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W4-60C excavator brake air system, the gas pump and gas storage tube with a gas control valve (see photo), its main function is to separate compressed air oil and water, filter compressed air in the dust and impurities, Prevent the compressed air in the cylinder back to the gas pump to ensure gas pressure stability in the range of 0.490-0.637MPa, the maximum pressure does not exceed 0.784MPa. The following faults often occur in use: 1, adjusting screw 2, pressure regulating valve body 3, spring seat 4, spring sleeve 5, sealing plug 6, pressure regulating diaphragm 7, slide valve 8, slide valve 9, plug 10, spring 11 Funnel 12 Exhaust piston 13 Screw 14 Dust cover 15 Safety valve body 16 Safety valve body 17 Adjusting screw 18 Small spring 19 Large spring 20 Spring seat 21 Exhaust valve 22 Card Ring 23 adjusting spacer 24 valve stem 25 diaphragm 26 valve 27 seat 28 check valve spring 29 check valve 30 filter 31 O-ring 32 vacuum cleaner 33 fixing screw 34, the fixed screw 34, O-ring 1, the pressure regulator valve due to the diaphragm is damaged and leakage of gas diaphragm 6 for the rubber products, due to its frequent repeated pressure stamping, repeated arching, reset action, By gas, water corrosion, so often make the diaphragm damage, this is the most prone to the control valve failure. 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. 3, filter damage Filter is mainly used to filter out dust and impurities in compressed air to prevent such substances into the excavator's braking system. It consists of filter 30, vacuum pad 32 and the fixed plug 33, if used for a long time, maintenance is not timely, it is easy to filter wire damage, suction pad damage. Therefore, maintenance should be carefully maintained, if damaged should be promptly repaired or changed. 4, the pressure regulator to adjust the pressure is too high or too low During normal operation, if the gas pressure in the gas cylinder reaches 0.637MPa, the pressure relief valve to the lower part of the pressure relief, the pressure inside the gas cylinder no longer rise. When the gas pressure in the gas storage tank is lower than 0.49MPa, the pressure should not be released anymore. The adjustment of the air pressure can be realized by changing the pressing force of the large spring 19 by adjusting the screw 1 (tightening, gas rising, unscrewing and pressure reducing). If the air pressure is still not normal after the adjustment, there are two situations: Barometric pressure has been exceeded but failed to exhaust pressure relief. At this point should consider whether the operation of the exhaust piston 12 blocked, as the piston O-ring 34 is too tight, the exhaust piston lower spring 10 is too strong, so that normal pressure gas can not promote the piston operation should be uniform Cut the outer ring seal or adjust, replace the spring. If the pressure regulator valve is compressed within the small spring 18 is too tight, the thimble 8 is difficult to push the plug 9 blocked axial hole, etc., can make the pressure can not be unloaded; the second is the pressure has not yet reached the required pressure relief relief. One reason for this is that the pressure regulating diaphragm leaks and the other is that the small spring in the pressure regulating valve is too loose (or even broken) or the thimble can be pushed at a lower pressure to make the small hole in the pressure regulating valve casing AA view in the drawing) constantly leak, resulting in the system can not increase the pressure. In this case should first remove the adjustment screw on the valve 1, first adjust or replace the small spring, and then adjust the large spring. 5, the safety valve to adjust the pressure is not normal The role of the safety valve is to ensure that the pressure inside the gas cylinder does not exceed 0.78MPa. If the pressure exceeds 0.78MPa safety valve is still not relief, will continue to increase the pressure inside the gas cylinder. This may be the safety valve diaphragm 25 leaks, safety valve spring 16 caused by; if the pressure does not meet the requirements on the pressure relief, because the poor spring weakness, not enough pre-tightening, valve 26 and seat 27 is not sealed cause of. At this time should be adjusted or replace the damaged parts. 6, gas storage tank back to stop after the gas In order to prevent the gas cylinder gas back in the shutdown, the control valve is provided with a check valve 29, if the gas cylinder back to the pump after the shutdown, the failure is mostly due to one-way The valve spring 28 is too weak or broken and has no effect. The spring should be adjusted or replaced. Excavator working pressure maintained at 0.490-0.637MPa range, the maximum pressure shall not exceed 0.784MPa, when the pressure appears abnormal, should adjust the pressure regulating valve and safety valve. For mechanical adjustment, the safety valve should be adjusted in the following order. The adjustment method is as follows: â‘ Loosen the fixing nut on the adjusting screw of the pressure regulating valve, and then screw the adjusting screw all the way down so that the lower exhaust valve can not be opened. â‘¡ observe the safety valve pressure at 0.784MPa exhaust from the vent. Such as the pressure is not normal can be adjusted by adjusting the shim 23 to adjust; gas pressure is low when the gaskets increase, while reducing shims, gas shims for each additional 1mm adjustable 0.036MPa. â‘¢ adjust the pressure regulator valve slowly withdraw until the exhaust valve is open until the exhaust valve, if the pressure is just 0.637MPa at this time is the best. â‘£ repeatedly rubbing the excavator brake pedal or deflated the gas cylinder should be observed at this time back pressure (exhaust piston is closed) is between 0.490-0.539MPa, if the back pressure is less than 0.490MPa, while the upper vent At the same time exhaust, this time should adjust the pressure of small springs. ⑤ repeatedly adjusted and tested until it meets the requirements.