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I took a break from the SAL station roofing project, because I received some parts to repair to a couple of locomotives:1) new wheelsets for the Proto2000 GP30, to fix the cracked axle gears, and2) a replacement Athearn Genesis motor for a dead Athearn FP7.About the FP7, it just up and died one day several months ago. Sound and lights worked, but no go. The 21-pin LokSound decoder functioned perfectly in another locomotive, so it had to be the motor. I could not find the exact motor that I needed, but I located an Athearn Genesis motor for an SD40/SD45. In the photos, it appeared to be the exact same motor and only the motor mount differed. But, it also looked as if the motor mount attachment screw holes were in the same location, so I could hopefully just swap motor mounts and be in business. Thankfully, this turned out to be the case. Here is the old (bottom) and new motors, comparing the motor mounts:A perfect fit back into the frame after the motor mount swap. It may not have looked like much, but the motor mount of the new motor being off by just a few millimeters would have prevented this motor from even fitting within the frame.An interesting side note. On my first attempt at installing the motor, I failed to properly seat the driveshaft in the front end. When I tested the F-unit on the programming track, it threw a fit, sputtered, and popped. I thought I had really screwed up and possibly wasted $50.00 for a new motor. Then, I noticed the driveshaft had popped out of the universal on the lead truck. Whew! That’s an easy fix. But, that’s when I found a broken power wire on the lead truck, which I wouldn’t have found otherwise, and that would have relegated the engine to six-wheel pick up. That repair required two steps backwards to replace the wire, which had actually broken about 1/2” from the end all of the way down behind the sideframe. This was not just a failed solder connection.A new wire soldered to the sideframe:A trip back to the programming track proved all was well again, so I put it all back together. This time, I struggled but got the headlight and Gyralight wires better concealed, so it didn’t appear that there was a huge black snake draped across the control stand in the cab.This is the first time that this pair has run together in many months. I’ll need to tweak the speed match after the motor is broken in, because this FP7 runs a little faster than the other unit now. No biggie and totally expected.DFF
Nice work Dave. Always good getting a "head scratcher" on the rails and running.Was the broken truck wire solid or a stranded type?
A little late now, but you could have used the WVD board we use in N scale instead of the ESU 58821 board as it's a lot smaller and still has many of the function pads.[. . .]I've used them before in small HO locomotives like RS3's, and you can just solder to the pickups where in a Kato locomotive they would just press up against them.