Question about AO Smith Centurion 1081 2 Hp Standard Keyed Shaft Motor

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Replaced diffuser on centurion 2 HP switchless pump and it will not prime

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Check all seals and intake union and pump top seal

Posted on Jun 07, 2016

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macdirk
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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!

Posted on Oct 12, 2010

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Is it going to run on 230V then? If so you would normally use red and black. The white wire should be a neutral and the ground wire is obviously ground.

Do you have a meter you can use to confirm the voltage between the wires? If you do you'll want to start with red and white since you seem to think black was not being used before. If the voltage reads 230 and the motor is set up for 230 then attach one wire to L1 and the other to L2...it will not matter which is connected where as long as one is on each terminal. Insulate the black and ground the ground lead to the motor ground screw.

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THERE IS THE TANK GASKET THE DIFFUSER O-RING,LID O-RING AND THE SHAFT SEAL.. ITS A 1000.. ASK YOUR LOCAL POOL SUPPLY FOR A PAC-SEAL 1000 .. CLICK HERE TO SEE HOW 2 REMOVE YOUR PUMP .. PRIME THAT PUMP AFTER A REPAIR ... HOPE I WAS OF HELP.. IF SO .. VOTE .. Jay

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Pump not taking prime. I have a lot of pine leaves or nettles some of which may have got past the strainer. after it took prime it did not seem to have good flow,.


This is indictive of a clogged impeller or blown shaft seal or possibly both.
To clean out the impeller, simply removing the 8 securing bolt that hold the wet end against the seal plate and motor housing. Then remove the diffuser assembley. You should now have access to the impeller. Remove any debris from inside the impeller and impeller cage.
Reassemble , fill with water, and try to reprime.
If prime still fails, take apart again and remove impeller to replace the shaft seal.
Note:
1. Make sure the filter connected to this pump is clean and not causing the problem before following these instructions.
2. Here is the link to the exploded parts diagram for easy reference to part names. It is also good to look at previous to dissassembley so that you have a good understanding of what is where.

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Need to replace pump Impeller on A.O. Smith Century Centurion Pool & Spa Duty Switchless Pump


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!

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Make sure your pump is connected to the proper voltage. There are 2 settings High Voltage and Low Voltage. Follow diagram for your voltage. The A and B settings are for the inside motor wiring and the lines are for you wire sources.

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1 Answer

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replace diffuser oring

http://www.jandy-downloads.com/pdfs/PHP_Manual.pdf

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