推荐回答（1个）
神钢SK140LC-8挖掘机系统无油导致这个故障出现的常见的原因有7点，当出现这个故障的时候挖掘机师傅可以按照以下故障原因来维修故障：
1、油泵不吸油。
2、油泵的驱动装置失效。
3、油泵和驱动装置的连接切断。
4、驱动油泵的电动机反接。
5、油泵的进出口接反。
6、油从安全阀返回。
7、油泵损坏。
以上就是液压挖掘机系统无油故障的7个常见原因，那么相对应的故障维修方法如下:
1、更换滤清器，更换工作油，调整泵速。
2、柴油机应修复或者是更换，检查电气线路。
3、更换或者是调整。
4、调换线路接头。
5、改变进出口接头。
6、调整压力阀压力，检查或者是更换原件。
7、检查或更换。
B、液压挖掘机系统油不足导致故障出现原因:
1、流量控制阀调整不当，要重新调整。
2、安全阀或是卸荷阀调整不当，也要重新调整。
3、系统外漏，要紧固连接接头，排除空气。
4、液压原件磨损，要检查，更换。
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