Pool Info: Pumps & Motors - Page 3
Pumps & Motors (cont.)
How to INSTALL an entire new pump
Plumbing in a new pump motor...
Cut the pipes going into the front of the existing (old) pump, and the pipe coming out of the top. Important: Choose your cut location so as to allow room on either side of the cut to glue on a repair coupling. Remove the wires and the conduit adapter from the rear of the motor. Remove the MTA fittings threaded into the front and top of the old pump. Using Teflon tape and perhaps also silicone sealant, thread in the fittings you removed from the old pump. Note: Do Not Over-tighten, turn only 1 1/2 turns past hand tight. Using rubber mission couplings, PVC unions or simple slip x slip couplings, reconnect the pipe you cut. On PVC fittings, use a good primer and good, fresh PVC glue for pressure applications.
Wiring up a new pump motor...
First, screw in the conduit adapter onto the back of the motor. This adapter is usually removed from the old pump and screwed into the 3/4" threaded hole where the wires enter the back of the motor. Some motors offer an additional port of entry on the top for wiring flexibility. Remove the back of the motor and run the wires in through the adapter, and tighten down the threaded connector to secure the wires and keep out moisture and insects. Notice where the wires enter the back of the motor, on the right side, a terminal board that has 2 brass screws for clamping down the 2 wires (lines) coming in. It doesn't matter which wire goes to which screw. Above the terminal board, there is a green screw that is for clamping down the ground wire.
Replacing the motor (not the plastic wet end, just the motor)
Having learned how to remove and break down a pump and motor in the previous sections, replacing any of the components is simply a matter of disassembling the pump down to the component that needs replacement, getting a replacement part, and reassembling the unit. Of course, if the entire pump and motor is to be replaced, you purchase the replacement as a unit and plumb it in as previously described.
Sometimes the motor will trip the circuit breaker when you try to start it. If this happens it is usually because there is something wrong with the motor; however, it could be a bad breaker or one that is simply undersized for the job and has finally worn out. To replace the motor here is the procedure:
I always try to stress to pool owners that a lot of air in the pump or loss of prime problems are due to lack of lubrication on the pump lid o-ring. Lubricants like Magic Lube (Teflon based) or Jack's Lube are always a great choice. Remember that a little dab will do the job. Never use a petroleum based product (i.e. Vaseline) for lubrication on o-rings. Inspect the pump o-ring for cracks, splits, or pinch marks. Finding little problems can prevent big problems from occurring.
All pumps have seals to prevent water from leaking out along the motor shaft. When these wear out due to overheating, vibration or a sudden change in water pressure - you will need to replace your pump shaft seal. The first thing to do is to turn off the electricity to the motor at the breaker.