I have a craftsman 12hp model # 917.254241 i have been working on . It has set up for about 5 years. It will not pull ,new belt , I can jack it up and every thing it is working, the big pully on rear axle is spining just fine. But even jacked up the rear tire tries to turn but if you put your hand on it . It just stops. Please help ,the grass is getting high and I don't what to cut with the push mower. Thanks David.