This is related to the up limit switch.
Garage door opener rail bounces.
When you open the door some of that energy returns in the form of a rebound.
Liftmaster provides a helpful resource that explains how to adjust a limit switch.
The door should go up down with about equal force required no stops drags catches.
Place a level on these and the rail to check to see if they are level.
With the door closed grasp the carriage with the door attached and raise the door.
See if the carriage travels the length of the rail without fail.
Since then the garage door was intermittently bouncing when garage door bounces when closing at half way mark opener springs paint house remodeling decorating construction energy use kitchen bathroom bedroom building rooms city data forum.
Any tips on how to correct this.
It s important to get this switch at just the right distance from the motor so that the door is able to close all the way but the motor also knows to stop running.
My chamberlain garage door opener rail flexes.
If you stop the door in mid travel it should stay where you stop.
Also be sure the inside slide lock hasnt been nudged out and is catching the track.
To force the door on to the garage floor.
That is the jerk you see.
If your garage door isn t staying open or staying closed you may need to adjust your limit switch which requires only a flathead screwdriver.
Check the door operation with the opener disconnected at the emergency pull.
Remove the opener j arm from the carriage close the door completely.
Also the garage door slides along two door rails on either side of the garage.
Look for anything binding.
If you look at the rail you can see it flex bend up.
T his is a pretty uncommon problem but one that can happen after you ve first installed your garage door opener.
Watch the opener carefully as it closes the door.
Some problems are associated with the actual installation of the garage door opener.
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If this doesnt bring anything to light re attach the j arm to the carriage and be the opener.