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 - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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