If the door is 8 ft.
Is garage door opener rail supposed to be level.
Do not position the opener more than 4 10 cm above this point.
Some modern chain drive garage door openers such as liftmaster s premium series 8360 model have dc motors that make their noise levels much quieter.
Normally it s only about an inch or so.
This page has a link to the complete door opener manual.
Every opener i ve ever seen or installed has a slight slope from the end of the rail back to the motor.
When it is resting on the ground the door establishes where the tracks should be.
A 2x4 laid flat is convenient for setting an ideal door to rail distance.
More or less of a gap is ok as long as there is no heavy rubbing.
A 2x4 laid flat is convenient for setting an ideal door to rail distance.
The instructions then state to open the door all the way up and lay a 2x4 down flat on the door to set the clearance when mounting the main.
The top of the door should be level with the top of the motor unit.
I ready to mount the main unit to the ceiling.
The instructions show the header bracket located above the door opening mounted with a 2 inch clearance from the highest point of a sectional door.
Do not position the opener more than 4 10 cm above this point.
4 retighten the track brackets.
Tall an additional 8 9 of vertical headroom would be needed.
If they aren t the door will not open and close properly potentially leading to unwanted gaps panel buckling or door binding.
With the door open there should be about a 1 to 2 inch gap between the door and rail.
Adjusting the garage door track margins keeps the track properly aligned with the door itself.
The top of the door should be level with the top of the motor unit.
In order for your garage door to function as intended your tracks need to be perfectly level.
In the configuration only a vertical track is needed and the door moves up and bumps out from the wall only enough to accommodate the opener.
I m installing a craftsman electric garage door opener.
Garage door openers have.
A chain much like a bicycle chain is attached to a trolley that runs along a rail.
In order to fix this you ll want to make small changes to the close limit setting until the door opener knows to stop once the door has reached the floor.
You want the tracks to be parallel with the door and have a consistent margin for the full height of the door.
The liftmaster model 3280.
If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch.