Try priming it water at the filter. Make sure that the filter o ring is sealing under the cap. Make sure there is enough water in the pool to enter the suction line and that it is not restricted.
SOURCE: REMOVE IMPELLER FROM SHAFT A O SMITH PUMP MOTOR HIFLO
The impeller is threaded onto the motor shaft, take the back cover off and use a wrench to hold the motor shaft, then turn the impeller counter clockwise to remove.
SOURCE: I have a AO Smith motor model #C48A95A06 attached
Your axpansion tank is waterloged (well extrol)
SOURCE: Need to replace pump Impeller on A.O. Smith
To get to the Impeller you need to remove a series of bolts, or a large clamp, that holds the two halves of the pump together. Once you do that, if their is a diffuser (housing that goes over the impeller), remove it. To remove the impeller, you need to lock the motor shaft. You can do this a couple different ways depending on the motor. There will either be a small cap that grants access to the motor shaft on the back of the motor, or you remove a larger housing that grants access to the wiring and other components in the back of the motor. If it's the small cap, then you can hold the shaft with a wrench. If it's the larger housing, then you can slip a wrench (probably 7/16") under the thermal overload switch and onto the shaft to lock it in place. Now you can unscrew the impeller. Check to see if the impeller has a screw in the center. If so remove this first. It will be reverse thread. The impeller should spin off counter clockwise. If the impeller is very tight, be careful not to damage it. If you don't have an impeller wrench, I strap wrench, or very large locking pliers with a rag around the impeller works well. Hope this helps. If you need further assistance post a reply in the comments, and don't hesitate to leave a good thumb rating if you found this helpful. Thanks, and good Luck!
SOURCE: how to remove motor AO Smith Model C48K2N143CIC
Take off the rear cover as to expose the capacitor. Remove capacitor. Place a 7/16 wrench on the shaft threw the opening where you removed the capacitor. Put a rag on the impeller and with a wrench turn it counterclockwise. It should come off easily. Make sure you replace the seals before reassembling
SOURCE: Want to replace my AO Smith Mod C48K2PA105C5 pool
i recommend the sta rite dura glass . it's the best pump out there! you will need to plumb it in . but it's worth it ... it's the only pump i sell .. remember to prime the pump after any pump repair + never starve the pump for water . find a used pump from your local pool pump motor repair guy and ask him how 2 take better care of your pump.. he can save you thousands of dollhair$ over the years .. jay pump guy longwood Florida
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