Was cutting the grass and the mower stopped moving forward, will not back either
I can put it in neutral and push it,

Start by checking your drive belt for tension. 917287030 CRAFTSMAN TRACTOR Manual | SearsPartsDirect (http://www.searspartsdirect.com/partsdirect/user-manuals/17055/917287030-Craftsman-Parts-TRACTOR-manual?pathRender=fromManualTabPage) The drive belt goes around the engine pulley closest to the engine, other blade is to the blades