What is the reason why Komatsu 360-7 suddenly drops from high speed to idle speed when working?

There are many reasons for the landlord's problems. According to the procedure of repairing the car, according to the principle of electrifying before refueling, first check whether the spark plug and flashover are normal, and then check whether the dirt of the throttle valve needs cleaning. In the case of poor driving environment, it is recommended to wash it every 5000 kilometers, and then look at the working conditions of idle motor and gasoline pump and check them one by one.