As garage doors are used, they suffer from various damages, which need you to repair them, either by yourself or by hiring a professional. No matter who repairs the garage door, when the door is damaged, it is you, who has to identify the problem first. For that, you need to know about the various parts of your garage door.

The following garage door parts diagram will help you in this regard. 

All the garage door parts can be divided into three main categories, the frame, moving parts, and the garage door opener. The frame of the garage door consists of the parts that are fixed in their places, such as the tracks, brackets, etc. The moving parts include the roller, springs, cables, etc. And the garage door opener includes, well, the opener itself. 

Let’s take a detailed look at a diagram of garage door parts. 

Diagram of garage door parts

garage door diagram

As garage doors have a lot of parts, it is natural that they will wear down over time, either due to continual usage or for some other reasons. When that happens, you have to take measures to repair the damages immediately.

But how can you take appropriate measures if you don’t know what is wrong with your garage door? 

To know what is wrong with your garage door, you must know about the parts of the door and their functions. Here are the garage door parts’ names, diagrams, and related details every one of them. 

Garage door frame

Garage door frame

The garage door frame includes the stationary parts which don’t move at all. The parts of the garage door frame include:

1. Garage door tracks

Garage door tracks

Garage door tracks are installed all around the door, and they are fixed to the wall. These metal tracks are used as a pathway for the garage door rollers to move, which enables the door to move up and down smoothly.

There is also a trolley track, which is situated at the door’s center. This track, which is attached to a spring, uses garage door cables to move the door. 

2. Garage door brackets

Garage door brackets

There are two types of garage door brackets, the flag bracket and the jamb bracket. The function of these brackets is to attach the garage door tracks to the ceiling as well as the walls.

These brackets also attach the roller to the garage door. 

3. Garage door hanger kits

Garage door hanger kits

The hanger kits, which are made of galvanized steel, have punched holes in them. These are used to attach the garage door opener to the garage’s ceiling. They can also be used to attach garage door tracks to the ceiling.

The hanger kits can be adjusted for the height of the door, and the ceiling. 

4. The bottom rail

Garage door The bottom rail

The bottom rail is one of the most underrated parts of a garage door. These make sure the door is closed and kept in place properly. If the bottom rails are damaged, or the floor is uneven, then the door will not be properly closed, which will allow water, pests, and debris into the garage. 

Garage door moving parts

A typical garage door has a lot of moving parts. These parts are usually smaller than the parts of the garage door frame and tend to get damaged more often. These parts include –

1. Garage door rollers

Garage door rollers

The rollers of the garage door are small wheels that are attached to the garage door. These wheels run along the garage door tracks and move the door up and down smoothly. 

2. Garage door hinges

Garage door hinges

The hinges of the garage door are situated in different places according to the type of door. If the door is a traditional side-hinged one, then the hinges are situated at the sides of the garage door.

On the other hand, if the garage door is a sectional garage door, then the hinges are attached to each section of the door, which allows the sections to bend over the curved section of the track. 

See the garage door hinge diagram for a better understanding. 

3. Cable and pulley

Garage door Cable and pulley

There are a lot of parts of the garage door that work to ensure the door moves along the tracks smoothly. The pulley and cable of the garage door are two such parts. The garage door cable is attached to both the opener and the garage door springs. These cables pull the garage door to open them. 

Since garage doors can weigh over 250 pounds, there is every chance that the cable will snap under the immense weight. This is where the garage door pulleys come in. They provide much-needed mechanical support to the cable, so that the door can be opened by it, and closed gently as well. 

Take a look at the garage door cable diagram

4. Cable drum

Garage door Cable drum

Depending on the type of garage door, there can be one, or more than one cable drum in a garage door. These drums contain the aforementioned cables and release them as they open and close the doors. One of the main reasons garage doors don’t open is when the drums get loosened. 

5. Curved door arm

garage door Curved door arm

The curved door arm is a small part of the garage door, which is attached to its trolley. This connects the door with the garage door chain, or belt, and ensures the door moves smoothly. 

6. Garage door spring 

Garage door spring 

Garage door springs are one of the most important parts of the garage door system. These springs open and close the garage door by coiling and uncoiling, which puts a force on the door. When the garage door springs are damaged, your door won’t be able to open all the way. 

7. Garage door chain, belt, or screw

Garage door chain, belt, or screw

Garage door chains are metallic chains that open and close the door. Sometimes these chains get misaligned, which can be fixed by you. These chains are noisy, which is why people often prefer belts, which operate the same way as the chain. 

On the other hand, garage door screws are threaded pieces of metal that rotate the motor of the garage door, as a result of which the door moves up and down. These are the most expensive of the three options, but they are durable and don’t need to be adjusted. 

8. Emergency release cord

garage door emergency release cord

The emergency release cord is a red cord that needs to be pulled to detach the garage door from the garage door. This is put in place so that you can open your garage manually in case a power outage takes place.

This is one of the most important electric garage door components. 

Garage door opener

The garage door opener is a motor that is attached to the ceiling of the garage. This motor produces power so that the other parts can work together and open or close the door. Contrary to popular belief, the owner doesn’t do most of the work. It merely produces enough power so that the cable, chain, and spring can operate the door. 

Here is a diagram of a garage door opener –

garage door opener diagram

Final Words

The goal of our garage door parts diagram is to make you acquainted with every part of your garage door so that you can identify what is wrong with it when it malfunctions. There are some damages you can deal with yourself, but some damages need to be dealt with by a professional.

Book our garage door repair service to repair the damages you can’t repair yourself. 


1. What is a 1 piece garage door?

1 piece garage doors are doors that are made of a single panel. These overhead garage doors are attached to hinges that are attached to the jambs. 

2. What is a manual garage door?

Manual garage doors are those which lack a fundamental part mentioned above, the garage door opener. Instead of using the opener to open the door, you have to open these garage doors manually. 

3. What is a 2-layer garage door?

2 layer garage doors are doors that have two layers instead of one. More often than not, these doors have a layer of insulation over a base layer.