hcsader when on track testing and looking from the brushplate side testing it make sure the motor is spinning counter clockwise . That is a must and if it is spinning clockwise it will spin and spin making no noise.
How do i know is because i have serviced some of the many i have and resoldered the wire wrong and i called myself names after looking in Greenbergs operating manual in the tender section and realized motor was spinning the wrong way .
It did sound just like yours in your video.
