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履带式东方红拖拉机用的4125A型发动机,以前在设计上可能只考虑95％以上的工作时间是在农田平坦的场地行走作业,因此发动机的曲轴轴向限位只利用曲轴上第五道主轴瓦的凸肩或止推片来限位。限制曲轴的轴向窜动才能保证曲柄连杆机构的正确位置,但当曲轴受热膨胀时还应允许它能自由伸长。而随着市场的发展,履带式东方红拖拉机大量用于水利战线上,与液压式铲运机相配套,在不平坦的施工场地行走作业,大约有30％～50％的工作时间是在上坡或下坡行走作业。而在上、下坡时发动机的飞轮、曲轴和连杆的重量的分力会产生曲轴第五道主
4125A crawler type Dongfanghong tractor engine used to be designed in the past may consider only 95% of the working time is flat field farmland operations, so the engine crankshaft axial limit only use the fifth spindle on the crankshaft The shoulder or thrust piece to limit. Limiting the axial play of the crankshaft ensures the correct position of the crank-and-rod mechanism, but it should also allow it to extend freely when it is heated. With the development of the market, large numbers of crawler type Dongfanghong tractors are used on the water front, and are matched with hydraulic scrapers to work on uneven construction sites. About 30% ~ 50% of the working hours are on Slope or downhill homework. In the up and downhill engine flywheel, crankshaft and connecting rod weight of the force will have the fifth main crankshaft