QY8型汽车起重机在使用过程中,曾出现双联液压泵泵体开裂的现象。经分析,可能有两个原因,一是泵体强度不够;二是溢流阀的调整压力太高。排除此故障的方法是:首先在液压试验台上给双联泵及溢流阀打压,结果泵体承受的极限压力达25 MPa,符合强度要求;溢流阀的开启压力正常,性能良好。因此, QY8-type truck crane in the course of use, there have been double-acting pump body cracking phenomenon. After analysis, there may be two reasons, one is the pump body strength is not enough; the second is the pressure relief valve to adjust the pressure is too high. The way to get rid of this trouble is: firstly, press the double pump and the relief valve on the hydraulic test bench, the result is that the ultimate pressure of the pump body is up to 25 MPa, which meets the strength requirements; the opening pressure of the relief valve is normal and the performance is good. therefore,