I am hoping someone can advise me on this. I am stumped. Anyway, here is the story.
My DC grinder went caput on me. Prior to that, it had stopped working 3 times on me, but would restart a few seconds later. This all happened in a span of about 5 minutes and the grinder wasn't even running long enough to get warm.
So I checked all my connections and replaced the fuses in the controller. Nothing. I checked the power coming into the unit. Good. Being curious, I used a test light (fusible link) to crossover power to the motor. It powered the motor, but only at a constant speed. Now, the reason I am stumped is because I did this on the output side of the controller. I first assumed a ground problem, but why would it not work in variable speed? Not sure why now, but I thought the problem may have been in the rheostat, so I replaced it. No dice. Well, I am conviced that the controller is the culprit, but want to make sure first. Any ideas?

TIA,
Brett

Brett, this is just a shot in the dark, but have you tried tweaking the pots (torque, etc.)?

Brett, What kind of controller? Post the manufacturer, type serial...etc. Maybe a reader will reconize it..and the problem.

Here is a link to a repair company that I've used. I think they charged about $75..regardless of the repair needed and it took about a week. They give a warranty as well.

www.qie.com/ (http://www.qie.com/)

I was very pleased with the service and it sure beat the heck out of buying a new controller.

Good luck,
Rob

Don,

I adjusted the pots to no avail and set them back where my manual recommended. Forgot to mention that.

Rob,

Thanks for the link. I will check with them after I hear back from Leeson. The controller is a Leeson Speedmaster, model # 174307.00.

Thanks,
Brett

I suggest sending it in to be repaired, too. Playing around with it yourself could cost you a lot more in the long run.