I have a PTO housing with the identical groove in it, and it wasn't there before my father bought the mower. The Kosch pulley cut the groove all by itself. Either the pulley got a little loose, or something bent it, or somebody pushed it a little too far on to the shaft. If you check you can probably see that the edge of the pulley is polished , or even sharpened a little where it rubbed.
I don't know which pulley hub you have, but if you are going to use the mower very much, you should make sure that the pulley is as tight as possible. If it runs loose it will eventually, (in ten or twenty years), destroy the splines on the PTO shaft. Long before that it will wobble and make noise, as well as cutting th groove deeper into the housing.
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