Posted by Steve@Advance on March 02, 2019 at 15:03:35 from (66.169.147.211):
In Reply to: Hydraulic Cylinders posted by big_red_man on March 02, 2019 at 14:14:29:
Are you sure pressure is being applied to each side of the cylinder?
If the tractor valve is set up for a one way cylinder, it will only apply pressure to one hose, the other will only be a return to tank.
A true one way cylinder will almost always have a large rod, almost the same size as the bore. The rod seal will not be capable of holding pressure, it only serves as a dust seal.
If you are sure you are getting pressure to each end, and the cylinder is not responding, you will need to check the internal seals.
Disconnect and plug one hose, leave the cylinder port open. Block the cylinder mid way on the stroke, operate the valve to pressure up the attached line. Hold the valve and watch for oil to come out the open port. Once the slack is out and the cylinder is not moving, there should be very little, preferably no oil coming from the open port. You should also hear the engine load and see the line pressure against the blocked cylinder. That proves pressure is being delivered.
Reverse the procedure, remove and cap the attached line, attach the other. Same test, should give the same result.
If oil flows through the cylinder, the piston seals are bad. If the engine/pump do not load, there is no pressure being applied to that circuit.
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