First, no lithium; it is too thick. Unless it is frozen in place, I would suspect that the dashpot is not the problem. Does the mechanism move smoothly by hand? As Larry mentioned earlier, power the mechanism directly from your transformer. This will remove the UCS track and other miscellaneous items from the equation. Keep in mind that the problem could be the chassis ground. Connect one lead of your transformer direct to the mechanism and touch to other lead to the lug from the truck shoes.
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