^^^^
That's true, also. When increasing the RPMs the speed would go up by the same amount. 2.1 is indeed kph, (mph * 1.6) .The speed at 2000 RPMs would be 2.6... or way too fast.
The question I have been asking myself since posting this though; I put about 250 operating hours per year on my tractor. While I am bringing the Ferguson home this spring, do I really want to replace my 5 YO Kubota with a machine that's older than I am?
1977 AC 7000, 1980 JD 2840, 1963 Case 930, 1963 Ford 4000, 1943 Case SC, Case 530CK backhoe
I run a 4ft tiller with an early 60's Ford 4000 (4 cylinder- 4 speed trans). My 1st gear is listed as 3.13 mph at PTO speed. Yes- it is a little too fast but it gets the job done if I make several passes and even till in reverse. I have the sherman underdrive/overdrive but it does not help because my PTO is transmission driven- so using the underdrive slows down the PTO just as much as it does the ground speed. I have a larger JD tractor that has a low gear of around 1.5 mph at PTO speed- and it works much better.
The speed graph on TractorData.com in not very clear. The values shown are ground speed at 2000 rpm in Mph and (Kph). The 1000 rpm would be 1/2 the the value shown as indicated by the shading in each graph. In 1st gear low the ground speed will be 0.65 mph at 1000 rpm and 1.3 mph at 2000 rpm
I had a TE 20 and it was slow in 1 st gear but the problem was to run anything the RPM's had to be increased and this made the ground speed to high. I tried my 6 foot tiller on it once but it was way to fast