Spectra Watermakers Ventura 150T MPC, Installation And Operating Manual

Page: 57 / 86

57
SHURFLO PUMP WON’T RUN
If the pump has power to it but the pump won’t run, first check the pressure switch. The pres-
sure switch (EL-FP-PS) is located on the wet end of the pump and has two red wires plugged
into it (see photo, next page). Jump the two red wires together and see if the pump runs. You
can safely run the system with the pressure switch jumped, just keep an eye on the feed pres-
sure and don’t let system pressure exceed 110 PSI. Replace the switch when a spare is availa-
ble. The pressure switch should never open unless there is a problem with the system or it is
incorrectly adjusted. See Adjust Shurflo Pressure Switch on next page.
If the pump will not run with the pressure switch jumped then it is most likely a problem with
the brushes or overheat protection switch inside the motor. The motor will come completely
apart by removing the two screws on the end of the motor. Remove the rear cover and paper
insulator. Pull out the plastic brush holder. The thermal switch is located on one of the brush
leads. With an ohmmeter, check for continuity through the switch. If it is open, you can make
temporary repairs by wiring around it, being careful that your new wiring doesn’t chafe on the
moving parts, nor resist the springs that push the brushes on to the commutator. The overheat
switch is unlikely to fail unless the motor has overheated. Consider relocating the pump or im-
proving ventilation if the overheat protection has failed.
If any corrosion is apparent the brushes may be sticking. Once apart clean all the carbon dust
from all the parts. Clean the commutator with light sandpaper. Make sure to clean the small
grooves on the commutator with a small sharp tool to remove the carbon in between the seg-
ments. Adjust the springs on the brush holders so the brushes slide smoothly in and out. If the
bearings are rough and binding, remove the rubber dust cover to clean them, grease them,
and work them free by hand. Don't service the bearing unless absolutely necessary. Reassem-
ble in reverse order. You can hold the carbon brushes back with papers clips inserted through
the slots in the brush holder so they don't hang up on the bearing during assembly. Make sure
the corrugated bearing shim doesn't push out. If it does, push it back into place.