Motor
Warning: Be certain power to pump is off! Disconnect pump power cord from terminals in control panels
(manual pump models) and power source (automatic models) and remove pump from sump.
1.
Clean any dirt or trash from the outside of the pump before dismantling.
If the unit is being operated by float or diaphragm switch, unplug the pump from the piggyback receptacle and
plug the pump directly into the power source. If the pump starts each time it is plugged directly into the
receptacle and does not start each time when plugged into the piggyback switch with the float raised or the
diaphragm switch pressed into the start position, replace the complete piggyback switch assembly and retest
with new assembly.
2.
If motor does not run when tested as described above, the capacitor and/or stator must be checked.
Disconnect from power supply.
Remove plug from top of housing and pour oil into container, preferable clear, so that oil can be observed.
3.
If oil is clear, it will indicate motor is not burned and there has been no water leak into the motor. If oil is
cloudy, it will indicate water in motor, or, if oil is black, it will indicate a burned stator.
4.
After draining oil, carefully loosen the power cord assembly from the motor housing. With power cord loose,
remove the four wire nuts and screws and carefully lift off the motor housing exposing the capacitor (1Ø only)
and motor assembly.
5.
On single phase (1Ø) units, check capacitor using ohmmeter. With ohmmeter scale set at R x 1000, attach
meter leads to capacitor. The meter needle should go to zero and come back slowly. If it does not, the
capacitor should be replaced.
6.
To check motor stator, remove power cord leads from terminal bushings on top of motor (1Ø only; 3Ø remove
wire nuts). If stator is visibly burned, motor assembly must be replaced.
7.
Ground check
on stator should be performed using ohmmeter with scale set at R x 100 and checking meter by
putting both meter leads together and adjusting the needle know until meter reads zero. If meter cannot be
adjusted to zero, it will indicate that batteries in meter must be replaced. Always make this test with the meter
when scale pointer is set to a new scale before making any checks on the motor.
Now connect one meter lead to one terminal of stator and touch and other meter lead to motor stator shell. If
needle on ohmmeter goes completely zero, the motor probably has a wire touching the stator at some point and
the motor assembly will have to be replaced.
8.
Winding resistance test
should be performed if the ground test is satisfactory. Use ohmmeter with scale pointer
set on R x 1 scale. On this scale, meter reads directly on ohms. Always check the meter with leads together as
described above under Ground Check test before making a reading of the winding.
Connect one motor lead to the white wire terminal and the other meter lead to the black wire terminal. This
reading is for the main winding. If the readings obtained do not agree with those give below, the stator is
defective and the motor assembly must be replaced.
Reconnect the wires as they were removed.
