Post moved from here. Tim5055. http://www.troublefreepool.com/threa...sing-Lid/page2
I know this thread is old but I seem to have run into the same issue opening my pool this year. My pump is a Hayward but a different one (looks similar & locks down the same way. O-ring and pump stored in a shed over the winter with o-ring always coated with plumbers silicone grease. My setup is 4 years old (5th season of use). I did deep clean my sand filter for the first time when I closed the pool last fall so I'm wondering if I've caused an issue from that. I thought I was pretty careful poking the hose down in.
I'm also seeing what I believe to be a pressure problem. When running it seems to surge rather than run smoothly. I did try backwashing and rinsing the filter with no change. Pressure reading high at 16psi (I replaced my pressure gauge last season with a high quality one). My pump housing lid leaks with pump on or off.
I happen to have another identical pump and lid from a coworker that got rid of his pool. Lids & basket looked identical. His o-ring is shot though. I didn't think to try his lid with my o-ring though. I may just pickup a new lid & o-ring even if just to keep on hand.
Any ideas on my surging pressure issue though? Did I cause an issue from the deep cleaning?