对于一(yi)(yi)台液压挖掘(jue)机来(lai)说，好(hao)比(bi)一(yi)(yi)个人，液压油(you)就像是浑身(shen)流动的血液，是挖掘(jue)机的生命线。

因此，工(gong)(gong)(gong)程机械液压(ya)(ya)油(you)清洁度的好坏将(jiang)(jiang)直(zhi)接影响到液压(ya)(ya)系统工(gong)(gong)(gong)作的可靠(kao)性及使用寿(shou)命(ming)，液压(ya)(ya)油(you)清洁度无法得到保(bao)证(zheng)，将(jiang)(jiang)会加(jia)速泵、阀、油(you)缸、马达等工(gong)(gong)(gong)作元件(jian)的磨损，同时(shi)液压(ya)(ya)系统还将(jiang)(jiang)产生一些(xie)显(xian)性或隐性故(gu)障。

针对液压油(you)清洁度话题，以下实(shi)际案例供各位用户(hu)朋友们一起探讨交流。

故障现象：某用户(hu)陈某，拥有一台(tai)厦工(gong)XG822EL挖掘机。机器(qi)工(gong)作1300余小(xiao)时(shi)(shi)，用户(hu)反(fan)(fan)应(ying)机器(qi)正常(chang)工(gong)作装置(zhi)工(gong)作时(shi)(shi)或(huo)行(xing)走时(shi)(shi)一切正常(chang)，同时(shi)(shi)行(xing)走加(jia)抬(tai)动(dong)臂时(shi)(shi)，小(xiao)油(you)门抬(tai)动(dong)臂时(shi)(shi)（斗(dou)杆及铲(chan)斗(dou)）无(wu)任(ren)何(he)反(fan)(fan)应(ying)，大油(you)门时(shi)(shi)动(dong)臂抬(tai)起(qi)非常(chang)慢（接近爬(pa)行(xing)状态）。

故障检测(ce)分析(xi)与处理：经测(ce)量先(xian)导(dao)压(ya)力为40kg.f/cm2,,动(dong)臂及铲斗的二次先(xian)导(dao)压(ya)力为35－38kg.f/cm2左右(you)，测(ce)量主工作压(ya)力均为320kg.f/cm2,拆解直(zhi)线行走(zou)阀及均正常无卡涉现(xian)象(xiang)，并分解直(zhi)线行走(zou)阀内部(bu)单(dan)向阀及弹簧完(wan)好，无明显磨损及拉伤现(xian)象(xiang)，清(qing)洗(xi)后进(jin)行装回。

根据液压(ya)(ya)原理图油(you)路分析，直线(xian)行(xing)(xing)走(zou)阀(fa)(fa)阀(fa)(fa)杆工(gong)作(zuo)时必须为(wei)左右行(xing)(xing)走(zou)+工(gong)作(zuo)装置(zhi)（动(dong)臂、斗(dou)杆、铲斗(dou)、回(hui)转及备用）任(ren)意(yi)一组阀(fa)(fa)杆产生(sheng)位移便可(ke)建立起油(you)压(ya)(ya)，使直线(xian)行(xing)(xing)走(zou)阀(fa)(fa)将被(bei)激活换(huan)向位移，在(zai)多路阀(fa)(fa)直线(xian)行(xing)(xing)走(zou)阀(fa)(fa)信(xin)(xin)号油(you)口接上三通(tong)测量压(ya)(ya)约为(wei)38kg.f/cm2。油(you)压(ya)(ya)正常。后(hou)将该(gai)信(xin)(xin)号油(you)PG口接头拆(chai)除发现，该(gai)信(xin)(xin)号油(you)进(jin)入(ru)直线(xian)行(xing)(xing)走(zou)阀(fa)(fa)的接头口大部(bu)分被(bei)如(ru)黑色橡胶类异(yi)(yi)物堵住，异(yi)(yi)物位于滤(lv)网中无法(fa)清理，只(zhi)能更换(huan)，因现场无新(xin)接头，先将头部(bu)用手(shou)电钻钻通(tong)。清理干净，装回(hui)车上后(hou)，试(shi)车恢复正常，同时行(xing)(xing)走(zou)+工(gong)作(zuo)装置(zhi)时，工(gong)作(zuo)装置(zhi)可(ke)正常动(dong)作(zuo)。

现场用(yong)(yong)(yong)(yong)户试车对处理结果(guo)表(biao)示满(man)意，后与用(yong)(yong)(yong)(yong)户交(jiao)谈(tan)中(zhong)得知(zhi)，该(gai)机用(yong)(yong)(yong)(yong)户有(you)(you)一段时间加装(zhuang)使用(yong)(yong)(yong)(yong)破(po)(po)碎锤，工作期间有(you)(you)一次破(po)(po)碎油(you)管管被大石块碰坏，用(yong)(yong)(yong)(yong)户自行在(zai)外(wai)扣(kou)压一根高压油(you)管装(zhuang)上，当(dang)询问用(yong)(yong)(yong)(yong)户是否有(you)(you)清(qing)理油(you)管，用(yong)(yong)(yong)(yong)户称(cheng)切管的用(yong)(yong)(yong)(yong)嘴吹(chui)(chui)了吹(chui)(chui)管两(liang)头，扣(kou)压完拿回(hui)来直接装(zhuang)上车。

小(xiao)结：该起故障由于异物进入液压系(xi)统(tong)中造成(cheng)液压油被污染(ran)，造成(cheng)的液压系(xi)统(tong)故障，在此同用户(hu)沟通注重(zhong)机器保养(yang)，并推荐使用厦(sha)工原厂配(pei)件及(ji)专用油及(ji)按规(gui)定(ding)进行维护保养(yang)。

接头两面均大部分堵塞