How To Install a Garage Door Opener

Now, double-check the bottom seal. No gap? No problem. Gaps of more than a 1/4 inch may impact the safety reversal mechanism later on.

Start by placing the rail pieces in a straight line from the center of the garage door. Make sure the first piece has a yellow sticker facing up. This will be important later on.

Add the garage door motor unit at the end of the line and attach the rail pieces together by sliding the tapered ends of each piece into the larger ends. Don't attach the end piece to the motor unit yet. The trolley must go on first.

Grab the trolley and a screwdriver. Put the screwdriver into the second to last rail piece to create a temporary stop. Slide the trolley onto the rail and make sure the release handle is pointing away from the screwdriver towards the motor unit.

Locate the end piece of the rail, the U bracket, and slide it into the garage door opener end of the rail. Attach with a 1/4-20x1 and 3/4-inch bolt. Next, attach the nuts on the top of the unit to the end of the rail. Hand tighten and then use a socket wrench for the final turn.

Next, take the garage door belt to the other end of the rail and feed it through the rectangular window next to the yellow sticker. Insert the idler pulley into the slot and secure with a bolt and washer. A socket wrench is a great way to finish it off.

Bring the rest of the belt to the other end of the rail and wrap it around the sprocket. Make sure the rib side of the belt is facing in. Even out the rest of the length before hooking it onto the trolley.

Now take the shaft and thread it through the other end of the trolley. Attach the spring trolley nut with a few twists. Next, use the master link hardware to connect one end of the shaft to the other end of the belt. It's helpful to use a flathead screwdriver to lock in the final piece above the master link.

This next part is a little tricky, so put on safety glasses and take your time. First, if there's any slack in the belt, twist the spring trolley nut to increase the tension. Finger-tighten only. Insert a flathead screwdriver into the slot in the nut ring. As you hold the nut ring in place with the flathead, slowly rotate the nut on the other end with the wrench. The spring will jump into place, releasing the nut ring against the trolley. Check the tension of the belt again. If it's still too loose, tighten the spring trolley nut a bit more. Now you can remove the screwdriver.

Lift and bend the tab near the yellow sticker to 90 degrees. This will lock the rail sections together. Next, take out the bolts from the top of the motor unit and use them to secure the belt cap retainer over the sprocket.

Since this is a replacement, the header and support brackets are already in place. For first time installs, follow the manual for additional steps. Grab a ladder to support the motor. Lift it into place. Set the rail near the header bracket and then pin it on and lock it in with the ring.

Next, we'll connect the brackets to the garage door motor. Adjust the support brackets so they're the correct width for the new garage door opener. Then check the height. You'll need at least half an inch of clearance between the door and the rail. Now, close the door and secure the motor unit to the bracket at the proper width and height. Then install the light bulbs.

Now, install the emergency release rope. The handle should be at least 6 feet above the ground to avoid contact with vehicles.

Screw in the white wire to the white circuit and the red wire to the red circuit. The panel must be mounted inside of the garage door and at least 5 feet above the floor. This will keep it out of reach for kids and pets. Don't forget to post the warning labels near the control panel and on the inside of the garage door.

With the motor unplugged, pop off the side panel, connect the battery wires and screw the panel back on. With the motor still unplugged, use the garage door opener remote to test out the battery.

This system uses two sensors mounted low on each side of the door that detect pets or objects and stops the door from closing. This is an important safety feature. Reconnect the existing wiring by pressing the terminal tabs with a small flathead screwdriver and matching the wires red to red, white to white and the sensor wire into the gray terminal.

Plug in the opener, then check the safety sensors. One should show a solid amber light and the other solid green. If the green light blinks, loosen the wing nut and adjust it until it's solid.

Once you're done with that, it's time to test the safety reversal system. Place a spare piece of wood under the garage door where it'll close. It should stop and reopen once it makes contact with the wood. Now, try it with something that moves, like a ball. If either test fails, reset the open and close settings. Double check that the door is fully closed when you set the down position. After that, your garage door opener should be ready to use.