Posted by Bob on December 15, 2017 at 22:10:10 from (64.255.159.199):
In Reply to: pto rpm posted by 88-1175 on December 15, 2017 at 21:38:07:
"The first industry standard for PTO design was adopted by ASAE (the American Society of Agricultural Engineers) in April 1927. The PTO rotational speed was specified as 536 ± 10 rpm; the direction was clockwise. The speed was later changed to 540 rpm."
Going to the higher PTO speed allows more horsepower to be carried by the same size driveline, NOT sure why they settled on 1000, though.
Typically, when a PTO-driven machine is available in a choice of 540 or 1000 RPM PTO there's a change in gearing, sprockets, or belt sheaves to keep the machine running at close to the same speed with either option.
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