Looking at the face of the pump, the impeller unscrews by turning it counterclockwise. Also, for some strange reason, the 4HP pump gets a 3HP impeller; the rating is embossed, in very small letters, near the center of the impeller. The 3HP impeller part number is: 310-4200.
Be sure to change the seal: US Seal P/n: PS-1000.
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When you open the pump up look to see if you have a set screw in the center of the impeller. This is a left hand screw, start by removing it. Remove the diffuser from the front of the impeller. Quite often you can just take a screwdriver and wedge it into the left side of the impeller and hit it a good shot with a hammer straight down to break the impeller free. Then just screw it off.
If that dosn't work then you have to open the back of the motor and get to the end of the motor shaft. The end will be squared off so you can get a wrench on it. Then take a big pair of water pump pliers and get the front impeller and unscrew it.
The metal in the impeller and the steel shaft will stick to each other so you will have to break it free. At that point the seal plate will come off.
When your done and putting it back together be sure to replace the seal and all the "O" rings.
If the shaft seal has been leaking the impeller stem may have split due to corrosion. This makes it very hard to un thread the impeller. After removing the face plate, try sliding a screwdriver into the front of the motor thru the vents. You should be able to seize the armature from turning by doing this. Then use a large channel lock wrench and try and un screw the impeller CCW. If this doesn't work you have to break the impeller off. See my previous post.
When you go to loosten the lock ring you will need to find the lock tab that will keep it from comming off. This tab I think will pull out but it may push in and this will free the ring to turn. Once this is off if the motor runs turn it on for a second and let it push the front and back half apart. If it won't run you can use a flush bag to pressure it off. In worst case you can pry the halvs apart with a big screwdriver. If you do this be careful not to hurt the case of the pump it is just plastic.
When the pump is opener you remove the difusser and look inside the impeller. If you have a screw in the center of the impeller it will be a left hand thread so to remove you will turn it clockwise. Now just unscrew the impeller turning it counter clockwise and take the rear plate off the motor by removing the four bolts on the back. Good luck.
The impeller is screwed on to the motor shaft; to remove it you need to hold the motor shaft at the fan end so that you can unscrew the impeller - normal right hand thread. Holding the shaft can sometimes be quite difficult so a good suggestion would be to remove the fan cowl along with the fan, this will enable you to secure the shaft with a small pipe wrench or similar. Once you have the impeller removed it will be possible to ascertain what steps need to be taken next - you may need a new shaft sleeve as well as a new mechanical seal assembly.
The impeller is threaded onto the end of the motor shaft and the housing (pump body) is attached to the motor with the same bolts that hold the rear cover on the motor they run all the way through on most pumps.
Are you holding the motor using the 'flats' on the shaft on the back side?
I have removed lots of impellers - usually I find the center has spun out of the impeller so I use channel locks to remove the hub. All the pumps I take care of are standard thread - might yours be 'backward'?
Try this, get a leather belt and wrap it around the impeller. About a foot from the end, put a stick under the belt. Hold the stick and belt together and try to lever it off that way.
The impeller screws on the motor shaft. First replace the through bolts in the motor. These are the long bolts, they will just cause headachs. On the back of the motor their will be a place to hold the shaft from turning, If you hold the shaft the impeller just unscrews. If you look in the center of the impeller it may have a set screw holding it to the shaft. If you have one of these it will be a left hand screw. Then you will need to break the impeller free as the brass that holds the impeller on will stick to the stainless steel of the shaft. Don't let how tight this is fool you when you put this back together it just goes on hand tight. Good luck
First remove seal plate and mounting plate on motor. The front end bell of the motor is alunimun and is probally corroded, you will need to scrape most of this corrosition off the front of motor and then wire brush this clean. A coat of paint will not hurt at this point or coat or coat in a good pool lubricant to stop corrosion in the future. This calcium will build to the point of warpin seal plate and tweaking impeller shaft and it will quite often crack the seal also. As far as reassembly hand tighten only. If the pump has the motor it came with you have to shut the power off at the breaker and carefully use a 3/8 open end wrench to hold the back of the motir shaft. If the motor has been replaced you will need to check with the manifctuer.
On the big lock ring there is a small clip that you pull out away from the ring then turn out of the way. It is just a peg to stop the ring from turning, with that done from the back of the pump loosten the ring in a counter clockwise direction. With the ring clear start the pump for just a second a couple of times till the water pressure pops the pump in two. Once that is done I beleve it has five screws holding the difuser on, pull that and on most models their is a center screw on the impeller. This screw is a left hand thread so turn it clockwise to loosten it. Then insert something flat and strong in a vain of the impeller on the left side and give it a sharp hit to start the impeller spinning off. If need be spin the rest of the way off and your at the seal. Rember when putting this back together Hand tight only on the impeller and use a teflon or silicone base lube not petroleium jelly.