Usually the starting capacitor.
Begin by opening and cleaning out the dust that inevitably collects,
reassemble and try. Sometimes its just an alternate path for electricity.
If symptoms persist, remove and replace the starting capacitor.
It's also possible that the rotating part of the centrifugal switch
has come loose from the shaft and moved away from the circuit board so
that it doesn't operate the switch. It's just held on the shaft with one set
screw. With the plug out of the wall remove the fan guard and the fan
blade from the end of the motor and inspect the cent. switch assy.
If your saw is a Grizzley,note that they stock capacitors and cent. switches.
: My 6gal/6hp compressor motor would start, then smoke would start coming
: out of the capacitor. Seems the startup circuit wasn't disengaging
: once the motor had started.
: Took the motor down to a rebuild shop - they disassembled it and found
: wasps had built their mud nest around the armature, thus holding the
: switch assembly in the closed position. A minor cleanup was all
: it needed fortunately, I never left it on long enough to damage the
: capacitor or the windings.
: Once I got it back on the compressor, a screen covering over the motor
: ends has kept them durn wasps from making my compressor motor a home.
:But the wasps wanted the luxury of a "motor home "
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