Fixing an automatic door closer that fails to pull a heavy door completely shut involves adjusting the hydraulic fluid valves, spring tension, or latch speed screws. Most standard hydraulic door closers feature adjustment valves labeled 'S' (sweep speed) and 'L' (latch speed) on the housing body. Using a small hex wrench or flathead screwdriver, turn the adjustment screws clockwise or counterclockwise according to your manufacturer instructions to increase closing power. You can troubleshoot door closers easily by observing the swing cycle. You can verify that your corrective action is successful when opening the door and letting it go causes the hydraulic arm to sweep smoothly and snap the door firmly shut into its frame strike plate without slamming.
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