1 1/8″ PTO Shaft and 1 3/8″ PTO Shaft

Why did Ferguson use the 1 1/8″ PTO shaft, and the later 1 3/8″ shaft? At the time the 9N was being designed most tractors had 1 1/8″ PTO shafts, though the switch had begun to 1 3/8″ which was the new ASAE (American Society of Agricultural Engineers) Standard Size. The ASAE also developed standards Read more about 1 1/8″ PTO Shaft and 1 3/8″ PTO Shaft[…]