Home Improvement Questions? Ask a Handyman for Answers
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Thanks for the thorough explanation of your symptoms. With everything you have done the humming is most likely being caused by stripped or binding gears inside the motor unit or you need a new start capacitor. I would unplug the unit, take the cover off and inspect inside. See if the gears are in good shape and hopefully not plastic shavings everywhere. Inspect the capacitor; it is a cylinder shape and if it is bad, you will often see the sides bulging or it could be leaking fluid.If you are satisfied with this answer please leave me a positive rating at your convenience.
There are plastic shavings and the large gear wheel is worn some... but it still seems to have sufficient teeth to mesh with the main turning gear...
Do you think I could find replacement gears for this unit (manufacture date of 1995)???.. and would replacing gears (if available) be cheaper than a new unit???..
The capacitor looks fine... clean... no bulge... nothing leaking...