The problem turned out to be that in the MIB (memory interface board) Function no. 2, which is minimum lift speed, was set at 22. Default is 18 but the range is 3 to 25. I took a guess and set mine at 7 and now it works great.
How and why it was set at 22 by previous owner or tech is quite the mystery as I can't imagine a senario where an operator would want the minimum lift speed to be pretty much as fast as full speed..... as it was quite difficult to control the positioning the way it was, plus jerky movement of the palletized goods when starting lift sequence via the joystick.
Having said that, it's also a mystery that Yale would even have settings that high in the first place. I mean, it could have been even worse...someone could have set it at 25 in theory. But in what universe would anyone *want* it set at 25 is beyond me.
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