I've worked on quite a few snow blowers, but they're a little bigger than yours. 85w-90 should work fine in your gear box. That's what we use, but it rarely gets down to 0* when we're blowing. If it gets colder, synthetic works good. I would drill new holes for the shear bolt, if the flanges are soft enough to drill. When the holes get sloppy, you can shear the bolts just from the shock load when you start it. I don't like to use grade 2 bolts, because they stretch before they break, which will mess up the bolt holes. I've also seen them get stuck between the flanges and try to push them apart. Use a grade 5 and cut a groove around the bolt where the two flange halves meet. That will help it break cleanly and in the right place. The best way to do it is with a parting tool in a lathe, but a die grinder with a cutoff wheel while spinning it in a drill press works too.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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