the pressure relief system is basically a saftey valve in the system. they are set to open when hydraulic ressure exceeds a pre-determined maximum. it is a valve with a spring on it, and when the pressure reaches a certain point, the valve opens venting hydraulic fluid to the return. if it wasnt in the system, when you reach the end of the cylinder stroke, or tried to do something beyond the capability of the system, pump damage, blown hoses, ect can occur. will the cylinder hold a load or does it creep down? if it creeps, that is a good sign of a bad cylinder.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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