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.
Make sure the motor is wired correctly, especially the 2 field windings. Insure the field winding soldered to the lug that gets screwed to the motor has the insulator in position so as not to ground that field winding permanently.
Larry
If the wiring checks out, the brushplate could be worn causing the armature to tilt to one side and cause the binding. Check the lower end also.
Bill
Insure the field winding soldered to the lug that gets screwed to the motor has the insulator in position so as not to ground that field winding permanently.
This is almost always the problem with these motors. Everything looks perfect except that little insulator has been lost.
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