Question 30 CEL01 - Chief Engineer - Limited

The Correct Answer is B. **Explanation for B (inner race):** When removing a roller bearing (or any mounted bearing) from a shaft using a puller, the force must be applied directly to the part of the bearing that is press-fitted onto the shaft. The **inner race** is the component of the bearing that has an interference fit with the shaft. Applying the force directly to the inner race ensures that the removal force is effectively transmitted to the interference fit area, minimizing damage to the bearing elements (such as the rollers or balls) and facilitating a smooth, controlled removal. **Why other options are incorrect:** * **A) outer race:** The outer race is press-fitted into the housing, not the shaft. If you apply the puller force to the outer race, you will pull the outer race away from the inner race and rollers, causing the bearing to fall apart (damage or destruction) rather than removing it cleanly from the shaft. * **C) retainer plate:** The retainer plate (or cage) holds the rolling elements (rollers/balls) in place. It is the weakest structural part of the bearing. Applying force here would immediately bend, break, or destroy the cage, scattering the rolling elements, but would not remove the inner race from the shaft. * **D) raceway:** The raceway is the path the rolling elements follow. While the inner race contains a raceway, applying force specifically to the thin, curved surface of the raceway using standard puller jaws is impractical and risks damaging the precision surface of the bearing, potentially making removal difficult. The force must be applied to the rigid structure of the inner race face or shoulder.