Craftsman 139.53985DM 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
Gap between floor
Safety Reversing Sensor
and bottom of door must 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.
Wall-mounted Door
Control
Access
Door
Safety Reversing
Sensor
Access
Door
Safety
Reversing
Gap between floor
Sensor
and 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
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
the gap.
Motor Unit
Rail Tab
Header
Bracket
Door Bracket
Straight
Door Arm
Header
Wall
Garage Door
Rail Tab
Header
Wall
Header
Bracket
Door
Bracket
Garage Door
5
CLOSED POSITION
Trolley
Cable
Rail
Emergency
Release
Curved Rope & Handle
Door
Arm
CLOSED POSITION
Cable
Curved
Rail
Door Arm
Emergency
Straight
Release
Door Arm
Rope & Handle
Chain