If you decide to replace the well pump yourself, here are some tips to remember. Determine that the pump motor is bad by checking circuit breakers, switches and check that power is at the well head. If power is on at well head it is a good sign that the pump is broke. Turn off the power at the breaker panel, tag and lock it out for safety before you start exposing the well head. Clear the area around the well head, approx 6′ to 8′ diameter, of shrubs and plants so you have enough room to expose the pump outlet and electrical connections. Disconnect the discharge pipe and undo the wiring at the junction box near the top of the well. Loosen the bolts on top of the casing cover, this is a squeeze type of cover with a thick rubber ring that expands as tightened and contracts as loosened against the casing interior. Once loose, try to lift the cover, as you lift you will be getting an idea of how heavy the whole assembly is of which you have to lift out of the well.
Now you are ready to lift the pump. Rubber gloves, protective clothing or coveralls should be worn as the pump piping may have an iron and silt residue on the exterior and can be quite a messy job. Fasten a pull rope around the top of the well head for the other person to hold on and tie off if needed. Some wells may have a leader rope or cable already attached from original installation instead of relying on the discharge hose clamps and connection. The person who will do the actual pulling should stand directly above the well to lift the discharge piping straight out of the casing and the other person should stay with the top end of well cap and guide it to where you lay it down as you pull. Make sure that the person guiding the end has a good grip on the end before you release to get another grip. Continue until pump assembly is fully out of the casing and wash off the entire pump end so you read the specification tag of the pump.
Most submersible pump are two piece units bolted together to be one assembly and consists of the motor and the pump. You can just replace the motor or pump if you choose, but I would highly suggest that you replace the whole assembly. After you have identified what type and size pump you have you may want to decide to upgrade your system with a higher volume pump of keep the same configuration. For upgrading, you should contact a supplier or well contractor for recommendations to be compatible with your needs and piping sizes to which your pump feeds.
Installing the new pump assembly. Make an itemized list of new parts, controls, fittings or wiring as needed. If the existing wiring and flex pipe are in good condition there is no need to replace them. To install the new pump you will have to splice the electric wires together in a waterproof connection. Consult an electrician or well contractor to specify the power wire splice connector type and technique acceptable for well applications. Connect the pipe fittings and pipe clamps as directed in the manufacturer’s instructions. Tape the power wires about every 2′ for the entire length to the flex pipe for ease in reinstallation of pump into casing. Turn the power to the pump on momentarily to check if it is working before inserting assembly into well. Turn the power breaker off and prepare to insert the pump back into the well again using 2 people – one at the well opening lowering and feeding the pump down and the other person at the well head cover feeding the slack to you and to help hold back to prevent the pump from dropping quickly down the casing.