I'm new, not sure if anyone will even see this but here goes.. I have a Hayward super pump dual speed.. It's just stared to hum, and then immediately shuts off. I've checked the capacitor and it reads ok .. The pump is only 2 years old. I checked the shaft and seems to spin freely.. I'm not sure what to check next.. I guess I can pull the motor and really check inside but it's been working fine..