I have a 2007 Super Z 60" deck and am having problems out of the pump drive belt/ idler pulley. The belt had been slipping of the tension idler pulley and finally tore the belt. I got a new belt and fixed it for the most part. Then there was a noticable "clanging" noise coming from it. Thought it was the pulley so I replaced it. The noise is still there and that belt just shakes all under there when it just sitting idle. Any suggestions? Also, what is the part number for that pump drive tension idler pulley? The one I replaced it with that I got from my dealer was a little wider (where the belt sits againist it).