ET80型步履式挖掘机因其强大的通过性、良好的适用性,吸引了越来越多用户的关注。该型步履式挖掘机采用工业计算机对其液压系统进行控制,可实现复杂行走动作,可爬上倾斜度不大于45°的坡道,能够在不大于30°的斜坡上正常工作(见本文照片)。由于步履式挖掘机可完成上述动作,这就要求其各液压执行元件动作必须精准,才能完全按照操作指令协同动作。1.故障现象我们在对1台ET80型步履式挖掘机进行测试时,发现其在做铲斗和回转复合动作时,回 ET80 walking excavator because of its strong passability, good applicability, has attracted the attention of more and more users. This type of walking excavator uses an industrial computer to control its hydraulics for complex walking operations and climbs a ramp of no more than 45 ° and is capable of working on slopes not greater than 30 ° (see photo ). As the walking excavator to complete the above action, which requires its hydraulic actuators must be precise action in order to fully cooperate in accordance with the operating instructions. 1. Symptom When we tested a ET80 walking excavator and found that it was doing backflushing and turning back