I have cleaned the gears and is still grinding. Could this be an electric prolbem with the in coming power?
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These engines are known for this issue, more common then not!
The motors on these had sides that were staked together holding the armature in place.
Over the years the staking on these has loosened up causing the sides of the motor to be out of alignment causing the armature and gearing to bind up.
You have to take the motor out and re-stake all the places where the sides are pressed together. You can see them where the pieces are pressed. Take a small hammer and gently tap the stakes so they are tight!
These 027 diesel motors tend to be troublesome. 1st, does the motor attempt to run both directions when the reverse unit cycles? If so then it is mechanical. 2nd, is the motor frame loose? Can you hold the top of the brushplate with the body removed and wiggle the bottom of the motor frame? What you are looking for is loose stakings where the motor sides are assembled. They must all be tight. 3rd, with a pair of test leads, hold the locomotive frame up and run. While it is running, with your thumb move the black dust cover/lower bearing piece of plastic side to side and see if the motor runs smoother one way. Use a thin piece of plastic or cardboard between the plastic piece and the aluminum side of the motor to hold in place.
