I have had a 36" belt driven Scag mower for about four years now and I am just now starting to have problems. When I went to sharpen my blades I noticed the belt has a crack in it, so I bought a new belt, I have not put it on yet. The mower is bucking in first and second gear but runs great in third gear, will the new belt resolve the bucking problem?? Thanks for any help with this issue!!