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#1
01-23-2016, 01:52 PM
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Shear bolts on snowblower fan keep snapping
i have a cub cadet 3185 with a Bercomac two stage snowblower. Ran it last night in about 6" and it did great. Still runs well today with 2 feet on the ground but I keep snapping shear bolts and I am worried I am going to run out.
How tight should these be when replacing? Maybe that is my problem I have been leaving a little play in them should there be? It has a nylon lock nut. I am letting the snow slowly feed in there isnt any rhyme or reason to when they break it seems like it is nearly every 15min. thanks for your input. Sean 
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#2
01-23-2016, 02:06 PM
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Never used a snow blower but I imagine the shear bolt in it is the same as a hay baler or bushog. We always just tighten them reasonably tight, nothing extra. The bolt should sit still, not hold anything together. Do you have the correct size bolt? Too small of a bolt will allow for slop which can cause failure. You are shearing the bolt and not losing the nut, correct? I wouldn't get desperate and use a heavier grade bolt, then you are going to demolish something. As long as the bolt holes are not beat out, I've never seen bolts shear unless you overloaded the machine/hit something. Is everything turning freely?
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2072 w/60" Haban 982 with 3 pt and 60" Haban 1811 with ags and 50C 124 w/hydraulic lift 782 w/mounted sprayer 2284 w/54" mowing deck
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#3
01-23-2016, 02:14 PM
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thanks for the quick reply. The snowblower is new to me but basically unused. So I dont think it is rounded out.
I have been leaving a little play in the bolt. I will get it snug this go round. They are labeled with the matching part number. and appear to be the same as the other bag i got that came with the blower and were also labeled with a matching part number. I am left with the bolt head and about a 1/4 inch of bolt shaft when they break. the nylon lock nut disappears in to the snow. thanks again. Sean
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#4
01-23-2016, 02:20 PM
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Having dealt with shear bolts on farm equipment tighten them up. Don't leave play in them. Don't go crazy tighting them but good and snug. I'd say lesviplay in them is why you keep shearing them.
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Brian April 1979 1200 Quietline 44A deck 1988 1211 customized into a 1288 with a K301AQS 38C deck and a 1864 54” deck . Snow blades 42" and 54" . Brinly disk, brinly plow a cultivator and a $5 brinly yard rake! 
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#5
01-23-2016, 02:31 PM
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I'm kind of thinking he's overtightening them and stretching the bolt. Wonder if he needs a flat washer under the head and nut so as not to cause a stress point?
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2072 w/60" Haban 982 with 3 pt and 60" Haban 1811 with ags and 50C 124 w/hydraulic lift 782 w/mounted sprayer 2284 w/54" mowing deck
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#6
01-23-2016, 02:54 PM
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my 450 kept busting them in even light snow i put 5/16 inch grade 2 bolts in them and they seem to be holding up ok. and they do shear when you hit a ice chunk or something so they dont seem to be too hard
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982D kwik-way loader w/3 spool control and front and rear remotes,2182, 1812 cat 0, 1440 puller, 3185 grass killer, 2x 450s, QA42, 364, tiller
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