Chamberlain 1280 - 1/2 HP - Manual (Page 13)

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" - 18x1-7/8" lag screws.
• Fasten the opener to the hanging brackets with
5/16" - 18x7/8" 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.
Measure
Distance
Lag Screws
5/16"-18x1-7/8
Bracket
(Not Supplied)
Lag Screws
5/16"-18x1-7/8"
(Not Supplied)
5/16"-18x7/8" Screw
5/16" Lock Washer
5/16"-18 Nut
— FINISHED CEILING —
The Chamberlain Group, Inc.
Hang Opener Chassis
Liftmaster Synchro Drive (Belt)
3/13/92
5/16"-18x7/8"
Hex Screws
5/16" Lock Washers
5/16"-18 Nuts
Hidden
Support
5/16"-18x7/8" Screw
5/16" Lock Washer
5/16"-18 Nut
Structural
Supports
13
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
Figure 2
Hex Screw
5/16"- 18 x 7/8" Nut 5/16" - 18 Lockwasher 5/16"
Lag Screw
5/16"-18x1-7/8"
Hardware Shown Actual Size
WARNING
CAUTION
WARNING
RAIL GREASE
NO. 83A4
The Chamberlain Group, Inc.
Liftmaster Combination
5/23/92