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我局一台UH083挖掘机各个动作速度都缓慢,于是我们对其进行了全面检测:先测了发动机转速、气缸压力等参数,结果表明发动机性能良好;然后接压力表对两主泵及先导泵油路的压力进行了测试,均在允许范围之内;最后,串接流量计(PFM9-20O)测量了前后两主泵的流量,结果如下: 前泵:①液压泵变量拉杆在达到其最大排量的2/3行程时,泵的输出流量从17OL/min突然下降到约6OL/min,以后不再回升。最大排量位置时,标准流量为220L/min,此时泵的容积效率仅为27.3％(发动机转速为1951
I Bureau of a UH083 excavator all movements are slow, so we conducted a comprehensive test: first measured the engine speed, cylinder pressure and other parameters, the results show that the engine performance is good; then pressure gauge on the two main and pilot pumps Finally, the series flow meter (PFM9-20O) measured the flow of the two main pumps before and after, the results are as follows: Front pump: ① hydraulic pump variable rod reaches its maximum At 2/3 stroke of the displacement, the output flow of the pump suddenly drops from 17OL / min to about 6OL / min and will not rise again later. The maximum displacement position, the standard flow of 220L / min, then the pump volumetric efficiency of only 27.3% (engine speed 1951