Sounds like the thrust bearings in the A post are getting bad. On the Ms & SMs I have taken the sector gear & turned it 180º plus done the same on the steering worm gear. The teeth get worn & sloppy & by turning 180º it puts the mesh point on different teeth. I'm not familiar with the 300s but would think you could do the same.
BTW, this can only be done on tractors that have a full sector gear. A lot of the Hs & Ms had a 1/2 sector gear
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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