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我场一丰收-3.0型自走式联合收割机在夏收作业中,突然出现下述异常现象:发动机(4115 L_1)中低速运转时,冷却水温正常;高速运转时,出现冷却水温骤然升高甚至开锅的反常现象。起初怀疑是碎麦杆和灰尘填塞了水箱散热片,引起通风不良,失去冷却效果。但经用高压水冲洗水箱后,堵塞部分疏通了,故障依旧。进一步检查发现,发动机高速运转时,水泵出水量小,当时判断为水泵叶轮与泵体之间的间隙过大,致使冷却水量少。不能充分冷却高速运转、满负荷工作的发动机,进而使冷却水温骤升。但经仔细检查后表明,出水量少的原因并不在水泵,剩
My field a harvest -3.0 type self-propelled combine harvester in the summer harvest operation, the following sudden anomalies: the engine (4115 L_1) low speed operation, the cooling water temperature is normal; high-speed operation, the cooling water temperature suddenly increased or even Unusual phenomenon of boiling pot. At first it was suspected that broken straw and dust filled the tank heat sink, causing poor ventilation and losing the cooling effect. However, after flushing the water tank with high-pressure water, the blockage is partially cleared and the fault still remains. Further examination found that the engine high speed operation, the pump water is small, was judged as the pump impeller and the gap between the pump is too large, resulting in less cooling water. Can not fully cool high-speed operation, full-load engine, so that the cooling water temperature rise. However, after careful examination showed that the reasons for less water is not the pump, left