Sixth, the pump is the power component of the hydraulic system, its role is the original motivation of the mechanical energy into fluid pressure energy, the hydraulic system of pumps used excavators network, which provides power to the entire hydraulic system. So check the hydraulic pump is also very important, when you buy two mobile phones to hand to touch the pump, there is no shock to observe hand feeling, and then check the pump there is no crack, if there is a serious case of oil spills, the test to observe the pump It is powerful, with or without noise. Seventh, check the electrical system, if the circuits are working properly, then check the motherboard into the computer system, you can see into the system if the operating conditions, such as the number of revolutions, pressure, maintenance mode, then prove that normal computer board . Check engine warm-up drive launched after the operation, skew side of the machine to make it stand alone track, sequential rotation were standing on both sides of the track. Note that within 30 seconds, or 60 seconds how many times such an operation can be completed, and then compared with the other track. Excavator crawler device is a built-in flow meter imported second-hand excavators, if not the same flow both micro used excavators, then there is doubt. Another method of detection is to control the operation of the excavator on the ground 10 meters, if running in a straight line, it is possible to know the same on both sides of mobile equipment operating condition is good. See also the same inversion ring gear and reverse bearings. Under normal circumstances, the upper part of the engine can be smoothly and accurately reverse parking, only a few or no errors. For small excavators, its reverse ring gear and reverse bearing the same machine should have the same number of long life, and therefore had to pay attention to any of this, some questions. Used excavator chain | Shanxi used excavators | used excavators Kim Ho Jin Hao from Shanghai Used Construction Machinery Co., Ltd. Shanghai Jin Hao Used Construction Machinery Co. (www.jinhaosh.cn) strong, credible, in Shanghai Minhang District of mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead jinhao used excavators into the brilliant and you work for a better future!