The Athearn Steam locos were a horrible design from Samhongsa that suffered from chronic cracked gear and u-joint syndrome, in addition to having a body shell that required distorting to the point of breaking, just to remove it. They were also out of balance (too heavy on one end) to get proper traction on the drivers, so their pulling ability was quite limited. So much for Model Railroader Magazine’s “Product of the Year” award, which turned out to be only a tip of the hat to one of their biggest advertising accounts. Athearn is out of parts and no longer offers support, and cancelled plans for a re-run to fix the many issues with these locos because they were so bad, but give them a call anyway, to see what they say, just in case. Is the motor not running due to an electrical problem or is the drive locked up mechanically? I’m sorry to say this, but I think replacing the loco with one of better quality, such as Broadway limited, is really your best option. I have several Athearn Pacific’s and Mikes that are only good for use as dummies to fill up empty stalls in the roundhouse.
Bill in FtL