But in this case the load remains the same but the pressure still changes. Since we know that PSI times the area gives us the total force, then if the force remains the same but the pressure changes, the area to which the pressure is applied must have changed. The way that happens in a cylinder is when the oil leaks by the piston the pressure is still trying to push the ram out of the cylinder but now effectively has only the area of the ram itself to push against.
Loader cylinders normally have rather large rams compared to cylinder borer so a pressure difference of 2 to 3 time is normal when they leak. With larger bore cylinders where the difference may be 10 to 1 it is possible to blow hoses or even destroy the cylinder itself if it were to leak without any relief valve to protect it.
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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