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在(zai)泵送后(hou)停機(ji)再啟動(dong)(dong)時(shi)，電(dian)(dian)(dian)(dian)(dian)機(ji)不(bu)(bu)(bu)能啟動(dong)(dong)，聽聲音好象(xiang)是(shi)(shi)(shi)動(dong)(dong)力不(bu)(bu)(bu)足，同時(shi)星形連接(jie)的(de)電(dian)(dian)(dian)(dian)(dian)機(ji)電(dian)(dian)(dian)(dian)(dian)源的(de)交(jiao)流繼電(dian)(dian)(dian)(dian)(dian)器(qi)“啪嗒(da)啪嗒(da)”不(bu)(bu)(bu)停地(di)跳，懷疑(yi)是(shi)(shi)(shi)電(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)不(bu)(bu)(bu)足或者少相而造成的(de)。經檢查，三(san)相電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)(ya)均(jun)非常穩定；當我(wo)們(men)將(jiang)交(jiao)流繼電(dian)(dian)(dian)(dian)(dian)器(qi)換新后(hou)，繼電(dian)(dian)(dian)(dian)(dian)器(qi)不(bu)(bu)(bu)再跳動(dong)(dong)，但(dan)電(dian)(dian)(dian)(dian)(dian)機(ji)啟動(dong)(dong)聲音仍(reng)然異(yi)常；將(jiang)電(dian)(dian)(dian)(dian)(dian)機(ji)電(dian)(dian)(dian)(dian)(dian)源轉換為(wei)三(san)角(jiao)形連接(jie)后(hou)，電(dian)(dian)(dian)(dian)(dian)機(ji)啟動(dong)(dong)聲音恢(hui)復了正(zheng)常，但(dan)機(ji)器(qi)主油路的(de)壓(ya)(ya)(ya)力居高不(bu)(bu)(bu)下，而泵送作業卻正(zheng)常，停止泵送后(hou)，主油路的(de)壓(ya)(ya)(ya)力還是(shi)(shi)(shi)居高不(bu)(bu)(bu)下，說明主泵未卸(xie)荷。由此(ci)推測，電(dian)(dian)(dian)(dian)(dian)機(ji)啟動(dong)(dong)異(yi)常可能是(shi)(shi)(shi)因為(wei)電(dian)(dian)(dian)(dian)(dian)機(ji)帶負載啟動(dong)(dong)，故障不(bu)(bu)(bu)在(zai)電(dian)(dian)(dian)(dian)(dian)器(qi)上(shang)。

電機啟動(dong)正(zheng)常時，主油路(lu)是不(bu)可(ke)能有壓力的。若液(ye)壓油不(bu)清潔，主油路(lu)電液(ye)換向閥被堵塞，會導致油路(lu)不(bu)通，致使電機帶負載(zai)啟動(dong)。

于是(shi)，將主油(you)(you)路上(shang)的(de)(de)電(dian)磁換(huan)(huan)向閥(fa)(fa)(fa)(fa)和液(ye)動換(huan)(huan)向閥(fa)(fa)(fa)(fa)分別(bie)拆(chai)下清洗，當打開液(ye)動換(huan)(huan)向閥(fa)(fa)(fa)(fa)時，發現閥(fa)(fa)(fa)(fa)腔(qiang)內兩端(duan)(duan)的(de)(de)回位彈簧中有一端(duan)(duan)的(de)(de)彈簧已(yi)折(zhe)斷了(le)，使(shi)閥(fa)(fa)(fa)(fa)芯(xin)失去平衡，移(yi)向折(zhe)斷彈簧的(de)(de)那一端(duan)(duan)，從而(er)將換(huan)(huan)向閥(fa)(fa)(fa)(fa)的(de)(de)T形(xing)堵死，使(shi)液(ye)壓油(you)(you)進入(ru)液(ye)動換(huan)(huan)向閥(fa)(fa)(fa)(fa)后不能同T形(xing)腔(qiang)流回油(you)(you)箱，而(er)進入(ru)推送(song)機(ji)構的(de)(de)液(ye)壓缸(gang)中，致使(shi)主泵不能卸壓，造成電(dian)機(ji)帶負載(zai)啟(qi)動。換(huan)(huan)上(shang)新(xin)彈簧后，電(dian)機(ji)啟(qi)動正常(chang)，輸漿(jiang)泵也工作(zuo)正常(chang)。