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I have a Lionel 6-18302 Great Northern EP-5 with Pulmor motors that has a problem with the driveshaft.

This is a brand new engine that I have had in the basement for a while. When I recently opened this engine the wheels on the train were frozen. After I manually moved the wheels for a while they became looser. I attempted to run the train, but it ran very slowly on the track.

I used some oil on the train which seemed to fix the problem. However, it was short-lived. The train ran perfectly for a bit but now now it does not seem to be running.

The wheels seem to slip on the driveshaft to the motor.

The wheels still spin as they should when manually moved. The horn works well.

I was wondering how to fix this problem? Thanks!
 

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The wheels and the motor drive shaft are not directly connected, the motor has a worm gear on the armature shaft that rotates a worm wheel gear on one of the truck axles. I'm not sure as I don't own one, but perhaps this is of the early era of plastic gears. It's sort of sounding like the worm wheel might be slipping on the powered axle? Can't really say for sure unless you dig into it and get a look at what's going on inside. These drive setups don't really allow you to rotate the wheels by hand easily, so there's a chance you may have stripped the gear out when you were attempting to free up the wheels (especially if it's a plastic gear).
 
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