Is it normal for the bellows cover to produce noise (such as friction or metallic sounds) during extension and retraction?

During the initial period of use, slight friction noise is generally considered normal.

However, if any of the following conditions occur, prompt inspection is recommended:

• The abnormal noise gradually becomes more severe
• Distinct metallic impact sounds are heard
• Movement becomes less smooth
• Noise occurs repeatedly at specific travel positions

Common causes may include:

• Damaged sliders
• Worn or damaged rollers
• Interference between internal components
• Foreign objects trapped inside
• Misalignment during installation
• Actual on-site installation space differing from the design drawings

Early inspection and corrective action can effectively prevent further component damage and help extend the service life of the product.