What is the proper lubrication procedure for anti-friction bearings?

Choosing to pack grease between the balls or rollers and filling half the case is appropriate for anti-friction bearings because this method ensures that the bearing is adequately lubricated without causing overheating or damage due to excess lubrication. When bearings are overfilled with grease, it can lead to increased operating temperatures and excessive pressure inside the bearing which can ultimately result in failure.

By packing the grease in this manner, a sufficient amount of lubrication is provided for the rolling elements while allowing space for the movement of the lubrication as the bearing operates. This helps maintain optimal performance and longevity of the bearing, as it allows for the proper distribution of grease during operation.

In contrast, completely filling the bearing with grease, as suggested in another option, risks creating excessive pressure and heat, which can negatively impact bearing performance. Lubricating only the outer race does not ensure that the rolling elements are sufficiently lubricated, and applying oil followed by grease may lead to inconsistencies in lubrication that could affect the bearing's functionality. Thus, the recommended method balances lubrication efficiency and bearing health effectively.