Question about Drills
It only hums when turned on
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Posted on Jan 02, 2017
Look instead at the motor and drill post bearings. Remove the belt to see if the motor runs correctly with no load. If it still hums and gets hot, check that the motor itself turns freely (when off). If the motor seems to be ok, turn the driven pulley by hand--it should also turn freely. The capacitor is usually a starting assist, not running. To test, wrap a small rope several turns (when pulled must turn in the normal direction) around the small motor pulley and pull smartly while turning the motor on. If it now comes up to speed, the capacitor has lost capacitance. Electronic parts suppliers like Jameco or Mouser have such items.
Posted on Aug 23, 2009
The motor has either got worn brushes or more likely the windings have been attacked by moisture and gotten the dreaded "green spot" (corrosion).
Worn brushes can be replaced if the commutator is still good. But failed motor windings require a new or reconditioned electric motor.
Posted on Mar 12, 2010
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