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  1. #21
    Epic Contributor Bird's Avatar
    Join Date
    Mar 2000
    Posts
    36,997
    Location
    Texas

    Default Re: shear pin vs. slip clutch

    John, right now I can't think of the proper words to describe the way that driveline is made, but the answer to your question is, nope, it won't come apart if you shear the bolt. You don't need to worry about that.

    Bird

  2. #22

    Join Date
    Apr 2000
    Posts
    1,490
    Location
    Hico, Texas
    Tractor
    Kubota M6800SD/LA1002 Loader Kubota RTV900

    Default Re: shear pin vs. slip clutch

    The first indication I got that I had sheared the shear pin was "I thought I just mowed that strip", then looked back and saw through the hole in the deck that the blade wasn't turning. [img]/w3tcompact/icons/smile.gif[/img]


  3. #23

    Join Date
    Apr 2000
    Posts
    610
    Location
    Ontario
    Tractor
    Ford 1710: Loader, Hoe, Snowblower, Box scrapper & 3ph Forks

    Default Re: shear pin vs. slip clutch

    I wonder if these ID's are the same for inch and metric bolts. Back in my motorcycle mechanic days, SAE was AST fine or course in inches. It would make sense for SAE to now have a metric standard. The PTO shaft for my snow blower takes a metric shear bolt. Guess I'll take a look at the bolt heads.


  4. #24
    Elite Member
    Join Date
    Mar 2000
    Posts
    3,239
    Location
    Eastern Virginia
    Tractor
    EarthForce EF-5 mini-TLB (2001)

    Default Re: shear pin vs. slip clutch

    If they're made in the U.S., they have the same markings, according to the information I've got.

    Mark


  5. #25
    Elite Member
    Join Date
    Mar 2000
    Posts
    3,239
    Location
    Eastern Virginia
    Tractor
    EarthForce EF-5 mini-TLB (2001)

    Default Re: shear pin vs. slip clutch

    John, probably what you're looking at isn't the shear bolt. The shear bolt isn't technically part of the PTO shaft, but part of the gear box input shaft or output shaft, depending on how it's designed. So all of the PTO shaft components remain completely intact when the shear bolt breaks because the two pieces of the gearbox input or output shaft are held together by their mounting points.

    Mark


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