I had the same problem with my 15 year old Craftsman lawn tractor. I tried to adjust the steering travel but it gave me marginal relief for a year until the steering failed with my steering wheel spinning freely and the wheels free to go left and right. The left bias for steering indicates that the steering shaft pinion weld was shearing prior to failure.
I took the steering apart and found that the drive pinion gear was sheared off the end of the steering shaft at the weld. I replaced the shaft and sector gear to fix this issue.
This fix requires good amount of mechanical disassembly to get the replacement parts in place so you might need to go to a shop to get a mechanic to fix this if you aren't set up for this kind of fix by disconnecting the mower deck and jacking up the front end to access the steering gear assembly and steering arm links.
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