So I just came in from checking it out. Working alone, I was able to turn the impeller to where the red warning label was straight up on the input shaft plastic covering. One full turn of the impeller, sure seems to be three turns of the input shaft, assuming the term input shaft means the pto shaft going into the gear box. Definitely not two nor four. I tried it numerous times with the same result. I went and blew with it for a bit, and tried again with the same results. One full turn on impeller was three turns on at least the plastic covering on the input shaft. Also, for what it's worth, I called two different locations of our local Kubota dealer, and that's where I actually bought the tractor. The first service guy told me that it was to be ran at 540. When I asked him what the 1000 speed was for, he said it was for rear pto equipment that required 1000 rpm. I asked for an example of what that would be on a 29 hp tractor. His example was an 8 foot heavy duty brush hog. When I questioned that, and said no way would it run that, he became somewhat frustrated and said that's what it is for. I then called another location of the same dealer. That service guy was very helpful and knowledgeable about the older models like my 1992. He said "back then", guys would run them at the higher speeds, but you need to be more careful with it, that the chain is spinning real fast at that speed. I asked him too about what that 1000 rpm position was for. His explanation was that it was made also for the European market, and they had equipment designed to run at that speed. Assuming he is correct, that would explain the two speed. Even if not correct, he was much more reassuring that the first guy that said it was for an 8 foot brush hog. I am confused about the what appears to be the three to one ration of input shaft to one turn of the impeller.