i have a ~2002 snapper 48" belt drive wb .. and the drive belt, the one from the clutch to the deck keeps wearing out and busting in 50 hours. i looked with the blades engaged and the belt tensioner pulley that swivels on that little arm is "vibrating" back and forth really fast .. about 1" of travel. causes a decent amount of vibration. with the belt off it doesnt seem like the bushings for that little arm have play or anything. then there is that big spring that pulls the arm to keep the belt tensioner pully on the belt tight; spring seems fine but i guess i wouldnt know how strong it should be. what parts do you guys think i should try replacing? i read on here a while back someone said old pulleys wear belts down fast, but i dunno, the only thing that seems possible is that the spring isnt tight enough. thanks, hopefully somebody has seen this before.