Recently my Delta 50-763 dust collector stopped working. When I turned on the power all I’d hear was a loud humming noise but no motor revolutions. After doing some research and speaking with the folks at Delta we determined it was a bad motor starting capacitor.
If you’d like to learn more about how to replace it please check out an article I wrote on my own site.
-- Todd, the Tool Man - http://www.toolboxbuzz.com