Remove the opener j arm from the carriage close the door completely.
Garage door opener rail bounces.
My chamberlain garage door opener rail flexes.
The door should go up down with about equal force required no stops drags catches.
That is the jerk you see.
Also be sure the inside slide lock hasnt been nudged out and is catching the track.
If you look at the rail you can see it flex bend up.
This is related to the up limit switch.
If you stop the door in mid travel it should stay where you stop.
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Try making small adjustments.
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.
If this doesnt bring anything to light re attach the j arm to the carriage and be the 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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With the door closed grasp the carriage with the door attached and raise the door.
If the rail system is not perfectly level the chain can eventually bind up in the process of working the door.
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.
Place a level on these and the rail to check to see if they are level.
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.
See if the carriage travels the length of the rail without fail.
Check the door operation with the opener disconnected at the emergency pull.
Liftmaster provides a helpful resource that explains how to adjust a limit switch.
To force the door on to the garage floor.
Any tips on how to correct this.
Also the garage door slides along two door rails on either side of the garage.