NCCER Millwright Practice Exam

Maintaining and repairing roller conveyors primarily consists of replacing damaged rollers because the rollers are critical components responsible for the movement of materials. Over time, rollers can become worn out, misaligned, or damaged due to constant use or environmental factors.

Replacing damaged rollers ensures that the conveyor system continues to operate efficiently without interruptions. If rollers are not in good condition, it could lead to a decrease in performance, causing jams or slowdowns in the conveyor system. This not only affects productivity but also poses a risk of further damage to other components of the conveyor system or the carried materials.

While tasks like lubricating chains, adjusting speed settings, and calibrating sensors are important aspects of overall conveyor maintenance, they are not as fundamental to the structural and operational integrity of roller conveyors as replacing damaged rollers. Chain lubrication is essential for other types of conveyor systems, speed adjustment relates to how the system operates rather than its physical condition, and sensor calibration is more about electronic monitoring and control rather than the physical repairs needed for roller conveyors.