How to replace garage door cable?

How to replace garage door cable?


Replacing a garage door cable is a task that may seem daunting at first, but with the right knowledge and tools, it can be done successfully. Whether your garage door cable has snapped or become worn out over time, this article will guide you through the process of replacing it. By following these steps, you can ensure the safety and functionality of your garage door.

Step 1: Safety Precautions

Before starting any work on your garage door, it is essential to take the necessary safety precautions. Make sure to disconnect the power to the garage door opener to prevent any accidental activation. Additionally, wear protective gloves and safety glasses to protect yourself from potential injuries.

Step 2: Gather the Materials

To replace the garage door cable, you will need the following materials:

– Replacement garage door cable: Measure the length of your existing cable to ensure you purchase the correct size.

– Winding bars: These bars are used to release the tension on the garage door springs.

– Adjustable wrench: This tool will be needed to loosen and tighten nuts and bolts.

– Pliers: Pliers will come in handy for gripping and manipulating various components.

Step 3: Release the Tension

Before removing the old cable, it is crucial to release the tension on the garage door springs. This step is essential for your safety, as the springs are under high tension and can cause serious injuries if not handled properly. Use the winding bars to unwind the springs and release the tension gradually.

Step 4: Remove the Old Cable

Once the tension is released, you can proceed to remove the old cable. Start by detaching the cable from the bottom bracket and then loosen the cable drum set screws. Carefully unwind the cable from the drum and remove it from the garage door.

Step 5: Install the New Cable

Now that the old cable is removed, it’s time to install the new one. Begin by threading the new cable through the cable drum and then wind it around the drum. Make sure the cable is properly aligned and seated in the drum grooves. Next, attach the cable to the bottom bracket, ensuring it is securely fastened.

Step 6: Reapply Tension

Once the new cable is installed, you need to reapply tension to the garage door springs. Use the winding bars to wind the springs in the opposite direction of the unwinding process. Gradually increase the tension until the springs are properly balanced.

Step 7: Test the Garage Door

After completing the cable replacement and reapplying tension to the springs, it’s time to test the functionality of your garage door. Reconnect the power to the garage door opener and operate the door a few times to ensure it opens and closes smoothly. If any issues arise, double-check the cable installation and tension.


Replacing a garage door cable may seem like a complex task, but by following these steps and taking the necessary safety precautions, you can successfully complete the job. Remember to release the tension on the springs, remove the old cable, install the new cable properly, and reapply tension to the springs. By doing so, you can ensure the safe and efficient operation of your garage door.