Chamberlain 1280 - 1/2 HP Manuale Utente

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.

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

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

Hex Screw

5/16"- 18 x 7/8"

Nut  5/16" - 18

Lockwasher  5/16"

Lag Screw

5/16"-18x1-7/8"

RAIL GREASE

NO. 83A4

The Chamberlain Group, Inc.

Liftmaster Combination
5/23/92