I believe the "standard" power takeoff dimensions were adapted sometime in the late 1940s. I don't have time to search this now, but someone might be able to come up with something on the net to confirm the date. As I recall, the new standards were known as "SAE....." We have all seen Farmall H and M tractors from the late 40s and early 50s with the little extension box behind the transmission. This was a quick fix by IHC (it worked just fine). I used two tractors with the old non-standard PTO, an F-12 and an F-20. The machines that were being pulled and powered had to be adapted to the particular tractor. The mounted mowers had shafts of the right lengths. Pull-behind implements (combines, corn binders, for example) sometimes had a telescoping shaft that could be adjusted forward and aft to give it the right length. It has been a LONG time since I pulled a PTO-driven combine or corn binder, so if I don't have this right, somebody please correct me. One of the things I remember well was the shielding, which was rigid, unlike the modern shields which encircle the shaft. Some people couldn't be bothered with the shielding, which sometimes meant serious accidents. Getting your clothing wrapped up in a shaft rotating at 500-plus RPMS could mean getting beaten to death against the drawbar or the machine.
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