GP7 Not moving - power on

An item # would help. I.e. 6-#####.

It's possible you loco has Liondrive trucks. If so, turning the truck 180 degrees will allow it to release from the chassis exposing the plastic yoke that is fasten onto the end of the motor shaft.

These have been known to come loose on the shaft allowing the motor to spin freely. Removing the yoke and adding a drop of loctite on to the shaft and replacing was the recommended fix.

I was attempting to run Lionel 6-38430 ( Polar Railroad).

Yes. This locomotive has Liondrive trucks.

If you turn it over and look closely. Rotate the trucks and watch for the tabs on to line up, and drop through the slots in the chassis, and the truck will release.

It might only work in one direction depending on where the slots are. Also be careful with the wires going to the electrocoupler.

This is an easy first step, to finding the issue,  before removing the shell.

Thanks a lot, I’ll go give it a look and report back.

Well I don’t see the plastic yoke being a problem but when I took off both trucks, only 1 had the drive coupler.  That doesn’t seem right.

That's not right. You can contact Lionel and get another Liondrive coupling.

I would still make sure the one that is there isn't slipping.

https://www.lionelsupport.com/search?keywords=38430

It will likely be pricey with flat rate shipping . It's possible another forum member might have an extra they could drop in an envelope at a better price.

Maybe a WTB ad wouldn't hurt.

Thanks a lot for the help.

You were right, I checked the yoke was loose, so these two finds might be the issue.

I will try the Loctite and second drive coupling.