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Only things I've noticed different on various year models that have not already been covered are, some of the parts had running changes/upgrades, like the previously mentioned PTO, the oil filter size, the lower shaft front seal retainer for the transmission originally was pot metal, and while substantially lighter than the later one, it was also much weaker, and thus prone to breakage when torqued down, especially if done so by Charles Atlas. The later one is a direct bolt on replacement though, and much stouter. Speaking of lighter, the earlier tractors generally had lighter castings in some areas, especially during the war years, when all metals were rationed and thus very hard to get. For instance, on my July, 1940 manufactured H, the transmission top cover is light enough I can lift it on and off by myself, but later model ones I have always needed help to do so. Also, the early models had a different key system to hold the rear casters in place on the axles, using a separate key top and bottom instead of the one in the hub being cast in like on the later models. I have a set of 1946 coded casters done like this.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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