TX Jim, I don't want to come across as a know it all but I have made my living doing this and am comfortable in my knowledge. Look at it again, you have a cylinder with a leaky packing, it will raise but leaks by, when the ports are closed on the valve the oil from the cylinder base or rod end has no place to go, so........... pressure builds on both sides of the piston as the cylinder leaks down as the upper end oil cannot return to sump as neither can the lower end of the cylinder oil return, so......... pressure builds on both sides of the cylinder due to the unequal volume of oil as the rod moves down and displaces oil from the lower end of the cylinder The cylinder acts like a simple displacement cylinder whose actual surface area is only the rod diameter as the piston size is negated by the leak effectively removing its diameter from the equation. That is why he said it only leaked down till the pressure went to 2500 lbs, when it only took 1000 lb to raise it. Think about it. Not to be smart but that is the way it is. mEl
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Today's Featured Article - The Collection of a Lifetime - by Sherry Schaefer. The larest gathering of orphan tractors ever assembled by one collector will be auctioned off on May 15 in Rock Island, IL. Ed Spiess was a well known tractor buff who spent most of his time dreaming of rare and unknown tractors. His background as an agricultural engineer sparked his interest in the unique attributes of the models built from 1939-1959.
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