I just put a new AO Smith 1 HP motor on my (old) STA-Rite PE pump. The last one burned out in 10 months. I found that the shaft seal must have leaked, as the motor face was corroded inside and eventually started running really loud. This time I got wise and replaced all o-rings and the shaft seal.

The replaced motor was running really hot - like too hot to leave a finger on more than a second. The new motor runs quiet and is totally functional, but I noticed that it is also super hot within the first hour. Do I have a problem, and any suggestions on diagnosing?

I figure I'll bypass the filter tomorrow and see if it runs cooler - as in bypassing some blockage or the filter is making it work too hard. Another post mentioned a pressure gauge in their system, I don't think I have one aside from on the DE filter though.