If it fails: the first hour
What the site contact should do before the technician arrives.
- Keep all personnel clear of the door opening
- Do not attempt to force the door open or closed manually
- Block the opening with a barricade or vehicle if it will not close
- Call for emergency service and note the door model and approximate age if known
What fails
What a service call includes
- Diagnose spring, cable, track, or opener as the source of the failure before repair
- Replace torsion or extension springs matched to the door weight and cycle rating
- Replace worn cables, rollers, and hinges as a set to keep the door balanced
- Realign or replace bent track sections
- Recalibrate opener limit switches and force settings
- Realign or replace photo-eye safety sensors
- Replace weather seals, astragals, and dock bumpers
- Balance-test the door manually after any spring or cable work
Preventive checklist
The items a maintenance program should carry for this system. Build a combined checklist across systems with the checklist builder.
Quarterly
- Lubricate rollers
- hinges
- and torsion spring
- Check cable fraying at the drum
- Test photo-eye alignment and reversal function
- Inspect dock bumpers and levelers for damage
Annual
- Full spring tension and cycle-life assessment
- Opener force and limit switch calibration
- Track alignment check under load
- Weather seal replacement if cracked or compressed
What it costs
| item | typical range | what moves it |
|---|---|---|
| Torsion spring replacement | $250 to $600 | Higher for high-cycle commercial springs or doors requiring two springs. |
| Cable and roller replacement | $150 to $400 | Usually done as a set to keep the door balanced. |
| Opener motor repair or replacement | $400 to $1,200 | Depends on horsepower and whether it is a chain, belt, or direct-drive commercial operator. |
| Track realignment or section replacement | $200 to $700 | Cost rises significantly if the track was bent by a vehicle strike and needs new hardware. |
| Dock bumper and seal replacement | $150 to $500 | Varies with dock height and whether the leveler itself needs service. |
National ranges. Local labor, access, after-hours timing and materials move them. Multi-site programs usually price below one-off calls.
When this is an emergency
A door stuck open at a loading dock or entry point, or a broken spring that leaves a heavy door unsupported, counts as an emergency due to security and safety risk.
How to choose a provider
- Ask whether the technician carries springs rated for commercial cycle counts, not residential-grade parts
- Confirm they service both the door and the electric opener, since problems often involve both
- Ask about dock leveler and bumper service if the door is part of a loading dock
- Get a written cycle-life estimate for springs so replacement can be scheduled before failure
- Ask about emergency response time for a door stuck open overnight
Questions
Why did the spring break with no warning?
Torsion springs are rated for a set number of open-close cycles. They weaken gradually and then fail suddenly, usually without visible signs beforehand.
Is it safe to operate a garage door with a broken spring?
No. Without spring tension the door is too heavy for the opener or a person to lift safely, and forcing it risks damage to the opener or injury.
Why does the door reverse before it fully closes?
This is almost always a misaligned or dirty photo-eye sensor reading a false obstruction, though a binding track can also cause it.
How long do commercial dock doors typically last?
Life depends heavily on cycle count and impact damage rather than age alone. A low-traffic door can last many years longer than a high-cycle dock door of the same age.