Smell if the motor has a strong smell of paint, and if so, there may be an open circuit in the motor. It is common for a motor to break circuit and cause a trip. Take down the motor and have it repaired&  

   If it's not about the motor, check the transmission part of the machine to see if there are any areas where the transmission is not working properly. If it needs to be refueled, add some oil and clean it. If the transmission part is not working properly and the current load increases, it may also cause tripping

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