Mark is right, if the worm gear ratio is very high ( and on the Fordsons, it was probably in the range of 60:1 or 100:1) the tractor wouldn't immediately drop back down when you hit the clutch. I have specified many 60:1 worm gears on elevators just so the elelvator wouldn't run backward if there was a power interruption. However, if there is vibration coming through the drive mount, the thing will slowly (at first) reverse. The other post was right on in that the torque at the axle is what cause a rear-up. Ever notice how short a Fordson was, not enough weight in the front end for the horsepower and you want your pull point under the axle to keep the front down. Yes the worm gears could take a lot of shock but are very inefficient, creating excessive heat. The right angle gear and pinion is not nearly as inefficient as the worm gear, don't confuse the two. Their efficiency is up near that of spur gears of that ratio. And helical bevel sets are very quiet. Even John Deer, clinging to the paralell crankshaft and gear sets, used right angles in the steering, coolling fan and PTO, without them they would look like a Waterloo Boy! Leonard
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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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