Changed opener changed a bad roller measured distance between rails
If the alignment is true and rollers move with ease, you should not have any jerking motion. Unlock the door catch from the pulley line of the motor. The door should be FREE to lift by hand. With the door Free of the motor/line-pulley, lift by hand. Do so a number of times and see if it binds or is free to move up and down easily. If it binds, the alignment is off and needs adjustment. If it moves quite well, then the problem can be the door sensors. These are the two face to face sensing devices at the bottom of the metal guides on both sides. These sensors need to be horizontal and fixed to allow Line Of Site to operate correctly. Check both Alignments, Rails and Sensors.
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