The squealing is being caused by the other end of the armature shaft where it goes through the metal gear cover plate. Look the cover over good and polish out any scratch marks, dress the gear top if rough, and apply grease to the shaft and cover. That should stop the squealing.
Roger
My old lionel 675/2025 engine runs slow. It also makes a squealing, grinding noise. A few weeks ago, the engine stopped running. I cleaned the brushes, commutator, oiled the armature shaft. Put back on track, and it started running again, but slow, with a squealing, grinding sound. Any other options? Ed
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