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I have repaired many new and old Lionel engines but this one has me stumped.  The motor just hums when power is applied to it.  It is the front truck from a NW-2 Alaska switcher, the type with the red and green winding in the field.  Anyone know the trick to make this run.  The field has continuity in both windings, the armature is not grounded, and has continuity between adjacent poles. 

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As a further test, work around the armature with the ohmmeter on low ohms and make sure that all the adjacent segments have close to the same resistance, it'll only be a few ohms at the most.

 

The ones with the split field only have power on half the windings, the reverse is accomplished by energizing the other 1/2 the winding.  here's the wiring, the E-Unit switches between the two halves of the windings.

 

 

614 Switcher

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OGR Publishing, Inc., 1310 Eastside Centre Ct, Ste 6, Mountain Home, AR 72653
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