一台ＺＬ５０装载机大修后不久，又出现了变速箱温度过高的现象，即该机工作约１ｈ后，变速箱壳体冒热气，用手根本无法触及壳体。根据以上情况，我们进行如下分析和诊断。由变矩器和变速箱工作原理可知，造成变速箱温度过高的原因主要有以下几点：（１）变速箱油位过低或过高 Shortly after the overhaul of a ZL50 loader, there was a phenomenon that the temperature of the gearbox was too high, that is, after about 1 hour of operation, the gearbox case was heated and could not reach the shell by hand. Based on the above, we carry out the following analysis and diagnosis. By the torque converter and transmission principle shows that the main cause of the gearbox temperature are the following: (1) Transmission oil level is too low or too high