一台ZL40型装载机,中修后试机发现发动机飞轮壳检视口边缘有几滴液压油,且行走缓慢,工作无力,但行走压力正常。该机中修时更换了变矩器和变速器的所有密封件及导轮座、旋转密封环、分动齿轮、变速泵和转向泵。为进一步确定故障部位,将变矩器检视口盖打开。启动发动机发现,液压油沿着泵轮旋转的切线方向外甩,且甩油量随着发动机转速的升高而增多。分析认为主要原因是：转向泵或工作液压泵的骨架油封损坏,导致油箱的液压油窜入变速器；泵轮与涡轮罩接合不平整,液压油从缝隙处直接甩出；变矩器分动齿轮与导轮座间的旋转密封环严重磨损或断裂；变矩器回油管堵塞,造成负压 A ZL40 loader, after repair machine found a few drops of hydraulic oil on the edge of the engine flywheel viewport, and walking slowly, work weak, but the normal walking pressure. During the repair of the machine, all the seals and the guide wheel seat, the rotary seal ring, the transfer gear, the variable speed pump and the steering pump of the torque converter and the transmission are replaced. To further identify the fault location, open the torque converter view cover. Start the engine found that the hydraulic oil along the tangential direction of rotation of the pump thrown rejection, and rejection of oil with the engine speed increases. Analysis that the main reasons are: the steering pump or hydraulic pump oil seal skeleton damage, leading to the fuel tank fleeing into the transmission; pump impeller and the turbine cover is not smooth, the hydraulic oil thrown directly from the gap; torque converter transfer gear And guide wheel seat between the rotating seal ring serious wear or tear; torque converter back to the blocked, resulting in negative pressure