Claas Rollant 66

I just purchased a class 66 for cheap. When I got it home I noticed one of the rollers don't turn when the pto is on. I took that roller off and it is striped out. Has anybody else ever run into this problem before on a fixed chamber baler? Just woundering if I could just buy the part that was striped out or the whole roller.

Claas Rollant 66