.01 mph is really, really slow - about 50 feet per hour. In the 420's first gear you're going about 1.6 mph when the PTO is at 540 rpm. Doing the math gives a necessary PTO speed of only 3 to 4 rpm to back-drive the tractor at .01 mph. This is extremely slow and as a result would mean extremely high torque loads for a given power. For example, to transmit just 3 horsepower at 3 rpm will require a shaft torque of over 5000 ft-lb which would very likely break something. Even if you're talking .1 mph instead of .01 you're still talking about a torque in the PTO shaft of 500 ft-lb which is double what the engine would be able to subject it to.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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