First, the maintenance staff should have the basic knowledge

Before the excavator repair, to carefully read the random use of maintenance instructions to the aircraft hydraulic system has a basic understanding. At present, the small and medium-sized excavator hydraulic system is almost always by the main oil and pilot oil pipeline composed of two parts; the main road with dual pump dual loop variable open system, the pilot operating oil are all quantitative system. By reading the technical information, to master the main parameters of its system, such as the main safety valve opening pressure, pilot operating pressure and flow, etc .; familiar with the system schematic diagram, master the system symbol and the relationship between the symbol, The structure and working principle of each hydraulic element should also be understood; analyze the possible causes of a failure; the control machine to understand the location of each hydraulic components, and the connection between them. Specific diagnosis of failure, should follow the "outside to inside, first easy after the difficulty" of the order, leading to a possible cause of a breakdown of the investigation.

Second, the scene fault diagnosis

Field diagnosis of hydraulic system failure of the main method or experience diagnosis method. Experience diagnosis method is that the maintenance staff to use the knowledge has been mastered and accumulated experience, combined with the actual situation, the use of "ask, see, listen, touch, try" means to quickly diagnose the location and cause of a fault method.