After about what period of initial full service operation on a new pump, or as directed by the manufacturer, all bearings should be regreased?

• A. 1 week
• B. 3 months
• C. 6 months
• D. 1 month

Answer: (D)

During the initial full-service operation of a new pump, bearings benefit from an early regrease to ensure the lubrication film fully forms and any initial contaminants are flushed out as the bearing settles in. About one month provides enough running time for lubrication to distribute and for any early wear tendencies to show up, without leaving the bearings under-lubricated for too long. Shorter intervals, such as a week, tend to be more frequent than necessary for most bearings, while longer intervals like three or six months risk insufficient lubrication during this critical break-in period. Always follow the manufacturer’s guidance, but using approximately one month for the first regrease is a common, practical practice.