Hi, I have a 3HP motor running continuously. After about 5 years it has stopped, flicked breaker and it continued. That happened a few times. More recently, now 10 years, it stopped and wouldn't start. I tried a few things, but turning the motors shaft seemed to get it to work when power was restored. I tried that method again when it failed a number of times, but each time it seemed harder to re-start. It failed again, but this time it doesn't want to start. What is likely wrong with the motor that causes these type symptoms? Brushes? Some other item in the motor? The bearings squeak a little so I'd wondered if they would stop it, but the shaft has always rotated, so it mustn't be the reason for it not re-starting (even if it may make the motor fail if overheated/seizing while running). I'd like to get an idea of what normally goes wrong/symptoms/troubleshooting in motors, and which parts age/would be best replaced on an overhaul after 10 years, even if they are still working, but are likely to fail because of the motor age. Thanks.