Craftsman 139.54985 Owner's Manual page 5

Planning (Continued)
ONE-PIECE DOOR INSTALLATIONS
Generally, a one-piece door does not require reinforcement. If
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your door is lightweight, refer to the information relating to
sectional doors in Installation Step 8.
Depending on your door's construction, you may need
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additional mounting hardware for the door bracket (Step 8).
ONE-PIECE DOOR WITHOUT TRACK
Header Wall
Gap between floor
and bottom of door must
Safety Reversing Sensor
not exceed 1/4" (6 mm)
ONE-PIECE DOOR WITH TRACK
Safety
Reversing Sensor
FINISHED CEILING
Support bracket
& fastening
hardware is required. See
page 16.
Rail
Slack in chain tension is
normal when garage door
is closed.
Access
Door
Safety Reversing
Sensor
Access
Door
Safety
Reversing
Gap between floor and
Sensor
bottom of door must not
exceed 1/4" (6 mm)
Without a properly working safety reversal system, persons
(particularly small children) could be SERIOUSLY INJURED or
KILLED by a closing garage door.
The gap between the bottom of the garage door and the
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floor MUST NOT exceed 1/4" (6 mm). Otherwise, the safety
reversal system may NOT work properly.
The floor or the garage door MUST be repaired to eliminate
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the gap.
Motor Unit
Wall-mounted Door
Control
Rail Tab
Header
Bracket
Door Bracket
Header
Wall
CLOSED POSITION
Rail Tab
Header
Header
Wall
Bracket
Door
Bracket
Garage Door
5
CLOSED POSITION
Trolley
Cable
Rail
Emergency
Release
Straight
Curved Rope & Handle
Door
Door
Arm
Arm
Garage Door
Trolley
Chain
Cable
Curved
Rail
Door Arm
Emergency
Release
Straight
Rope & Handle
Door
Arm