I had a pulley come off the mule drive once on a 147 Cub.
It never occurred to me the bearing had seized causing it to unscrew itself, it was not smoking or anything funny I could see.
Since this tractor was a recent purchase, used, I just thought the bolt just vibrated out.
When I picked it up I heard my fingers sizzle.
Surprisingly it did not leave a scar.
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