Posted by athol carr on April 30, 2017 at 18:12:16 from (122.57.236.186):
In Reply to: Why 540 RPM? posted by In-too-deep on April 27, 2017 at 19:35:22:
The IHC 10-20 was one of the first tractors to have a PTO as a standard attachment. It was running at 540 rpm. The coupling was a 1 inch left-hand thread. The Farmall PTO ran a bit slower but used a 1-1/8 inch 6 spline shaft. The later F-20 followed suit. The F-30 had a 1-3/8 inch 6 spline shaft. The F-12 used 540 rpm and 1-1/8 6 spline shaft. Other brands of tractors were slower to provide a PTO and all sorts of speeds and couplings were in use. When the 1938 standard was introduced the IHC 540 =/- 10% became the standard (first in wins) and 1-1/8 inch for lower powered tractors and 1-3/8 inch shafts for the bigger tractors was the standard. Later IHC shifted all to 1-3/8 inch shafts about 1943 to stop farmers having to have different couplings for different sized tractors. If one looks at harvester manuals from the 1930s and early 1940s one will see the pages of different PTO couplings to suit different tractors. The location for PTO shaft end to drawbar pivot was another issue and even IHC had to build adapters for the drawbars to meet the standard.
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