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 - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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