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我单位装备的10台上海120A 推土机,在使用中出现液压系统动作缓慢,发出噪音,铲刀操纵杆升降沉重的现象,拧松油箱盖故障现象立即消失,或停放一天也能恢复正常。经检查分析,造成上述故障的原因是工作油箱没有设置通气孔。由于油箱不与大气相通,液压系统工作时在油箱内产生“真空”,随着油泵转速升高,时间延长,真空度越来越大,使油泵吸油困难,
The 10 Shanghai 120A bulldozers equipped by our company experienced slow movement of the hydraulic system, noise emission, and heavy lifting of the blade lever during use. The phenomenon of unscrewing the fuel tank cover disappeared immediately, or it could return to normal one day after parking. After inspection and analysis, the cause of the above failure is that the working oil tank is not provided with vent holes. Since the fuel tank is not connected to the atmosphere, the hydraulic system produces a “vacuum” in the tank when it is working. As the speed of the oil pump increases, the time is prolonged and the degree of vacuum becomes larger, making it difficult for the oil pump to absorb oil.