RAW, whether or not it was true, the worm gear drive was blamed for the Fordson's tendency to flip. When you push the clutch in on a hypoid geared tractor, you instantly remove all torque from the wheels and the front end comes down. Disengaging the clutch on a worm gear, however, effectively sets the brakes on the rear wheels. So there is still torque to hold the front end of the tractor in the air. And if the tractor's front end is rising rapidly, it will have significant angular momentum. It seems reasonable to think that in the right circumstances the angular momentum of the tractor combined with the locked-up rear could cause it to continue to flip after the clutch is disengaged.
I looked into this a little further. It seems that the later Fordsons with the worm gear on the bottom of the differential had a greater tendency to flip. So it seems that the higher CG caused by larger rear wheels was a contributing factor.
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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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