Craftsman 139.53901DM1/2 HP Manual Del Propietário página 12

INSTALLATION STEP 1
Determine the Header BracketLocation
To prevent possible SERIOUSINJURYor DEATH:
• Headerbracket MUST be RIGIDLY fastened to structural
support on header wall or ceiling, otherwise garage door
might not reverse when required. DO NOT install header
bracket over drywall.
• Concrete anchors MUST be used if mounting header bracket
or 2x4 into masonry.
• NEVERtry to loosen, move or adjust garage door, springs,
cables, pulleys, brackets, or their hardware, ALL of which
are under EXTREMEtension.
• ALWAYScall a trained door systems technician if garage
door binds, sticks, or is out of balance. An unbalanced
garage door might not reverse when required.
Installation procedures vary according to garage door types.
Follow the instructions which apply to your door.
1. Close the door and mark the inside vertical centerline of the
garage door.
2. Extend the line onto the header wall above the door.
You can fasten the header bracketwithin 4 feet (1.22 m) of
the left or right of the door center only if a torsionspringor
center bearingplate is in the way; or you can attach it to the
ceiling (see page 13) when clearance is minimal. (It may be
mountedon the wall upside downif necessary,to gain
approximately1/2" (1 cm).)
If you need to install the header bracket on a 2x4 (on wall or
ceiling), use lag screws (not provided) to securely fasten the
2x4 to structural supports as shown here and on page 13.
3. Open your door to the highest point of travel as shown. Draw
an intersecting horizontal line on the header wall above the high
point:
• 2" (5 cm) above the high point for sectional door and
one-piece door with track.
• 8" (20 cm) above the high point for one-piece door without
track.
This height will provide travel clearance for the top edge of the
door.
NOTE:If the total number of inches exceedsthe height available
in your garage, use the maximum height possible, or refer to
page 13 for ceiling installation.
Header Wall
Unfinished
Ceiling _ FoRCEILINGOPTIONALBRACKETHEA
Vertical Centerline
of Garage Door
2x4 Structural
Supports
Header Wall
_:---2" (5 cm) Track
_Highest Point
of Travel
--Door
Sectional door with curved track
Header Wa Track
__" (5 cm)
_nt
;_ of Travel
One-piece door with horizontal track
Wall
0
Door_ Hightest
One-piece door without track:
jamb hardware
Door
Header Wall
8" (20 cm)
,_" Highest
Point
of Travel
Pivot
One-piece door without track:
pivot hardware
12