Posted by paul on December 16, 2017 at 01:31:29 from (66.60.223.229):
In Reply to: pto rpm posted by 88-1175 on December 15, 2017 at 21:38:07:
Bob has it very good.
To add a bit, it is difficult to transfer over 75-100hp through a typical 540 pto shaft. Unless you get creative and expensive, the metal wants to shear off.....
Those giant grain augers you see to make piles of corn outdoors, they might take 125 hp and they run on 540rpm so they don't need a gearcase..... it's real common to break something, the stub coming out of the tractor, or a gear inside the tractor, with those, it is the limit of what that size and speed of shaft can handle, even with the exotic metals some companies like ihc used to make the parts.
so they went to 1000 rpm so twice as much hp can be transferred. As well 1000 pto seems to have 2 standard size spline patterns....
Actually the first tractors has a small size 540 pto shaft - Ford 9N, Farmall H, etc. they had so little hp the smaller shaft was fine.
A bush hog has a 'best' rotating speed, and it will be geared to that speed. 1000rpm machines do -not- run twice as fast as 540 machines.
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