Which statement is true about tapered roller wheel bearings during service?

In the context of tapered roller wheel bearings during service, it is indeed common practice to replace the seal whenever the bearings are serviced. This is because the seal plays an essential role in preventing contamination from dirt, moisture, and other debris while also retaining lubrication within the bearing assembly. A worn or damaged seal can lead to premature bearing failure, as contaminants can enter the bearing and ultimately cause damage or increased wear.

Replacing the seal ensures that the newly serviced bearings are adequately protected and that the assembly operates smoothly and efficiently. This practice contributes to the longevity of the bearings and promotes optimal performance of the wheel assembly as a whole. It's crucial to maintain the integrity of the bearing setup, and a fresh seal is a vital part of that maintenance process.