My favorite roundhouse queen, North Star, is back in “his” favorite place again: the workbench.
This time, “he” runs fine for several minutes, gets progressively slower on the curves, and then eventually stops. Power is still flowing, as I can hear the engine whine. If I give the old boy a push, “he’ll” go for a couple yards, stop, and whine some more (petulant little thing!). The same thing happens in reverse. At first, I thought North Star ate his gears (again). Over a couple evenings, though, I placed him on the tracks, and “he” ran fine. Long runs, however, resulted in the slow-stop-whine pattern listed above. I should mention North Star got a new chassis a couple years back with nice metal side rods. I understand these don’t have the gear issues of earlier models.
I am hypothesizing that the motor is somehow rising out of its mount, causing the worm to disengage while we are running this loco, then, over time, it settles back into place. Looking at one of the spare chassis @dansgscale kindly sent last summer, though, I don’t see how this is possible. The motor bolts to the gear box pretty firmly. Does anyone have any better theories or previous experiences that could guide my troubleshooting? We can crack North Star open (again), but, to be frank, beyond shredded gear bits and loose mounting screws, I don’t know what to look for.
Thanks in Advance!