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rear hub shear pins

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My B10, ~1965, has 6 roll pins mounting the differential gear to the hub on the right side. It's just as your diagram shows with the adjusting bolts, metal bearings and nylon bearing, and the pins between item 11 and 10. These pins act a shear pins. When they shear, some that don't break up are embedded on the hub side. I've tried drilling (ruined several bits) and easy outs to no success. I've had this tractor for about 14 years. Great machine, but I've had to deal with these pins shearing a couple of times.

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