Re: John Deere G PTO

Posted by JD70Jim on February 01, 2001 at 18:42:48 from (64.197.39.235):

In Reply to: John Deere G PTO posted by B C ROCKER on February 01, 2001 at 16:44:36:

Back in the olden days prior to the ASAE convention on standards, there were several different sizes of PTO shaft. Ford had an undersized shaft, and the G, because it was supposed to be "Heavy Duty" had a larger shaft.

The speed at which the PTO turned was not standardized either, although most were close to 540.

In order to promote interbrand compatability, so that you could hook up any brand of implement to any other brand of tractor and have the machinery operate correctly and at an appropriate speed, a body which I believe is called the ASAE or American Society of Agricultural Engineers developed uniform standards for things like drawbar height, pto speed, pto location, size and shape of pto shaft, and eventually 3 point hitch specifications. All of the manufacurers then adopted these standards and had to change their equipment to match, doing away with odd size pto shafts and things like the very high pto location on some tractors ( Massey Harris comes to mind)

Hope this helps.

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