To adjust the tension on a Genie chain-drive garage door opener, locate the threaded tension adjustment bolt and nut assembly on the trolley slider or at the front idler pulley bracket near the door wall. Use a wrench to tighten or loosen the adjustment nuts to achieve the recommended manufacturer slack (about 1/2 inch to 1 inch of sag above the center of the rail). Callout type="warning" title="Safety Warning": Unplug the garage door opener before working on tension bolts or mechanical rails. Verification: Measure the sag distance above the rail midpoint to ensure it falls within the 1/2 to 1-inch tolerance.
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