I am trying to disassemble the impeller from my century centurion pool pump. How do I lock the shaft so that I can unscrew the diffuser? Thank youl.

Take the Diffuser off and run it if the impeller turns then might be tightening the Diffuser too much, it just needs to not move, doesnt really need a super waterproof seal or anything like that. If it still doesnt turn with the Diffuser off it might have locked up when replacing the Impeller, you can try to turn the impeller manually or remove the cover plate on the back of the moter and turn the shaft manually back there. OOoorr you broke it

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!

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!

Remove diffuser. Remove rear cover from motor. Hold shaft with either a screwdriver if shaft is slotted or 1/2" wrench if there is a flat on it. Unscrew diffuser. If there is a screw in center of impeller unscrew it first.(reverse thread)

First, separate wet end of pump from motor.If not already off, take diffuser off. Remove back cover of motor and hold center shaft with either a wrench on the flats of the shaft or a large screwdriver on the end of the shaft.(It all depends on which motor you have.) Then just unscrew impeller. (Some larger hp motors have a reverse threaded screw holding impeller also.) You may need a large pair of pliers but be careful not to score the impeller.

First remove bolts holding motor to wet end. Pull motor back and out of wet end. Diffuser should just fall off. Not held by anything, there are just some locating tabs. Next, unscrew impeller. Some impellers may have a screw holding it on to center shaft. If so, unscrew.(Backwards thread). Remove back cover on motor and hold centershaft with large screwdriver or wrench on flat of shaft. Unscrew impeller. Next, unscrew 4 bolts holding motor to seal plate.

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.

Super pumps are very easy. If it is a northstar it is more difficult. Super pump. You will need 1 motor, 1 pump seal, 1 diffuser gasket, 1 housing gasket. turn off breaker, disconnect wires -noting whether it is 110 or 220 volts- , unscrew four bolts on back of pump housing (shaft side of motor), pull out motor with rear housing and diffuser (sometimes diffuser sticks inside), on wire side of motor hold shaft with wrench (flathead in some cases, but it is harder), unscrew impeller counter clockwise (like normal screw - you will nee a big pair of channel locks or a strap wrench), there are two pieces of the back housing and once the impailer is off you can remove the half that is closest to the end of the shaft to reveal four more screws, unscrew those four screws. screw back part of rear housing onto new motor. Install new pump seal to front part of rear housing and impeller, slide on front part of rear housing and then screw on impeller while holding shaft on wire side with wrench (only hand tight), replace housing gasket, replace diffuser gasket, slide into front housing and screw in four bolts. If electrical was 110 you will need to move the jumper on the wire end..if it was 220 then just hook kup wires...doesnt matter which is which as long as green or bare goes to the ground screw.