Posted by Ronnie Budd on August 08, 2017 at 16:22:48 from (184.53.32.151):
In Reply to: Low RPM tractors posted by kmvictor on August 08, 2017 at 09:14:58:
Back in those days, tractor PTO speeds weren't standardized at 540 and 1000 like they are now. Not even the PTO shafts themselves were standardized for size like they are now. There was quite a bit of variation in both, sometimes within the same brand. John Deere did that in the lettered series.
For example, our old Minneapolis Moline's PTO ran at 630 RPM at 1500 RPM crankshaft speed. To use it at 540 meant slowing the engine down to about 1300. Our old MM U operated at 1200 RPM with a similarly fast PTO speed, so slowing it down to 540 meant slowing the engine to 1000 RPM or less.
Other manufacturers had their own schemes. Some even ran 720 RPM PTO speeds. Tractor manufacturers built implements to match their tractors.
As time went on, it made sense for everybody to standardize PTO speeds and shaft sizes so that any make of tractor could run any make of equipment.
As a side note, you can accomplish what you want with any tractor that has a 1000 RPM PTO (if it is powerful enough). My neighbor has been mowing hay for years with a White 105, running the 540 RPM disc mower on his 1000 PTO and throttling back.
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