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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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