In Reply to: Re: NAA lift won't move posted by JMOR on April 27, 2017 at 14:37:03:
OK. Will try next time I have the lift cover off.
I put a spring under the acorn nut. After trying several lengths, the lift appear to mostly work. However, it DRIFTS UP without any load. At first, I thought this indicated too strong a spring so I cut off half a turn until the spring pressure was very weak. If I remove the spring, the upward drift stops (that is, doesn't work at all).
Later I noticed that if I stand on the lift arm (200 lb) and the control lever is down, it will drift down as fluid is released from the ram cylinder. If I raise the control lever, the lift will stop going down, corresponding to the position of the control lever. But it cannot lift me.
I started over with a much longer spring. The lift drifts up but if I stand on it, it acts normally. When the lever is down, the lift sinks slowly at first, then faster as the lift nears the bottom of its range and lever/torque of the lift arms has a greater effect. When I pull up on the control lever (still in position mode) the lift goes up. If I turn up the idle, the response is a little more snappy but the difference isn't huge.
Any ideas on the upward drift?