How to Adjust a Garage Door Chain

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Knowing how to adjust a garage door chain is a crucial part of ensuring the system works effectively. A chain that’s either too tight or too loose may result in sprocket noise. To achieve proper tension, be sure to release the door from the opener before making any adjustments. A properly adjusted chain will be above the base of the rail at its midpoint, at ½ inch (for T-Rail) or ¼ inch (for Square Rail). However, before rolling up your sleeves to make any adjustments, it’s important to take several safety precautions. To prevent serious injury or death from a moving garage door or gate:
- Activate the door or gate only when the door is properly adjusted, you have a clear vision, and there are no obstructions to door travel.
- Always keep remote controls out of reach of children. Children should never be allowed to play with or operate remote control transmitters.
- Always keep the garage door or gate in sight until it’s completely closed. You should never permit anyone to cross the path of a moving garage door or gate.
How to Adjust a Garage Door Chain
- Use the door button or remote controller to run the opener closed
- Disconnect the garage door from the garage door opener so that you’re able to open and close the door by hand. If your garage door has a T-rail opener, pull the manual release rope downwards and then back to the motor unit. Alternatively, if you’re dealing with a square rail opener, pull the manual release downwards.
- The tension of the chain is adjusted using two nuts and a threaded shaft typically found on the inner trolley. If you’re on the inner side of the garage facing out, you’ll find the adjustment nuts on the left-hand side of the rail. Start by loosening the nut closest to the garage door until the chain drops below the base of the rail, then loosen the other nut to give room for the chain to be tightened.
- Tighten the other nut to add tension. Every turn of the other nut will raise the chain slightly. Keep adjusting the nut until the chain is at its midpoint, which is approximately ½ inch for T-rail and ¼ inch for Square Rail. Now the chain is adjusted correctly, and you should secure the adjustment by tightening the nut closest to the motor.

After making any adjustments, you must test the safety reversal system to check if it’s working as it should. Once you re-engage the door, you may notice some chain droop when the door is in the closed position. That’s perfectly normal. If the chain returns to the correct position with the door in the open position, then there’s no need to re-adjust it.
In Conclusion
Common problems associated with garage door systems stem from the chain losing its tension. However, whether your garage door chain is too tight or has lost its tension, you can use the steps mentioned to adjust it back to normal. Knowing how to adjust a garage door chain will help keep your garage door system functioning as best as possible, while also preventing possible damage.


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