Pulmor motor trouble

Since you said it is new unit, I would suggest taking it for service.  Why mess with a new motor, and possibly void the warranty?

Lube it and check the brushes

I did apply grease to the gears and oiled the axles and roller axles.

I'll take a look under the hood tonight.

 

Just fixed a similar issue on a postwar 2025. The cause: dirty brush holders.

These conventional classic F3s are dual motored and when they were first released many of us found that the gear boxes were completely dry without any lubricant whatsoever.  I have a set of NYC CC F3s which had one gear box lubricated while the other was bone dry.  It would only run in one direction.  I have a GG1 which had the same problem.  Check those gear boxes and if they are only minimally lubricated clean them out and re-lube them with preferably Lucas Red and Tacky but if that is not available use a white lithium grease.  After lubing they should run great.  Hope this helps. 

I put a few drops of oil in the armature resavours and all ran well.
I'll grease the worm gears tomorrow