The 540 rpm was the speed of the pto on the IHC 10-20 and it sort of set the standard. As and earlier respondent pointed out IHC was the first to provide a pto as an option. However, the 10-20, 15-30 and later standard tractors used a threaded pto shaft. The Farmall (later known as the Regular) was the first to use the 1-3/8" splined shaft. If one looks at harvester etc. parts books in the 1930s and early 1940s there are an enormous variety of shaft positions, shaft speeds and shaft types and al;l sorts of pto couplings were required for the different tractors. Similar chaos held in the shaft shielding. The 1927 (1928) standard was the first attempt but the 1938 American Society of Agricultural Engineers standard put things into a semblance of order. They still left two shaft sizes, 1-3/8" for the smaller tractors and 1-3/4" for the larger tractors. Still lots of choices on couplings. IH in about 1943 standardized all their pto shafts to the 1-3/4" to simplify farmers life.
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