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1、《挖掘机发动机异响维修手册》《挖掘机发动机异响维修手册》·····································································································1第一章是什么原因？·······································································································1第二章该怎么办？······································
2、·····································································2第三章真实维修案例·······································································································2维修案例一·····································································································
3、····················3维修案例二·························································································································4第四章维修流程···············································································································5第五章维修范围···············
4、······························································································6第一章是什么原因？故障现象：1发动机怠速或者是低速运转时异响。2在某个转速的突然出现发动机异响。3在发动机急加速的时候出现异响。4在发动机某缸断火时出现异响,过一会就没了。5在发动机某一个缸断火时出现异响,但是异响声越来越大。6发动机相邻的两个缸之间断火,出现发动机异响。7低温异响,温度升高后异响逐渐消失。8高温异响,随着温度降低异响消失。原因维修效果图1发动机的活塞与气缸壁之间的间隙
5、过大,或者是活塞销装配过紧,或者是发动机挺杆与导孔之间的间隙过大等等.2发动机曲轴折断,活塞销衬套松旷,或者是由于发动机的凸轮轴正时齿轮破裂或其固定螺母松动造成的.3连杆轴承松旷,轴瓦烧熔或尺寸不符而转动,曲轴轴承松旷或轴瓦烧容,活塞销折断,曲轴折断等等.4于发动机活塞敲缸,或者是由于连杆轴承松了,还有可能是活塞环漏气了等.5活塞销铜套松旷,活塞裙部锥度过大,活塞销窜出,连杆轴承盖固定螺栓松动过甚或连杆轴瓦合金烧熔脱净等等.6曲轴轴承松旷了.7活塞与缸壁之间的间隙太大,或者是发动机机油压力低润滑不好.8发动机活塞变形了,或者是活塞环的间隙太小了,还有可能是过热引起的早燃等
6、原因.第二章该怎么办？①发动机曲轴异响,发动机振动:曲轴轴向间隙过大导致异响,重新选配轴承更换,异响排除.②主轴承异响,发动机振动:主轴颈与轴承配合松旷、主轴承润滑不良而烧坏、曲轴弯曲或轴向间隙大.③发动机怠速异响,低中速铛铛响:润滑不良或轴承配合不当、轴承质量不佳或装配间隙过松、过紧迫使轴承片变形而造成合金脱落、连杆轴颈失圆,与轴承接触不良.③挖掘机正时齿轮异响:正时齿轮磨损或装配不当,使啮合间隙过大或过小、曲轴和凸轮轴中心线不平行、凸轮轴正时齿轮松动或润滑不良、凸轮轴正时齿轮轮齿折断或齿轮径向破裂.④发动机怠速响声大,凸轮轴异响:凸轮轴轴向间隙过大或凸轮轴松动.⑤发动
7、机气门脚异响:气门传动机构的零件磨损或调整不当,气门间隙过大、气门传动机构缺少润滑.⑥发动机哒哒响,液压挺柱异响:发动机机油油面过高或过低、液压挺柱中缺少润滑油、液压挺柱失效.第三章真实维修案例以下是美瑞特挖机维修厂近期部分挖掘机发动机异响维修案例一览表：资深维修师李师傅维修交流136-35478070故障机型故障表现维修地点维修单位卡特312C挖掘机发动机异响宁夏美瑞特挖掘机维修厂卡特345D挖掘机发动机异响甘肃美瑞特挖掘机维修厂卡特312D挖掘机发动机异响青海美瑞特挖掘机维修厂卡特320D挖掘机发动机异响重庆美瑞特挖掘机维
