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QT１２０－６型推土机在恶劣工况进行作业时，履带张紧装置的张紧杆曾出现程度不同的变形问题。如图１所示，履带张紧装置由缓冲弹簧１、张紧杆２、张紧液压缸９和活塞８等组成。改变张紧液压缸中的充油量，即可调节履带的松紧程度。缓冲弹簧的作用，一是保证适当的履带张紧力
QT120-6 bulldozers operating in harsh conditions, the tensioner tensioning device has been a different degree of deformation problems. As shown in FIG. 1, the track tensioning device is composed of a buffer spring 1, a tension rod 2, a tension cylinder 9 and a piston 8. Change the tension in the hydraulic cylinder filling, you can adjust the tightness of the track. The role of buffer spring, first, to ensure proper track tension