Garage Door Installers & Technicians

A garage door can weigh 150 to several hundred pounds and is held up by springs wound under extreme tension. Installers and technicians have been seriously hurt by springs that released, cables that snapped, panels that fell, fingers pinched in joints, and falls from ladders. Most of these injuries follow the same few mistakes.

• Garage Door Installers
• Service Technicians
• Dock Door Crews
• Handymen & Property Maintenance

Main hazards

• Torsion and extension springs: stored energy can release violently if a winding bar slips, a spring breaks, or a bracket or cable fails.
• Bottom bracket and cable tension: loosening a bottom bracket while the door is spring-loaded can launch it, and cables snap under load.
• Falling doors and panels: a door can fall if a cable, track or hinge fails, or if panels are not supported while working on them.
• Pinch and crush points: hinges, panel joints, tracks and rollers.
• Falls from ladders when working on tracks, springs and openers at height. See Ladder Basics.
• Electrical hazards: opener wiring, controls and sensors. See Lockout/Tagout.
• Cuts, eye injuries and lifting strain from sharp panel edges, drilling and carrying heavy sections. See Lifting & Ergonomics.
• Public and customers: children, pets and vehicles near the work area.

Spring and cable safety

• Only trained technicians should adjust or replace springs. Follow the manufacturer's instructions for the exact spring size, length and number of turns; the wrong spring is dangerous.
• Use proper winding bars that fit the winding cone snugly, never screwdrivers or rebar, and keep your body out of the line of the bars. Stay to the side of the spring.
• Secure the door in the fully open position with locking pliers or clamps on the track, and block or clamp it so it can't fall, before releasing spring tension or removing parts.
• Release tension before removing the bottom bracket or cables, following the maker's procedure, and never loosen the set screws on a wound spring beyond the safe procedure.
• Replace springs in pairs where the maker advises, and replace worn cables, drums and brackets, not just the broken part.
• Wear safety glasses and gloves, and use stable ladders. See Eye & Face Protection.

Installing and balancing doors

• Work with a helper for panels and stack panels carefully so they can't tip. Carry sections by the edges with gloves.
• Use the installation manual and the correct fasteners for the building structure. Check that the header and jambs are solid.
• Install track, hinges and rollers exactly as the manual says. Keep fingers away from hinge joints when raising panels.
• Balance the door only after springs are installed and set properly. A balanced door stays about half open when released. An unbalanced door is a hazard and overworks the opener.
• Install the opener with the correct wall and ceiling supports, and connect the manual release rope so it's reachable but safe. See Overhead & Loading Dock Doors.

Openers, sensors and testing

• Install photo-eye sensors about 4 to 6 inches above the floor, aligned, and test them. Openers sold in the U.S. must have entrapment protection; confirm the auto-reverse works on contact and when the beam is blocked.
• Mount the wall control button at least 5 feet above the floor, out of reach of small children and in sight of the door, and tell customers not to let children play with remotes.
• Lock out power before working on the opener wiring. Don't bypass limit or force settings to make a damaged door work.
• Test the door in front of the customer and explain the manual release, locks and safe use. Leave manuals with them.
• Use GFCI protection for corded tools and watch overhead and attic wiring. See GFCI Protection.

Customers and the work area

• Keep children, pets and bystanders away from the work area and parked vehicles away from the door path.
• Tell customers not to try DIY spring repairs. Take unsafe doors out of service, tag them, and explain why. See Garage Door Safety.
• Handle old springs and parts carefully, and recycle metal. Wear gloves for sharp edges.

Garage door technician checklist

• I'm trained and use the correct winding bars; I stand out of the line of the bars
• The door is clamped open before I release spring tension or remove brackets
• Springs, cables and drums match the maker's specifications
• Sensors, auto-reverse and the manual release were tested
• I wear eye protection and gloves, use stable ladders and keep customers back

Last updated: October 5, 2026