You ar eboth right. When a piston is leaking it makes a lot more pressure in the system becuase the rod diameter is so small. This higher pressure will force it's way past a pretty good valve. It may also pop the thermal relief on some control valves. A leaking piston with the cylinder under load will overpressure something, sometimes the rod packing.
In reverse, this is the way to move a lightly loaded cylinder fast: you rig it up to apply pressure to both sides of the cylinder and it will extend based on the rod volume displaced. It moves faster because the cylinder, not under load, moves at the pump displacement rate, not because it has pressure on it.
A blocked-in cold system which warms up will try to move the cylinder the same way.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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