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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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