Question 5 1AE01 - First Assistant Engineer

The Correct Answer is B. **Explanation for Option B (split washer or backup ring):** When removing an antifriction bearing (such as a ball or roller bearing) from a shaft using a wheel puller (often a hydraulic or mechanical puller), the puller jaws need a solid surface to grip against. If the bearing is mounted flush against a shoulder, the puller jaws might not fit, or they might try to pull on the inner race, which can damage the bearing. A wheel puller setup usually requires accessory attachments to pull the bearing cleanly, often by gripping the outer race or both races simultaneously. A **split washer, backup ring, or bearing separator/puller plate** is placed behind the bearing (or fitted snugly around the shaft) and pressed against the inner race or shoulder of the bearing. This component then provides a stable, flat surface for the puller jaws or hydraulic ram extensions to press against, ensuring the bearing is extracted evenly and without damage. **Why the other options are incorrect:** * **A) split die:** A split die is a tool used in threading operations (cutting external threads on a shaft) and has no function in safely extracting a bearing using a puller. * **C) jack screw:** A jack screw is a type of mechanical screw mechanism used for lifting heavy weights or applying large forces. While an arbor press or some large pullers use a screw mechanism (sometimes called a forcing screw), the jack screw itself is not the accessory attachment placed behind the bearing to provide a gripping surface for the puller jaws. * **D) ring gage:** A ring gage is a highly precise measurement tool used to check the diameter and tolerance of cylindrical parts (like a shaft). It is a passive measuring tool and plays no role in the mechanical removal process of a bearing.