[jhautz]

I bought a 1930/6 motor that I got new for about half price off of ebay just to try it out and see how it would do in my cen matrix conversion. Its not the high amp version so I was able to re-solder the back of the motor to configure it to a star configuration and effectively make it a 1930/10 (2090kv). The can is even marked 6 / 10. Well it took a little doing getting the solder off of the old D connection and to bridge the star connections but I got it and it ran really great for about 20 minutes or so and then everything just quit. I was out bashing and thought I fried the MM, but there was no smoke or anything else. It was just running along (and really ripping I might add, I like the motor allot) and then nothing. It just quit. No smoke, just nothing???:confused: When I got to it I pulled the lid to see if I could find what was wrong and couldn't figure it out. Everything felt cool enough. The motor was warm, but I could easily hold my hand on it as long as I wanted. I never figured it out so I just put it away and ran my revo the rest of the day.

Just now I was goofing around with the motor to try and see if I could figure out whatthe problem was and I plugged in a battery and the MM lit up and went through the start up routine with the LEDs but no sound. When it was done I could pull the throttle and the LEDs would change color just like it would normally do. So I plugged in an old 9L I had sitting around and everything worked perfectly.

So now I have it narrowed down to the motor. I plugged it into the speed control on one of my other trucks and nothing. So now I'm sure its the motor. I started looking at it thinking that I might have put to long of a screw in it and fried the windings or something, or had I a bad solder joint in one of the wires I soldered into the 3mm connectors so I could use 5.5mm connectors on the end of a short wire instead of those useless 3mm connectors. Thats when I noticed it...

All of the solder points on the back of the motor were disconnected. They looked like they had flowed clean. All 3 of the connections that I made were now clean as if I had never soldered them. I cant figure this out. There was nothing hot enough that I felt that would even come close to desoldering a connection like that, let alone 3 of them all at the same time??? I think would have done more damage than that if the motor got that hot. I admit it wasn't the neatest soldering job, but it was solid and plenty of solder was on there.

I'm wondering has anyone ever reconfigured one of the Lehner motors before? Do I need to use some kind of special high temperature solder? Is there a "trick" to it that I'm missing? I re-soldered the connections and the motor works perfectly again.

Freaky problem.... Any ideas???