Screw on type rusted
If the impeller is fused onto the shaft by rust or mineral build up the chance you will be able to remove it with out destroying it are slim. You're likely going to need a new impeller and shaft seal kit, so I'd suggest getting them before your try to remove the old impeller.
First you must remove the water/plumbing and the strainer basket assembly or pump faceplate if applicable to gain access to the impeller.
Step two, on the backside of the motor (opposite side of impeller) you will find the back end of the motor shaft. This end of the motor shaft has a slot in it so that you can insert a large flat screw driver. This will help you to hold the shaft while you try and unscrew the impeller. fyi your pump might have a plastic housing on the back of the motor which you should remove to get to the back of the shaft. This is best way to remove the impeller but its likely to be a struggle if there is rust on the shaft. Good Luck
SOURCE: removing pool pump impellor
Separate pump and motor. Remove diffuser. Remove back cover from motor. Motor shaft has either a slot for a screwdriver or a flat area for a wrench. Hold shaft and unscrew impeller.
SOURCE: where to find replacement parts for AO smith pool pump motors
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SOURCE: Pump seal is leaking water. I removed the screws
This is from one of my previous posts, may be some extra steps, but should cover what you need... Turn off the electric first. Now split the pump in two by removing the large clamp or 4-6 bolts holding the two halves together. (not the 4 bolts holding the motor to seal plate, but the the bolts holding the seal plate to the seal plate housing). Once you remove the clamp or bolts, the motor with seal plate, diffuser, and Impeller can all be pulled back away from the pump. Then disconnect the electrical from the motor and you can pull the motor with the seal plate, and impeller all the way out and work on it. To get to the impeller, you need to remove the diffuser (plastic housing that goes around the impeller) usually by a series of 3 to 6 small screws. To remove the impeller you need to lock the motor and unscrew impeller. Depending on the motor, you remove a cap in the middle of the tail piece and hold with a wrench, or remove a cap that covers the whole end and grab the shaft with a wrench (usually 7/16") by sliding it under the thermal overload switch, or removing the capacitor for even easier access. Once you've locked the shaft, you can just unscrew impeller. If the impeller has a bolt or screw in the middle remove that first. this screw will be reverse thread so make sure you don't turn the wrong way and break or strip. If there is no screw, or after you've removed it, just spin the impeller off (standard thread). If you can't do it by hand and assuming you don't have an impeller wrench, be very careful and use a large pliers, pipe wrench, or strap wrench to loosen it. After that you unbolt the motor from the seal plate, pull the seal plate away from motor (this removes half the seal), and then pop the other half of the seal from the seal plate. Make sure to replace the shaft seal, and use a tiny bit of pool lube on the rubber parts when installing, but keep the white ceramic, and black graphite surfaces 100% free of any dirt, grease, etc while working with them. Installation is pretty much just the reverse. Install half the seal into the seal plate. Install the seal plate onto motor and bolt into place. Install other half of seal onto shaft. Screw impeller onto shaft and install screw (if one was there to start with) in center of impeller (reverse thread). install diffuser over impeller make sure it is centered and doesn't rub the impeller hub. Install new diffuser and valute o-rings. Hookup wiring before re-attaching to rest of pump. Clamp or bolt back together. Pour plenty of water into pot to prime and flip the motor on for a sec or two. Pour some more water. Install pot lid. You should be good to go. Keep in mind there are many different pumps and some variations to the above instructions, but the above should cover most situations. 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!
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