Well into the '50's, there were several different types of hitches, and the were probably standardized somewhere around 1960. Even today, some are a bit different because of the top link hookup, but the pins and basic sizes are all the same. As for pto hookups, there are several sizes and about three speeds that are used, but one of them is a weird speed that only a few foreign types use. There are again a few different sizes of the pto systems- a small 540 shaft on a few older tractors, and the standard 540 that is pretty much universal today, and 2 different 1000 shafts where the very large HP tractors have a bigger shaft than the mid HP units. There are also a few oddities like the Massey Harris hookup, where the pto shaft was actually higher than the toplink on the tractor, so three point attachments with pto drives were useless. But most everything after about 1960 is built to fit anything....
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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