Everything made after 2012, the shaft should not come out, so that is likely the cause. Removable shaft models will have a blue bushing on each end of the shaft and it will reach all the way to the front cover. If the shaft seat is still good, you may be able to reseat the shaft, that is what we try first here.
Denny,
I think I have this solved, it looks like it was one pump as the older one without controller, the shaft is sanded down and the newer one the drive unit has a large ovate hole. My hunch is sand got in this pump and sanded the shaft and drive unit and then in cleaning the parts got swapped. I am still working on trying to replace the shaft, you will need a new drive unit.
ok that makes sense as i had 4 pumps all getting cleaned at the same time.
also the type of controller, bought them all in one order but one one has the new end the other 3 have the old end.
they ran for a while before the buzz started , no idea how it got the sand but there was plenty of sand in the tank.