6. How to balance your garage door
STEP ONE: Lift the garage door slowly to test its balance. Bring the door to about half open. Your door should not spring up or drop down. If your door wants to spring up, you likely have too many winds on the spring(s). Likewise, if it's heavy you may not have enough winds on the spring(s). Adjust accordingly.
NOTES: Keep the vice-grips (locking-pliers) attached to the torsion-tube until you are sure the door is not going to spring up with too much force.
If you have a single spring system you must re-clamp the vice-grips on the torsion-tube before loosening the set-screws on the spring. Failure to do so will cause your cables to go slack and the door to go out of adjustment. Double spring systems do not require you to re-clamp the vice-grips because the other attached spring keeps the cables taught.
STEP TWO: Lift your garage door all the way to the open position. It should remain open by itself.
NOTES: If your door won't lift
all the way up easily; do not force it. This is often the result of not enough winds. Forcing it can cause the cables to come off of the cable-drums.
From the outside of your garage door look up at the line on your spring(s). If the line is straight or near straight and the door is not in the open position then you don't have enough winds on your spring(s).
Some garage doors will only open to about 4-6" below the header even when the springs are properly wound.
STEP THREE: If the door is balanced and lifts all the way to the open position, close and open it several times to make sure it is moving freely before reconnecting it to the garage door opener.
STEP FOUR: Re-engage your garage door to the opener. Refer to your openers manual if you have trouble.
NOTES: Many garage door openers have a trolley and carriage system. You will need to line these up before the opener can be re-engaged.