Check the motor's ventilation holes. Blocked ventilation holes are the major cause of overheating. Remove anything blocking the holes.
Move the motor indoors. Debris, such as dirt, insects and leaves, get stuck in an outdoor motor, causing it to overheat. If you put the motor indoors, place it in a low-humidity room. High-humidity rooms, such as the bathroom or laundry room, also cause overheating.
Drape a light cover over the motor if you cannot place it indoors. The cover protects the motor from debris and provides shade from the sun.
Check the motor's internal cooling fan. If the fan does not turn, the motor overheats. Repairing or replacing the fan keeps the motor cool.
Connect the motor to a different electrical outlet. The outlet you have been using may not supply the proper voltage to the motor.