Most farmall 300 tractors have a 2-1/2 inch diameter rear axle. Small percent of 300 tractors have whats called a heavy axle or 2-3/4 inch diameter axle. Thats the same size as a M axle and the cast centers will work on both axles. Depending on the type wheel installed if the bolt heads are cut on the axle clamp or clamps they will loosen on the axle but won't come out of the wheel. So then bolts have to be cut off agian after the wheel is removed from the axle to get the clamps out. Then there's the job of getting the cut bolts out of the clamps if reuseing. If the 300 has 8 spoke cast wheels the clamps will be different from a 6 spoke used on a M. Unless the 6 spoke wheel is a later replacement from IH then the 6 and 8 spoke wheels for a 2-3/4 inch axle use the same axle clamps. Thats not common though. You may already know the 6 and 8 spoke wheels use a different rim. Also if you mean the rim clamps, if the 6 spoke wheel is turned right on the axle just the nuts and clamps on one side need removed. On the 8 spoke wheel one nut and bolt per clamp.
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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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