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在泵(beng)送(song)后停機(ji)(ji)再啟(qi)動(dong)(dong)(dong)時，電(dian)(dian)(dian)(dian)機(ji)(ji)不(bu)(bu)能(neng)啟(qi)動(dong)(dong)(dong)，聽聲音好象是(shi)動(dong)(dong)(dong)力不(bu)(bu)足，同(tong)時星形連(lian)接(jie)的電(dian)(dian)(dian)(dian)機(ji)(ji)電(dian)(dian)(dian)(dian)源(yuan)的交流繼電(dian)(dian)(dian)(dian)器(qi)“啪嗒啪嗒”不(bu)(bu)停地跳，懷疑(yi)是(shi)電(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)壓(ya)(ya)不(bu)(bu)足或者少相而造成的。經檢查，三(san)相電(dian)(dian)(dian)(dian)壓(ya)(ya)均非常(chang)(chang)穩定；當我們將交流繼電(dian)(dian)(dian)(dian)器(qi)換(huan)新后，繼電(dian)(dian)(dian)(dian)器(qi)不(bu)(bu)再跳動(dong)(dong)(dong)，但(dan)電(dian)(dian)(dian)(dian)機(ji)(ji)啟(qi)動(dong)(dong)(dong)聲音仍(reng)然異常(chang)(chang)；將電(dian)(dian)(dian)(dian)機(ji)(ji)電(dian)(dian)(dian)(dian)源(yuan)轉換(huan)為三(san)角形連(lian)接(jie)后，電(dian)(dian)(dian)(dian)機(ji)(ji)啟(qi)動(dong)(dong)(dong)聲音恢復了正(zheng)常(chang)(chang)，但(dan)機(ji)(ji)器(qi)主(zhu)(zhu)油路的壓(ya)(ya)力居高不(bu)(bu)下，而泵(beng)送(song)作業卻正(zheng)常(chang)(chang)，停止泵(beng)送(song)后，主(zhu)(zhu)油路的壓(ya)(ya)力還是(shi)居高不(bu)(bu)下，說明主(zhu)(zhu)泵(beng)未卸(xie)荷。由(you)此推測，電(dian)(dian)(dian)(dian)機(ji)(ji)啟(qi)動(dong)(dong)(dong)異常(chang)(chang)可能(neng)是(shi)因為電(dian)(dian)(dian)(dian)機(ji)(ji)帶(dai)負載啟(qi)動(dong)(dong)(dong)，故障(zhang)不(bu)(bu)在電(dian)(dian)(dian)(dian)器(qi)上。

電機啟動正常時，主(zhu)油路是不可能有壓力(li)的。若液(ye)壓油不清潔，主(zhu)油路電液(ye)換向閥被堵塞，會導致(zhi)(zhi)油路不通(tong)，致(zhi)(zhi)使電機帶負載啟動。

于是，將主油(you)路上(shang)的(de)電(dian)磁換(huan)向(xiang)(xiang)閥和液(ye)動換(huan)向(xiang)(xiang)閥分(fen)別拆下(xia)清洗，當(dang)打開液(ye)動換(huan)向(xiang)(xiang)閥時，發現閥腔內兩(liang)端的(de)回位(wei)彈(dan)簧(huang)中有一端的(de)彈(dan)簧(huang)已折斷(duan)(duan)了，使閥芯失去平衡，移向(xiang)(xiang)折斷(duan)(duan)彈(dan)簧(huang)的(de)那一端，從而(er)將換(huan)向(xiang)(xiang)閥的(de)T形(xing)堵死(si)，使液(ye)壓油(you)進入(ru)液(ye)動換(huan)向(xiang)(xiang)閥后不能同(tong)T形(xing)腔流回油(you)箱(xiang)，而(er)進入(ru)推送機(ji)(ji)構(gou)的(de)液(ye)壓缸中，致使主泵不能卸壓，造成電(dian)機(ji)(ji)帶負載啟(qi)動。換(huan)上(shang)新彈(dan)簧(huang)后，電(dian)機(ji)(ji)啟(qi)動正常，輸漿泵也工作正常。