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Hi everyone trainfam here,

For the past two weeks I’ve been working on different motors that I had in my collection waiting to be repaired. That being said I came across a Marx prewar motor that goes with the early Marx CV and Mercury’s. The motor was very dirty and obviously needed cleaning. That being said I went ahead and cleaned off the motor and e-unit. Both of the pieces are now clean and ready for operation. I then carefully put back together the motor and tested it. The motor ran well but then stopped. So I took the motor off the track, tinkered with it, and put it back on the track. But it did the same thing as before, it ran then stopped dead. My first thought as to why this was occurring was because of the e-unit switch dropping power. I then re-disassembled the motor and thoroughly cleaned the e-unit, this time actually taking apart the e-unit. I put back together the motor, minus the wheels, but nothing changed. I then thought the commutator was to blame and switched it out for another, but to no avail. At this point I’m at a loss as to what the issue is. Does anyone have an idea what’s wrong?



                                             Trainfam

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Post your resistance values against the the following expected values (disassembled, isolated, and off the track):

  • E-Unit Coil: ~11 ohms
  • Field Winding: ~.4 - .5 ohms
  • Commutator Winding A to B: ~1 ohms
  • Commutator Winding A to C: ~1 ohms
  • Commutator Winding B to C: ~1 ohms
  • Armature Axle to Commutator Pole A: 0 ohms
  • Armature Axle to Commutator Pole B: 0 ohms
  • Armature Axle to Commutator Pole C: 0 ohms

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