Craftsman 1/2 HP GARAGE DOOR OPENER 139.53978SRT - Manual (Page 5)

Before you begin, survey your garage area to
see whether any of the conditions beiow apply
to your installation.
One-Piece Door without Track
FINISHED C0LING
Support bracket
& fastening
hardware is teguired.
See page 17.
Reversing
between floor and bottom Sensor
Safety of door must not exceed 1/4'.
Reversing Sensor
Based on your particular requirements, there are
severai instaiiation steps which might call for
materials and/or hardware not included in the carton.
• Step 1, page 13 - Look at the wall or ceiling above
the garage door. The header bracket m ustbQ
securely fastened to structural supports.
• Step 5, page 17 - Do you have a finished ceiling in
your garage? If so, a support bracket and
additional fastening hardware (not provided) may
be required.
• Safety reversing sensor, page 21 - Depending on
garage construction, wood blocks or extension
brackets (see Accessories page 38) may be
needed to fasten sensors to mounting locations.
• Step 10, page 22 - Floor mounting of the safety
reversing sensor will require hardware that is not
provided.
• Step 11, page 25 - Generally, a one-piece door
does not require reinforcement. If your door is
lightweight, you can refer to the information
relating to sectional doors on page 24.
• Step 11, page 25 - Depending on your door's
construction, you might need additionai mounting
hardware for the door bracket.
• Do you have an access door in addition to the
garage door? if not. Model 53702 Emergency Key
Release is required. See page 38.
• The gap between the bottom of the garage
door and the floor cannot exceed 1/4".
Otherwise, the safety reverse system may not
work properly. See page
30. The floor or the door
should be repaired.
One-Piece Door with Track
Floor must be level
Safety across width of door
Reversing
Sensor
Reversing
Sensor
Trolley Stop Boh
Closed Position
Cable
You may find it helpful to refer back to this page
as you proceed with the installation of your
opener.