Which of the following are signs of worn bearings in rotating equipment?

The presence of excessive noise, vibrations, and increased operating temperatures are clear indicators of worn bearings in rotating equipment. When bearings begin to wear down, several changes occur in their operation. Increased friction due to wear can lead to higher temperatures, as the parts are less able to move smoothly against one another. This friction not only generates heat but can also create vibrations that are often felt throughout the machinery. These vibrations may indicate misalignments or imbalance, further exacerbating wear and tear on the bearings.

Additionally, the sounds produced can range from a subtle grinding to more pronounced knocking or rumbling, which signifies that the internal components are no longer functioning optimally. Monitoring these signs is crucial, as they help in diagnosing issues early, allowing for timely maintenance or replacement, thereby preventing further damage to the equipment.

In contrast, a state of high energy efficiency typically denotes well-functioning equipment, while consistent performance and low temperatures are signs of proper operation, not wear. Silence and stillness, while seemingly a positive trait, could indicate a non-operational state rather than functioning machinery, which makes these options less relevant in identifying bearing wear.