A、液壓缸機(jī)械故障 B、感應(yīng)開(kāi)關(guān)故障 C、電磁閥故障 D、液壓油壓力低
A、打開(kāi)拱頂平衡閥 B、關(guān)閉進(jìn)出旋轉(zhuǎn)閥拱頂密封液 C、關(guān)閉進(jìn)旋轉(zhuǎn)閥拱頂密封液 D、打開(kāi)拱頂平衡閥或者手動(dòng)打開(kāi)拱頂排出壓力控制閥