During the greasing of a pump in operation, what was done incorrectly?

Greasing a pump while it is in operation is considered incorrect because it can lead to several potential issues. When a pump is running, the moving parts are under dynamic conditions which can make it difficult to properly distribute the grease. This can result in uneven lubrication, leaving some areas without adequate grease and potentially leading to increased wear or even failure of the pump components.

Additionally, applying grease while the pump is functioning has the possibility of introducing contaminants into the lubrication system, as the process disrupts the sealed environment required for effective lubrication. This can compromise the integrity of the grease and introduce particles that could contribute to abrasive wear or other operational issues.

In contrast, other options, while they may present problems in specific contexts, are not as fundamentally detrimental to the operation of a pump as greasing it while it is running. For example, applying grease too quickly can cause the grease to overflow or become air-entrained, but it doesn't interfere with the basic principle of maintaining lubrication. Sealing the grease fitting is important for preventing leakage, and using the wrong type of grease can be problematic, but these issues do not carry the same immediate operational risks that come from greasing a running pump.