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1．油系发热我矿使用的一台WJD－0．75型电动铲运机，铲斗工作液压系统，出现油泵发热现象，更换一台新油泵使用几小时，就出现油泵断轴事故。诊断后认为是多路换向阀的安全阀出毛病，换下多路换向阀，铲运机恢复正常。为了查清故障，将多路换向阎拆开检查，其安全阀构造与先导
1. Oil heating I used mine a WJD-0.75 electric scraper, bucket hydraulic system work, the emergence of the oil fever, replace a new pump to use a few hours, the pump cut off the accident occurred. After the diagnosis is considered multiple valve safety valve out of order, replace the multi-way valve, scraper returned to normal. In order to find out the fault, the multi-way Yan Yan open inspection, the safety valve structure and pilot