I have begun collecting Standard Gauge Lionel and had a successful rebuild with a #8 a few months ago. However, I have become stumped regarding a rebuild of a #10 with the same motor.
When I apply power, the motor will only run (regardless of direction) if you give the armature a half of turn or so. I also notice that the a "rhythm" develops with and the lever to control the reversing unit flies up an down with the rhythm the armature is making as it runs at full speed. I have made sure the connections are all solid and have replaced the brushes with new ones. I am using brushes #622-121, they worked fine for my #8.
I have been stumped with this because its just not making sense to me. Any help would be greatly appreciated.