Before enlarging the holes in the jamb, a small diameter masonry bit drilled up into the opening to remove some concrete. The locksmith wore a disposable dust mask to protect himself.
Then self reaming and tapping screws were used to enlarge and thread the holes in the jamb. The self reaming and tapping screws were used to just drill and tap the jamb. A larger masonry bit, smaller than the opening created by the self reaming and tapping screw, was used to remove additional concrete in order to install the shoe. Self reaming and tapping type screws are not designed to drill out concrete.
Before mounting the closer onto the door, the valve on the rear of the closer body was closed by turning the hex screw clockwise. This valve controls the position the backcheck function begins to engage.
The closer body was installed onto the door using the four sex bolts. If the holes are slightly out of alignment, try using a long, narrow blade screwdriver to reposition the threaded opening in the sex bolt. Depending upon the content or absence of content in the door cavity, it may be a good idea to use a thread adhesive to secure the mating screws to the sex bolts. Because of the re-enforcement within the door cavity, the four mating screws could be tightened and not alter the shape of the door.
Once the closer body has been installed onto the door, the pinion must be pre-loaded to accommodate the splining in the arm. Attach a wrench or pliers onto the lower end of the pinion. Rotate the pinion clockwise approximately thirty degrees to align the arm opening with the pinion teeth. Once aligned, use a rawhide or rubber mallet to tap the arm onto the pinion. Install the Phillips Head pinion screw.
The next step is to test the operation of the door closer. Open the door at least 90 degrees and permit it to close. Repeat this several times. If the door does not latch or closes very slowly, there is a power adjustment on the end of the 4040XP closer.
Note: Depending upon the location of the door, the closer may be required to accommodate Americans with Disabilities Act requirements.
There are four adjustment set screws on the 4040XP Closer closing power adjustment, backcheck, main (sweep) speed and the latch speed. To increase the closing power, adjust the 5/32” hex screw clockwise. A patented plastic power indicator was attached to the spring tube of the closer body. The default setting was “3”, sufficient spring power to close and latch the door.
The closing time for standard applications is approximately five to seven seconds. About three to four seconds for sweep and three seconds for latch. To increase the sweep speed or the latch speed, turn the 3/32” hex screw on the front of the closer counterclockwise. See the drawing on the tube of the closer to determine the locations for adjustment. Make the necessary adjustments. Keep in mind that the spring adjustment controls the closing force. The regulating valves control the closing speed.
The final adjustment is the backcheck. The purpose of the backcheck is to slow the opening force before the closer reaches maximum opening. To slow the opening force the backcheck can adjust the amount of fluid movement as the door reaches maximum opening.
IMPORTANT: The Spring Cush Arm function does not replace the backcheck. Do not weaken or completely loosen the backcheck setting on the door closer. The Cush functions with the backcheck to slow and stop the door opening.
For this installation, the door closer is equipped with the Spring Cush Arm. This type of arm has a contact block assembly screwed onto the shoe. The handing of the door determines the position of this assembly. As the door is opened, the arm swings under the shoe and the backcheck begins to slow the doors opening.
The contact block assembly mounts beneath the shoe, in the path of the arm. When the door swing is within approximately 10 degrees of the installed opening, the arm contacts the block. As the door continues to open, the arm presses against the block, which moves against spring pressure, further slowing the opening of the door until the block stops the arm from moving.
The LCN 4040XP is the second generation heavy duty door closer designed to withstand even more rigorous applications.