农用运输车变速器常见故障有跳档、乱档、挂档困难、异响及漏油等。现将其故障的诊断分述如下。１跳档（脱档）跳档是指变速器挂某一档时 ,滑动齿轮脱离啮合位置 ,变速杆自动跳回原来位置。其诊断过程如下 :１ １拆下变速器盖 ,检视齿轮啮合端是否磨成锥形 ,齿轮与花键是否磨损 Agricultural transmission common faults are jump files, mess files, hanging files difficult, abnormal sound and oil spills. Now the diagnosis of its failure are as follows. 1-speed gear (off-shift) When a gear is engaged, a gear is released from the engaged position and the shift lever automatically jumps back to its original position. The diagnostic procedure is as follows: 1 1 Remove the transmission cover and view if the meshing end of the gear is tapered and the gear and spline wear out