<P>1, can not correctly determine the analysis of the fault, blind large demolition of the phenomenon of common dumping: some maintenance personnel due to the construction machinery structure, the principle is not clear, do not seriously analyze the cause of failure, can not accurately determine the fault location, with "probably, almost" Thinking blindly on the mechanical demolition of large unloading, the results not only the original failure is not ruled out, and because of poor maintenance skills and technology, there are new problems. Therefore, when the mechanical failure, through the detection equipment for testing, such as no testing equipment, through the "ask, see, check, try" and other traditional methods and means of fault diagnosis, combined with the structure and working principle of engineering machinery to determine Most likely to fail. In the determination of engineering machinery failure, the commonly used "exclusion method" and "comparison method", in accordance with from simple to complex, first appearance after the internal, first assembly and then the order of parts, avoid "do not ask indiscriminate, blind large demolition ".</P>
<p>2, blindly replace parts, blindly "for repair" phenomenon exists in varying degrees: engineering machinery failure to determine and exclude some of the more difficult, and some maintenance personnel has always used a change of the test method, regardless of small pieces, as long as that May lead to failure of the parts, a replacement test, the results not only failed to rule out, and should not be replaced parts of the free replacement, an increase of consumer spending. And some faulty parts can be restored through the repair of its technical performance, do not need complex repair process can be repaired, but the maintenance staff asked the user to replace the new pieces, blindly take "repair parts" approach, resulting in serious waste. The blind practice of the above-mentioned parts and the replacement of the repairable parts in some repair units also exist in varying degrees. In the maintenance, should be based on the phenomenon of failure to seriously analyze and determine the cause and location of the fault, to repair the parts to be repaired to restore technical performance, to eliminate the blind replacement parts of the practice.</p>
<p>3, do not check the quality of new pieces, the problem after the installation of the more common problems: the replacement parts, some maintenance personnel on the new parts do not do technical checks, used directly after installation to the construction machinery, this approach is unscientific The Currently on the market for the sale of spare parts of the quality of good and bad, some fake and shoddy accessories fish; also some accessories due to inventory time is too long, performance changes, such as without detection, after assembly often cause the occurrence of failure. In the replacement of new parts must be carried out before the necessary inspection and testing, including the appearance and performance testing, to ensure that the new accessories without failure, to prevent unnecessary trouble caused by it.</p>

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