Fixing Garage Door Vertical Spring Mount




Recently, My electric garage door failed to open. It jammed after starting to open. It looked like it was twisting. I was able to open it by disengaging the worm gear and opening it manually. Looking around it while it was closed I noticed that the spring on one side was not extended like the spring on the other. I discovered that the hook bolt was no longer there. It had snapped and disappeared. Note that these pictures are taken retrospectively to show how I did it, not during the process. That is why they move from one side to the other in the pictures. It must be remembered that the springs are stretched a lot when the door is closed and just a bit when the door is open.

This first picture is of the broken J- hook bolt and where it attaches.


Step 1: The Hook

First step. Measure carefully to see that the bolt to be bought is long enough and has enough thread to tighten up to the same length as the other bolt. After obtaining a replacement J-Bolt, open the garage door and attach the spring to the mount with chains or rope as best you can. Chains are better because the rope will stretch. (Voice of experience here). The tighter that you can get it the better, because the spring is under some tension when it is working properly.

Step 2: Stretching the Spring

Close the garage door. This stretches out the spring. Then insert as many thin pieces of wood/fibreboard as is possible in the springs. You want to make it so that the spring is still slightly stretched out when the door is opened in order to fit the J-bolt.

Step 3: Fixing the J-Bolt`

Open the garage door and fix the J-Bolt. See picture. Tighten up to as near as possible the same length as the other side. Close the door and remove the spacers.

That's it. Job done.

Step 4:



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    3 Discussions


    1 year ago

    Cool way of controlling the "spring of death" there! Those things are not easy to stretch, and can easily cause injury (probably a good job no-one was around when the J-bolt let go. Did you ever find the missing pieces?)

    1 reply

    Reply 1 year ago

    Thanks MikB, I did find the missing pieces. That is them in the first photo taped to the inside of the door. I initially for a few days had the spring pulled down with multiple turns of rope, but I noticed that every time I opened the door the rope had stretched, and eventually it got caught in behind the bottom bracket. The bike lock chain was Ok, even if I couldn't get it too tight. Another mistake that i made was ordering an M8 bolt. It should have been M10.


    1 year ago

    I'm glad that you could fix it :)