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   真空(kong)擠出機的理想工(gong)(gong)作溫(wen)度(du)(du)(du)(du)應介乎45℃－50℃之間，原因(yin)是(shi)機器(qi)依據一選定的壓(ya)力油(you)粘度(du)(du)(du)(du)而(er)設計，但粘度(du)(du)(du)(du)會隨(sui)著油(you)溫(wen)的高低(di)(di)而(er)變化(hua)，進而(er)影(ying)響(xiang)系統(tong)中工(gong)(gong)作元(yuan)件，如油(you)缸(gang)、液壓(ya)閥(fa)等(deng)，使控制精(jing)度(du)(du)(du)(du)和響(xiang)應靈敏度(du)(du)(du)(du)降低(di)(di)，對(dui)于(yu)精(jing)密注射機的情(qing)況尤甚。同時溫(wen)度(du)(du)(du)(du)過(guo)高亦會加(jia)速(su)密封(feng)件的老化(hua)令其(qi)硬化(hua)、碎(sui)裂(lie)；溫(wen)度(du)(du)(du)(du)過(guo)低(di)(di)則加(jia)工(gong)(gong)能量消耗大，使運轉速(su)度(du)(du)(du)(du)降低(di)(di)。因(yin)此密切注意液壓(ya)油(you)的工(gong)(gong)作溫(wen)度(du)(du)(du)(du)是(shi)必要的。油(you)溫(wen)過(guo)高的原因(yin)多樣(yang)，但多歸于(yu)油(you)路故(gu)障或冷卻系統(tong)的失效等(deng)。