These are the up & down settings for how far the door goes down before touching the floor and how far the door comes up into the header of your garage, before it stops. These, like i said should never really have to be touched. On occasion if these need adjusting then this is a sign that the gear inside is getting warn. Its jumping on the teeth of the gear that is inside of the motor and its time to change the gear out.
Now on to the other settings, the ones that make the door stop and reverse if the door comes down on something. These are a second safety precaution that tie in with your safety sensors at the bottom of your garage door. If something drops into the way of your garage door, that is above the line of sight of your safety sensors. Then these settings are what causes the door to reverse.
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