This image is a follow up to an attempted repair of only tightening the center phase lug, despite a recommendation to replace the breaker. Between the time of the initial finding and the follow up, the temperature increased from 140 F to 176 F. The internal temperatures would be higher and moving the breaker closer

Nice example of fan belt – drive of process cooling tower fan in pre-failure mode. The heat is cause by an increase in friction. Belt drive could be too tight, too loose or pulleys misaligned. Further investigation can find problem and correct before failure unexpectedly occurs. Thermal Techniques puts the full power of thermal imaging