ratings? Second, is a slip clutch worth the extra money? I'll be cutting mostly pastures. Thanks for all the help you're giving me!
    http://www.landpride.com/ari/attach/...s/311-254m.pdf
    Start at Page 17...you'll find discussions on both 4 bolt and 8 bolt slip clutches...

  7. #7
    Gold Member RWolf's Avatar
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    Default Re: bush hog gearbox rating & sheer pin vs. clutch

    Well I'm definitely working on exceeding a few shear bolts in 10 years . I've gone through 3 in the last 3 weeks as I've been clearing some cactus and trying to avoid rocks. Seems my 6' frontier has a lot of iniritial (sp) weight and I need to be very carful when going over some of the vegitation on the property. I'm looking at adding a slip clutch because of the number of shear pins I'm going through and a $3.50 a pop it's going to get expensive.
    2008 5103, FEL, 6ft. HD Box Blade, 6ft. Rotory cutter. And many more to come.

  8. #8

    Default Re: bush hog gearbox rating & sheer pin vs. clutch

    In Arkansas, I'll likely be hitting a lot of rocks, as they seem to grow in some areas I'll likley be bush hogging. If I hit a rock am I likely to shear a pin, or will the bush hog blades flex enough to save the pin? I though that the "unfixed" blades on a bush hog kept it from binding up like mowers can. Is that wrong, or are the unfixed blades just one defense, the sheer pin being or clutch being the backup?

  9. #9
    Super Member greg_g's Avatar
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    Default Re: bush hog gearbox rating & sheer pin vs. clutch

    Quote Originally Posted by john_bud
    The slip clutch is a great thing - but requires steady mainenance. If you don't want to spend the extra 15-20 minutes every time you use use it, then save the bucks and just get the shear bolt.
    Maybe I got a good one, because I haven't found that to be true. I used to disassemble/clean/reassemble/adjust mine twice a year. Skipped one of them a couple years ago, so the thing went a year without maintenance. Still worked fine. Even though mine's parked out in the pasture year round, I've had no problems at all cutting the maintenance back to once a year.

    //greg//
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

  10. #10
    Super Member greg_g's Avatar
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    Default Re: bush hog gearbox rating & sheer pin vs. clutch

    Quote Originally Posted by witterbound
    ... will the bush hog blades flex enough to save the pin?
    Ain't no flex to a rotary cutter blade - they're your basic blunt instrument, usually an inch or more thick. I too had a shear bolt rig before I went slip clutch. Never broke a shear bolt till I hit a horse blanket. The RC would hammer away at 50 pound rocks without batting an eye. But hit a horse blanket......!!! Fence wire will do it too.

    //greg//
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

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