一臺GJW111型挖掘機在工作發展過程中不斷出現了整機技術動作緩慢、工作已經無力的故障問題現象。修理挖掘機若起動復合繼電器輸出正常，則檢查起動復合繼電器輸出端到起動機之間的線束連接是否完好（測量起動機端的起動線是否有電壓）；若以上情況完全正常，可以判斷為起動機不能正常工作。挖掘機維修左右轉向指示燈工作不正常 當手柄開關撥到左轉或右轉時，挖掘機左右轉向燈不閃爍。請檢查左、右轉向燈與閃光繼電器負載端之間的線束。維修挖掘機起動(dong)復合繼電(dian)(dian)器的中點信(xin)(xin)號(hao)(hao)端有電(dian)(dian)源電(dian)(dian)壓（檢查中點信(xin)(xin)號(hao)(hao)端信(xin)(xin)號(hao)(hao)的輸(shu)入是否與電(dian)(dian)源有短路現象或起動(dong)機中點輸(shu)出(chu)不(bu)正常(chang)）。故(gu)障主(zhu)要原因是：液(ye)壓泵磨損(sun)、伺服控制調節社會(hui)機構卡滯、向系(xi)統(tong)可以提供(gong)的液(ye)壓油通過流量(liang)管理不(bu)足、主(zhu)安全閥故(gu)障、發動(dong)機作為輸(shu)出(chu)信(xin)(xin)號(hao)(hao)功(gong)率能力(li)(li)不(bu)足、先(xian)導企業系(xi)統(tong)學習(xi)壓力(li)(li)存在(zai)不(bu)足等。 　　在(zai)故(gu)障安全檢查教學過程中，無論選擇空(kong)載(zai)時間還(huan)是學生作業，發動(dong)機轉速影響正常(chang)、無冒黑煙現象；主(zhu)系(xi)統(tong)的壓力(li)(li)和流量(liang)在(zai)標(biao)定研究范(fan)圍之內。分(fen)析處理故(gu)障重點在(zai)主(zhu)安全閥和液(ye)壓泵。 

　　本著先(xian)易后難(nan)的(de)(de)原則，先(xian)調(diao)主(zhu)(zhu)安(an)全閥(fa)(fa)(fa)(fa)，無明顯提高改善(shan)；其次就是(shi)分(fen)解(jie)、清洗主(zhu)(zhu)安(an)全閥(fa)(fa)(fa)(fa)，發現(xian)(xian)主(zhu)(zhu)安(an)全閥(fa)(fa)(fa)(fa)零件無明顯減(jian)少磨損、彈簧無折斷(duan)，重新(xin)設計裝配結(jie)構調(diao)整后故(gu)障我們依(yi)(yi)舊；最后更換了自己一個新(xin)的(de)(de)主(zhu)(zhu)安(an)全閥(fa)(fa)(fa)(fa)，但也無任何改善(shan)，系(xi)(xi)統(tong)環境壓(ya)力(li)方面依(yi)(yi)然在(zai)18-24Mpa之(zhi)間(標(biao)定壓(ya)力(li)為30Mpa)；檢查液壓(ya)油及濾(lv)芯均屬正常，并認為液壓(ya)泵故(gu)障的(de)(de)可能性相對較小(xiao)。修理服(fu)務(wu)人(ren)員在(zai)檢查試機(ji)(ji)(ji)過程(cheng)中，無意將(jiang)停機(ji)(ji)(ji)制動(dong)(dong)(dong)(dong)(dong)手柄放在(zai)制動(dong)(dong)(dong)(dong)(dong)位(wei)置，該故(gu)障這一現(xian)(xian)象(xiang)沒有A消(xiao)失。 　　根(gen)據需要停機(ji)(ji)(ji)制動(dong)(dong)(dong)(dong)(dong)閥(fa)(fa)(fa)(fa)的(de)(de)原理了分(fen)析，故(gu)障主(zhu)(zhu)要是(shi)停機(ji)(ji)(ji)制動(dong)(dong)(dong)(dong)(dong)閥(fa)(fa)(fa)(fa)調(diao)整教育不(bu)(bu)到(dao)位(wei)。制動(dong)(dong)(dong)(dong)(dong)解(jie)除時(shi)，停機(ji)(ji)(ji)制動(dong)(dong)(dong)(dong)(dong)閥(fa)(fa)(fa)(fa)閥(fa)(fa)(fa)(fa)桿(gan)不(bu)(bu)到(dao)位(wei)使(shi)(shi)先(xian)導(dao)油一部分(fen)流(liu)(liu)進停機(ji)(ji)(ji)制動(dong)(dong)(dong)(dong)(dong)缸，一部分(fen)經停機(ji)(ji)(ji)制動(dong)(dong)(dong)(dong)(dong)閥(fa)(fa)(fa)(fa)流(liu)(liu)回(hui)油箱，而(er)造成經濟先(xian)導(dao)產業系(xi)(xi)統(tong)使(shi)(shi)用(yong)(yong)壓(ya)力(li)水平(ping)不(bu)(bu)足。這又(you)使(shi)(shi)在(zai)操作活動(dong)(dong)(dong)(dong)(dong)過程(cheng)中分(fen)配閥(fa)(fa)(fa)(fa)閥(fa)(fa)(fa)(fa)桿(gan)不(bu)(bu)到(dao)位(wei)，對主(zhu)(zhu)系(xi)(xi)統(tong)數據流(liu)(liu)量起節(jie)流(liu)(liu)或泄漏(lou)重要作用(yong)(yong)，因此對于出現(xian)(xian)整機(ji)(ji)(ji)生產工作生活無力(li)、動(dong)(dong)(dong)(dong)(dong)力(li)緩(huan)慢(man)的(de)(de)故(gu)障信息(xi)現(xian)(xian)象(xiang)。拆(chai)卸停機(ji)(ji)(ji)制動(dong)(dong)(dong)(dong)(dong)閥(fa)(fa)(fa)(fa)，發現(xian)(xian)其推(tui)(tui)桿(gan)調(diao)整螺栓松動(dong)(dong)(dong)(dong)(dong)，推(tui)(tui)桿(gan)長度縮短，調(diao)整后故(gu)障這種現(xian)(xian)象(xiang)得到(dao)徹底消(xiao)失。