Scraper hydraulic system of a complete hydraulic system consists of five parts, namely, power components, actuators, control components and auxiliary components (Annex) and hydraulic oil. The role of dynamic element dynamic components of the original motivation of the mechanical energy into fluid pressure energy, refers to the hydraulic system of pumps, which provides power to the entire hydraulic system. Design of the hydraulic pump gears are generally pumps, vane pumps, piston pumps and screw pumps. Action actuators actuators (such as hydraulic cylinders and hydraulic motors) is the pressure of the liquid can be converted to mechanical energy, specialized hydraulic automation equipment, drive the load for linear reciprocating motion or rotary motion. Control element control element (ie the various hydraulic valves) to control and regulate fluid pressure, flow rate and direction in the hydraulic system. Depending on the control functions, hydraulic valves can be divided into pressure control valves, flow control valves and directional control valves. Pressure control valve comprises a pressure relief valve (safety valve), valves, sequence valves, pressure switch, etc; the flow control valve includes a throttle valve, regulating valve, flow diversion valve and the like; directional control valve includes a check valve, hydraulic control check valves, shuttle valves, valve and the like. Depending on the control mode, the hydraulic automation equipment, hydraulic valves can be divided off control valve, fixed value control valves and proportional control valve. Auxiliary components Auxiliary components, including fuel tanks, oil filters, coolers, heaters, accumulators, pipe and pipe fittings, seals, quick connectors, high-pressure valve, hose assembly, pressure joints, pressure gauge, oil level gauge , oil temperature meter. Hydraulic oil hydraulic oil in the hydraulic system of the working medium energy transfer, a variety of mineral oil, emulsion oil hydraulic molding Hop categories. The basic idea is a comprehensive analysis evaluated. That maintenance personnel by observing, listening, touching and simple test and hydraulic systems to understand, empirically determine the cause of failure. When the hydraulic system fails, there are many possible root cause. Algebraic methods using logic, the list of possible causes of failure and difficult one by one according to the principles of logic is easy after the first judgment, itemized approach, ultimately identify the cause of the failure and the specific conditions that cause failure. Troubleshooting process requires maintenance personnel with basic knowledge and analysis of hydraulic systems strong ability, can only be assured efficiency and accuracy of diagnosis. However, the diagnostic process is relatively complex, subject to a large number of checks, verification, hydraulic automation equipment, and only qualitative analysis, diagnose the cause of the fault is not accurate enough. In order to reduce blindness and empirical and dismantling work, hydraulic automation equipment OEM, traditional fault diagnosis method has been far from meeting the requirements of modern hydraulic system fault detection system. With hydraulic systems to large-scale, continuous production, automatic control direction, and the emergence of a variety of modern fault diagnosis. Spectrum technology such as iron off the number can be separated from the oil out of a variety of grains, shape, size, composition and distribution, etc., timely and accurately determine the wear parts of the system components, form, degree. But also of the hydraulic oil contamination quantitative analysis and evaluation, so that line detection and fault prevention. Diagnosis is based on artificial intelligence expert off, there are ways through the computer to mimic the experience of experts to solve problems in a field. The fault phenomenon through human interface into the computer, the computer based on the phenomenon of input and knowledge in the knowledge, you can calculate the cause of the fault, and then outputs the reason for man-machine interfaces, and proposed maintenance program or precautions. These methods to the hydraulic system fault diagnosis bring a broad prospect, to the hydraulic system fault diagnosis automation foundation. However, most of these methods require expensive testing equipment and sophisticated sensing control systems and computer processing systems, some methods study has certain difficulties, generally not adapted to promote the use of the site. Here's a simple, practical hydraulic system fault diagnosis. 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