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I installed my hydr cylinder as well on my MH30. It sits under the seat and has a single leaver. The leaver is spring loaded and floats at center and to go up I pull on it, and down push. Actually what you describe for "down" is what I'm looking for right now because I have a blower and would like it to dead drop for deeper penetration before pushing. The down on mine works at the same speed as up pressure as it should do. The only "O" ring seal I had to replace because of a steady drop leak was on the 1/2in stop shaft at the bottom of the cylinder. In order to do that I had to remove the screws on the seal retaining plate to get at it, but was a simple job. However the cylinder still worked ok when it was leaking. I'm no expert but it sounds like you need a
standard adjustment done on the cylinder itself. Did you purchase the cylinder in that condition or did it just start malfunctioning while you had it? What I'm getting at is that the prev owner may have intentially adjusted it that way to dead drop on "down" instead of a 2 way. That could be done by allowing some check ball to remain open thereby bypassing the cylinder. Any hydr shop would check it out for a few bucks, but I'm pretty sure that's it's just an adjustment. It takes quite a lot to damage these suckers, mostly thru dirty oil. As far a leakage when stopped, that's normal.
Mine goes down halfway in 36 hours which they tell me is pretty good. I'd get it looked at in a MF shop an see what they say otherwise get a manual on MH Hydraulics sold at this site. Check the index on the left.
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