2 如果没在规定范围内,则导致R280型现代挖掘机铲斗无力故障成因为"挖掘机主泵2的溢流阀压力失灵"
3 故障成因得出,解决方法为"按规定值调节压力或更换该阀"
【检查结论】:经过故障排查为"挖掘机主泵2的溢流阀压力失灵"
【维修结果】:维修后R280型现代挖掘机铲斗无力故障排除,挖掘机恢复正常工作
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