(1)閥(fa)芯卡(ka)(ka)住或(huo)(huo)(huo)(huo)(huo)閥(fa)孔(kong)堵(du)(du)(du)塞。當流量閥(fa)或(huo)(huo)(huo)(huo)(huo)方向(xiang)閥(fa)閥(fa)芯卡(ka)(ka)住或(huo)(huo)(huo)(huo)(huo)閥(fa)孔(kong)堵(du)(du)(du)塞時(shi)，液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)缸(gang)易發生誤動作(zuo)或(huo)(huo)(huo)(huo)(huo)動作(zuo)失靈。此(ci)時(shi)應(ying)(ying)(ying)檢(jian)(jian)查(cha)(cha)油(you)(you)(you)液(ye)的污染(ran)情(qing)況；檢(jian)(jian)查(cha)(cha)臟(zang)物(wu)或(huo)(huo)(huo)(huo)(huo)膠質沉(chen)淀物(wu)是(shi)(shi)(shi)(shi)否(fou)卡(ka)(ka)住閥(fa)芯或(huo)(huo)(huo)(huo)(huo)堵(du)(du)(du)塞閥(fa)孔(kong)；檢(jian)(jian)查(cha)(cha)閥(fa)體的磨損情(qing)況，清洗(xi)、更換系統(tong)(tong)過濾器(qi)，清洗(xi)油(you)(you)(you)箱(xiang)，更換液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)介質。(2)活(huo)塞桿(gan)與缸(gang)筒卡(ka)(ka)住或(huo)(huo)(huo)(huo)(huo)液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)缸(gang)堵(du)(du)(du)塞。此(ci)時(shi)無論如(ru)何操(cao)縱(zong)，液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)缸(gang)都不(bu)動作(zuo)或(huo)(huo)(huo)(huo)(huo)動作(zuo)甚微(wei)。這時(shi)應(ying)(ying)(ying)檢(jian)(jian)查(cha)(cha)活(huo)塞及活(huo)塞桿(gan)密封(feng)是(shi)(shi)(shi)(shi)否(fou)太(tai)緊，是(shi)(shi)(shi)(shi)否(fou)進(jin)入臟(zang)物(wu)及膠質沉(chen)淀物(wu)：活(huo)塞桿(gan)與缸(gang)筒的軸心線是(shi)(shi)(shi)(shi)否(fou)對(dui)中，易損件和密封(feng)件是(shi)(shi)(shi)(shi)否(fou)失效，所帶負荷(he)是(shi)(shi)(shi)(shi)否(fou)太(tai)大。(3)液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)系統(tong)(tong)控(kong)(kong)制(zhi)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)太(tai)低。控(kong)(kong)制(zhi)管(guan)(guan)路中節流阻(zu)力(li)可(ke)能(neng)過大，流量閥(fa)調節不(bu)當，控(kong)(kong)制(zhi)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)不(bu)合適，壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)源受到干擾。此(ci)時(shi)應(ying)(ying)(ying)檢(jian)(jian)查(cha)(cha)控(kong)(kong)制(zhi)壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)源，保(bao)證壓(ya)(ya)(ya)(ya)(ya)(ya)力(li)調節到系統(tong)(tong)的規定(ding)值(zhi)。(4)液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)系統(tong)(tong)中進(jin)入空(kong)氣。主要是(shi)(shi)(shi)(shi)因為系統(tong)(tong)中有泄漏發生。此(ci)時(shi)應(ying)(ying)(ying)檢(jian)(jian)查(cha)(cha)液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)油(you)(you)(you)箱(xiang)的液(ye)位(wei)，液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)泵(beng)吸油(you)(you)(you)側的密封(feng)件和管(guan)(guan)接頭(tou)，吸油(you)(you)(you)粗(cu)(cu)濾器(qi)是(shi)(shi)(shi)(shi)否(fou)太(tai)臟(zang)。若如(ru)此(ci)，應(ying)(ying)(ying)補充液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)油(you)(you)(you)，處(chu)理密封(feng)及管(guan)(guan)接頭(tou)，清洗(xi)或(huo)(huo)(huo)(huo)(huo)更換粗(cu)(cu)濾芯。(5)液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)缸(gang)初始動作(zuo)緩慢(man)。在溫(wen)度較低的情(qing)況下(xia)，液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)油(you)(you)(you)黏(nian)度大，流動性差，導致液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)缸(gang)動作(zuo)緩慢(man)。改善方法是(shi)(shi)(shi)(shi)，更換黏(nian)溫(wen)性能(neng)較好的液(ye)壓(ya)(ya)(ya)(ya)(ya)(ya)油(you)(you)(you)，在低溫(wen)下(xia)可(ke)借助加熱器(qi)或(huo)(huo)(huo)(huo)(huo)用機器(qi)自身加熱以(yi)提升啟動時(shi)的油(you)(you)(you)溫(wen)，系統(tong)(tong)正常工作(zuo)油(you)(you)(you)溫(wen)應(ying)(ying)(ying)保(bao)持(chi)在40℃左右。