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I have recently purchased a bachmann 2-10-0 used.  I know little about the history of this locomotive. Initially it ran fine, but after a colision with a piece of scenery on another layout (layout owner has some rocks that either protrude into the NMRA gage profile, or Bachmann doesn't pay attention to the profile), the locomotive started having the above symptoms. I disassembled the locomotive, disconnected the drive train from the wheels.  The motor runs just fine, no apparent issues with the worm gear or drive belt. I carefully inspected the wheels, and noted that the main drive gear appears to have one or more teeth that have a concave shape to them.  I believe this is causing the worm to skip a tooth about once per revolution of the locomotive.  I can find no other apparent damage to the drive train.  The side rods do not appear to be bent in any way, and the power pick ups are in their proper positions. I have acquired a spare set of wheels with side rods.  Should I replace the the wheels as a set or just the center one with the blind flanges (the one that contains the drive gear).
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