I was asked by a friend to check this Hiawatha engine and tender, as it did not run. I found it to be missing 4 screws, 2 which were the rear motor mount (which was directly connected to the bottom of the pendulum reverse unit) and 2 at the top of the bracket that holds the pendulum reverse unit in place. These missing screws caused the pendulum reverse unit to be out of position and not work. Replacing the screws to the top of the reverse unit, allowed the motor to run properly. After solving that issue, I replaced the springs and brushes in the motor, added a new headlight, and tested the motor. It ran fine, with the reverse unit operating properly.
I then put the motor back into the boiler and found the reverse unit was sticking. I looked at the forward part of the motor and moved the headlight wire around, as that was in the way of the front of the pendulum and blocking its movement.
Lastly, I tested the whistle in the tender. The armature moved fine, so I knew the large fibre gear that turns it was ok. When I applied power to the unit, nothing. Closer examination revealed that the springs were shot and were not even touching the wires that provided power. New springs and brushes were installed and the whistle motor ran fine as well.
Here is a video of it running. Note how well the reverse unit works.
