You hydraulic system is staying on demand. In other words under pressure. First thing is look at the ends of your hydraulic valves. There is a flat on a stem to turn valve from double action to single action. Often times the roll pin gets broken or bent allowing stem to be turned too far. If all valves check ok, then you have a problem in the regulator valve block. It is the valve with four bolts on cover. Under cover is heavy spring so caution if you take it off. I use longer bolts in two corners. You will find a screwdriver slotted orfice with screen. It is probably plugged. You will need new gasket though if you take cover off nine times out of ten.
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