How Commercial Door Closers Work
Most closers are hydraulic. As the door swings open, the closer stores energy in a spring and controls the return with oil flowing through adjustable valves. That’s why small adjustments can make a big difference — until the closer is worn or leaking.
Symptoms That Usually Need Service
- Door slams (unsafe, noisy): speeds out of adjustment or closer failing
- Door won’t latch: latch speed too slow, closer weak, or frame/strike misalignment
- Oil leak around the closer body/arm: typically requires replacement
- Door is hard to open: spring tension too high, binding hinges, or incorrect closer size
- Door won’t stay closed: closer weak, backcheck mis-set, or draft/stack pressure issues
What Can Be Adjusted (and What Shouldn’t)
Technicians can adjust sweep speed, latch speed, and backcheck on many models. Avoid over-tightening valves — forcing adjustments can damage the closer or cause leaks. If the closer is leaking or the arm is damaged, adjustment won’t solve it.
Fire Doors & Compliance Notes
Many fire-rated doors must self-close and latch. A failing closer can become a compliance issue. If this is a fire door opening, we’ll verify proper closing/latching behavior and help correct deficiencies.
When to Call a Pro
If the door is slamming, leaking, or not securing the opening, call. For scheduled work, see our door closer repair & installation service.