The chain trolley might move and if it does leave a gap of 2 to 4 inches between the trolley and the cover protection bolt.
How to set limit switches on garage door.
Measure the distance from the top of the garage door opening to the bottom of the garage.
The measurement is used to reset the up.
First locate the limit switch.
Go to the manufacturer s website or try manuals online they may have a copy that you can download.
Set your multimeter to continuity or resistance and connect it to the two indicated terminals on the switch.
Press the button on your remote to open the garage door.
Open the garage door and watch it closely as it opens.
Garage door doesn t open all the way.
A garage door that fails to open fully can be fixed by adjusting the limit screws.
When the garage door opens about halfway or 5 feet from the ground and stops the up.
Stand on a step ladder to reach the up limit switch adjustment screw on the side of the garage door opener.
Switches requires the use of a screw drive or socket to loosen the set screw on the limit switch bracket.
If the door is closing and reversing you need to set the limit switch so that it stops the door sooner.
It is also possible that the limit switch is located in the opener mechanism.
If you can t find it there consult your user manual for reference.
Repeat the same with the down limit in anticlockwise direction.
How to reset garage door opener limit switches.
On certain garage door models the limit switch is located on the tracks.
Measure the height where the door stops while it is being opened.
It should show no connection no continuity or full resistance push on the switch button or push the spring arm to push the button and the meter should show a connection between the two probes.
If it is not closing all the way set the garage door limit switch so that the door goes to the floor.
Use a ladder to get there and get ready to make the necessary adjustments.