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W4-60C type excavator brake air system, equipped with gas control valve between the pump and the reservoir, its main function is to separate oil and water in compressed air, filter the dust and impurities in the compressed air to prevent compression in the reservoir Air back to the pump, to ensure gas pressure stability in the 0.490-0.637MPa range, the maximum pressure does not exceed 0.784MPa. The following faults often occur during use: 1. The pressure regulating valve is damaged due to the pressure of the diaphragm, and the diaphragm 6 is a rubber product. Due to the frequent punching of the pressure, repeated arching and resetting, the gas, moisture Of the corrosion, so often make the diaphragm damage, this is the most prone to failure of the control valve. After the diaphragm is damaged, the compressed gas from the air pump enters the upper part of the pressure regulating valve through the diaphragm without entering the gas storage cylinder, so that the pressure of the gas storage cylinder can not rise. At this point pressure regulator valve temperature is easy to increase, the brake system barometer shows the lack of pressure, pressure regulator valve can be heard at the leak sound. 2, the control valve housing rupture The valve housing by the upper, middle and lower parts, respectively, with screws. As the shell made of aluminum, in the decomposition or combination, if the demolition, install the screw method is improper, easy to make the shell rupture. Faults in the demolition, install the screw, should be diagonally and in multiple tightening or loosening, so that the shell according to the force on the face ç» consistent, to prevent damage due to uneven force.
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