Original post by: Daniel Beardsley ,
It's very likely that it's related to the transmission or the drive belt, not the tires. Here's some more info: http://www.mytractorforum.com/14-craftsman-sears-forum/215651-craftsman-yts-3000-wont-move.html * Check the clutch/brake travel. Are you sure you don't have the parking brake set when you are checking belt tension? * Do you have the little finger thingy sticking out of the rear plate that allows you to push by hand. Is that out or in? * It's possible that the pivot for the tensioner has rusted up, if it's been sitting. Getting under and eyeballing it should tell you.