EXCERPT: For adjustment and repair of Door Closers, often used in offices and commercial buildings. Also known as: Mechanical door closer, office door closer, automatic door closer.
For information on pneumatic storm door closers, see this article: Storm Door Closer Maintenance, Repair and Adjustment
Disclaimer: This information may be inaccurate, incomplete, or dangerous. You are responsible for your actions. I caution you to NOT disassemble the main cylinder, your closer may have a strong spring inside that can cause serious injury if an end cap is removed. Continue reading Door Closer Maintenance, Repair and Adjustment Info