When should oil-lubricated coupling be refilled?

The correct practice for refilling an oil-lubricated coupling is after any pump overhaul. This is essential because, during an overhaul, the coupling may have been disassembled or may have lost lubrication due to maintenance activities. Ensuring that the oil is topped up after such work is crucial for proper operation, as adequate lubrication helps to minimize friction and wear, which can lead to failure of the coupling components.

Regularly refilling the coupling ensures that it operates efficiently, but it is especially critical post-overhaul when the integrity of the lubrication may have been compromised. This proactive measure helps maintain the longevity and functionality of the equipment and mitigates the risk of breakdown or failure in operation.

Other options may imply routine maintenance practices, but the specific context of an overhaul necessitates immediate refilling to ensure optimal performance and reliability.