MARX 4000 Diesel not moving

Although my two FMs are a clockwork and a 4-wheel drive, I have an M10005 that has the same motor as yours.  It has always worked fine, and pulls 5 passenger cars easily. It has a weight attached at the rear.  Perhaps yours should also have a weight which is missing.

Need to do the obvious and make sure the drivers are clean with no oily residue on them, also make sure the front wheels are turning freely. Next look to see if any part of the shell is dragging. Then make sure the collector has not been messed with. Make sure it has a bout 3/16" up and down movement. Those short collectors get messed up easily. If all looks right, add some stick on weights up inside the shell.

Steve

Thank You both for responses back. I have cleaned the wheels with my dremel wire wheel attachment, used contact cleaner on the wheels and I added 5 small lathe cutting tools for weight and it will move now but runs so so and has one spot on the track that it stops dead everytime although my other engines don't have a problem at that spot. I have been tweaking the pick up shoe a little but I will check it to make sure it has 3/16 of an inch travel. Guess I should have stuck to my steam engines which run terrific.

Make sure the non-powered wheels are metal. If someone has replaced them with plastic wheels, there will be less electrical contact with the outside rails than there should be.