1台ZL50型装载机在使用500h后,出现动臂与前机架铰接处的2个销轴外窜的故障。检查发现,2个销轴锁板已发生变形,严重影响整机性能及使用安全。经分析,造成该故障的原因,一是结构件加工误差过大,二是销轴和衬套磨损严重,三是动臂与机架铰接处轴向间隙过大。 A ZL50 loader 500h after the use of the boom and the front frame at the hinge pin 2 outside the channeling failure. Inspection found that the two pin lock plate has been deformed, a serious impact on overall performance and safety. The analysis of the causes of the failure, one is the processing of structural parts is too large, the second is a serious wear and tear pin and bushing, the third is the boom and the frame hinge axial clearance is too large.