STUCK IMPELLER???

[akajun]

Make up a split plate to go behind the impeller that has a hole in the middle to suit the shaft diameter. Bolt the split plate together and then attach your puller setup to that plate so your pulling against the centre of the impeller. Put tension on it, soak with your favourite penetrant, more tension and give your puller a few firm taps on the jacking bolt. Depending on the size you might be able to do this in a hydraulic press. I doubt you'll get enough temp difference in the places it really matters to get it apart. Pressure, penetrant and shock usually works.

I like this idea, I’d take it a bit further
If you can unscrew the impeller and get it down the shaft away from the stuck end do that
Then make up the split collar like mentioned before and also a piece of plate to make a shield
Make them out of aluminum to act as a heat sink and put wrench flats or scanner wrench holes on it. Clamp it around the shaft with barrel rosin or sandpaper

You should now be able to heat the shaft somewhat without hurting the impeller or shaft

 

[whatsupdoc]

This Thread is pointless without PHOTOS

 

[hogpatrol]

What rotation does the pump go, clockwise or counterclockwise? May have been posted but it may have threads opposite of the direction you're trying to unscrew it.. Try going the other way.

 

[Ksracer]

Threaded shaft.

Threaded impellers are removed with knocker wrenches, which are nothing more than solid bars that fit over the input shaft and key. Remove the coupling, strap the power frame down solid to the work bench, install knocker wrench, and fling it in the direction of rotation as fast as you can. Situate something solid for the end of the knocker wrench to stop against. The impellers inertia combined with the sudden stop is what breaks it free. The faster you can fling it and the more solid the stop the better. I've seen people rig up rip cords around the shaft for added speed.

 

[tikkaman308]

Threaded impellers are removed with knocker wrenches, which are nothing more than solid bars that fit over the input shaft and key. Remove the coupling, strap the power frame down solid to the work bench, install knocker wrench, and fling it in the direction of rotation as fast as you can. Situate something solid for the end of the knocker wrench to stop against. The impellers inertia combined with the sudden stop is what breaks it free. The faster you can fling it and the more solid the stop the better. I've seen people rig up rip cords around the shaft for added speed.


This is exactly how you do it. Been an industrial pump mechanic for 20 yrs. Working on drinking water, waste water and power generation pumps.

 

[cmysix]

I GOT IT! Thank you all for the suggestions. I investigated Liquid nitrogen and all other possibility's, Finally I just took a 3/4 inch round "bar with one end turned down to about a 1/2 inch with the very end "domed" got it in a slot opening in the impeller, tapped it in slightly put the pipe on it and pulled against the J wrench and POP! after unscrewing it and disassembling the entire assembly, it was completly devoid of any never seize or anything. No apparent damage to the latex encased impeller.

 

[Stumpy1]

I just love a happy ending

Frank