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一台泰安产QY20t汽车起重机,使用中出现回转减速机润滑油位显示管上端接头处漏油的故障（见图1）。分析其原因可能
A Thai production QY20t truck crane, the use of slewing reducer lubricating oil level shows the top of the pipe joints at the oil leakage fault (see Figure 1). Analysis of the reasons may be