Author Topic: Motor hum/noise from Bachmann OO 4F after installing decoder  (Read 328 times)

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Southern1970

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Hi all,
A friend of mine has a Bachmann 4F OO locomotive, that ran fine when bought new.  He purchased the lokpilot 21pin decoder, which was a simple enough install (after finally figuring out how to open the tender).  He later told me that the locomotive moved fine in reverse, but when moving forward there is a noticeable hum/noise coming from the motor.  Is this something I’d fix by changing the CVs to increase the starting voltage?
Cheers
Allan