[john hall]

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?