The backside cannot be 100 percent full of oil with the cylinder extended. There was not enough oil in the front of the cylinder to begin with to fill that void. The rod end holds less oil because of the space the rod takes up in the bore. You're ignoring my simple example. Take a double acting cylinder. Take the piston out and throw it away. Insert the rod halfway into the cylinder. Fill the cylinder completely with oil and cap both ports. There's no piston at all, so that's a big seal leak. You can't move the rod in or out. You can't push it in because there's no place for the displaced oil to go. You can't pull it out because there's no oil to fill the void it leaves when coming out. It's hydraulically locked. Having a piston on the rod makes no difference. The only way a capped cylinder can move is to introduce more air oir oil into it as it extends. It's simple, basic physics. I don't make the laws.
Take a cylinder with the piston centered and fill both ends with oil. Run an oil filled hose between the 2 ports. It still cannot move because of the displacement difference on each side of the piston.
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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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