Why Are Old Escalators Getting Noisier and More Impactful? Why Should the Step Chain, Step Rollers and Guide Rails Be Checked Together During Modernization?
After years of operation, old escalators may develop periodic noise, vibration, impact, or even slight step jumping. Many maintenance projects only replace the most visibly worn part. However, the escalator step chain, step rollers, and guide rails are closely connected as part of the step running system. During an old escalator modernization, all three should be inspected together.
1. Why Do Old Escalators Become Noisier Over Time?
Common causes include:
Wear on step chain pins and bushings, causing the chain pitch to gradually increase;
Wear, out-of-round conditions, or increased bearing clearance in escalator step rollers;
Uneven guide rail joints, localized wear, or guide rail misalignment;
Different elongation levels between the left and right step chains, causing uneven loading;
Mechanical wear of step axles, rollers, and other escalator step components.
These issues can affect each other, allowing minor vibration to gradually develop into noticeable operating noise and impact.
2. Why Should These Three Components Be Inspected Together?
1. The step chain determines the step running pitch
When the step chain becomes elongated, its engagement with the sprocket changes. This can cause periodic impact during operation and at the return areas. When chain wear reaches the allowable limit, escalator step chain replacement should be considered.
2. Step rollers affect running smoothness
Out-of-round, unevenly worn, or loose-bearing step rollers can cause the steps to move up and down as they pass along the guide rails. Even after replacing the step chain, abnormal rollers may continue to cause vibration.
3. Guide rails determine the roller running path
Localized guide rail wear, deformation, or uneven joints can continuously impact the step rollers. If only the rollers are replaced without correcting the guide rail problem, the new rollers may quickly develop uneven wear again.
Therefore, during escalator modernization, the entire step running system should be evaluated instead of focusing on only one wear part.
3. How Can These Problems Be Addressed During Modernization?
During escalator maintenance, check the step chain elongation, left/right chain tension, roller roundness, bearing clearance, and the condition of guide rail joints and wear.
Severely elongated step chains, out-of-round rollers, or abnormal guide rails should be replaced, adjusted, or repaired according to the equipment requirements. After maintenance, perform continuous running tests and pay particular attention to the upper and lower return areas to confirm whether periodic impact or abnormal noise remains.
4. Escalator Modernization Parts Purchasing Tips
Before purchasing escalator modernization parts, confirm the escalator model, step chain pitch, chain length, roller diameter, bearing specifications, step dimensions, and guide rail structure.
For old or discontinued escalator models, it is recommended to provide photos of the original spare parts, actual measurements, and equipment parameters to avoid component mismatch.
5. A-FLY Elevator & Escalator Parts Supply
A-FLY supplies escalator step chains, step rollers, escalator steps, drive chains, sprockets, and other escalator step components for escalator maintenance, repair, old escalator modernization, and upgrade projects.
A-FLY supports model identification, dimensional matching, sample confirmation, and OEM/ODM services, while also supplying mechanical, electrical, and safety-related escalator parts to provide one-stop elevator and escalator parts sourcing for contractors, maintenance companies, and distributors.
Conclusion
Increasing noise and impact during step operation in old escalators is usually not caused by a single component. Inspecting the step chain, step rollers, and guide rails together helps identify the real source of abnormal loading and periodic impact more accurately, reducing the risk of recurring problems after modernization.
