One cable attaches to the bottom of the door runs up and over the pulley above the door and around the spring pulley and then attaches to the door track bracket.
Youtube replace garage door extension springs.
There are two types of garage door springs.
One at the end of each spring and one at the top of the vertical door track they also have two cables on each side.
Double garage doors with overhead springs use torsion springs mounted to a central bracket in the middle of the door and can be used to help you understand the general principles for replacing garage door springs.
A pair of new springs cost about 25.
Home owners can replace an extension springs safely by following these steps.
Complete instruction to repair a broken garage door spring.
Since extension springs are determined by how much weight they each lift and the pulley system cuts this in half you need to replace your old springs with 200 pound extension springs.
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Do not try to remove the extension spring that is not broken when the garage door is closed.
The doors with two springs are easy to replace.
For instance your garage door may operate with extension springs tension springs or a combination of both.