Broken Tension Spring or Cable. Here are the five different garage door items you should inspect that could be triggering your jammed garage door and their possible fixes. When a garage door cable comes off the pulley, the tension on the pulley must be first released and then restored. Before we help you diagnose your stuck garage door, safety concerns can't be over stated. Lodged Garage Door Track. Connecting the cable back onto the spring requires some strength, and you will need the help of another person to successfully execute the repair. The cables attach on both sides of the garage door to the bottom brackets on the garage door. These cables are typically constructed of aircraft aluminum or stainless steel. A garage door cable malfunction could cause major problems in the functionality of your garage. Even though the garage door cable is a central part of the system, it might not be necessary to call in a professional to get it back on track. At best, this could mean the inconvenience of not being able to open or close the door; at worst, a falling door could cause a serious injury. Cause: The job of controlling the slow and smooth lowering of your garage door is that of the tension springs or cables. Garage doors have a cable on each side that’s wound around a drum with one end attached to the door itself. Your jammed garage door can be caused by something as simple as an obstruction in the track. This procedure can be hazardous if you are not experienced in working with cable garage door opener systems. When trying to figure out how to fix a stuck garage door, it is important to take every safety precaution. Even with regular maintenance, garage doors can sometimes stick, refusing to open or close. If the garage door is the only entrance, then you can probably save yourself a lot of heartache by ringing us straight away and requesting an emergency call-out, because we not only have the expertise, but also the special tools needed to open that door whilst causing the minimum of damage to it. Energy from the spring turns the drum which either winds or unwinds the cable, thereby lifting or lowering the door. And if the cables snap, the loose ends may fly out and strike somebody standing nearby. The cables then run up the height of the garage door and wrap around the drums. Garage door cables are the strands of wire bundle together to form the cable that assist in lifting the garage door. 1. If these become damaged the garage door could slam shut very quickly. If one of these cables is broken power from the spring can’t get to the door and the door hangs crooked. How to Fix a Garage Door That Gets Stuck Halfway.