In hoistway maintenance, what does "worn sheave" refer to?

A "worn sheave" specifically refers to a sheave wheel that has degraded or suffered wear over time, which can significantly affect the movement of the cables used in the hoisting system of the elevator. Sheaves play a critical role in maintaining proper tension and alignment of the cables, ensuring smooth operation and preventing excessive wear or damage to the cables themselves. When a sheave is worn, it may not provide the necessary support and guidance for the cables, potentially leading to increased friction, abnormal wear patterns, or even malfunction in the elevator system. This degradation can cause operational issues, such as jerky movement or increased noise, and may necessitate immediate attention to ensure safe and effective elevator functioning.