Just keep in mind that an extended hyd cylinder with plugged ports/hoses and a load on the rod is at static equilibrium...but the fluid pressures are not in equilibrium!
The mechanical force/load on the extended rod is creating a pressure differential across the piston seal. Higher pressure on the bottom of the piston and lower pressure on the rod side of the piston. It is an easy thing to visualize with pressure gages.
If the piston seal cannot maintain the pressure differential (IOW leakage) then the pressures will slowly equalize by virtue of the rod being forced completely into the cylinder and the piston resting on the bottom of the tube (or at any other mechanical travel limiter).
IMHO what you have described is an excellent test to isolate the spool from the piston seal.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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