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It may not be you motor, but the sound of some item caught in the impellar, which is the part that causes suction. It is usually located in the upper housing, and can be accessed fairly easily. Unscrew any visible screws,(usually phillips type) and carefully lift housing off. This should expose the impellar. If debris is present, remove it.
But also check for possibly broken fins on the impellar itself. Sometimes items like coins, or nails etc, will get picked up accidentally, then spin around in the impellar housing, only to break a fin or two trying to move on. If this has happened, replace the impellar.
The Aquaflow pumps were the old workhorses and I still see some here in the USA that have been working for over 20 years. The first thing to do is see if the impeller turns freely just with your fingers. You may either take the lid of and stick a finger in the hole in the pot going toward the motor and try to spin the impeller, or on this pump you can reach the motor shaft through the holes in the motor mounting bracket. If the impeller spins freely, you most likely have a blown or open motor start capacitor. This is located under the little dome looking cap on top of the motor.
At the very worst you would need to replace the entire motor but the pump should still be OK. This pump uses a keyed shaft motor and you need a long hex wrench to loosen the 3 set screws on the shaft extension. Not the easiest pump to work on but not rocket science either. Hope this helps.
Well the only thing you haven't replaced is the water pump. The impellar can dislogde from the shaft or completely disinerate. this is not common but I have seen it. Mostly the impellar spinning on the shaft. this is one of those jobs you just have to take it apart and see. No way to check it that I know of.
There is a small plate on the side of the leg.Put motor in N and undo the plate.Inside is the gearchange linkage.It needs to be undone to drop the g/box.That's after you have undone all the other bolts:)
Make sure you put the impellar in,in the correct spin direction.The lobes facing the correct way.
Hope this helps
You can undo the bolts that are holding the motor to the pump. That will let you spin the impellar of the pump .. Please withdraw it slowly and observe how the extra pieces fall out because if you get them in wrong the pump will not work correctly, While you have it apart , try and spin the impellar and switch the motor on , seeing if it will run if you hand start it .. if it will not run , then you probably need a new motor .. Most pool shops can test the motor for you to confirm that .