I have an aftermarket 3 point on my 560. It has single action cylinders and I have been running it off one of the plugs that come out under the seat. Valve is set for single action cylinder. There is a check valve in this circut I believe. It lifts pretty slow though hydraulic pressure is at 1500 pounds and is also slow going down with my weight on it. Today I hooked it to a different circuit and it seemed to lift quite a bit faster and also went down easier. Does the check valve slow down the flow? Or is there anything in the check valve that would cause it to be slower if it needed repair? I have looked at the breakdown in the parts book and can't see why it would cause a problem. the book lists a single or double action check valve for a tractor with fast hitch.