07-29-2013, 09:31 AM
Agree, sounds like a recap is needed. When transformers heat up a lot, sometimes the tar comes out and the the winding pack vibrates freely. If there is not a short in the windings, you can take the bells off, and repack. I've used Elmers followed with electrical tape on the outside of the winding pack to firm things up a bit more against the bells. Make sure all screws are tight as well.