lift-master 1280c Manual De Usuario
ASSEMBLY STEP 1
Attach the T-Rail To the Opener
To fasten rail, use only those screws mounted
in the top of the opener. Any other screws will
cause serious damage to the opener.
in the top of the opener. Any other screws will
cause serious damage to the opener.
6
• Remove the two washered screws mounted in top
of opener.
• Align T-rail and styrofoam over opener sprocket.
• Cut tape from T-rail, belt and styrofoam.
• REMOVE STYROFOAM.
• Insert both washered screws through the T-rail
into the opener. Tighten both screws securely .
USE ONLY THESE SCREWS! Any other screws
will cause serious damage to the opener.
will cause serious damage to the opener.
Position belt over the opener sprocket.
Washered Screw
5/16"-18x1/2"
Styrofoam
Belt
T-Rail
Hole
The Chamberlain Group, Inc.
Attach Tee Rail To Opener Chassis
Liftmaster Synchro Drive GDO (Belt)
3/13/92 - 6/2/92 - 6/3/92
Attach Tee Rail To Opener Chassis
Liftmaster Synchro Drive GDO (Belt)
3/13/92 - 6/2/92 - 6/3/92
USE ONLY THIS
TYPE AND SIZE
SCREW
T-Rail
Hole
Opener
Sprocket
USE ONLY THIS
TYPE AND SIZE
SCREW
Belt
Washered Screw
5/16"-18x1/2"
T-Rail
Hole
ASSEMBLY STEP 2
Set the Belt Tension
• By hand, thread the spring trolley nut on the
threaded shaft until it is finger tight against the
trolley (Figure A).
trolley (Figure A).
Do not use any tools.
• Insert a screwdriver tip into one of the nut ring
slots and brace it firmly against the trolley
(Figure B).
(Figure B).
• Place a 7/16" open end wrench on the square
end. Rotate about 1/4 turn until the spring releases
and snaps the nut ring against the trolley (Figure C).
and snaps the nut ring against the trolley (Figure C).
This extends the spring for optimum belt tension.
WARNING
CAUTION
WARNING
Assembly Section: Pages 6 - 7
The Chamberlain Group, Inc.
Liftmaster Synchro Drive
Spring Trolley Nut Assembly
3/5/92 - 5/16 /92 - 5/21/92 - 6/2/92
6/11/92
Liftmaster Synchro Drive
Spring Trolley Nut Assembly
3/5/92 - 5/16 /92 - 5/21/92 - 6/2/92
6/11/92
Trolley
Threaded
Shaft
Spring
Trolley Nut
Trolley
The Chamberlain Group, Inc.
Liftmaster Synchro Drive
Spring Trolley Nut Assembly
3/5/92 - 5/16 /92 - 5/21/92 - 6/2/92
6/11/92
Liftmaster Synchro Drive
Spring Trolley Nut Assembly
3/5/92 - 5/16 /92 - 5/21/92 - 6/2/92
6/11/92
Nut
Ring
Trolley
Threaded
Shaft
Nut Ring
Slots
Trolley
Square End
Figure A
Figure B
The Chamberlain Group, Inc.
Spring Trolley Nut
1/25/96
Spring Trolley Nut
1/25/96
Nut Ring
Trolley
Nut Ring
Trolley
1"
1-1/4"
BEFORE
AFTER RELEASE
Figure C