Troubleshoot a Deep Well Jet Pump
Deep well jet pumps move the water in well systems that extend some distance below the surface. Jet pumps use principles from both centrifugal pumps and injector systems to move water over the distances required. Deep well jet pumps require regular maintenance and troubleshooting to operate effectively and stay in working condition. Priming the pump successfully and changing out any broken impellers or seals protects the pump and eliminates many common problems.
Instructions
1. Shut off power to the deep well jet pump. Take out the small priming plug inserted into the top hole of the pump. Place a running water hose at the hole and fill the deep well jet pump's casing with water. Shut off the water hose when the casing is full, and put the priming plug back into the hole without tightening it.
2. Run the deep well jet pump until air stops bubbling up from under the priming plug. Remove the priming plug, and fill the casing again with water. Repeat until no air remains in the casing, and water leaks from the plug instead of air bubbles. Ensuring all air exits the casing in this way prevents vapor locking and eliminates problems stemming from air caught in the casing or lines.
3. Switch the deep well pump off, and remove the long bolts holding the wet side and motor side of the pump together. Lock the wrench onto the motor shaft behind the impeller, and prevent it from rotating. Turn the impeller counter-clockwise along the threads until it comes off the shaft. Move the ceramic mechanical seal at the end of the shaft along the shaft until it is free.
4. Set a new ceramic mechanical seal on the shaft, and slide it to the back of the shaft. Replacing the mechanical seal of the pump stops water from leaking into the dry end of the pump. Lock the wrench on the shaft once more, and twist the impeller on the shaft until it rests next to the seal. Use a new impeller if the old has cracks, wear or other damage. Replacing the impeller lessons vibrations and noise caused by the motor and prevents other pump components from suffering damage caused by the impeller grinding against the pump sides.
5. Place the deep well pump's wet and dry ends next to each other with the bolt holes lining up. Insert a bolt into each hole, and tighten them with a wrench to secure the pump.
Tips Warnings
Check the impeller and seal of the jet pump monthly, and replace any damaged parts to prolong the life of the pump.
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