Pool Pump Motor (AO Smith 2HP 56Y CX) won't turn over when switched on. Makes slight humming sound. Removed the motor from pump housing. When I spin the impeller when powered on, the motor starts up

When looking at a frame size you cannot change from the "J". This letter referres to the method the pump housing will bolt onto the motor. The numbers 56 refer to the physical size of the pump, specifically the distance the center of the shaft would sit off of the surface on which it rests. You can sometimes go from a 56 frame to a 48 frame but you will need to add a spacer given the smaller physical size. Some pump bases will have a stilt that can be switched around or removed to accomodate different motor barrel sizes.

if it looks like the one pictured it has 2 caps on it both must be good, the start switch might have some trash in the points and can be cleaned with the striker off a match book, be careful not to bend point arms. search your area for your local pool pump motor repair guy..
jay the pool pump whisperer longwood florida

Hello
No there is no switch in the motor.Correct voltage is done by hooking up incoming power to a combination of internal wires or contacts.

There should be a wiring diagram on the cover where the hookup is.Or on the outside case of the motor.
The high and low speed doesnt make sence to me.Check the rpm of the motor it should be one rpm continueous.
Unless this is a Hvac motor and not a pool pump motor.Possible you may have been sold the wrong motor.
Usually a pool pump is 115 volts 1 speed and 1 rpm continuos duty.Unless you specify 230 volts.

How do I change the front and back bearings in this pool pump motor 1hp. ao smith motot I did the shaft seal last year myself but needs bearings now. thank,Bill

check for a re-set button somewhere on the motor housing.

A.O.Smith USQ1152.

I'm guessing that you replaced the motor that goes to the pump, not the pump itself. You know the motor works just fine. Is the motor rotating in the correct manner(clockwise or counterclockwise) in relation to the rotation of the pump? Have you checked the pump to see if the impeller is working/rotating? Is the motor hooked up to the pump correctly, so that the motor is turning the impeller? Are all connections to the pump tight, so there are no suction leaks? Have you primed the pump and purged it of any air locks?

take the impeller housing cover off. the shaft is threaded onto the impeller. Host the shaft and unthread the impeller.David