[Ming the Merciless]

This same principle applies to the up travel adjustment. Turn the screw towards the increase and the door will open farther. Turning the screw towards the decrease button will have the opposite effect.

Things to remember during this adjustment phase:

One complete turn of the adjustment screw is equivalent to approximately 2 inches of travel.Turning the adjustment screw the direction of the arrow always increases travel. Turning it the opposite of the arrow decreases travel.The motor may overheat and shut off with repeated operation. Simply wait at least 30 minutes and try again.Always test the safety reverse system after adjusting the opener. We recommend repeating this test monthly.
Place a one inch board (or 2 x 4 laid flat) on the floor centered under the garage door. Operate the door in the down direction. The door must reverse on striking the board. If it does not, refer to your owner´s manual, call your LiftMaster Authorized Dealer or speak to one of our technical service representatives by calling the S.O.S. HotLine® at 1-800-528-5880. Failure to pass the above test could result in serious injury or death.

from l m