.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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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