we have a 4 stop with 3 stage telescopic jacks. When you leave a floor or level into a floor you get a lot of vibration. If you manual lower the unit it will shutter at a certin speed also. We have repacked,replaced regulator valves, and bearind surfaces. Replumed jacks and added shims to level the jacks out. We have added pro-vantage to the oil and piston surfaces. No luck at all. The unit runs hot but not all that bad. And resinking has no effect on this problem. Anyone seen this before. Thanks in advance Dan
