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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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