Proto 2K 2-8-8-2

[Schraddel]

e-paw you are not alone:




The motor you pictured ist an Roco motor. And this series has too soft carbon brushes. They tend to fill the spaces between the collector segments. Than it can happen what you described, the loco begins to crawl and at least it stops.
There will be a certain "electric smell" too...

The upper photo shows the type of Roco motor also mounted in your 2-8-8-2. The carbon brushes were worn to tiny pieces only. The collector has heavy burning marks. Sometimes when the burning marks are not too bad, it is possible to clean up the collector and soften its surface by grinding with fine sandpaper. Then fit out with new carbon brushes and new springs for the brushes.

The lower photo shows another type of Roco motor. Here the collector ist completely burnt out and partly desintegrated. Scrap.

E-paw you can try to clip off the brush holders, the red and on the other side the black part, by poking with an small screwdriver. Then you can take a look to the collector.
Otherwise remove the flywheels and the driving shaft receptables. Replace this defective motor with an suitable Mashima with 2.0mm shaft.

Later series of Roco motors have got hardened carbon brushes. Now the durability is no problem anymore. But they are chirping when running.
That is also the explanation why some Athearn Genesis locos chirp, they have Roco motors mounted too.

Greetings Lutz