Nabco GT-710, Installation Manual

5 of 26

www.NabcoEntrances.com 

GT 710-8710 OPUS Low Energy Swing Doors Quick Set-Up and Parts Guide

Rev 12-20-17 

P/N C-00178

Note: It may be necessary to remove the Motor/Operator from the Header to reduce weight, while positioning the Header onto 

the Door Frame.

1. Remove the Header Cover. Remove boxes and/or parts bags from inside Header. Set aside.

DN 1089

Cover in Closed Posi on

Swing

UP

to Open

Li  UP to 

Pull out 

Remove Screws

GT 8710 Header

GT 710 Header

Figure 2 

Remove Cover from Header

SECTION 4 .1: Drill Holes in Header (GT8710)

FOR GT710 UNITS SKIP TO 

SECTION 4.2

Note: Protect Header Components from metal chips when drilling.

1. Go to the Strike side of Header. Drill one 7/8 inch hole through the Header to allow all wiring to be drawn inside.

a.  The GT-8710 Header can be ordered with a Knockout hole located at either end of the Header. For details, please call 

Customer Service at 1-888-679-3319.

b.  For Simultaneous Pair Swing Doors, it is acceptable to drill a 7/8 inch hole in the back of the header.

2. Go to the back wall inside Header on the Pivot side.
3. Measure 1 inch from the End Cap of Header towards the center. Mark a Vertical Line.
4. Measure at least 1/2 inch from the bottom of Header towards the top. Mark a Horizontal Line across the Vertical line. This is 

the center of the first screw hole. Drill 1/4 inch screw hole.

5. Mark (1) more Horizontal line across the Vertical line directly above the first screw hole. This is the center of the second 

screw hole. Drill 1/4 inch screw hole. Go to the Strike side of Header. Repeat steps 3 thru 

5

.

DN 1086

Pivot side of Header

1/4” Screw holes

1”

at least

1/2”

Figure 3 

Drill 1/4” Screw holes on both sides of Header

SECTION 4 .2: Prepare the Door Frame

Note: The following instructions are for typical Metal Doors and Frame Profile. It is recommended to use lag bolts.
Note: If the Door Frame is not properly reinforced nor anchored to the building surface, and/or is hollow, reinforce the Door 

Frame with 1/4-20 blind rivnuts (not provided by NABCO).

Note: If the Door Frame is not Metal, ensure the Door Frame being used is of equal strength.
Note: Spindle location is very important when measuring from the Door Jamb.

1. Go to the Pivot Side of Swing door. 
2. Measure up from the top of door to the face of Top door frame:

X

GT 710: 1/8 inch 

X

GT 8710: 1-1/8 inch

3. Mark a Horizontal Line on the face of Top door frame, at both ends.