在农村经常遇到因农用水泵缺油或所用油脂不对造成轴承损坏的情况。有的水泵因误加不符合规定的润滑脂，连续运行不到一昼夜，滚动轴承就损坏，可见正确选用润滑脂的重要。 　　机械上常用的润滑脂有 2种，一种是国标 GB491－ 65钙基润滑脂，其牌号有 ZG2、 ZG3、 ZG4、 ZG5， In rural areas are often encountered due to lack of agricultural pumps or grease used to cause damage to the bearings. Some pumps due to incorrect addition of non-compliant grease, continuous operation less than a day and night, the rolling bearing damage, we can see the correct choice of grease important. There are two kinds of grease commonly used in machinery, one is GB GB491-65 calcium-based grease, its grades ZG2, ZG3, ZG4, ZG5,