How to adjust up and down travel
SOURCE: changed gear box in craftsman garage door opener
you did not give enough info. If it closes completely and right away goes up, if bulb blinking. if it is, something on door is blocking safety beam. If light is not blinking, DECREASE down travel.
SOURCE: Craftsman 1/2hp garage door opener does not go down to floor
I'm no expert, but on a previous door opener I had (don't know the brand), the side adjusting screw basically adjusted a limit switch, which was located inside the plastic housing (where the motor is). I was able to remove the housing, figure out which limit switch was actually being contacted "too soon" on the way down and adjusted it while watching it.
Just a suggestion, you might take a look.
just keep your hands out of the way of the chain and sprocket if you do take the housing off. .
SOURCE: Can the travel limits on a Chamberlain security+ be reset?
If you are at the back of the operator looking toward the door the limit adjustment should be on the left hand side.
The adjustment closest to the door is the down limit turn that 3 turns clockwise. The adjustment screw furthest from the door is the up limit turn this screw 3 turns counterclockwise. That should get you close to factor settings. If this does not work; remove the cover on the operator sometimes the limit assy. come apart.
SOURCE: Stanley garage door opener chain screw adjustment
THE ADJUSTMENT IS SUPPOSED TO HAVE A 2ND NUT THE TWO TIGHTEN AGAINST EACH OTHER AND ACT LIKE A LOCK
SOURCE: Garage door closes and then automatically opens half way
ADJUST THE DOWN LIMIT IT THINKS THERE IS AN OBSTRUCTION AND IS REVERSING LIKE IT SHOULD.
TURN THE LIMIT ABOUT 1/4 TURN AT A TIME.
HOPE THIS HELPS
The
force adjustments control the pressure used to open and close the
door. A new garage door opener from the factory is set to the lowest
possible force adjustment. If you have a properly balanced door, the
forces required to open and close the door should be minimal.
The
force adjustments are usually located on the rear of the garage door
opener and/or under one of the light lenses, If your opener has two
lights. If you have lights on the side of your opener, the force
adjustment will be located under the right light lens. The force
adjustments are labeled with an arrow indicating open or close and
numbered 1 to 9, with one being the lowest force and nine the
highest. The force adjustments can only turn 260 degrees, or ¾ of a
complete turn. Changes to the forces should be done in 10-degree
increments. Please remember that too much force will interfere with
the proper operation of the safety reversal system. Do not increase
the force beyond the minimum required to close the door. Do not use
the force adjustments to compensate for a sticking, binding, or
unbalanced door.
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