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Commercial Steel Garage Door - OWNERS MANUAL Commercial Steel Garage Door - OWNERS MANUAL
STEP 22:
SHAFT COUPLER:
(SOLID SHAFT ONLY) Install and tighten the three
3/8” x 2” joining bolts (Fig. 32).
STEP 23:
BACK HANG: ALL DOORS EXCEPT
FULL VERTICAL
Use the following to determine your doors back
hang requirements:
STANDARD RADIUS OR LOW HEAD ROOM:
• Doors up to 8’ high - One back hang per side.
• Doors over 8’ high and up to 14’ high - Two
back hangs per side.
• Doors over 20’ wide OR over 14’ high - Three
back hangs per side.
H I L IF T:
• Back of horizontals up to 8’ from header - One
back hang per side.
• Back of horizontals 8’ to 16’ from header - Two
back hangs per side.
• All Doors over 20’ wide - One back hang per
side for every 6’ horizontal track.
Remove the vise grip(s) from the shaft line. While
keeping a good hold on the door (in case the
springs are overwound), remove the clamps holding
the door down. Raise the door approximately half
way up or to the first back hang position and clamp
in place. Ensure that the tracks are level or slightly
up and run parallel with the door with approximately
1/2” clearance between the track and the door.
Back hang the door (See your door types main
illustration for back hang examples.).
NOTE: PUNCHED ANGLE IS AN OPTION FOR
BACK HANG WHICH MUST BE ORDERED IN
ADDITION TO THE DOOR PACKAGE.
STEP 24:
FINAL ITEMS AND ADJUSTMENTS
Choose the final instructions for your application.
WEATHER STRIP:
VINYL WEATHERSTRIP-WOOD JAMB: With the
door closed, check that the door stop is positioned
satisfactorily against the door and nail securely.
PERIMETER SEAL/BRUSH: Install with owner
supplied fasteners (Fig. 39).
TOP SEAL: Install on the top of the top section
with owner supplied fasteners (Fig. 40).
Check that all bolts and screws are tight. If
necessary, lubricate all hinges, bearings, and
rollers with lightweight oil. Make sure all the nails
holding sections to jambs have been removed.
Check that all the protective film has been
removed.
Clean the door as required.
STEP 25:
INSTRUCTIONS AND WARNING LABELS
In the hardware box you have received an
envelope of labels. Place all labels at eye level
after installation of door. Post the Owners Manual
on the jamb near the door. It has valuable
maintenance and warranty information for the
owner.
STEP 26:
OPERATOR INSTALLATION
If installing an operator, install in accordance
with
the manufacturers recommended instructions.
Remove the pull rope and make sure the door
remains unlocked (Remove or disable slide lock).
NOTE: Midland does not recommend using a
jackshaft operator on a standard radius door.
If the installation leaves no other option, the
back of the horizontal tracks must be raised
approximately 4” and-pusher-springs-installed.
Figure 39
Figure 40
STANDARD RADIUS, ROOF PITCH, & LOW
HEAD ROOM: Install 3/8” x 1 1/2” bolts at the rear
end of the horizontal tracks. These prevent the top
section rollers from rolling out the back of the track.
FULL VERTICAL: Install a SWAY BRACE on each
upper vertical track to prevent them from spreading.
Raise the door to its desired full open position,
clamp in place, and install the SPRING BUMPERS
(Fig. 25).
HIGH LIF T: Raise the door to its desired full open
position, clamp in place, and install the SPRING
BUMPERS (Fig. 21).
LOW HEAD ROOM:
TOP FIXTURES: With the door fully closed, final
adjust the top fixtures so the top section fully
closes. Add an additional self tapper in each so
the top fixtures can’t move. If a strut is required
at the top of the section (for doors with a drawbar
operator), install the strut over the top of the top
fixtures (Fig. 28).
ALL DOORS:
Attach the LIFT HANDLE and the INSIDE SLIDE
LOCK to the second section with self tappers
(Fig. 6). The door should work smoothly and easily
throughout its range of operation. Adjust spring
tension in 1/4” turn increments as required. Ideally,
the door should be able to rest on the floor, stop
half way up, and pull down reasonably well, out of
the opening.
With door closed, push the lower portion of vertical
track towards jamb until door fits lightly against door
stop and tighten the 1/4” kep nuts on jamb brackets/
angle mount.
Ensure that the rollers run smoothly through the
joint of the vertical and horizontal tracks. Use your
hammer or vise grips to make small adjustments if
they are not lined up well.
Check that the door is square in the opening and
the tracks are properly aligned.