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Safety
Reversing Sensor
FINISHED CEILING
Support bracket
& fastening hardware
may be required.
See page 17.
Slack in Chain Tension
is Normal When
Garage Door is Closed
Safety
Reversing
Sensor
Header
Wall
Access Door
Gap between floor and bottom of
door must not exceed 1/4"
Cable
Pulley Bracket
Header
Bracket
Trolley
Straight
Door
Arm
Emergency
Release
Rope & Handle
Door Bracket
Curved
Door
Arm
Header
Wall
Cable
T-rail
Garage
Door
Closed Position
5
Access
Door
Floor must be level
across width of door
Safety
Reversing Sensor
Header
Bracket
Cable
Pulley Bracket
Door
Bracket
Straight
Door
Arm
Curved
Door Arm
Trolley
Chain
Emergency
Release
Rope & Handle
One-Piece Door with Track
Closed Position
Header
Wall
T-Rail
Garage
Door
The Chamberlain Group, Inc.
One-Piece Door with Track Installation (Cable - Canada)
3/3/93
Cable
Safety
Reversing
Sensor
Slack in Chain
Tension is Normal
When Garage Door is Closed
Before you begin, survey your garage area to see
whether any of the conditions below apply to your
installation.
Based on your particular requirements, there are
several installation steps which might call for materials
and/or hardware not included in the carton.You may
want to review these steps before beginning:
• Step 1, page 13 - Look at the wall or ceiling above
the garage door. The header bracket
must
be
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 supplied) may be required.
• Safety reversing sensor, page 21 - Depending on
garage construction, wood blocks may need to be
securely fastened to mounting locations before
sensors are installed.
• Step 10, page 22 - Alternate 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 additional mounting
hardware for the door bracket.
• Do you have an access door in addition to the
garage door? If not, Model 18752 Outside Trolley
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 without Track
ONE-PIECE Door Installation
You may find it helpful to refer back to this page
as you proceed with the installation of your