I have a issue with the drive train on f7/f9's Recently two that I have started to vibrate and are both very noisy, they sometimes will even not move. I checked the drive trucks and all the gears are okay. I checked the drive shafts: one is a dual flywheel the other is a single. Checking the shafts and they appear need to be replaced, okay I will order them from Bachmann, fine. My problem though the coupling part inside the flywheels also show some wear, that could count for the noise . I have another 2 month f7 and you can barely it running.Does anyone know to get them. I have talked to Bachmann and they told me they are not avaliable. Both of these are fairly recent produced. Any ideas out there, it would be a shame, and expensive to have to replace them.
More info
both are dc.