冬季，拖拉机要把好以下“三关”。一、防冻并每年入冬后，各地冻坏的拖拉机事故发生率频繁。其原因：①刚入冬天气还不算很冷，驾驶员停车后未放掉冷却水。此时如果气候骤变，夜间偶尔遭受大风降温和霜冻，在OC以下，冷却水就会结冰，将机体冻裂。②在天暖时未放尽冷却水，机? In winter, the tractor should take the following three levels. First, antifreeze and winter each year, frozen tractor accidents around the frequent occurrence. The reason: ① just winter into the gas is not too cold, the driver did not let go after cooling water cooling. At this time if the climate changes suddenly occasionally suffer wind gale and frost at night, below the OC, the cooling water will freeze, the body cracked. ② in the warm days did not give up cooling water, machine?