Bachmann N scale 4-8-2 remotor

Model Railroader Electronics and DCC
1

Hello, Has anyone remotored a 4-8-2 N scale. And if so what motor did you use.

this one is a dcc on board loco. I took out the bachmann decoderand wired in a Digitrax DZ143.

And a MRC sound decoder. IT finaly fried the Digitrax decoder. For some reason this motor runs

very HOT. I took it out of loco and ran it freely no load on 9volts with dc transformer and it got so hot

I could barley touch it. But it only drew about 1/16 of an amp. And when I did a full amp load pull

it barley got to 1/2 amp on meter at 12 volts. but it was hot. IT fried both motor wires and decoder.

Are they supposed to get that Hot?

From, Truck

2

Is it supposed to get that hot? No. That means that you have a bind in the drive somewhere.

Your best bet is to send it back to Bachmann.

David B

3

The motor was tested out of locomotive. Thats when I noticed it was getting hot with no load on it.

4

Probably has a shorted winding then. Only option is to replace, it can’t easily be fixed. It’s sort of a runaway problem - the motor stalls due to some reason and one of the windings gets hot enough to melt off the insulation, causing a short (that winding electrically has far fewer turns than a ‘normal’ one, thus less resistence). The shorted winding consistently runs hotter than the others and draws excessive current - possibly what fried the decoder - and if it melts more insulation it can get even ‘shorter’ leading to MORE heat and MORE current until finally the thing melts enough to open circuit.

–Randy