Safety first
Stop using a door that appears unstable, off track, unusually heavy or unable to secure. Do not handle garage-door springs or loose high-tension cables.
Oil leakage often signals internal failure
A visible leak may indicate that the closer has lost hydraulic fluid and can no longer control movement consistently.
Slamming is not always an adjustment issue
An incorrect closer, failed component, binding hinge or poor alignment can contribute to uncontrolled closing.
Failure to latch may involve several parts
Closing speed, latching speed, weather pressure, hinge friction and strike alignment can all affect the final few inches.
Adjustments should not mask a damaged opening
A closer should not be used to force a dragging or misaligned door shut.
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