Same problem with the mid 90's Channenger.No axle bearings .Just a cast slot in the truck that does not fit the axle very well.Lots of play for and aft.Seems their designe is to be loose along with the slop in the side rods makes even slop.Aparently you may have one that is tighter then the other creating a imbalance of the slop.These are basically a cheap as you can get in a designe espeshally with the cost of them.They give you the great detail on those alleghneys but rip you on the final drive period. Say it like it it and their build shows this.Wish there was a redesigne with bearings on the axles do do it the right way .Other then that find the imbalance and make their sloppy final drive even and lube them good since the axle material wears into the soft cast white metal to create more of an imbalance.Shame on them for cost cutting in this way!
I agree with Don, bent axle, slight quartering problem, or axle not centered in the wheel so that the wheel acts a bit like a cam. Not sure which, seems to be a bit of the bent axle and centering in combination in a couple of instances. I see problems with the third, fifth, and sixth driver axles at a quick glance.
As for getting no response, I would insist that the agent of the manufacturer/importer, that is, your selling dealer, take the locomotive back and either refund your money or send a replacement that he knows works properly.
Other than that, I am surprised by your story. I would have expected at least one of the entities to have responded and have been quite willing to help you by now. I have no further suggestions other than contacting your credit card holder, if you used one for the purchase, and try to get the charge reversed to you by way of a refund if that is possible.
Don - Specializing in layout DC->DCC conversions
Modeling C&O transition era and steel industries There's Nothing Like Big Steam!
My first choice of contacts would be the sellor (Eurolokshop?) to see if they can do anything, especially within the first year of purchase.
Jay
C-415 Build: https://imageshack.com/a/tShC/1
Other builds: https://imageshack.com/my/albums
My apology - this is my second video on you tube. I hope now it is public.
Hrvoje
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