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capacitor using an ohmmeter (see
“ Troubleshooting A Capacitor” page 23).
5 .Rotate the motor shaft. If you hear a grinding
sound, disassemble the motor and check: the
conditions of bearings, a rotor rubbing the stator,
c o rrosion, a cracked frame, clogged fan or
o b s t ruction(s). Repair or replace any faulty part ( s ) .
6 .If the motor has a switch, disassemble the motor
and check the contacts for dirt. Use brown Kraft
paper to gently clean. If the motor still doesn’t
work, replace the switch.
7 .If the switch contacts are open, check the governor
for free movement on the shaft. (Incidentally, with
a Centurion motor you won’t have this problem,
because it doesn’t have a switch to malfunction.)
MOTOR STA RTS BUT SHUTS DOWN (Therm a l
Overload Pro t e c t i o n )
1 .Check the voltage at motor terminal (see #5 under
“Motor Fails To Start”). If the voltage is too high,
call power company.
2 .Check amperage. If high, find out it the pump
impeller was recently replaced (it could be sized
i n c o rrectly). Remember, motor Hp x SF = the
maximum Hp capability of motor. This number
must be equal to or greater than the pump rating.
NOISY MOTOR
Air noise is normal, but an excessively high sound
level or rough operation can mean trouble. If necessary,
separate the motor and pump to find out where the fault
lies. If it’s in the motor, check the following items:
MOTOR TROUBLESHOOTING