My pool is only a couple months old and the pump has off and on made some abnormal noises. This is a 1hp Sta-Rite pushing through a sand filter in a 14000 gal. Pool. When we first started up, I noticed a loud vibrating noise around the shroud(right behind the clear-lid skimmer) that I was able to stop by turning the pump off, then back on again. It did this maybe 2 or 3 times the first week. I was thinking air being primed out. Now just in the last couple days, the noise has come back and I couldn't get it to go away at all. I disassembled the shroud and checked to make sure the impeller was clean and I reassembled the shroud and skimmer to the motor making sure all the bolts were tight(they were actually not very tight before I did this). There is also a plastic piece(a wear ring) that sits between the shroud and the actual impeller so I was thinking that maybe this dude was what was rattleing and making the awful noise. Now today the pump is running quiet again(so far) except that I hear a click or shift sound around the shroud area about every 30 sec.s or so. Its almost like a clutch keeps engaging or the pump is trying to "catch up" with itself(does that make any sense ) This thing is pumping the water fine and I don't see any air bubbles. Any ideas on what is going on with this thing? It is under warranty and can be replaced but not till next week. I thought bearing going bad but wouldn't that mean that it would be loud all the time and not intermittently?