This is almost always the result of a dirty or obstructed safety feature.
Garage door shake go going down.
As a result they are unable to balance out the weight of the door as it opens and closes.
First check the sensor lights.
For most doors a complete rotation of the screw allows the door to advance 2 inches.
Try to lower the door.
If you find that it keeps running this can present a problem in your system.
Turn the down adjustment one full turn counterclockwise.
Continue to turn the down.
Repairing garage door springs.
There are two types of pulleys used in garage door systems.
Press fit pulleys and cast iron pulleys.
Over time the springs of the garage door can get worn out or break.
If this is the case with your garage door ensure that you get the springs replaced.
Clutter or obstructions that block the sensor are the first problems to look for if your door won t close or in extreme cases open at all.
Press fit pulleys are the most used type of pulley system.
Your garage door s pulley system is responsible for ensuring that the door moves smoothly up and down on its tracks so strange behavior like shaking as the door descends warrants further investigation of the pulleys.
If your garage door hits it bounces up and starts to open again your garage door is working well.
In a typical situation the motor for your garage door opener should stop running once the door has closed.
You push the button to close the garage door.
Simply lay a 2 by 4 on the ground and let the garage door come down on top of it.
Lastly you ll want to perform a safety test.
There are two types of pulleys.
It goes partway down reverses direction and goes back up again.
Depending on the brand.