Craftsman 139.18451DM Manuel D'instructions page 5

Planning (Continued)
ONE-PIECE DOOR INSTALLATIONS
• Generally, a one-piece door does not require reinforcement.
If your door is lightweight, refer to the information relating to
sectional doors in Installation Step 11.
• Depending on your door's construction, you may need
additional mounting hardware for the door bracket (Step 11).
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
Gap between floor and
bottom of door must not
Safety
exceed 1/4" (6mm)
Reversing Sensor
Rail
Slack in chain tension
is normal when garage
door is closed.
Wall-mounted
Door Control
Access
Door
Safety Reversing
Sensor
Access
Header
Door
Wall
Safety
Reversing
Sensor
5
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
fl oor MUST NOT exceed 1/4" (6 mm). Otherwise, the safety
reversal system may NOT work properly.
• The fl oor or the garage door MUST be repaired to eliminate
the gap.
Motor Unit
CLOSED POSITION
Rail Tab
Cable
Header
Bracket
Rail
Door Bracket
Straight
Door
Arm
Header
Wall
Garage Door
CLOSED POSITION
Rail Tab
Cable
Header
Curved
Bracket Door Arm
Door
Straight Door
Bracket
Arm
Garage
Door
Trolley
Emergency
Release
Rope & Handle
Curved
Door
Arm
Chain
Rail
Emergency
Release
Rope &
Handle