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 - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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