D80 A-12型推土机在长期工作后,常常出现制动踏板“反弹”(一侧或二侧)的现象,即在推土机急转弯而踩下脚踏板时,司机会感到脚踏板受力反应异常,且在放松脚踏板的时候,踏板会出现急速“反弹”并发生“打脚”的现象。应当注意,产生这种故障的原因并不是制动机构的毛病,而是由于最终传动中一级减速小齿轮轴5的外侧圆柱滚子轴承16(参阅附图)损坏的结果。在该轴承损坏的初期,脚踏板上的异常反应(反弹)较小,此时即应检查,并在必要时更换轴承。如果不能及 After long-term work on the D80 A-12 bulldozer, there is often a phenomenon that the brake pedal “bounces” (on one side or on both sides), that is, when the bulldozer makes a sharp turn and presses the foot pedal, the driver will feel an abnormal reaction of the foot pedal. And when the pedals are relaxed, the pedals will rapidly “bounce” and “foot-legged.” It should be noted that the cause of such failure is not the fault of the brake mechanism, but the result of the damage of the outer cylindrical roller bearing 16 (see the drawing) of the primary reduction pinion shaft 5 in the final drive. In the initial stage of the bearing damage, the abnormal reaction (bounce) on the footboard is small. At this time, it should be checked and replaced if necessary. If not