Symptoms of Loose Arm Locking Screw Door will not fully close. Door will slam just before closing. Door will have little or no control in latch speed range. Door will "bounce" back after closing against frame. On hold open models, door will wiggle when in hold open. Door will make a loud popping noise when taken out of hold open.This is one of the most common causes of door control problems and it is very easy to cure. The installation instructions show the method that ensures that the screw is properly tightened.
To properly tighten the arm locking screw, remove the arm cover cap and open the door slightly. While wiggling the door back and forth, tighten the screw with the correct size wrench until it is fully seated on the closer spindle. This allows the arm locking screw to firmly connect the arm to the spindle.
For center hung applications, the door must be removed to access the arm locking screw. Once the door has been removed, tighten the screw securely down through the washer and onto the closer spindle. Once door is rehung, install/tighten arm alignment screws and washers.
For these less common arm applications, the door need not be removed to access the arm locking screws. These arms are firmly affixed to the underside of the door. The door is then banked or slid onto the spindle.With the square block arms, it is important that the screws be tightened at the same time, not one and then another. This will cause the arm to wobble on the spindle, shortening the life of the installation and the arm.