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One possibility - based on my experiences with an Athearn DD40 - is that the metal tab that the chassis bears on is not bent to the correct angle. When I first recieved my DD40 it wobbled badly and had pickup problems - motor would "jerk" at a steady power setting. I discovered that the metal tabs that form the truck pivots were bent - the loco also leant to one side when stood on level track. My solution was to gently bend them back to the correct angle and reassemble the loco - the problem hasn't resurfaced since. Not sure how useful this is, but I hope it helps!
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