Posted by greygoat on May 07, 2012 at 06:17:21 from (69.179.77.180):
In Reply to: hydraulics for dump posted by Joel59 on May 07, 2012 at 05:37:33:
Unless you have a special cylinder, made for the porpose, the "Rod end" of the cylinder doesn"t have enough oil to fully raise the larger displacement, "piston end" to it"s full stroke. On almost anything but a special built hydraulic valve, you"ll have 4 ports, an inlet, a return, and 2 work ports. Oil goes to eather work port depending on handle position. a "three way valve" may have 1 work port blocked, or, not used, so when the control handle goes 1 way, a cylinder extends,when handle goes the other way, a cylinder retracts...that is..the weight of the dump box push"s it down, but the oil returns to te reservior, or tank, out of the return port. how to get the oil to go back into the bottom,or piston end of the cylinder, and let the pump suck from that port also, is your problem, maybe you need some check valves in the circuit.
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