Just purchad a two rail MTH SD70D mack and both motors are bad. The motors have on off the brushes broken. It is a older engine and MTH does not have replacment motors. Hase aney member had this problem?
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Check this service. Usually pretty good at odd replacements.
You may want to contact Frank Timko. He seems to have the ability to remove worm gears and re-install them on new motors. I had sent him, a few years ago, an odd ball Weaver motor, worm and mounting. He did an excellent job of installing the old worm on the new motor. He also supplied motors with worms and mountings for a set of Weaver E8's that I upgraded. 
Thanks! Even if I get it disassembled, and if I get motors, putting worm gears off and on that are shrink fitted must also be fun. I may eventually have to contact Timko or similar places to repair.
Thank for the imfo. Will ship tomaro. There a several way to install gears and bearings. You can heat in hot water or shrink shaft by frezing. On small barings even a light bulb can be used.
I am going to make a SWAG (Systematic Wild A Guess) that the motors worms in a 3 rail unit of the same model and vintage are identical. Many units made at the same time may have the same motors. it is even possible that MTH is still using the same motors, so you might find something in their parts bin that would work.
I contacted MTH and they do noty have this motor. The ones they do have that might work are a bit differentin size.
The motors are permag motors and for three rail converted from AC to DC.
A dumb question, but aren't all MTH motors DC motors where the AC is converted to DC for the DCS / sounds / lighting etc. by the control boards? For a while they used Mabuchi motors as I recall.
If you have the old motors intact, pull them out, take a picture of them, and contact Perry at The Toy Exchange in MT. Airy Md.....he has tons of MTH parts and chassis ......2 rail or 3 rail, they’re the same motors....I’ve swapped a boat load of 2 rail locos over to 3 rail, just by doing a complete truck swap....always used the motors over again in the 3 rail trucks no problems....he also has a bay sight, and sometimes those MAC chassis pop up with the motors in them.....swipe the motors, then sell off the rest of the chassis to a 3 railer....
Pat
Yes MTH William Weaver and Lionel
This is a MTH 2 rail SD70 Mack
@prrq2 posted:This is a MTH 2 rail SD70 Mack
did you test them with straight DC?
Yes both motors have one of the brushes broken.
