PAUL - Yes, ASAE standards were at first 1-1/8" 6-spline back in the 1930's, then changed to 1-3/8" 6-spline around 1940 when higher HP tractors were being built, both 540 RPM. Then in the '60's ASAE added the 21-spline 1-3/8" 1000 RPM PTO, and finally, in about 1980 the 1-3/4" 21-spline 1000 RPM spline was added. I could be off on those dates/years, but doing a search on ASABE should get people plenty of reading material. ASAE was American Society of Agricultural Engineers, but they're now known as ASABE, American Society of Ag & Biological Engineers.
So yes, the Cub was non-ASAE standard, and I think all the early non-numbered Cubs & Lo-Boys ran at engine speed correct? In order to get a 540 RPM PTO you had to get one of those HUB CITY reduction boxes that are being HOARDED! I seem to remember most Cubs having a rather small, 6-7 inch dia drive pulley on the PTO to run belly mowers.
Yes, on the adapters, about a month ago when I was at my local C/IH dealer, as I walked out I saw their bin with PTO adapters, they still had the 1-1/8" to 1-3/8" sleeve adapter like most old tractors like Dad's old '39 H needed to run anything, plus 21-spline to 6-spline to run 540 RPM equip at half throttle on 1000 RPM PTO's.
There's a company called GROB Splined Shafts here in WI that makes splined bar stock that matches to internal spline of the SGT's 2000 RPM PTO.
Not to get too far off topic, but IHC really had their act together on their PTO design, BOTH 540 & 1000 RPM shafts were permanently mounted per ASAE spec's and no messing around with hardware, other stub shafts, snap rings, etc required to go from one speed to the other. On a tractor like a 4010, you had to swap stub shafts AND the swinging drawbar to make the change from 540 to 1000 or 1000 to 540.
So yes, the Cub was non-ASAE standard, and I think all the early non-numbered Cubs & Lo-Boys ran at engine speed correct? In order to get a 540 RPM PTO you had to get one of those HUB CITY reduction boxes that are being HOARDED! I seem to remember most Cubs having a rather small, 6-7 inch dia drive pulley on the PTO to run belly mowers.
Yes, on the adapters, about a month ago when I was at my local C/IH dealer, as I walked out I saw their bin with PTO adapters, they still had the 1-1/8" to 1-3/8" sleeve adapter like most old tractors like Dad's old '39 H needed to run anything, plus 21-spline to 6-spline to run 540 RPM equip at half throttle on 1000 RPM PTO's.
There's a company called GROB Splined Shafts here in WI that makes splined bar stock that matches to internal spline of the SGT's 2000 RPM PTO.
Not to get too far off topic, but IHC really had their act together on their PTO design, BOTH 540 & 1000 RPM shafts were permanently mounted per ASAE spec's and no messing around with hardware, other stub shafts, snap rings, etc required to go from one speed to the other. On a tractor like a 4010, you had to swap stub shafts AND the swinging drawbar to make the change from 540 to 1000 or 1000 to 540.