First, it is impossible to correctly judge the analysis of faults, and the phenomenon of blindly dismantling and unloading is commonplace.
Some maintenance personnel are unclear about the mechanical structure and principle of the equipment, do not carefully analyze the cause of the failure, can not accurately determine the fault location, blindly dismantle the equipment with the "probably, almost" idea, the result is not only the original fault is not ruled out, and Due to poor maintenance skills and craftsmanship, new problems have arisen. For example, a station once had 120KW diesel generators with insufficient power and mechanical failure. The maintenance personnel disassembled and disassembled the PT fuel injection pump and the fuel injector and found the cause of the failure. Replaced one fuel injection pump test and the fault remained. The final inspection failure was caused by excessive impurities and moisture in the diesel used. The disassembly caused the performance of the PT fuel injection pump to drop significantly, and the diesel generator power was insufficient.
Therefore, when the machine fails, it must be tested by the testing equipment; if there is no testing equipment, the traditional fault judgment methods and means such as “question, see, check, test”, combined with the structure and working principle of the equipment, determine the most The part where the malfunction may occur.
When judging equipment failure, the "exclusion method" and "comparative method" are generally used, and the order is from simple to complex, first and then internal and first assembly, and avoid "not asking for indiscriminate, blindly dismantling and unloading" .