Door Balance Testing
Testing and evaluating overhead door spring balance for safe operation
Warnings
A severely unbalanced door (one that drops rapidly or rises on its own) indicates a spring problem. Do not attempt to repair springs without proper training and tools.
Stand to the side of the door when releasing it at the halfway point — not directly in front or behind.
If the door is equipped with an operator, you must disconnect it before performing a manual balance test.
Required PPE
- Safety glasses
- Leather gloves
- Steel-toed boots
Tools Required
- None required (manual test)
Procedure — 5 Steps
Step 1
Disconnect the Operator
If the door is equipped with an operator, you must disconnect it before performing a manual balance test.
Disconnect power to the automatic operator. Pull the emergency release handle to disengage the trolley from the door. The door should now move freely by hand.
Pro Tips
- Kill power at the wall or unplug the operator before pulling the release, so the motor cannot drive the door while it is disengaged.
- Pull the emergency release only with the door fully closed — releasing a partially open door lets it drop under its own weight.
- After releasing, gently rock the door a few inches by hand to confirm the trolley is fully disengaged and the door truly moves freely.
- If the release cord is missing or the trolley will not disengage, stop and correct that before attempting the balance test.
Checklist
Training Videos
Disclaimer: These videos are produced by third-party YouTube channels and are not affiliated with Doorbot. Video content may not align exactly with the procedures above, may depict techniques that differ from DASMA or manufacturer recommendations, and may show tasks that are dangerous if performed without proper training and equipment. Always follow the written procedure, your company's safety policies, and applicable industry standards. Use these videos as supplementary reference only.