１．故障现象我公司一台神钢８５ＰⅡ８０Ｃ打桩机在施工时传动系中突然出现了不规则的“咔啦”声，拿掉第三、四卷筒外面的罩壳后看到，第三、四卷筒的内胀机构在离合器接合时并不转动。当时初步诊断为Ｉ轴３与蜗轮５相连接的键剪断了。当拆开后却发现蜗杆４上有几个齿已被打 1. Symptoms When a company’s Kobelco 85PII80C pile driver suddenly saw an irregular crack in the drive train during construction, he saw the third and fourth volumes after removing the outer shell from the third and fourth drums. The inner expansion mechanism of the barrel does not rotate when the clutch is engaged. At the time, it was initially diagnosed that the key connecting the I axis 3 and the worm wheel 5 was sheared. When dismantled, it was found that several teeth on the worm 4 have been hit