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 Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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