First, conduct a comprehensive analysis based on the various aspects of your grasp. You should search for the most likely cause, and then search for the rare reason that is unlikely. One by one negate the possibility of failure of certain systems, mechanisms or components, narrow the scope of failure analysis, and finally determine the main cause and location of the failure and eliminate it.
Here are several simple diagnosis methods:
Non-disassembly inspection method
In order to accurately judge the fault and avoid improper disassembly of some complex parts, some special instruments and equipment can be used to directly or indirectly check the technical status of the relevant parts, that is, no disassembly check. For example, using a pressure gauge and connecting accessories, you can check the pressure of the cylinder; check the oil pressure of the injection pump; check the pressure of the lubricating system oil passage, etc.
颁辞尘辫补谤颈蝉辞苍
Replace the parts on the engine with parts with normal technical status, or exchange the same parts on the engine with each other. By comparing the change of the fault phenomenon before and after the replacement, the technical status of the replaced parts can be judged. For example, on a multi-cylinder engine, the two-cylinder injectors are sometimes swapped to see if the fault phenomenon is transferred to determine the technical status of the injectors.
Partial stop method
Stop the work of a part or a part for a short time, observe the change of the fault phenomenon, and determine the location of the fault. For example, when analyzing engine failures, the "cylinder break method" (for multi-cylinder engines) is commonly used.
Exploring the Law of Retesting
Try to change the working conditions or technical status of a part, and observe the change of the fault phenomenon to determine the part where the fault occurs. For example, when it is suspected that the piston, piston ring and cylinder wall are severely worn, a small amount of engine oil can be poured into the cylinder. If the compressibility becomes better, the suspicion is true.
Conclusion
At present, hydraulic excavators have been widely used. The common failures of general excavator engines are manifested in the above aspects. As the use of excavators increases, some common failures that often occur in construction operations, therefore, the technical quality of the team should be strengthened And have advanced excavator maintenance equipment, reduce the occurrence of failures, and ensure the smooth progress of project construction.
