Why Do Escalator Return Chain Links Become Stuck?
In the escalator handrail return system, the escalator return chain needs to continuously bend and operate around the escalator newel area. Therefore, each chain link must maintain smooth and flexible movement.
Once the return chain becomes stuck, it not only increases operating resistance but may also cause handrail vibration, abnormal noise, and uneven handrail return movement.
1. Why Do Escalator Return Chain Links Become Stuck?
1. Wear of Chain Pins and Bushings
After long-term cyclic operation, the chain pins, bushings, and connecting parts of the escalator return chain gradually wear.
When local deformation or excessive clearance occurs, the chain links may become tight and difficult to bend smoothly.
2. Insufficient Lubrication or Oil Contamination
Insufficient lubrication increases friction between chain pins and bushings.
Meanwhile, if lubricating oil mixes with dust and forms sludge, it can also prevent the chain links from rotating freely.
3. Chain Link Corrosion
Operation in humid environments or lack of regular maintenance may cause corrosion on chain pins and connecting areas.
As a result, originally flexible chain links may gradually become stiff or completely stuck.
4. Abnormal Return Path or Tension Condition
If the escalator newel chain is over-tensioned, the guide position is misaligned, or the return rollers are abnormal, some chain links may experience additional side loads.
This can accelerate uneven wear and chain link sticking.
2. What Problems Can Stuck Chain Links Cause?
Normally, the escalator chain should smoothly change direction when passing through the newel area.
When a chain link cannot rotate freely, it creates periodic resistance during the return movement.
Common symptoms include:
Regular abnormal noise from the newel area;
Handrail vibration during the return process;
Increased chain operating resistance;
Local chain link jumping or unstable movement;
Accelerated wear of guide components and related escalator spare parts.
3. How to Handle Escalator Return Chain Problems?
During escalator maintenance, technicians should check the flexibility of each chain link and inspect:
Chain pins;
Bushings;
Rollers;
Guide components;
Chain tension condition.
For minor lubrication issues, cleaning and proper lubrication can be carried out according to equipment requirements.
However, if chain links are corroded, severely worn, deformed, or continue to stick, replacement is recommended.
At the same time, the return path should be inspected to prevent abnormal loading on the new chain.
4. Escalator Return Chain Purchasing Tips
When purchasing an escalator return chain, the following specifications should be confirmed:
Chain pitch;
Chain link dimensions;
Pin specifications;
Total chain length;
Connection structure;
Installation method.
Different escalator models may use similar-looking return chains, but their dimensions may not be interchangeable.
For unclear models, it is recommended to provide:
Photos of the original chain;
Escalator model information;
Actual measured dimensions.
This helps ensure accurate product matching.
5. A-FLY Escalator Parts Supply Capability
A-FLY supplies a wide range of escalator spare parts, including:
Guide rollers;
Other escalator wear parts.
These products are suitable for escalator repair, maintenance, and modernization projects.
A-FLY supports:
Model confirmation;
Dimension matching;
Sample confirmation;
OEM/ODM customization.
We provide engineering contractors, maintenance companies, and distributors with one-stop elevator and escalator parts purchasing solutions.
Conclusion
Sticking of escalator return chain links is usually related to chain wear, insufficient lubrication, corrosion, or abnormal loading conditions in the return system.
When periodic noise or increased resistance appears in the handrail return area, the flexibility of the chain links and the complete return system should be inspected promptly to prevent further equipment damage.
