Garage Door Repair Glossary

This garage door repair glossary is your quick-reference tool to understand the parts and systems in your Newington home’s garage door. Knowing these terms helps you spot small issues early, schedule smart maintenance, and talk confidently with pros—saving you time, money, and headaches down the road.

Whether you’re hearing a strange noise from your overhead door in winter or just want to keep your garage safe and efficient, understanding garage door repair terms puts you in control. Craig & Todd Garage Door Repairs LLC serves Newington and nearby towns like Portsmouth, Dover, and Rochester areas we serve. Need expert help? Contact us for a free estimate free estimate.

Torsion spring

A tightly wound metal spring mounted above the garage door that counterbalances the door’s weight, making it easy to open and close. Torsion springs are safer and last longer than extension springs, but they can snap if worn or improperly adjusted. If yours makes loud bangs or won’t stay open, call a pro immediately—broken torsion springs are dangerous and require expert replacement.

Extension spring

A long spring that stretches along the garage door tracks, helping lift the door by extending and contracting. These springs are mounted on either side of the door and are under high tension, so they can snap unexpectedly. If you see gaps or a spring that’s sagging or rusted, schedule a spring replacement spring replacement before it fails.

Track

The metal rails—usually two vertical and one horizontal—that guide your garage door as it moves up and down. Tracks must stay aligned and free of debris to prevent binding or misalignment. In Newington’s freeze-thaw winters, ice and salt can corrode tracks, so inspect them monthly and clear snow buildup promptly to avoid costly repairs.

Roller

Small wheels attached to the sides of your garage door that roll inside the tracks, supporting the door’s weight and allowing smooth movement. Rollers wear out over time, especially in dusty or humid climates like New Hampshire’s. If you hear grinding or see uneven movement, replacing rollers early prevents damage to tracks and springs.

Opener

The electric motor and drive system that automatically opens and closes your garage door. Modern openers include smart features like Wi-Fi connectivity and battery backup. If your opener is older than 10 years or makes grinding noises, upgrading to a newer model garage door opener upgrades can improve safety and convenience.

Photo-eye sensor

Safety device mounted near the bottom of the garage door frame that detects obstructions in the door’s path. If the beam is broken while the door is closing, the opener reverses immediately to prevent injury or damage. Test your photo-eyes monthly by waving an object in the beam—if they don’t respond, call for repair contact us right away.

Limit switch

A switch inside the garage door opener that tells the motor when to stop moving the door at the fully open or closed position. If the limit is misadjusted, the door may not close fully or could slam shut. Adjusting or replacing a faulty limit switch is a job for professionals to ensure safe operation.

Weatherstripping

The flexible seal along the sides and bottom of your garage door that blocks drafts, moisture, and pests. Over time, weatherstripping cracks or peels, especially in Newington’s wet winters. Replacing worn weatherstripping improves energy efficiency and protects stored items from humidity and cold air.

R-value (insulation)

A measure of how well your garage door’s insulation resists heat flow. Higher R-values mean better insulation, keeping your garage warmer in winter and cooler in summer. If your garage is attached to your home, upgrading to an insulated door insulated garage doors can lower heating bills and reduce noise.

Cable drum

A grooved wheel attached to the torsion spring shaft that winds and unwinds the lift cables as the door opens and closes. If a cable drum is cracked or the cable jumps off, the door can become unbalanced or fall. Never attempt to adjust or replace cable drums yourself—this requires specialized tools and expertise.

Bottom seal

The thick rubber or vinyl strip attached to the bottom edge of your garage door that seals the gap between the door and the driveway. A worn or cracked bottom seal lets water, snow, and pests enter your garage. Replace it every few years or if you notice drafts or water pooling inside.

Travel module

The electronic control board inside your garage door opener that manages the door’s movement, safety sensors, and remote signals. If your opener stops responding to remotes or behaves erratically, a faulty travel module may be the culprit. Our technicians diagnose and replace travel modules quickly to restore reliable operation.

Trolley

The part of the garage door opener that connects the motor to the door, pulling it along the tracks when you press the remote. If the trolley is misaligned or the chain is loose, the door may jerk or stop mid-operation. Regular maintenance checks ensure smooth, quiet travel all year round.

Manual release

A red cord or handle inside your garage that disconnects the door from the opener in case of power failure or emergency. Pulling the manual release lets you open or close the door by hand. Always test it twice a year—especially before winter storms—to ensure it works when you need it most.

Frequently Asked Questions