Pump Motor runs HOT - problem?

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.

They normally run hot. Mine is normally around 150F. Not hot enough to burn, but too hot to hold on.

That is reassuring, thanks! I had a more knowledgeable friend check the voltage on my leads, both are 115 and the motor is set for 230 - so I guess it's wired correctly.

My father's retired electrician friend suggested that the wire gauge should be thicker for the distance from breaker panel - suggested 10 gauge. I am not sure what mine is, but I believe it's 12 (thinner than 10).

I read in another online post that pump motors have an internal thermo sensing shutoff that prevents it from overheating, and that intermittent stop/start symptoms would indicate that switch being tripped. Mine runs continuously, so I think I'll just let it go now and hope for the best.