If an electric motor is smoking, most likely it is in the process of burning out the windings in the motor. This usually starts from using an extension cord that has too small a wire or a cord that is too long. when you do thid you are forcing the motor to pull more amps than it should to make up for the voltage loss in the cord.
The fuel for the electric motor is a term called watts. Watts equals volts times amps. If the voltage drops then more amps are needed to feed the motor enough watts. This caused the motor to over heat and this melts or breaks down the insulation on the windings. When this happens the motor starts to short out and once this happens then you can not save the motor.
Electric lawn equipment should be used with #14 or #12 (never use #16 or #18 gauge ) guage extension cords and should not be used with cords longer than 50 feet. Also you should not run the equipment more than 10 minutes with out a 30 minute rest.
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