2、液(ye)(ye)(ye)(ye)壓(ya)油(you)(you)(you)(you)油(you)(you)(you)(you)溫(wen)異(yi)常升高(gao)液(ye)(ye)(ye)(ye)壓(ya)油(you)(you)(you)(you)油(you)(you)(you)(you)溫(wen)異(yi)常升高(gao)的(de)根本原因(yin)(yin)有以下3個(ge)方面(mian)：一是(shi)由于安全閥(fa)壓(ya)力設(she)定值太低(di)，使液(ye)(ye)(ye)(ye)壓(ya)油(you)(you)(you)(you)大(da)部分通(tong)過(guo)(guo)安全閥(fa)流回(hui)油(you)(you)(you)(you)箱，附(fu)近(jin)賣(mai)液(ye)(ye)(ye)(ye)壓(ya)油(you)(you)(you)(you)的(de)，致(zhi)使液(ye)(ye)(ye)(ye)壓(ya)系統做功效率太低(di)，如(ru)負荷過(guo)(guo)大(da)，大(da)部分能(neng)量會轉換成(cheng)(cheng)液(ye)(ye)(ye)(ye)壓(ya)油(you)(you)(you)(you)的(de)熱能(neng)，導(dao)(dao)致(zhi)溫(wen)度(du)很高(gao)：二是(shi)由于冷(leng)卻系的(de)冷(leng)卻效果差，導(dao)(dao)致(zhi)液(ye)(ye)(ye)(ye)壓(ya)油(you)(you)(you)(you)溫(wen)度(du)過(guo)(guo)高(gao);三是(shi)液(ye)(ye)(ye)(ye)壓(ya)油(you)(you)(you)(you)在油(you)(you)(you)(you)路中循環過(guo)(guo)于頻繁(往(wang)往(wang)是(shi)油(you)(you)(you)(you)量不(bu)足造成(cheng)(cheng))，導(dao)(dao)致(zhi)散熱困難，溫(wen)度(du)升高(gao)。3、液(ye)(ye)(ye)(ye)壓(ya)油(you)(you)(you)(you)過(guo)(guo)臟液(ye)(ye)(ye)(ye)壓(ya)油(you)(you)(you)(you)污濁、過(guo)(guo)臟，可(ke)(ke)能(neng)是(shi)油(you)(you)(you)(you)液(ye)(ye)(ye)(ye)因(yin)(yin)長期使用產生(sheng)了(le)化學變(bian)化;也可(ke)(ke)能(neng)是(shi)雜質太多發(fa)生(sheng)了(le)物理變(bian)化。只要(yao)找到造成(cheng)(cheng)這2種變(bian)化的(de)原因(yin)(yin)，即可(ke)(ke)采取(qu)相(xiang)應措施。

選(xuan)擇合適(shi)粘(zhan)度(du)(du)液(ye)壓(ya)(ya)(ya)(ya)(ya)油。溫(wen)(wen)度(du)(du)高(gao)和(he)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)高(gao)的(de)系(xi)(xi)統要選(xuan)用粘(zhan)度(du)(du)較高(gao)的(de)液(ye)壓(ya)(ya)(ya)(ya)(ya)油，這(zhe)樣(yang)可(ke)(ke)以獲得較好的(de)潤(run)滑性(xing)，相反，溫(wen)(wen)度(du)(du)低(di)(di)和(he)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)低(di)(di)的(de)系(xi)(xi)統，應選(xuan)用粘(zhan)度(du)(du)較低(di)(di)的(de)液(ye)壓(ya)(ya)(ya)(ya)(ya)油，這(zhe)樣(yang)可(ke)(ke)降低(di)(di)能(neng)耗。具(ju)體地說，粘(zhan)度(du)(du)選(xuan)用過(guo)高(gao)，對潤(run)滑性(xing)有利，但(dan)增加系(xi)(xi)統的(de)阻力(li)(li)和(he)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)損(sun)失，造成(cheng)功率損(sun)失增大(da)，油溫(wen)(wen)上升，液(ye)壓(ya)(ya)(ya)(ya)(ya)動作(zuo)不穩，出現噪(zao)音等(deng);過(guo)高(gao)的(de)粘(zhan)度(du)(du)還會造成(cheng)泵(beng)低(di)(di)溫(wen)(wen)啟動時(shi)吸油困難，甚至(zhi)造成(cheng)低(di)(di)溫(wen)(wen)啟動時(shi)中斷供油，發生設(she)備故(gu)障。相反，當液(ye)壓(ya)(ya)(ya)(ya)(ya)系(xi)(xi)統粘(zhan)度(du)(du)過(guo)低(di)(di)時(shi)，會增加液(ye)壓(ya)(ya)(ya)(ya)(ya)設(she)備的(de)內、外泄漏(lou)，阜陽液(ye)壓(ya)(ya)(ya)(ya)(ya)油，液(ye)壓(ya)(ya)(ya)(ya)(ya)系(xi)(xi)統工作(zuo)壓(ya)(ya)(ya)(ya)(ya)力(li)(li)不穩或壓(ya)(ya)(ya)(ya)(ya)力(li)(li)降低(di)(di)，嚴重時(shi)會導致泵(beng)異(yi)常(chang)磨損(sun)。

液(ye)(ye)(ye)(ye)(ye)壓(ya)油(you)(you)箱內油(you)(you)位過(guo)(guo)低若液(ye)(ye)(ye)(ye)(ye)壓(ya)油(you)(you)箱內油(you)(you)量(liang)太少(shao)，將使液(ye)(ye)(ye)(ye)(ye)壓(ya)系統沒有足夠的(de)流(liu)量(liang)帶走(zou)其產生的(de)熱量(liang)，導致油(you)(you)溫(wen)(wen)升(sheng)高。預防措施：在實際操(cao)(cao)作和保養過(guo)(guo)程中(zhong)，嚴格遵守操(cao)(cao)作規程中(zhong)對液(ye)(ye)(ye)(ye)(ye)壓(ya)油(you)(you)油(you)(you)位的(de)規定。如，一臺(tai)PC2003型液(ye)(ye)(ye)(ye)(ye)壓(ya)挖(wa)掘機(ji)，液(ye)(ye)(ye)(ye)(ye)壓(ya)油(you)(you)什么牌(pai)子好，工作一段時(shi)間后(hou)(hou)出現液(ye)(ye)(ye)(ye)(ye)壓(ya)油(you)(you)溫(wen)(wen)度過(guo)(guo)高故(gu)障；檢(jian)查(cha)液(ye)(ye)(ye)(ye)(ye)壓(ya)油(you)(you)箱，發現油(you)(you)位低于規定值很多，由于液(ye)(ye)(ye)(ye)(ye)壓(ya)系統過(guo)(guo)度缺油(you)(you)，抗磨液(ye)(ye)(ye)(ye)(ye)壓(ya)油(you)(you)多少(shao)錢，使液(ye)(ye)(ye)(ye)(ye)壓(ya)油(you)(you)循(xun)環過(guo)(guo)快(kuai)，未(wei)能充分(fen)靜置(zhi)散熱，結果油(you)(you)溫(wen)(wen)升(sheng)高；按規定加足液(ye)(ye)(ye)(ye)(ye)壓(ya)油(you)(you)后(hou)(hou)，液(ye)(ye)(ye)(ye)(ye)壓(ya)油(you)(you)溫(wen)(wen)度隨即降至正(zheng)常范圍。