LCN 1371 and NDC Pivot #101 Installation

Floor closer conversion & surface mounted door closer is installed.


I was invited to what became the conversion of a floor closer to a floor pivot and the installation of a surface-mount door closer onto a narrow stile aluminum glass storefront door. The door had been having problems almost since construction. The floor closer was incorrectly installed, having almost no clearance at the pivot edge of the door at the closer. The arc cut into the cement floor was deep, another indication of this long term problem. In addition, the door was loose from the closer arm. The reason this door was not repaired sooner was that it is one of more than eight doors that could be used to gain entry into the building.

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Once the door had been removed, the floor closer was tested and it did not have sufficient force to properly close the door. At this point, a decision was made to install the National Door Controls neutralizer kit for offset floor closers and the LCN Quest surface-mounted door closer. The top-mount door stop would provide the mechanical stop for this door.

To remove the door from the jamb:

Step 1. Remove the overhead stop from the door and the header using a Phillips head screwdriver.

Step 2. Remove the cover from the offset closer using a Phillips head screwdriver.

Step 3. Loosen the arm using a 3/4” wrench.

Step 4. Remove the center pivot using a Phillips head screwdriver. The top pivot is left to be removed last as it will stabilize the door.

Step 5. Open the door 90 degrees. This should hold the door in place until you are ready to remove the door.

Step 6. Remove the top pivot screws.

Step 7. Tilt the door just out from under the header in order to remove the two halves of the top pivot.

Step 8. Tap the pivot side of the door to disengage the arm from the shaft. An alternative method is to use a small crow bar to lift the door at the pivot edge until the arm is off the shaft.

For this installation, the arm remained attached to the shaft while becoming disconnected from the bottom of the door.

Step 9. Walk the door away from the shaft. Carefully lay the door on its side in order to check the operation of the floor closer.

The next series of steps is to convert the floor closer to a bottom pivot and install the new conversion arm onto the bottom of the door. The NDC conversion arm has multiple mounting holes to accommodate a number of different floor closer manufacturers. For this installation the position of the conversion arm was moved back to provide additional space between the bottom of the door and the jamb.

Step 1. Determine the proper position for the NDC conversion arm on the bottom of the door. The desired space between the door and the jamb is approximately 1/8” to 3/16”.

Step 2. Install at least three screws to secure the NDC conversion arm through the space plate onto the bottom of the door. For this installation, four screws were used to secure the arm. To install the four provided self tapping screws, begin with a #7 bit to create the hole. Then use a 1/4-20 Tap or a 1/4-20 TEK screw to create the threads.

Step 3. Place the 7/8” diameter sleeve onto the shaft of the floor closer.

Step 4. Place the spacers onto the floor closer shaft. There are two spacers included. These spacers can be used to raise or lower the door in order to stop scraping.

Step 5. Place the bearing assembly over the sleeve.

Step 6. Place the bearing on top of the assembly with the concave side facing down. The bearing must be seated flat for the conversion arm to properly operate.

Step 7. Carefully install the door, making sure the conversion arm slides over the bearing assembly. Carefully swing the door open to approximately 90 degrees.

Step 8. Install the top pivot onto the door and the header. Test the swing of the door.

Step 9. Install the center pivot. Test the swing of the door.

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