Steve has given you the answer to your question, but here is a little more of a theoretical answer or example. Think of the cylinder as a medical syringe, no needle on it for this example. Once fluid is drawn in it and air is removed holding your finger on the end will not let the plunger be pushed in, that is how your cylinder works. Unless fluid leaks by the syringe plunger which is like the cylinder piston and seals or past your finger which is like the hydraulic valve the plunger cannot be pushed in. When the hydraulic remote is in the center position the remote valves are just holding pressure (or should be if not leaking by) the pump is not in the equation at all at this point. The pump only comes into action when flow or pressure is required when you move the remote lever into the raise or lower position. If the action of the cylinder is moving fast enough and with enough force to do the work you want the cylinder to do the pump is fine. I realize the cylinders you are using are likely double acting so the syringe idea is a little simplistic, but still the trapped fluid in the cylinder on both sides of the piston is what makes it work as in hold a position.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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