I replaced the failed Pittman dome motor last night, and thought I’d post some pictures of the failed gearbox.
The pen tip is pointing to the failed gear in the center of the picture. The teeth are almost stripped flat.
And this is the new motor opened up and how the gearbox should look. Again the gear in question is in the center of the shot. Notice the teeth!
I’m not confident that it will not fail again, and I may need to look at an alternative. I’m hoping the issue was my failed attempt to use batting tape to line the dome bearing to help with traction, but the gear may have been slowly failing with the constant harsh stop/starts on such a small gear. I know of at least one other builder that had a Pittman dome motor fail in the exact same spot.