What is the purpose of aligning belt centerlines within tolerance?

• A. To minimize wear and vibration by reducing misalignment.
• B. To maximize belt tension.
• C. To change pulley size.
• D. To simplify belt replacement.

Answer: (A)

Aligning belt centerlines within tolerance ensures a straight, true belt path between pulleys, keeping forces along the belt consistent and reducing lateral loading. When the centerlines aren’t aligned, the belt edge rubs on the pulleys, causing edge wear, increased heat, vibration, and bearing wear. Keeping alignment within tolerance minimizes these issues, extends belt life, improves tracking, and reduces noise. The other options don’t address wear and tracking: belt tension is adjusted separately, pulley size is a fixed design choice, and belt replacement effort isn’t helped by alignment control.