针对某型液压挖掘机下坡制动延时故障,结合试验数据,分析故障原因为:平衡阀复位延时,致使挖掘机制动延时,因重力作用马达变泵,加速下滑,导致超速运转,且制动产生很高的冲击压力,损坏了马达。提出应对措施:加大平衡阀节流孔,并且在行走先导油路上加装单向节流阀。试验表明,采取的应对措施有效,效果良好。 Aiming at the failure of a type of hydraulic excavator downhill braking delay, combined with the test data, the analysis of the cause of the failure is as follows: balance valve reset delay, causing the excavator braking delay, due to gravity motor change pump, accelerate the decline, And the brake has a high impact pressure, damage the motor. Proposed countermeasures: increase the balance valve orifice, and the installation of pilot oil on the road to install one-way throttle. Experiments show that the response measures taken are effective and effective.