garage door cables

How do you replace a garage door cable in five easy steps????

Dear friends and clients, we are pleased to share our experience and information regarding replacing cables on garage doors with torsion springs.

In this blog, I will write and tell you five steps to replace the cable on your garage door, saving you money and time. Please remember that this work may cause injury to you, so follow all safety precautions. You must use the right tool to do everything correctly and consistently.


Garage door cable functionality.

We should have thought about the critical function of garage door cables and how they work.  The garage door cables play a crucial role in the functioning of a garage door. These cables are connected to the first section of the door from the sides, near the bottom edge. The wires are fitted onto a special bracket at the bottom and then attached to the door. Section using screws for metal if it is a metal door or screws for wood if it is also a wooden door. Also, to the bottom bracket where the cable ring clings, there are holes for a roller, which performs an essential function for the garage door operation. Like all the other rollers, the first roller guides the door along the tracks. After installing the bottom bracket with the cable and rollers to the section, the cable is pulled under all the rollers that are located above and brought out to the drums, which are attached to the shaft from above. The cable is tied to the drum on both sides and then serves as a transmission of energy, or we call it the tension of the springs. All the force and energy from the springs are transmitted through the shaft to the drums, and then the energy is transferred to the cable, which is visually always tense like a string and should always be in this position.

The cable serves an essential function for adequately operating the garage door; the door works evenly, rises smoothly without deviations to the side, and evenly distributes the energy from the power of the springs. When opening a garage door, the force of the springs is lost evenly, and this force is transferred to the cable, which discharges the energy charge from the springs.  Have you ever thought about the incredible force that garage door springs must exert to lift and lower the heavy door multiple times daily? Remarkably, they can endure such strain and keep functioning for years. But it’s important to remember that even the most substantial springs will eventually weaken, so let’s appreciate their resilience.


garage door cables replacement


Causes of garage door cable failure.

Therefore, in the open position, the cables must permanently be tensioned up to the maximum opening point of the door. Very often, the cable flies off when the door is opened, and the springs are incorrectly balanced, which leads to a loss of balance and the cable flying out of the drum from the correct point. After this, the cable moves to the side, and when the door is closed, an irreversible process occurs with the garage door, which warps to one side and wedges between the vertical tracks. Of course, after such a breakdown, you should call the right garage door specialists, for example, Firstline garage door repair, and we will not only fix the problem but also tell you the main reason for the garage door breakdown. Another prevalent situation that leads to cable failure on garage doors is rust, which forms around the bottom brackets and is transferred to the cable fastening ring. The rust spreads more and more every year and the cable breaks between the bottom bracket and the cable ring at one point. Do not forget that the cable attachment is always under tension from the transmitted force of the springs. We may ask why your bottom vertical tracks, brackets, cables, and rollers rust. There is a short explanation for this: sometimes the foundation in the garage on the floor sags, and the space between the door and the floor opens, and the bottom elastic band, which is responsible for preventing moisture or water from getting into the inside of the garage, also deteriorates or hardens and does not become flexible. So, my dear readers, please watch your garage doors, especially your weatherstrips.

old garage door cables replacement


Five Steps to Replacing Garage Door Cables.

We smoothly move on to 5 steps to replace the cable, lower brackets, and two lower rollers. As a specialist, I advise everyone to change these three parts at once for the long and correct operation of the garage door.

  1. Please prepare the following tools
  • Impact Driver Kit
  • Sockets and head for it 7/16 (mainly, this site is used to replace bottom brackets)
  • Wrench 7/16 – hand tool
  • Winding bars
  • Vice grip
  • spare parts (bottom brackets, cables of the correct size in length and thickness). For example, if your doors are 7 feet tall, we must also purchase a cable for a 7-foot garage door; this is logically always correct, two pc rollers 2 inches.
  •  Ladder according to the height of your doors
  • Safety glasses
  1. First, we must remove the tension force from the springs. We can do this with winding bars. Carefully work with springs; first of all, it is your safety. You can push the winding bars into the hole at the base of the spring (coil) and loosen the mounting bolts. Moreover, reduce both springs until they stop entirely.

There is also a method to turn off the tension force of the springs when we do not release the springs from the attachment to the shaft but turn one of the springs in the opposite direction and place one of the winding bars as a wedge between the spring and the struts on the upper section. This relieves the tension of the springs, and we can work with the cables.


  1. Next, you need to unscrew the fastening in the drums and free the old cables. Using a screwdriver, we need to unscrew the screws from the bottom bracket and, using a crowbar, carefully pull the bottom bracket out of the section. You can untwist the jamb brackets on the vertical track to achieve success. Releasing the jamb brackets will help remove the bottom bracket from the section. You can apply some force to this and loosen the bracket until it is completely free.
  2. After you have managed to pull out the lower bracket with the cables together, we can begin installing new spare parts. We put the ring from the cable to the lower bracket and pushed the roller through the memorable excellent holes. We insert the brackets back to the section in the same place where it was before. It is necessary to put the roller on the track and tighten the screws on the bracket. We pull the cables through the rollers underneath and out to the drums.
  3. The last stage remains. We need to put the end of the cable into the drums and tighten them with a wrench with a 7/16 head, starting from either side. Before this, preparing a vice grip is necessary; we use it after stretching the cable onto a fixed drum on one initial side. We put this vice grip on the shaft and secured it tightly to the wall. This is so that when tensioning the springs, our cables do not fly off the drums. This is a mandatory point that must be present when working with the cable. Next, we tighten the second drum with the cable and clamp the bolts in the drum. Both wires must be taught and twisted around the drums. It remains to bring the springs into working condition. If you have released the tension force, you must tighten the springs to the correct balance. You can also watch a video of this on our YouTube channel.

Below link


garage door brackets, cables, rollers

If you twisted the spring and wedged it using winding bars, then you need to screw everything back into its previous position.

After all the steps, you will see stretched cables for long-term work. Please check the bottom seal level of your floor in the garage and close all the cracks from excess moisture; this greatly affects
the duration of your cable and the level of rust on the garage door parts. And it will also keep you warm inside the garage.