Here are a couple of picture of the problem. In this one, the steering wheel is turned to the left, and you can see that the nut on the back of the steering rod is beginning to ride under the clutch linkage. The edge of the clutch pedal is just visible in the lower right corner of the picture.
Needless to say, I've got some work to do to correct this problem. However, since this is not a primary tractor and I can get by with turning right, the repair job may have to wait until fall or winter.