1. Ask is a survey. Understand the mileage that the vehicle has traveled, the road conditions of the road, the recent maintenance situation, and the premonition before the failure, whether it is a mutation or a gradual change. 2. Look to see the smoke color. 3. Hearing and hearing are used to determine the abnormality of the sound of agricultural vehicles and where they come from. 4. Smell some special odors emitted in the transport of agricultural vehicles to determine the fault. This is a simple and effective method for troubleshooting common faults such as circuits and friction linings. 5. Touching is to touch the temperature, vibration, etc., which may cause a malfunction, so as to judge whether the bearing is too tight or not, and whether the diesel pipeline has oil supply pulsation or the like. 6. Trial personnel personally test the car. Single-cylinder misfiring (oil-losing method) can be used to determine the location of abnormal engine noise, and replacement parts can also be used to verify the location of the fault.
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