堵：一般低压油路易被杂质堵塞，常见为进油滤网堵塞，造成农机具不能升起或提升缓慢。原因主要有两条：一是液压系统与变速箱共用齿轮油，油液易脏得，有磨屑使滤网堵塞。二是油液因齿轮啮会挤压或液压系统产生高压高温，使油液变质、胶化而堵塞。后者常表现为冷车提升缓慢，? Blocking: General low-pressure oil easily blocked by impurities, common into the filter plugging, causing agricultural machinery can not be raised or slow to enhance. There are two main reasons: First, the hydraulic system and gearbox gear oil sharing, easy to dirty oil, wear debris to filter clogging. Second, the oil will be squeezed by the gear or hydraulic system will produce high pressure and temperature, the oil metamorphic, gelled and blocked. The latter often show a slow increase of cold cars ,?