1. Simple fault diagnosis method
(1> Inquire the equipment operator to understand the operation status of the equipment. This includes: whether the hydraulic system is working properly; whether the hydraulic pump is abnormal; the time and result of the cleanliness of the hydraulic oil test; the cleaning and replacement of the filter element; whether it is correct before the failure The hydraulic components have been adjusted; whether the sealing components have been replaced; what abnormalities have occurred in the hydraulic system before and after the fault; what faults have occurred in the system in the past, how to eliminate them, etc., need to be understood one by one.
(2> Look at the actual status of the hydraulic system, and observe whether there are problems with the system pressure, speed, oil, leakage, vibration, etc.
(3> Listen to the sound of the hydraulic system, such as: impact sound; pump noise and abnormal sound; determine whether the hydraulic system works normally.
(4) Touch the temperature rise, vibration, crawling and the tightness of the joint to determine whether the working state of the moving parts is normal.
In short, the simple diagnostic method is just a simple qualitative analysis, which has a wide range of practicality for rapid judgment and troubleshooting.
2. Hydraulic system schematic diagram analysis method
Analyze the faults in the hydraulic transmission system according to the schematic diagram of the hydraulic system, find out the location and cause of the fault, and propose a method to eliminate the fault. The hydraulic system diagram analysis method is currently the most common method applied by engineering and technical personnel. It requires people to have a certain foundation in hydraulic knowledge and understand the hydraulic system diagram. Master the names, functions, principles, and structure of the components represented by each graphical symbol And the performance should also have a certain understanding. With such a foundation, it is easy to analyze and judge the failure in combination with the action cycle table. Therefore, carefully studying the basic knowledge of hydraulic pressure, mastering the hydraulic schematic diagram is the most powerful assistant for fault diagnosis and elimination, and it is also the basis of other fault analysis methods.
3. Other analysis methods
When the hydraulic system fails, it is often impossible to immediately find out the location and source of the failure. In order to avoid blindness, people must logically analyze the hydraulic system principle or use causal analysis to eliminate them one by one, and finally find the location of the failure. Is to use logic analysis to find the fault. In order to facilitate application, fault diagnosis experts have designed logic flow charts or other charts to make logical judgments on faults, which provides convenience for fault diagnosis.
