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在泵送后(hou)停機(ji)(ji)(ji)再啟動(dong)(dong)時，電(dian)(dian)(dian)機(ji)(ji)(ji)不(bu)能啟動(dong)(dong)，聽聲(sheng)音好象是(shi)動(dong)(dong)力(li)不(bu)足(zu)，同時星形(xing)連接(jie)的(de)電(dian)(dian)(dian)機(ji)(ji)(ji)電(dian)(dian)(dian)源的(de)交(jiao)流繼電(dian)(dian)(dian)器“啪嗒啪嗒”不(bu)停地跳，懷疑是(shi)電(dian)(dian)(dian)源電(dian)(dian)(dian)壓(ya)不(bu)足(zu)或者少相而造(zao)成的(de)。經檢查，三(san)(san)相電(dian)(dian)(dian)壓(ya)均非常(chang)穩定；當(dang)我們將交(jiao)流繼電(dian)(dian)(dian)器換新后(hou)，繼電(dian)(dian)(dian)器不(bu)再跳動(dong)(dong)，但電(dian)(dian)(dian)機(ji)(ji)(ji)啟動(dong)(dong)聲(sheng)音仍然異常(chang)；將電(dian)(dian)(dian)機(ji)(ji)(ji)電(dian)(dian)(dian)源轉換為(wei)三(san)(san)角形(xing)連接(jie)后(hou)，電(dian)(dian)(dian)機(ji)(ji)(ji)啟動(dong)(dong)聲(sheng)音恢(hui)復(fu)了正(zheng)常(chang)，但機(ji)(ji)(ji)器主(zhu)(zhu)油(you)路的(de)壓(ya)力(li)居高(gao)不(bu)下，而泵送作業(ye)卻正(zheng)常(chang)，停止泵送后(hou)，主(zhu)(zhu)油(you)路的(de)壓(ya)力(li)還是(shi)居高(gao)不(bu)下，說明主(zhu)(zhu)泵未卸荷。由此推測，電(dian)(dian)(dian)機(ji)(ji)(ji)啟動(dong)(dong)異常(chang)可能是(shi)因為(wei)電(dian)(dian)(dian)機(ji)(ji)(ji)帶負載啟動(dong)(dong)，故障不(bu)在電(dian)(dian)(dian)器上(shang)。

電(dian)機啟動正(zheng)常時，主(zhu)油路(lu)(lu)是(shi)不(bu)可能(neng)有壓力的。若液壓油不(bu)清潔(jie)，主(zhu)油路(lu)(lu)電(dian)液換向(xiang)閥(fa)被(bei)堵塞(sai)，會導(dao)致油路(lu)(lu)不(bu)通，致使電(dian)機帶負載啟動。

于是，將(jiang)主油路上的(de)(de)電(dian)磁換(huan)向(xiang)閥(fa)和液(ye)動(dong)換(huan)向(xiang)閥(fa)分別(bie)拆下清洗，當打開液(ye)動(dong)換(huan)向(xiang)閥(fa)時，發現(xian)閥(fa)腔(qiang)內兩端的(de)(de)回位彈簧(huang)中(zhong)有(you)一端的(de)(de)彈簧(huang)已(yi)折斷了，使(shi)閥(fa)芯失去(qu)平(ping)衡，移向(xiang)折斷彈簧(huang)的(de)(de)那一端，從而(er)將(jiang)換(huan)向(xiang)閥(fa)的(de)(de)T形堵(du)死，使(shi)液(ye)壓油進(jin)入液(ye)動(dong)換(huan)向(xiang)閥(fa)后不(bu)能同T形腔(qiang)流回油箱，而(er)進(jin)入推送機(ji)構的(de)(de)液(ye)壓缸(gang)中(zhong)，致使(shi)主泵不(bu)能卸壓，造成(cheng)電(dian)機(ji)帶負載啟(qi)動(dong)。換(huan)上新(xin)彈簧(huang)后，電(dian)機(ji)啟(qi)動(dong)正(zheng)常(chang)，輸(shu)漿泵也(ye)工作正(zheng)常(chang)。