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  1. #31
    Super Star Member
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    Mar 2008
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    14,803
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    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: Cautionary tale. Check your Shear Bolts and get a fire extinguisher for your tra

    I have only seen a grade 8 bolt used for a shear pin once. That was on an old bushhog brand cutter that had 2 1/4-20 grade 8 bolts that squeezed together a flat plate. Otherwise, I have only seen grade 2 or 5 used.

    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

  2. #32
    Old Timer Soundguy's Avatar
    Join Date
    Mar 2002
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    52,543
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Cautionary tale. Check your Shear Bolts and get a fire extinguisher for your tra

    i have an old, old servis ( rhino ) cutter that uses a flat plate and a single 1/4 gr8 bolt as the shear bolt.. those type are usually the exception to the rule.. and use a very small gr8

  3. #33
    Platinum Member
    Join Date
    Jan 2006
    Posts
    963
    Location
    West Central Idaho
    Tractor
    Kubota L5740HSTC3; B3000HSDCC

    Default Re: Cautionary tale. Check your Shear Bolts and get a fire extinguisher for your tra

    I have a Loftness 841 snowblower. All of the shear bolts, Auger sprocket, PTO shaft (both ends) are grade 5. the only exception is the drive sprocket, which is Grade 2. All verified by OEM Parts Manual.

  4. #34
    Super Star Member
    Join Date
    Feb 2006
    Posts
    11,827
    Location
    VA
    Tractor
    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: Cautionary tale. Check your Shear Bolts and get a fire extinguisher for your tra

    Perhaps that pto shaft was too weak for the application and twisted, then wouldnt telescope. Not long from there to failure. Same issue if it was a little too short. Telescoping at hi load with low overlap is very hard on everything. This could explain the stuck coupling at the tractor. If that kind of thing failed it you need bearngs on both ends [tractor/implement] to be checked. They may have been compromised by thrust loading.
    larry
    This side of 40
    JD2010, Kubota L3450/FEL w SK QC, L2550 w FEL
    Mahindra 7520 [Pinky] /FEL w Skid Steer QC/w Tilt Tatch & BH, BX1500 [Mighty Mouse]
    IH37 Baler, CCM165 Drum Mower, JD Rake
    JD 127 bushog, Flail, SK Tilt Tatch , KK tiller, Rhino rear blade, Post driver, post auger, chipper, pallet fork, Grapple/Loader Buddy, Homemade Splitter/DC Welder

  5. #35
    Veteran Member canoetrpr's Avatar
    Join Date
    Aug 2005
    Posts
    2,382
    Location
    Ontario, Canada
    Tractor
    Kubota M7040 cab/hyd shuttle - current, Kubota L3400 - traded

    Default Re: Cautionary tale. Check your Shear Bolts and get a fire extinguisher for your tra

    You know, the too short theory is sounding good actually. Still find grade 8 shear bolt to be wierd. Maybe a combination of too short and the shear bolt. I have in the past found it to be a pain to have enough room to get the shaft on. It was always just an irritant but perhaps there is a range there where it just binds.

    Still curious to hear how much of this you guys think I should just be out of luck for vs expect the blower manufacturer to take on under warranty.

    How can I go about checking the bearings and seals btw. Should I just be sending this off to thr dealer for a full checkup? I'm not the handiest guy in the world. I can change my oil, do normal maint items and changed an oil pan once.
    Current: Kubota M7040 cab, hydraulic shuttle, Kubota M20 loader (made by ALO), LandPride RCR1872 rotary cutter, Horst bale spears & forks, Woods HB72 box blade, Kodiak 7' rake, Walco cultivator, chain harrow, Meteor 74" pull style blower

    Traded: Kubota L3400, LA473 HST (300 hrs), and various attachments

  6. #36
    Epic Contributor k0ua's Avatar
    Join Date
    Jun 2009
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    27,113
    Location
    Branson, Mo.
    Tractor
    Kioti DK35se Hydrostat

    Default Re: Cautionary tale. Check your Shear Bolts and get a fire extinguisher for your tra

    Quote Originally Posted by canoetrpr View Post
    You know, the too short theory is sounding good actually. Still find grade 8 shear bolt to be wierd. Maybe a combination of too short and the shear bolt. I have in the past found it to be a pain to have enough room to get the shaft on. It was always just an irritant but perhaps there is a range there where it just binds.

    Still curious to hear how much of this you guys think I should just be out of luck for vs expect the blower manufacturer to take on under warranty.

    How can I go about checking the bearings and seals btw. Should I just be sending this off to thr dealer for a full checkup? I'm not the handiest guy in the world. I can change my oil, do normal maint items and changed an oil pan once.
    In my opinion, and that is all it is, just an opinion, if you trust this dealer and I believe you do, then I would let him and his mechanic diagnose the causes of the failure and how to proceed forward. This is what I would do, as isn't your tractor nearly new?

    James K0UA
    James K0UA

    Kioti DK35se hydrostat with 2 QA buckets, 48 inch. King Kutter Rotary Cutter. 750 lbs ballast box. Loaded tires, Construction Attachments SSQA Lightweight Pallet forks. EA 50 inch single lid "wicked" Grapple. Satisfied Everlast PA160 welder owner NRA Life Member How to add a link to a post . Best way to search TBN .


  7. #37
    Veteran Member canoetrpr's Avatar
    Join Date
    Aug 2005
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    2,382
    Location
    Ontario, Canada
    Tractor
    Kubota M7040 cab/hyd shuttle - current, Kubota L3400 - traded

    Default Re: Cautionary tale. Check your Shear Bolts and get a fire extinguisher for your tra

    Finally got around to checking my manual for the blower. Sure enough, my service manager was right. This thing calls for a grade 8 shear bolt on the PTO! I'm surprised. But it's there in black and white. He's talking to the manufacturer of the blower. I hope they can come up with a good theory / resolution for what to do going forward. My problem now is I don't really trust using it as-is.... even when the shaft is replaced. Maybe it does need to be a heavier duty shaft for this application.

    I'm using a kubota M7040 tractor and the blower is a Meteor PT75. The rating on the blower says 50hp minimum - I can't seem to find a max rating. I think my PTO is putting out about 70hp.

    I've also emailed my dealer to see if he would consider trading the blower in for a heavier duty push type one. Overall the dealership has been good to work with so lets hope I get a decent resolution to this.
    Current: Kubota M7040 cab, hydraulic shuttle, Kubota M20 loader (made by ALO), LandPride RCR1872 rotary cutter, Horst bale spears & forks, Woods HB72 box blade, Kodiak 7' rake, Walco cultivator, chain harrow, Meteor 74" pull style blower

    Traded: Kubota L3400, LA473 HST (300 hrs), and various attachments

  8. #38
    Platinum Member
    Join Date
    May 2011
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    823
    Location
    Trent Hills, ON
    Tractor
    Kioti DK40SE HST

    Default Re: Cautionary tale. Check your Shear Bolts and get a fire extinguisher for your tra

    Do you know how much overlap you had to start with? It sounds it wasn't enough and the friction of the shaft spinning with a bow in it, over heated the shaft over time. Does your tractor have telescopic lift arms on the 3pth? Mine does and I think the implement manufacturers aren't accounting for the extra length needed for their pto shafts. My rotary cutter's pto shaft is a bit shorter than ideal too, so your experience is a little reminder to rectify that... Hope the dealer will work with you on getting you back up and running.
    2011 DK40SE HST

  9. #39
    Gold Member
    Join Date
    Nov 2005
    Posts
    491
    Location
    Colebrook, N.H.
    Tractor
    Kubota L3830HST

    Default Re: Cautionary tale. Check your Shear Bolts and get a fire extinguisher for your tra

    Can't wait to hear how this story turns out. Sure seems like using a grade 8 hardened bolt defeats the purpose of having a shear bolt.
    -Jim

  10. #40
    Super Member Wagtail's Avatar
    Join Date
    Jan 2013
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    5,944
    Location
    St Helens, Tasmania, Australia
    Tractor
    JD 4105 / JD D110

    Default Re: Cautionary tale. Check your Shear Bolts and get a fire extinguisher for your tra

    Quote Originally Posted by jimainiac View Post
    I also read that the constant vibration of being on the tractor can compact the contents of the extinguisher to the point where it might not work. Don't know if that's true or not, but I figure why take a chance. I'm putting this on the top of my to-do list.
    Ah, the old vibration bugbear. I can honestly offer top advice to this = when clamping or bolting the FE mounting bracket to whatever surface, pad the bracket with 2 layers of 1/4" foam neopreme (the stuff that they make diving wet-suits out of or, in Australia, stubie/beer holders) and 1 layer between the FE quick-release bracket and the FE itself.

    This advice is from my serving on Navy Mine-Hunters. EVERYTHING on those ships are shock mounted!

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