Hang The Opener - Chamberlain 1255GM Owner's Manual

Installation Step 5

Hang the Opener

Two representative installations are shown.
Yours may be different. Hanging brackets should
be angled, Figure 1, to provide rigid support. On
finished ceilings, Figure 2, attach a sturdy metal
bracket to structural supports before installing the
opener. The bracket and fastening hardware are not
supplied.
• Measure the distance from each side of the opener
to the structural support.
• Cut both pieces of the hanging bracket to required
lengths.
• Drill 3/16" pilot holes in the structural supports.
• Attach one end of each bracket to a support with
5/16"x1-7/8" lag screws.
• Fasten the opener to the hanging brackets with
5/16"-18x7/8" hex screws, lock washers and nuts.
• Check to make sure the T-rail is centered over the
door (or in line with the header bracket if the
bracket is not centered above the door).
• Remove the 2x4. Operate the door manually. If
the door hits the rail, raise the header bracket.
Grease the top and underside of
the rail surface where the
trolley slides. A tube of
grease is supplied.
Hardware Shown Actual Size
Lag Screw
5/16"-18x1-7/8"
Hex Screw
5/16"- 18x7/8" Lock Washer 5/16"
Nut 5/16"-18
The opener could fall and injure someone if it is
not properly secured. Fasten the opener
securely to structural supports of the garage.
Figure 1
Measure
Distance
5/16"-18x7/8" Screw
5/16" Lock Washer
5/16"-18 Nut
Figure 2
Bracket
(Not Supplied)
5/16"-18x7/8" Screw
5/16" Lock Washer
5/16"-18 Nut
13
WARNING
Hidden
Support
— FINISHED CEILING —
Lag Screws
5/16"x1-7/8"
5/16"-18x7/8" Screw
5/16" Lock Washer
Structural
Supports
Lag Screws
5/16"x1-7/8"
(Not Supplied)
5/16"-18 Nut