Yes - that is the description of the practical result. What is the physics that produces that difference in behavior?
The key is understanding static pressure. Different cylinder loads produce different static pressures inside the cylinder. The pressure inside a cylinder supporting a 1000# load is double the pressure of that same cylinder supporting a 500# load.
Four SA cylinders connected in parallel are all operating at the same static pressure. So a heavier load on any one causes it to retract and displace oil into the cylinders at a lower pressure causing them to extend.
As we learned earlier a double acting cylinder is "hydraulically locked" in both directions at all times. So even though they are interconnected on a single circuit the static pressure in each one can vary depending on the load they are supporting without displacing any oil into the others.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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