我单位一台ZL50装载机在使用过程中发现,动臂和铲斗工作缓慢无力,举升时间长达16s以上。起初,我们认为是液压泵效率低,所以更换了新的齿轮泵,但故障仍然存在。于是检查动臂内部有无泄漏。经试检油缸密封良好,不会出现内泄漏情况。最后检查液压分配阀,发现阀内液压油泄漏严重,工 My unit ZL50 loader found in the course of use, boom and bucket work slow and weak, lifting time up to 16s or more. At first, we thought the hydraulic pump was inefficient, so we replaced the new gear pump, but the problem persisted. Then check the boom for leaks. The test cylinder sealed well, there will be no internal leakage. Finally check the hydraulic distribution valve and found that the hydraulic valve leak serious, workers