wear of deere deck pulley cover causing belt damage

I'm puzzled as to exactly what caused the wear.

[@waynestefinashen239]

So did the new belt and belt covers work? Enjoyed this video well done.

[@gadasavideos8564]

Maybe. Maybe not. He came by this spring with the belt broken but I think that the belt had jammed because about 6 inches had worn down symmetrically until it was nothing left and broke. He had a 68$ oem belt with him. I installed it and noticed a lot of crap around the spindle and noted that the new covers had started to wear. I felt that the smaller engagement pulley was a bit stiff so was going to replace it. Unfortunately I ordered the wrong pulley so had to reorder. Haven't got around to the replacement though. As of yesterday he's still cutting with the oem belt.