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三民(min)的(de)混(hun)凝土輸送泵在(zai)啟(qi)(qi)動時的(de)故障(zhang)是主電機啟(qi)(qi)動不轉，且(qie)伴有嗡(weng)嗡(weng)聲，一(yi)般為電源(yuan)缺相導致的(de)。

有(you)兩方面原因，一是(shi)終(zhong)端(duan)繼電(dian)(dian)器，故(gu)障一般為線(xian)圈燒(shao)壞或(huo)觸點燒(shao)壞，使其觸點不(bu)能正常(chang)閉(bi)合，脫開(kai)。二(er)是(shi)電(dian)(dian)磁鐵(tie)(tie)，三民混(hun)凝土(tu)輸(shu)送泵有(you)二(er)個電(dian)(dian)磁鐵(tie)(tie)，電(dian)(dian)液換向閥上兩電(dian)(dian)磁鐵(tie)(tie)YV1、YV2控(kong)制(zhi)泵機的(de)正反泵，其故(gu)障判(pan)定(ding)方法如下：接通(tong)控(kong)制(zhi)電(dian)(dian)源，取掉電(dian)(dian)磁鐵(tie)(tie)端(duan)部(bu)的(de)橡皮套，用(yong)手將電(dian)(dian)磁鐵(tie)(tie)芯向里推，然后旋(xuan)轉(zhuan)對應(ying)的(de)操(cao)作按(an)鈕，說明該電(dian)(dian)磁鐵(tie)(tie)對面的(de)電(dian)(dian)磁鐵(tie)(tie)燒(shao)壞，或(huo)是(shi)旋(xuan)轉(zhuan)點動按(an)鈕對應(ying)的(de)電(dian)(dian)磁鐵(tie)(tie)就有(you)響聲。