Always place the 2 Allen screws at the back of the gear box so the open front faces you.
Step 1: Start by letting the spring unload itself
Step 2: Loosen mechanical stop on the spindle and side away from gearbox.
Step 4: Turn clockwise for this application (RHR or Left Hand Push) about 180
This amount of rotation provides a pre-load for about 11-15 lbf of force on a 36" door when opened manually.
*You can add more rotation if needed to close in a windy or high stack pressure application*
**You can also decrease rotation for interior application or easier to open manual door**
Do this in small increments of 30 at a time to achieve a higher/lower pre-load to close the door.
In example above: relocate un-sprung mechanical stop at 2 o'clock, 1 o'clock, or 12 o'clock for more manual closing force
For less force and easier to open manually start at 4 o'clock/30 less
Generally acceptable range is 150 to 270
To Next Page
Loading...