wuxi newton technology garage door

Garage door regular maintenance

Garage door maintenance

Part one


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Garage door maintenance purpose:


Learning how to maintain a residential garage door is key to keeping it operating efficiently. A malfunction can prevent you from taking your car out of the garage when you want to. Regular maintenance twice a year can make such mishaps less likely. This guide reviews the basics of garage door maintenance, including inspection, lubrication and simple replacement projects.

Garage door maintenance step:


  • Inspect the door

Inspect the garage door operation about twice a year. Is it louder than usual? Does it operate with a smooth or jerky motion? Do the parts appear to be in even alignment?

Before you perform routine maintenance, gather the tools you’ll need, including brake cleaner, safety glasses and various garage door parts.

Tip: Unplug the automatic door opener before doing preventative maintenance. If working with the door up, affix a clamp on the track under one of the rollers to prevent the door from slipping down.

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  • Perform safety tests

Perform these safety tests on your garage door system and contact a professional for repairs if the door fails any of them.

Garage door balance:

  • Disconnect the garage door from the opener so that it operates manually.
  • Lift the door about halfway up, then release it.
  • The door should remain in place; if it slips down, the door isn’t balanced. Call a service technician.

Mechanical reverse feature:

  • Place a piece of wood or a brick on the garage floor in the path of the door.
  • Activate the garage door to close.
  • When the door contacts the block, it should reverse direction. If it does not, call a technician.

Door photocell:

  • Locate the two photo sensors at the base of the garage door.
  • Check the alignment of the sensors; they will light up when they are properly aligned. Adjust as needed.
  • Activate the garage door. As it closes, wave an object across the sensor path. The door should immediately reverse.
  • Test at least three different points in the beam’s path.

Tip: Garage door openers over 20 years old may lack safety features such as these and may need an upgrade.


    • Examine garage door hardware

    The garage door hardware needs periodic inspection for signs of wear and tear.

    • Check the garage door tracks and hinges. Use a socket wrench or screwdriver as needed to tighten any loose bolts or fasteners on moving parts.
    • Inspect for wear on any garage door rollers that are not attached to the lift cable system. Steel rollers will show worn bearings and may look lopsided, while nylon rollers tend to crack as they age. Purchase and install replacement rollers as needed.
    • Look for wear in the lift cables attached to the door. You may notice excessive rust, deterioration or broken strands in the cables. If they look worn, call for service.

    Tip: Do not try to replace garage door cables. They are under high tension and could cause serious injury if not handled by a professional.

    • Service the Chain or Belt

    If you hear groaning or slapping sounds as the door operates, check the drive chain or belt as there may be a little bit of slack.

    • First, disconnect the opener from the power source. Raise the garage door to about chest height, detach it from the opener, and then close it by hand to work on the chain.
    • Locate the adjustment bolt that connects to the chain or belt. There should be nuts on either side to adjust the drive mechanism.
    • Use a wrench to turn the first nut at the side of the assembly counterclockwise. Then, move to the other nut and turn it clockwise. The chain or belt should pick up slack.
    • Tighten until the chain or belt is about a quarter inch from the bottom of the rail. Do not overtighten as it could lead to a break.
    • Reattach the door to the opener and reconnect the opener to the power supply.

    Properly using garage door lubricant helps stave off corrosion in the metal parts. Some screw openers do not require lubrication, so be sure to read the manufacturer’s recommendations first. Lubricate the chain or screw with a spray application of white lithium grease.

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    • Service the seals and springs

    The garage door seal at the bottom of the door — also called a weather seal or U-shaped astragal — protects the garage from the elements and prevents vermin and snakes from creeping in under the door. The seal should be replaced if it seems brittle or worn. The tension in the garage door springs makes it easier to raise and lower the door.

    • Detach the garage door from the opener so that it operates manually.
    • Raise the garage door to about chest height. Secure a clamp over the track under the roller to keep the door in place while you work.
    • Use a screwdriver or pry bar to unseat the old weather stripping from the channel at the bottom of the door.
    • Once loosened, the weather strip should slide out if you pull a free end from the side of the garage door.
    • Clean the door groove to be free of any debris. Then, slide a new piece of weather seal into the door groove.
    • If the weather seal has trouble sliding into place, pull it all the way back out and apply penetrating oil to the groove. Then re-insert the new weather seal strip.
    • Trim the weather strip to about four inches beyond the door edge. Slide the strip to the left, fold the overage back in on itself, then slide back into the door groove.
    • Spray the overhead torsion or extension garage door springs with penetrating oil. Spray liberally and do not wipe off excess.

    Garage door springs are under high tension, so adjustment or replacement of springs requires extreme care. Consider hiring a garage door maintenance expert if a spring appears broken. Never try to adjust the garage door torsion springs or any bolts that are painted red or otherwise identified as requiring service by a professional only.

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