When I said the shear bolt failed I meant it failed to do its job and shear. It did not shear and that is why I had the breakdown. I agree on Fluid Film, been using it for years.The shear bolt failed because you ran over something, like a small rock, newspaper, that lodged and stop the blade long enough for it to shear. That is what you want. just replace it, along with the washer. Don't use a loc nut, just the normal 1/2 inch nut and bolt. Make sure you purchase the correct shear bolt for your snowblower. There is a different shear bolt for the outside and the inside fan. The are about 2 to 3 dollars each. I purchase 10 for 30 dollars, and have had to replace the one on the fan, and the outside. My snowblower is the BX2816. It is the same shear bolt for a lot of Kubota snowblowers.
The factory shear bolts have locknuts includedNo locknut is just asking for trouble, imo. Why suggest that? Overtightening the shear bolt nuts to make sure the bolt remains in place can cause early bolt shearing. I ALWAYS lock washer or nylon locknut the shear bolts, and tighten snugly not too tight.
Without a lock nut or washer those shear bolt nuts would have loosened off regularly, on my machine anyway.
Oh that isn't good. Was it a genuine shear bolt, or just a plain 5/16 bolt. Maybe the previous owner didn't replace it with a genuine shear bolt with lock an lock washer. if you check and find it has a plain bolt, you will understand the cause of the breakdown. The proper shear bolt looks like this.When I said the shear bolt failed I meant it failed to do its job and shear. It did not shear and that is why I had the breakdown. I agree on Fluid Film, been using it for years.
That shear bolt fits 43 models.Oh that isn't good. Was it a genuine shear bolt, or just a plain 5/16 bolt. Maybe the previous owner didn't replace it with a genuine shear bolt with lock an lock washer. if you check and find it has a plain bolt, you will understand the cause of the breakdown. The proper shear bolt looks like this.
Locknuts OR regular nuts with lockwashers, depending on which year I stocked up at the dealer.The factory shear bolts have locknuts included
I bought the blower new, factory shear bolts, here is the failed bolt, it tried to break. Old and new out of package.Oh that isn't good. Was it a genuine shear bolt, or just a plain 5/16 bolt. Maybe the previous owner didn't replace it with a genuine shear bolt with lock an lock washer. if you check and find it has a plain bolt, you will understand the cause of the breakdown. The proper shear bolt looks like this.
The new bolt's threads look to be about 1/8" - 3/16" longer than the failed-to-break bolt threads, or said differently, the new bolt threads go further up the bolt, to where the shear plane is.I bought the blower new, factory shear bolts, here is the failed bolt, it tried to break. Old and new out of package.