Craftsman 139.53920DM Owner's Manual page 4

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Identify the type and height of your garage door. Survey your
garage area to see if any of the conditions below apply to your
installation. Additional materials may be required. You may find it
helpful to refer back to this page and the accompanying
illustrations as you proceed with the installation of your opener.
Dependingon your requirements, there are several installation
steps which may call for materials or hardware not included in the
carton.
• Installation Step 1 - Look at the wall or ceiling abovethe garage
door. The header bracket must be securely fastenedto
structural supports.
• Installation Step 5 - Do you have a finished ceiling in your
garage? If so, a support bracket and additional fastening
hardware may be required.
• Installation Step 10- Dependingupon garage construction,
extension brackets or wood blocks may be neededto install
sensors.
• Installation Step 10 - Alternate floor mounting of the safety
reversing sensor will require hardware not provided.
Do you havean access door in addition to the garage door?
If not, Model 53702 Emergency Key Releaseis required. See
Accessories page.
Look at the garage door where it meets the floor. Any gap
between the floor and the bottom of the door must not exceed
1/4" (6 mm). Otherwise, the safety reversal system may not
work properly. See Adjustment Step 3. Floor or door should be
repaired.
SECTIONAL DOORINSTALLATIONS
• Do you havea steel, aluminum, fiberglass or glass panel door?
If so, horizontal and vertical reinforcement is required
(Installation Step 11).
• The opener should be installed abovethe center of the door.
If there is a torsion spring or center bearing plate in the way of
the header bracket, it may be installed within 4 feet (1.22 m) to
the left or right of the door center. See Installation Steps 1
and 11.
• If your door is more than 7 feet (2.13 m) high, see rail extension
kits listed on Accessories page.
SECTIONAL DOORINSTALLATION
Horizontal and vertical reinforcement is
needed for lightweight garage doors
(fiberglass, steel, aluminum, door with
glass panels, etc.). See page 23 for details.
HeaderWall
Slack in chain tension
is normal when garage
door is closed.
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 16.
Extension Spring
OR
Torsion Spring
Motor Unit
Centerline
of Garage_
Door _z_
Wall-mounted
Door Control
Safety Reversing Sensor
Gap between floor and
bottom of door must not
exceed 1/4" (6 mm).
Safety
Reversing Sensor
Access
Door
O
i
CLOSEDPOSITION
Header
Bracket Trolle
Garage
Door- /_/ E_ unam
I
ht _
_J Arm | j Emergency
,_o°j / _ .... _ ReleaSe..
__ Rope&Handle
\_1 P_ \ Curved
HI \ ' Door
__1 I_oor Arm
ij Bracket