1设计目的我厂主要生产QT120、TY122、TY150推土机系列产品，其台车总成中的支重轮、托链轮、引导轮的渗漏油问题一直很难得到妥善解决，往往在整车装配完毕后才发现个别轮有渗漏油情况。其主要原因是以前采用的“三轮”渗水式泄漏部位检测法（即在“三轮”润滑腔内注入15MPa压 1 Design purpose Our factory mainly produces QT120, TY122, TY150 bulldozer series products. The oil leakage problem of the trolley wheel, carrier chain wheel and guide wheel in the trolley assembly has been difficult to solve properly, often in the vehicle assembly. After completion, it was found that there was leakage of oil in individual wheels. The main reason for this is the previously used “three-wheel” leak detection method (ie, injection of 15 MPa pressure in the “three-wheel” lubrication chamber).