There are two types of pulleys.
Garage door shakes.
A garage door opener that is shaking really hard when opening or closing is the warning sign of a bigger problem.
It s likely a pulley problem 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.
The first thing you should do is close the garage door and inspect the spring s.
It doesn t completely stop it s more of a stutter.
If your garage door shakes when opening or closing or sounds like it is going to fall off the track the problem is most often the pulleys.
In a torsion spring system the spring will be mounted on a spring bar torsion tube that is mounted to the header above the garage door opening.
Press fit pulleys and cast iron pulleys.
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This only happens when opening not closing.