拖拉机越冬过“三关”任东防冻关为了防止机车冻裂。从初冬直至初春，凡需长时间停车时都应放净冷却水。请注意以下几种冻裂拖拉机的情况：①冬季太阳暖融融时停车，不料入夜天气骤变，大风降温，祸及室外停放的拖拉机；②秋季农忙一过，机车就搁置不用了，也投放净冷却水... Tractor wintering over the “three” Ren Dong freeze-off in order to prevent locomotive cracking. From early winter until early spring, where long-term parking should be taken when the net cooling water. Please pay attention to the following situations of fissuring and tractor: ① When the winter sun is warm, stop the car, unexpectedly sudden changes in the weather, wind gusts, disasters and outdoor parked tractors; ② agricultural busy in autumn, the locomotive on hold aside, but also put a net cooling water...