Posted by coonie minnie on May 26, 2013 at 10:20:11 from (166.182.3.74):
In Reply to: Why 540 rpm pto? posted by bernieinva on May 26, 2013 at 04:06:27:
It does seem goofy to use such an unusual number...
I'm guessing ASAE adopted something that the first manufacturer had already come up with, and that was probably just how the proposed gearing matched to engine speed. Think about it... there was no implement already designed so you had free reign. Is this the specs for the first IH stuff?
Same with the 3 pt hitch. What is now standard was first invented and then patented by Harry Ferguson. Is was much later that it became a "standard".
It took a while for early PTOs to have a common size, too. Early Bs and I believe F12s had a 1 1/8 shaft, and most Gs had a larger than standard shaft.
And then came positioning with the drawbar as far as height and distance from hitch pin hole.
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