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You may need to clean the commutator and motor brushes. You will need to remove the plastic cover that holds the brushes and use a pencil eraser to clean the commutator. This can be done without removing the armature from the truck frame. Clean the brushes by rubbing them on an eraser, Brite Boy track cleaner or a piece of wood. To get the brushes back in you must remove the brass contacts on the plastic cover that cover the brush holes. Put the cover in place and insert the brushes and the brush springs. Check to see that the brush springs stick out about 1/16" from the cover. Then install the brass contacts that cover the brush holes. There is one version of this Tyco motor that uses a different type brush holder and is a bear to put back together. You can't install the brushes from the outside. You must insert the brush springs into the brush holes, balance the brushes on the brush springs and lower the rest of the motor assembly onto the cover without knocking the brushes off the springs. Good luck.
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