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 - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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