Hayward Model # sp1515-z-1-esc

Started out the year with a hum. Was able to spin the shaft and get her running. Ran it dry last week Hope/think it has an auto-shut off for overheating. Now, we only have the hum again. Shaft spins easily. Took off back cover yesterday (dry end) and saw nothing corroded or burned. Spins easily from that side too. No capacitor on this one as far as I can tell.

Can not find a diagram of the inside of the dry end of this pump.

Any advice?