Escalator step sag, which refers to the dipping or sinking of escalator steps below their normal level, is a problem that affects the safety and smooth operation of escalators. Several factors can contribute to this issue. One common cause is wear and tear on the step rollers. The step rollers are small wheels that support the steps and allow them to move along the escalator's tracks. Over time, these rollers can wear down due to friction and exposure to dirt and debris. Worn rollers can cause the steps to sag as they no longer provide adequate support. Another cause is stretching or wear of the step chain. The step chain connects the steps together and pulls them along the escalator's path. If the cha....
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