My Lionel 623 Switcher stopped running and just started humming and kicked out the #91 circuit breaker. I took the motor apart and disassembled/cleaned the armature (i.e. cleaned the face, the thrust bearings and the thrust washers). I also replaced the brushes and greased the armature gear and the drive gear. After re-assembly, the switcher ran great for 2 days and then stopped again just like before. I repeated the cleaning procedure but the switcher still didn't run. I disconnected the motor from the e-unit and connected the motor directly to track power. The motor doesn't run all the time. When it does run, it will run in either direction at 7 volts. When I increase the voltage slowly up to 10-12 volts, the RPM of the motor does not increase and finally stops and hums. I have attached a video demonstrating this. Has anyone on the forum experienced this problem and knows what is causing the problem?
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