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1台230-6E型挖掘机只要作业1h,即会出现斗杆回收缓慢无力故障,其他动作均正常。分析认为,P1泵与P2泵先导操纵手柄、斗杆阀、斗杆合流阀、斗杆低压传感器、斗杆合流、P1泵中立切断比例电磁阀以及斗杆回收溢流阀等部位出现问题,均会造成上述故障。首先,通过显示屏查看斗杆回收时P2泵的油压为32MPa(属正常范围),P1泵的油压为0(应为22.5MPa以上),由此可知斗杆回收时P1泵没有参与工作。其次,操纵挖掘机做各种动作,在斗杆回收时显示屏显示低压传感
1 Taiwan 230-6E type excavator as long as the job 1h, that is, there will be slow arm weak recovery failure, the other movements are normal. Analysis, P1 pump and P2 pump pilot control handle, stick valve, stick confluence valve, stick low pressure sensor, stick confluence, P1 pump neutral cut-off proportional solenoid valve and arm recovery overflow valve and other parts of the problem, both Will cause the above failure. First of all, P2 pump hydraulic pressure is 32MPa (normal range), P1 pump hydraulic pressure is 0 (should be 22.5MPa above) through the display to see when the stick recovery P2 pump recovery P1 pump did not participate in the work . Second, the excavator to operate a variety of actions to do when the stick recovery display shows low-pressure sensor