I kinda had this problem but mine isn't a Prowler but an H1 the same engine and clutch. Mine was kinda my fault (ok all my fault) I took mine apart to clean everything and put it back together and within 5mi it backed off enough that it quit pulling. $121.00 later, I am waiting on parts from Alpha-Sports to come in today. I haven't got any answers for it either but I have to get mine back together before this weekend. I guess I am just going to impact the nut on with loctite and pray! I hope someone in the know replies soon!
Hey besharp, I just got off the phone with my dealer and he says to torque the nut to 94ft/lb with some loctite on the shaft. He says it'll come off everytime if it isnt torqued on right! Also, Drive a wooden wedge between the half pulley against the engine and the housing to hold it in place!