How to Maintain Garage Door Openers

Chain drive garage door openers may have their drive chain loosen over time.
If the drive chain sags more than 1/2-inch below the rail, it may bang against the rail and wear out the drive sprocket. To fix a sagging chain, adjust the chain’s tension.

• Close the garage door.
• Disconnect the garage door opener by pulling the release handle
  in the direction away from the door. (This handle is usually a red cord hanging from the opener.)
• Locate the adjustment bolt on the opener’s turnbuckle. This bolt will have nuts on either side of it.
• Using two wrenches, loosen the chain nut closest to the opener and tighten the other chain nut. This will tighten the chain.
• Tighten the chain until it rests 1/4-inch to a 1/2-inch above the base of the rail. Be careful not to over-tighten, since this could cause the chain to break. The chain should be tight but still flexible.
• Pull the opener’s release handle toward the garage door to reconnect it.
• Manually open the door until you hear a click. This is the carriage reconnecting to the turnbuckle.
• Test the door by closing it with the opener.
• The method of adjusting the chain may vary depending on the manufacturer of your opener.

If your garage
door won’t open or close
fully, try
adjusting the limit screws.

• Close the garage door and unplug the garage door
  opener.
• To adjust how far up the garage door opens, locate the up-limit adjustment screw on the power unit. Use a screwdriver to turn the screw clockwise.
• To adjust how far down the garage door closes, locate the down-limit adjustment screw. Turn the screw clockwise.
• Plug in the opener, run it through a cycle, and see if you need to adjust the screws more. To undo what you’ve changed, simply turn the screws counterclockwise.
• Test the safety reversal system after making adjustments.

Safety reverse sensors are the two
light-beam devices near the bottom of the door. If something breaks the beam while the door is closing, the sensor reverses the door. Sometimes, the beams can get out of alignment.

• Typically, the sensors will have lights that indicate they’re in alignment with one another.
• Make sure the sensors face each other across the garage door opening so they function properly.
• Test the sensors by closing the garage door and passing a broom in
  and out of the door’s path. If the sensors are aligned correctly, the door should reverse.

Tip: If your garage door opener doesn’t have a safety reversal system, whether mechanical or light-beam sensors, then it’s time to replace the opener with a newer model.

Clean and lubricate the drive chain of the opener once or twice a year.

• Use a
  light penetrating oil
  lubricant instead of grease to keep from collecting dirt and grit.
• While you’re cleaning the drive chain, also clean any debris from the garage door tracks.
  If the tracks are dirty, they can put undue stress on the opener. Use a carburetor or brake cleaner instead of a lubricant. A lubricant can cause the door to slip out of alignment.