Take a look at this video with sound on. This door closer, a Dynasty 2000, works great and is quiet except in the instant that opening force is released and the door starts slowly closing. It seems like the lack of tension allows the arm to jerk downward, making a loud noise. Then the arm goes back up and the door closes properly.
Any idea how to make it stop slamming downward? I tried adding a flat washer inside the bracket on the wall, as well as squeezing tighter with pliers the bracket closed in order to allow less play--however, I gather that there is supposed to be play in the arm, and my efforts made little difference.