１．进、退挡串油 经拆检变速器，发现离合器轴端旋转密封圈端面有非正常磨损，且集中在背离进油方向（见图１ａ）。分析认为，故障原因可能是：聚四氟乙烯材料抗磨损性能差；密封圈与离合器轴、油封盖配合过紧，在油压冲击下密封圈贴紧轴槽外端，使其与轴端面之间发生相对高速 1. In and out of the string of oil by the dismantling of the transmission and found that the clutch shaft rotating seal face abnormal wear, and focus away from the direction of the oil (see Figure 1a). Analysis, the cause of the malfunction may be: Teflon poor wear resistance; seal ring and clutch shaft, oil seal with the lid too tight, under the impact of oil pressure in the shaft seal groove close to the outer end, so that the shaft end face Relatively high speed occurred between