I would pull the cover on the deck and examine the belt and tensioner. As far as PTO belts, I would recommend the True Blue belts. I have used the brand you are using without issue but the others are much better and usually can be found on eBay for $18-24. There is info on this site how to properly adjust that style of mule drive belt tensioner. I've never seen an adjustment screw quite as long as the one in your pic, but that doesn't have anything to do with your issue I'd assume! Do you have any wobble in your center deck spindle pulley? If I remember ( not positive on this ) from when I had that style of deck, the PTO belt goes to the outside of the right front deck hanger as viewed from the front, vs the older deck where the belt was on the inside of both front hangers if that makes sense ??
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