On many Craftsman tractorsthey like to use nylon bushings in their steering. One of the bushings that tends to be a problem is the upper bushing in the lower end of the steering shaft. This bushing tends to ride up the only thing that holds it in place is a electrical plastic tie. When this bushing moves out of place the play in the steering will also increase, but it increases friction and makes the steering very hard.
I had a simular problem with my 1989 Sears GT, I ended up removing the shaft disassembling the working section and cutting in a slot for a spring e-clip on the lathe. I pre-greased all of the parts and installed grease fittings ( 3 in all) along the shaft.
I don't know if yours is made the same way, if so, check to see of the tie has slipped and reinstall, you may even be able to use a hose clamp. It only acts as a stop. Also do as Kenny has suggested.
