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How do you replace an ao smith ust 1152 pump?

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1. Shut the power off.
2. Disassemble the pump case by unscrewing the
bolts holding it.
3. Take the impeller (rotating element) off the shaft,
as well as the impeller cover (difuser) if there's
any.
4. Take off the mechanical seal taking care of the
ceramic seat, and the carbon ring. Should this
break, you have to replace it. Just leave the
ceramic seat in place.
5. Now, you can take the motor off from the pump
housing.
6. Now, you can mount the replacement A.O. Smith
electric motor to pump housing.
7. Remount the mechanical seal, the same position
when you take it off.
8. Then, remount the impeller, the difuser, and the
pump case cover. Take care of the O-ring serving
as gasket.
9. Once you reassembled the unit, reinstall it, prime
it up.
10. Put the power on, and start the pump. Okey.


Posted on Oct 31, 2009

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I have a A O Smith SN 1152 pool pump. The motor just hums when the switch is turned on. The pump is eight years old and I have had no problems until now.


Remove the 4 fasteners that hold the pump head onto the motor and try to turn the motor shaft by hand. If it turns freely, apply power and see what happens. If it turns Ok, then your problem is the pump head not the motor. If the motor does not turn by hand then it needs to be replaced. If it turns by hand but not when power is applied, you may get away with replacing the bearing in it.

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Need to replace back half of a.o smith pool motoer


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