1 HP electric motor hums but not turning.

It is likely the motor start capacitor has failed, especially if it gets going when the motor is turned manually.

DIRTY START switch or the motor is locked up, breaker off ! remove motor from tank body and see if the motor will turn over if it does could be the switch or the motor is shorted witch there is no fix but a new or rebuilt motor. search your area for your local pool pump motor repair guy with free testing..
Jay the pool pump motor repair guy longwood Fl

could have a bad run capacitor or a start capacitor . search your area for your local pool pump motor repair guy with free testing, 9 years old that motor needs to be rebuilt.. i charge 85.00 to rebuild a 2hpincludes a free shaft seal.. remember to prime the pump with water after a repair !! best of luck .. oh breakers become week after amount of time time .. and ask the repair guy if this is the right size pump for you pool.. 9 out of 10 times its way too big !.. jay longwood florida

Your motor is covered under a 1 year manufacturers warranty. The issue you describe can be one of a couple problems all of which will lead to permanent motor failure if not corrected. I'd suggest you go back to the place of purchase or contact AOSmith for a warranty center near you.

You can find the warranty center online at:
http://www.aosmithmotors.com/AOSECatalog/ServiceshopLocator/ServiceShopLocator.aspx

John

bad centrifugal switch or capacitor

SOUNDS LIKE A DIRTY START SWITCH OR CAPICITOR. THES MOTORS ARE NO JOKE AS I'M SURE YOU ARE STILL FEELING THE PAIN OF THE PURCHASE PRICE.. LOOK FOR YOUR LOCAL POOL PUMP REPAIR GUY WITH FREE TESTING ,USE YOU ZIP CODE ..
I WOULD HAVE THIS TYPE OF MOTOR SERVICED EVRY YEAR ! 1ST TIME ABOUT 80$ NEXT YEAR 40$ WHAT I CHARGE..
DON'T TAKE THE CHANCE HAVE A PRO LOOK AT IT, THERE TOO EASY TO SCREW UP .$$$... IF YOU UN-HOOK THE WIRES TAKE PICTURES OR WRITE DOWN WERE EACH ONE GOES !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!BEST OF LUCK..
HOPE I WAS OF SOME HELP, VOTE IF'N I WAS

if its whining but still spinning, the bearings are done. If it just makes a loud noise, the capacitor could be bad or the bearings have seized.

you need to lube the motors shaft with electric motor oil they sell it in any hoby shop

It sounds like the impellor is locked. Take this part off and then see if the pump is turning but before you do, some of them have a big screw driver slot in the shaft. If it does, turn it to see if you can free the impellor. I have done this many times and they will continue to work for years after. They just get stuck from rust, etc. and also being frozen a little. Hope this helps.

Sounds like it just needs lubricating. It's probably dry seals rubbing against the stainless shaft.

Bad bearings usually make grinding noises. Replacing bearings can be a DIY job, but not a teriffically simple one.