It does not say why 540 but according to the American Society of Agriculture Engineers, ASAE Standard. The the rear pto was "Originally developed in 1926 by a conference of engineers representing tractor manufacturers; adopted by ASAE April 1927; revised July 1928" along with revisions in 1931, 1941, 1952, 1958, 1961, 1964, 1966, 1967, 1968, 1969,1973 and 1974. It does not state what the revisions were. I believe the early years were the size of the pto shafts.
In 1976 the 540 and 1000 RPM PTO's were combined into ASAE S204.6.
If someone could come up with a copy of the 1927 ASAE Standards it might have the exact information. Mine is the 1998 edition.
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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