What DCC system are you using? Some have a feature that will allow one DC loco to run. I have not tried it myself, but others have indicated that it does not always work. If you can I would try to run it on straight DC. That will give you confidence that it is a good runner. If it doesn’t run in DC, it won’t run in DCC. If it passes that test then you can add the decoder. If not, then you should take it back to where you got it. Kato usually is very good, but there are always exceptions.
Sounds like another casualty of zero stretching a DC motor on DCC. You can do it but is not good for the motor windings. Either that or the drive shafts fell out of the U joints. My bet is a cooked motor.
If it ran at first, and now doesn’t, you probably left it sitting still or running slowly too long on the DCC track and burned up the motor. I use address 00 to test run things, but I’m in HO. Haven’t burnt anything out yet, but you absolutely cannot just leave the loco sitting there not moving, N scale would be even more prone to burnouts with their smaller motors.
Yikes, it sounds like another example of how DC locos should remain on DC layouts, and DCC locos on DCC layouts. While some may work, it just seems like looking for trouble to me.
To the OP… put the loco in a DC environment and see if it runs - or smokes.
My Son and I have a few Kato N Scale Sd70 ACe’s that we run on his N Scale layout in DC. They do not come DCC equipped, only DCC ready and require a decoder to be installed. In DC mode these locomotives are awesome! Smooth running, strong, reliable, quiet…typical Kato. I personally would be very wary about placing them on a DCC wired layout without a DCC decoder installed lest you damage the engine or fry the existing electronics.
Sorry to leave you haging off the cliff like that, but I hurt my back so I’ve been laid up for a while, what I have done is take the shell off the frame checked it to make sure it was not fried!!! it’s not. I have a friend that is really good with fixing these kinds of problems, So "Miss Katy’ will be on her way back rollin; down the track!!! stay tuned for the latest!!!
Unless one knows what they are doing, DC locos should stick with DC operating layouts, and DCC locos should stay on DCC layouts. There is just too much of a chance to screw things up if they are mixed.
I’m not saying it can’t be done, I’m only saying that the propensity for a problem is pretty high when it is done.