What might indicate that a pump is not properly lubricated?

When a pump is not properly lubricated, it can lead to mechanical friction and wear, which typically manifests as unusual noise and overheating. Unusual noises, such as grinding or whining, often signal that internal components are not moving as smoothly as they should due to insufficient lubrication. Additionally, overheating occurs because the lack of lubricant increases friction, generating excess heat that the pump is unable to dissipate effectively.

In contrast, consistent pressure readings would suggest that the pump is functioning normally, as would increased efficiency, which can indicate proper lubrication and operation. Measuring flow rates frequently is part of standard practice, but it does not directly indicate lubrication status. Therefore, the combination of unusual noises and overheating is a clear sign that the pump requires immediate attention regarding its lubrication.