Posted by big jt on December 16, 2017 at 09:09:07 from (206.72.37.212):
In Reply to: pto rpm posted by 88-1175 on December 15, 2017 at 21:38:07:
Bit of history here as it was explained to me in college.
The main reason we had 540 for so many years is that is the optimum speed that a cutterbar works at. IE 1080 strokes per minute. Any faster and you are just wasting fuel etc as it won't cut anymore grass or grain. Of course binders and sickle mowers were the first implements to use PTO commonly. Much later in the picture came the grain auger but the exact same principle applies here. All you do when cranking up the speed on your auger is tear up equipment, beat up the grain, you won't auger anymore than at 540 or actually 600 comes to mind as the ideal speed but it is in that range.
Putting your M&W nine speed in high won't gain you anything when on the auger.
1000 as others have explained was to allow more power to be transmitted through a 1 3/8 shaft.
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