This is a very non-expert opinion, but I think until you can tighten up the hub to shaft tolerances, you will always have problems, the hub cannot turn on the shaft because it is splined so the only reason the bolt would break would appear to be from movement of the hub caused by hitting a rather solid object. A #2 might actually stretch initially instead of breaking which would allow the hub to be very loose before the bolt actually failed and let the hub fall off. I would imagine it is a very tense moment when the hub actually falls off at speed.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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