A.O. Smith Century Pool & Spa Motor - Manual (Page 23)

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1 .Mounting, motor coupling and brackets. Tighten
loose nuts, bolts or set scre w s .
2 . If a noticeable drag is present, check the bearings
and bearing load spring.
3 .Make sure motor fan moves freely and rotor isn’t
rubbing stator. Look for loose or binding parts
inside the motor or pump.
4 .Check for malfunctioning motor start switch and
g o v e rn o r.
If the problem appears to be with the pump, look for a
loose motor coupling, loose or damaged pump impeller,
clogged pump filter or strainer, or cavitation (loss of
prime or air leaks on the pump’s suction side).
MOTOR HOT, SMOKING OR CYCLING
1 .Check the motor’s ventilation by looking for
clogged air vents or openings. Clean out all leaves,
d i rt and other pool and spa gunk.
2 .C o m p a re connections and wiring to diagrams.
Test the motor voltage to verify that it’s within
±10% of nameplate listing.
3 .If the voltage checks out but amps are higher than
the maximum on the nameplate, inspect motor and
pump for mechanical obstructions, but not before
TURNING OFF THE POWER.
4 . E n s u re that the motor’s horsepower (Hp), times the
s e rvice factor (SF), is equal to or greater than the
pump rating (Hp x SF
≤
to Pump Rating). A
full-load current greater than the nameplate listing
can mean excessive pump load.
5 .Look at motor windings for damage or signs of
s h o rting. Measure winding re s i s t a n c e .