How closed the door closer
The side of the door closers has a screw to control the size of the oil or return air, do not screw too much! Will leak!
The speed is too fast is too loose screws, need to adjust the clockwise, you can slowly debug.
Now the door closer product market chaos, cheap and difficult to guarantee the quality and service life. Can be self-adjusting the side door screws tight, too loose will leak! If not only timely replacement.
There are two control valve, 1 is to adjust the closing speed, 2 is to adjust the lock door speed, to spin (clockwise) is slow. With a small screwdriver can be adjusted, adjust the time do not spin too much, this is very sensitive, just adjust a little on the line.
