release screw closed,motor sounds like it's pumping & ram moves slightly, then stops. movement is not smooth, almost like it is starving for fluid. resevoir is full, filled with the motor tilted all the way up. this unit set up for about 2 years with no movement, i suspect some of the seals got hard and are letting the fluid bypass, but everyone i talk to says these units are almost non-serviceable, except motor failure.
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