Lionel doesn't make any LionChief F-3s. You may be thinking of the LionChief FT engines. Pretty much all DC can-type motors from all the manufacturers are described as maintenance-free motors. They aren't designed to be taken apart and repaired (like the older AC motors were), as H1000 states, but rather are just replaced if they malfunction. I only have LionChief Plus engines (which have cruise control), and every one of them has flywheel-equipped motors.