I have a YTH2448, 2005 vintage. Replaced the deck with this: http://www.ebay.com/itm/CRAFTSMAN-48-RIDING-MOWER-DECK-181579-186353-189906-FITS-POULAN-HUSQVARNA-AYP-/331419162114?pt=LH_DefaultDomain_0&hash=item4d2a1f1602
The primary deck belt breaks after 10-15 minutes of use.
The new deck has a tension lever on it that the old one did not.
I'm thinking that the tension lever stretches the belt too much, and causes it to rub on the mounting bracket that's not too far from the idler pulley anyway. Photo shows new deck with tension lever in place.
I thought I'd remove the tension lever. The arm that holds the idler spring will then be in approximately the same position as on the old deck.
Anybody else had this issue?