Craftsman 139.53920DM Owner's Manual 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
Safety Reversing
Sensor
ONE-PIECE DOOR WITH TRACK
Gap between fl oor and
bottom of door must not
Safety
exceed 1/4" (6 mm).
Reversing
Sensor
FINISHED CEILING
Support bracket &
fastening hardware
is required.
See page 16.
Rail
Access
Door
Safety Reversing
Gap between fl oor and
Sensor
bottom of door must
not exceed 1/4" (6 mm).
Access
Door
Safety
Reversing Sensor
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.
Slack in chain tension
is normal when garage
door is closed.
Wall-mounted
Door Control
Header
Bracket
Door Bracket
Header
Wall
Trolley
Stop Bolt
Cable
Header
Wall
Header
Curved
Bracket Door Arm
Door
Bracket
Garage Door
5
Motor Unit
CLOSED POSITION
Trolley Stop Bolt
Cable
Trolley
Rail
Curved
Door
Straight
Arm
Door Arm
Garage Door
CLOSED POSITION
Chain
Rail
Emergency Release
Straight
Rope & Handle
Door
Arm
Emergency
Release
Rope & Handle