@Blackjack4935 posted:Jon G, do you know where I can buy one of those replacement gear assemblies? The MTH website has a parts search, but I can't find the option to buy a specific part. I was able to find this part, which appears to be similar to what you described, but the sizes of the gears don't look like they match the ones on my blue comet. Is there a different part I should be looking for?
The part you identified is for Std Gauge ProtoDrive motors. They have both the individual O-gauge worm driven gears and the whole assembly. Once you replace it with the new version, the worm driven gear will be easily replaceable. Deb had a bag with those new gear assemblies and there is a part number assigned, but it may not have been posted yet. Still furloughed, so I can't help with the part number, but Midge can check with Deb if you email her.
As for why it wore out, it's sacrificial so the worm gear on the motor doesn't wear out. But, it's Chinese brass, so don't pull heavy loads, don't run it in a museum setting and keep it lubricated (not the easiest thing to do).
