I just purchased a Lionel 2337 that I place on a track and it will occasionally bind up and growl almost like gears in the drive truck are binding. As a newbie to fixing these engines I was wondering which gears should I look at that would most likely cause this problem. It starts real smooth and runs fine, then for a short distance of a foot or two it will slow down and eminate sounds like binding gears. Do shafts wear on these units or should I loook for worn gear teeth? Thanks for any input. Yes , I have lubricated it before running it.
Michael