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 - 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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