How to change Escalator Slewing chain?

The main function of the escalator slewing chain is to ensure that the escalator handrail is always in the correct position and height and runs smoothly.

In the escalator, the slewing chain is parallel to the handrail, with one end connected to the handrail and the other end connected to the return sprocket. The handrail is kept balanced and stable by the rotation of the return sprocket. This design not only improves the operating efficiency of the escalator, but also ensures the safety and comfort of passengers during the ride. After long-term use, the return chain may have problems due to wear and aging, such as unbalanced handrails and handrail displacement. Therefore, regular maintenance and replacement of the return chain is an important part of the escalator maintenance process.

The steps for disassembly and replacement of the escalator return chain mainly include the following points:

‌1. Turn off the elevator/escalator power supply to ensure safety. This is the first step in any repair or replacement work to prevent accidents.

2‌.Open the chain protection cover of the machine. This step is to be able to access the return chain that needs to be removed.

3‌.Remove the old chain. Using appropriate tools, such as wrenches and chain pliers, remove the old chain from the escalator. During the removal process, you may need to first remove the circlip and remove the bolts on the crossbar, and remove the crossbar to separate the left and right chains (for some escalator designs).

4‌.Measure and prepare the new chain. Measure the length of the new chain according to the length of the old chain to ensure that the new chain is the same length as the old chain.

5‌.Install the new chain. Use chain pliers to remove one link of the new chain and connect the new chain to the last link of the old chain (if possible). Then, bypass the drive shaft and return shaft of the escalator, guide the new chain to the upper and lower parts of the escalator, and connect it to the corresponding sprockets.

6‌.Tighten the new chain. Make sure that the gap between the chain and the sprocket is appropriate to ensure the normal operation of the escalator.

7‌.Apply lubricant. Apply lubricant evenly on the new chain to maintain the normal operation of the machine and extend the service life of the chain.

Please note that the above steps may vary depending on the specific model and design of the escalator. In actual operation, you should refer to the escalator's maintenance manual or consult a professional maintenance personnel for more accurate guidance.