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在70年代初期，由于机动灵活、操作容易和作业速度快，液压挖掘机获得了迅速的发展。尤其是在中、小型产品的规格方面进一步的发展，使它胜过了众多竞争对手。然而，偏于保守的采矿界考虑到大型矿山的设备投资和运营费用，对斗容20m3以上的液压挖掘机的可靠性是否能放得过钢绳
In the early 1970s, hydraulic excavators enjoyed rapid growth due to their mobility, ease of operation and fast operation. In particular, the further development of the specifications of medium and small-sized products makes it outperform many competitors. However, the more conservative mining industry takes into account the equipment investment and operating costs of large-scale mines and whether the reliability of the hydraulic excavator with the capacity of more than 20m3 can be released