一、小四轮拖拉机变速箱内异响的原因一些小四轮拖拉机在工作中由变速箱内发出一种不间断的杂声。其主要原因是:变速箱内缺油或齿轮油粘度不够,润滑条件恶化;齿轮内花键磨损,配合间隙增加,传动时发出不正常的响声;因使用时间过久或缺油润滑,造成轴承磨损,工作中轴或齿轮产生轴向和径向窜动,发出冲击或咬齿的杂声; First, the small four-wheel tractor transmission of abnormal sound reasons Some small four-wheel tractor in the work sent by the transmission of an uninterrupted noise. The main reason is: lack of gearbox or gear oil viscosity is not enough, the deterioration of lubrication conditions; gear spline wear, increase with the gap, transmission abnormal noise; due to the use of time or lack of lubrication, resulting in bearings Wear, work axis or gear produce axial and radial movement, issued a shock or bite noise;