I replaced the motor on my Hayward Maxflo pump with a Century 1-hp. The Century works fine, but now the pump won't hold it's prime.
As soon as the pump is switched off, it starts to gurgle as the water drains, but the level in the strainer basket doesn't go down until the draining has been going on for over ten minutes. That tells me the problem is not the Strainer Cover O-Ring.
I replaced the Housing O-Ring and followed tightening rules. It seemed to go well.
I did not replace the Diffuser O-Ring. Old one looked pretty good and none at the store.
I did not replace the Shaft Seal Assembly. They sent the wrong one and I didn't want to wait.
I did not replace the Diffuser or the Impeller. Looked OK.
Just to complicate things, I also back-washed the filter, took it apart and cleaned it, then re-torqued it to almost 150 pounds.
So, where do I start?
Did I mention it's Spring in Florida?