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福州青州集装箱码头有限公司的1 7台Magnum TT120型牵引车用的是美国通用Allison MT643型变速器,使用4年后,变矩器前盖的6个闭锁活塞的定位螺钉部分或全部地断裂,且多发生在缩颈处(见图1)。
Seventeen Magnum TT120 tractors used by Fuzhou Qingzhou Container Terminal Co., Ltd. used a Universal Allison MT643 transmission of the United States. After four years, the set screws of the six locking pistons of the front cover of the torque converter were partially or completely broken and Occurred at the neck (see Figure 1).