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    snow blower sheer bolts

    I have a 54" blower mounted on a 2305 tractor. It is my only tool for clearing my 1300 foot gravel driveway. It seems to break sheer bolts very easy. Has anyone tried grade 8 bolts instead of the grade 5 bolts?

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    tj1
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    Quote Originally Posted by drtumolo View Post
    I have a 54" blower mounted on a 2305 tractor. It is my only tool for clearing my 1300 foot gravel driveway. It seems to break sheer bolts very easy. Has anyone tried grade 8 bolts instead of the grade 5 bolts?
    I wouldn't try grade 8 bolts unless you want to break the thing. Just think of replacing the gear box... what's that around 8 bills? Stick with the grade 5's even though you seem to shear a lot of them.. Maybe lower your wear shoes if stones are the issue? I doubt you will find anyone using grade 8 shear bolts.. I was surprised to hear they were grade 5's!! Good luck.
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    Jeff

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    ^^^^^^^^^2x^^^^^^^^^^tractor supply has grade 2....I would use them, pain to change out but protects equipment. Which ones are snapping auger or impeller. Besides lowering skids to help with stones, could speed/ feedrate be an issue?
    Last edited by fdmars; 01-17-2018 at 08:02 AM.
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    Quote Originally Posted by drtumolo View Post
    I have a 54" blower mounted on a 2305 tractor. It is my only tool for clearing my 1300 foot gravel driveway. It seems to break sheer bolts very easy. Has anyone tried grade 8 bolts instead of the grade 5 bolts?
    Are you breaking the auger bolts or the impeller bolt? Can you identify why the bolts are breaking? Are you hitting stones or other hard objects?

    I have the 54" blower also. This is my 5th season with it. I have a long gravel driveway and I also clear 4 other driveways. One year we had over 24" and I cleared off my entire yard with the blower. I have never broken a shear bolt (knock on wood).
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    It is the auger bolts that are breaking. They are even breaking when I hold the blower a few inches off the ground and try to clear snow. I think I found the problem. The bolts I have are grade 5 but threaded all the way. The pictures I see online show a shouldered bolt. The charts I found show the shoulder would be much stronger then the threaded bolt I was using.

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    tj1
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    Quote Originally Posted by drtumolo View Post
    It is the auger bolts that are breaking. They are even breaking when I hold the blower a few inches off the ground and try to clear snow. I think I found the problem. The bolts I have are grade 5 but threaded all the way. The pictures I see online show a shouldered bolt. The charts I found show the shoulder would be much stronger then the threaded bolt I was using.
    Good luck with this issue, as mentioned maybe the feed rate and heavy wet snow is also causing this???? I Have never broken a shear bolt but now that I said it.................. I've had hidden branches go right thru the blower and never broke a bolt. Lucky? Maybe. I'm knocking on my desk right now!
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    Jeff

    X 738 4X4/ 54" mower deck, 47" two stage snow thrower/ linear actuator spout control, Curtis hard side cab/heater, JD roof top LED work lights, Curtis fuse block, rear roof light connected to dash light switch and reverse lights, additional 20amp alternator, Curtis fast Cast 2000 sander custom fitted to tractor/ vibrator for use with dry sand, Kubota L39 TLB, JD 450 E dozer, Husky 18 horse/ 48" mower deck/Berco 42" two stage snow thrower/Berco soft side cab, Kubota RTV500-H.

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    Quote Originally Posted by drtumolo View Post
    It is the auger bolts that are breaking. They are even breaking when I hold the blower a few inches off the ground and try to clear snow. I think I found the problem. The bolts I have are grade 5 but threaded all the way. The pictures I see online show a shouldered bolt. The charts I found show the shoulder would be much stronger then the threaded bolt I was using.
    Are you using the OEM JD shear bolts and nuts? There are four spares mounted on the blower housing. After that they are only $0.75 (bolt+nut) from JD dealer.

    Part Number: 19H1914
    Part Price: 0.46 USD Each

    Click image for larger version. 

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    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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    I agree something isn't notmal. I have only broke one or 2 in the last 10 years, and thar was when engaging the pto. Is your driveway big rocks? Mine is primarily limestone screenings.
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    I've broken shear bolts over the years , mainly going to fast and going into snow that had melted and refrozen like a brick.

    Please don't use grade 8 or you will really be replacing a lot more than shear bolts. Use shoulder bolts and here lately I been using a nylon lock nut instead of just tightening the bolt or putting on two nuts to get it tightened. Using the nylon lock nut seems to work the best, along with going a tad slower in heavy or frozen snow, such as near a main road and torn by a plow truck. I've used the blower now going on 4 winters and have only broken 1 shear bolt, knock on wood., I have a 47 not a 54 but believe same animal just a tad wider.
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    I think for these I would go to the dealer. Full threaded or shoulder or grade all play into it. I am sure the mechanical engineers who design them take the differences in torque a certain size and model can handle, hence the different styles.

    The diagram above shows a shoulder, I picked some up at the dealer today and they were threaded all the way up. They are marked grade 5 but also have a S stamped in. A lot of manufacturers do stamp there logo on the head so perhaps that is what the S is, seemed strange though it is a sheer bolt and it is marked S.
    Attached Thumbnails Attached Thumbnails 2018-01-17 11.48.20.jpg   2018-01-17 11.48.15.jpg  
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