hum and noise

[cdw5561]

Hello all I recently acquired a Bachmann gp40 with DCC non sound and the engine has a hum to it when applying track power and the motor sounds raspy when running, any ideas on what to look for? I appreciate any help you can provide.

[jward]

There is probably nothing wrong with this locomotive. The decoders used in some of the DCC OnBoard  locomotives make the locomotive sound like a coffee grinder. That is normal. It is not indicative of anything wrong with the locomotive itself, and lubing the gears will not quiet it down. I don't know how to quiet the noise other than replacing the decoder with an aftermarket one.

This grinding sound is different from the high pitched squeal of a non decoder locomotive on DCC track power.