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REPAIR SERIES - Roller Chain Replacement

Writer's picture: Pulse Blind WorxPulse Blind Worx

Replacing the chain in a roller blind can be a simple fix that restores your blind’s functionality without needing a full replacement. Whether your chain is worn out or has broken, following these steps will guide you through the process of replacing it and getting your roller blind working like new.


What You’ll Need:

  • Replacement chain (with appropriate size and type)

  • Replacement clutch (if necessary)

  • Small flathead screwdriver

  • Scissors

  • Tape (optional, for holding parts in place)

  • Measuring tape (optional, for exact chain length)


Step 1: Remove the Roller Blind from the Brackets

To begin, carefully remove the roller blind from the brackets. Depending on the type of brackets you have, this might involve either lifting the blind up or releasing a clasp. Make sure to take note of how the blind is attached so you can rehang it correctly later.


Step 2: Inspect the Clutch

Before you start replacing the chain, examine the clutch mechanism to check if it’s functioning properly. The clutch is the part that controls the rolling and unrolling of the blind when you pull on the chain.

  • Types of Clutches: Roller blinds come with different types of clutches. Some clutches are sidewinding, where the chain runs along one side, while others are chain-driven, with a pull chain that’s integrated directly into the mechanism.

  • Clutch Size: Clutches come in various sizes, so it’s important to select one that matches the size of your roller blind. You’ll need to check the diameter of the tube inside the clutch and the overall design of your blind to determine which type you need.


If your clutch is damaged or broken, it’s best to replace it at the same time you replace the chain. Be sure to match the clutch size with the one originally used in your blind.


Step 3: Remove the Old Chain - Roller Chain Replacement

Use a small flathead screwdriver to carefully detach the old chain from the clutch mechanism. In most cases, the chain is connected to the clutch via a small hook or loop. Gently remove the chain, making sure not to damage the clutch mechanism.

If the chain is threaded through a mechanism, carefully untangle and remove the chain. Set it aside as you prepare to replace it.


Step 4: Measure the Replacement Chain

Roller blinds typically use beaded chain, which comes in different sizes, such as 3mm or 4.5mm diameter chains. Make sure to choose the correct size of chain for your blind:

  • Standard Sizes: Most roller blinds use a 3mm or 4.5mm chain size. The 4.5mm chain is usually used for heavier or larger blinds, while the 3mm chain is common for lighter blinds.

  • Chain Length: Measure the length of the existing chain before removing it to ensure that your replacement chain is long enough. The length will depend on how far the chain needs to run, typically a little longer than the height of the blind, allowing for easy operation.

  • If you’re unsure of the exact size, consult the blind manufacturer or check the specifications for your specific blind.


Step 5: Attach the New Chain to the Clutch

Once you’ve got the right replacement chain, it’s time to attach it to the clutch. Most chains simply hook into the clutch mechanism, but be sure to follow the instructions that came with your specific clutch if it’s a specialized mechanism.

  • If the chain has a connector, you’ll need to attach the end of the chain to the connector before connecting it to the clutch.

  • If the chain is beaded, simply thread the beads into the clutch’s hook or loop.

Ensure that the chain is securely attached and that it moves smoothly through the clutch when you pull on it.


Step 6: Test the Clutch and Chain

Before reattaching the blind to the window, test the chain and clutch by pulling on the chain. Make sure the roller blind rolls up and down smoothly without resistance. If the chain feels too tight or too loose, adjust the tension by moving the clutch slightly or trimming the chain to the desired length.


Step 7: Reassemble the Roller Blind

Once the chain is in place and you’re satisfied with the operation, it’s time to reassemble the blind. Place the roller blind back into the brackets and ensure it is securely attached.

  • Tip: If you’re having trouble fitting the blind back into the brackets, tape the top of the blind to hold it in place while you secure it.


Step 8: Final Test

Finally, pull the chain to make sure the blind operates smoothly and properly. Check the entire range of motion—raise and lower the blind completely. Ensure that the clutch is functioning well, and the chain runs freely without any issues.


Understanding the Different Clutches and Chain Sizes

As mentioned earlier, roller blinds come with a variety of clutches, and understanding the differences is key to choosing the right replacement parts.


1. Clutch Mechanisms:

  • Sidewinder Clutch: This is the most common type, where the chain moves along the side of the blind and is connected directly to the clutch mechanism.

  • Chain-Driven Clutch: A less common mechanism, this involves a more direct integration of the chain into the gear system, which can handle larger or heavier blinds.

2. Chain Sizes:

  • 3mm Beaded Chain: Ideal for standard, lighter roller blinds. This size is often used in most residential applications.

  • 4.5mm Beaded Chain: Used for heavier or larger roller blinds. The thicker chain provides additional strength to manage the weight of bigger blinds.


3. Choosing the Correct Chain:

  • If you're unsure of the correct chain size, it’s important to check the manufacturer’s specifications or bring the old chain to a local blind retailer for help.

  • Always ensure that the new chain fits smoothly into the clutch and can handle the weight of the blind.


Additional Tips:

  • If you have a motorized roller blind, be aware that it requires different components and repair procedures. You should consult the manufacturer for specific replacement parts.

  • Regularly clean your chain and clutch to prevent dust and dirt buildup, which can cause the mechanism to stick or wear out prematurely.

  • If your clutch mechanism appears damaged or if the chain keeps slipping, it may be a sign that the clutch needs replacing along with the chain.

By following these steps and choosing the correct parts, you can easily replace the chain in your roller blinds and have them functioning like new. It’s a cost-effective way to restore the operation of your blinds without the need for a full replacement.


If you need help, you can book an appointment here:


Close-up of a white beaded roller blind chain mechanism on a smooth surface.

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