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Repaired this runs but set trans former full speed train runs half speed. Any idears wood be greatful. Thanks al
 

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If you have the transformer set to full voltage and the engine is running at what appears as half speed we first need to know the voltage measured across the rails of the track when the train is running. Then we know if it is a transformer issue or an engine issue.
 

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If other trains run fine on the same transformer voltage may or may not be an issue. However it would be worth checking.

Check all wire connections.

Make sure there is no play in the fingerboards and they are tight and the fingers are making contact with the barrel.

There should be one spacer on the armature worm gear side.

Make sure the commutator is clean.

Check the brushes for excessive wear.

Check the brush springs they should be approximately 1 inch long.

Hope this information helps.
 

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See if motor is getting hot with full throttle and only running at half speed. Reason I
ask is sounds like my 282. Doing exact thing and it turned out to be a bad armature.
My 282 motor got very hot. I would also make sure all 4 wires are in the prongs of the plug. I have a 336 that runs forward fine but half speed in reverse. If your 290 runs
half speed forwards and reverse then probably not the wires. I think my 336 has a bad wire.
 
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