Pulling from the a point above the axle is never a good idea as it does greatly increase the risk of overturning.
And yes the Ferguson System does operate as described for latteral shock loads. Again you are correct in normal operation pulling a implement through the ground the lift will rise or let the suction force pull the implement deeper. However, if an object is struck (shock load) the top link loads up in compression and pushes past the normal travel range, compressing that big spring on the back and the hydraulic pressure is released immediatly.
You are also correct in that the system does not rely on the compressive force of the top link to push the front down. It's main result is the loss of hydraulic pressure, by opening the pressure relief valve.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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