I don't know if I'm the only one consistently having this problem or not. This is the second year (and third pump) that I'm having shaft seal problems with.
Fall of 2008, I bought a Hayward Max-Flow 1HP pump for our pool to replace an old Marlow pump that was past the end of it's life. I bought online from one of the pool supply companies to get it cheaper than I could at my local pool store. No problems installing it and the end of the 2008 swim season was fine.
I installed it last year after opening the pool and soon ended up with a shaft seal leak. Not wanting to be without a pump long enough to send it in for warranty service, I went online and learned how to replace the shaft seal. After less than a week, I had a new leak. I then replaced all the seals (using Jack's Magic lube to seal them up good) and within a week, I had another leak.
I talked to the local pool store and their story was that the Max-Flow was really for above ground pools and that it was under powered for my pool. We decided to stop messing with the Max-Flow and bought the Hayward Super Pump 1HP from the local store -- more to have a local place we could call if we had problems than anything else.
About a month after installing it, the shaft seal started leaking on it. The local pool company came out and swapped out the pump. The story then was that some motors were made in China and some in Mexico. The ones from China were having problems, so they made sure the new one was one of the motors made in Mexico. The rest of the 2009 season went fine.
This year, less than a week after opening the pool and getting the pump out of storage (winterized - no water, plugs removed, stored inside), the shaft seal was leaking. Pool company came out and installed new shaft seal on Friday. Yesterday I go out and it's leaking again. They open at 10AM this morning and I'm going to call them back out. They're not giving me any problems doing the warranty work, but what the heck?
Is anyone else having recurrent issues with the Hayward pump shaft seals?
As far as water chemistry goes, nothing has been far enough off that I would suspect it, but here's my numbers:
FC - 11.0 (finishing up an opening algae shock)
CC - 0.5
TC - 11.5
pH - 7.5
TA - 90
CH - 80 (vinyl pool, but raising soon for fiberglass steps)
CYA - 50 (just raised it last night from ~20 - 25)
Temp - 65