Chamberlain 1280-298LMC Garage Door Opener User Manual


 
Installation Step 12
Connect Door Arm to Trolley
Follow instructions which apply to your door type
as illustrated below and on page 23.
Make sure garage door is fully closed. Pull the manual release handle to disconnect the outer trolley
from the inner trolley. Slide the outer trolley back (away from the door) about 2" as shown in
Figures 1, 2 and 3.
Figure 2:
Bring arm sections together. Find two pairs of holes
that line up and join sections. Select holes as far
apart as possible to increase door arm rigidity.
Clevis Pin
5/16"x1-1/4"
Clevis Pin
5/16"x1"
Ring Fastener
Door
Bracket
Door
Bracket
Curved
Door Arm
Straight
Door Arm
Inner Trolley
Outer Trolley
Lock
Washers
5/16"
Nuts
5/16"-18
Screws
5/16"-18x7/8"
Manual
Release
Handle
Rope
Cut This End
Lock
Washers
5/16"
Nuts
5/16"-18
Screws
5/16"-18x7/8"
Figure 3:
If holes in curved arm are
above
holes in straight
arm, disconnect straight arm. Cut about 6" from
the solid end. Reconnect to trolley with
cut end
down
as shown.
• Bring arm sections together.
• Find two pairs of holes that line up and join with
screws, lock washers and nuts.
Proceed to Adjustment Step 1, page 24. Trolley will re-engage automatically when the opener is operated.
22
Figure 1:
Fasten straight door arm section to outer trolley
with the 5/16"x1" clevis pin. Secure the connection
with a ring fastener.
• Fasten curved section to the door bracket in the
same way, using the 5/16"x1-1/4" clevis pin.
SECTIONAL Doors Only
Lock Washer 5/16"
Nut 5/16"-18
Ring Fastener
Hex Screw
5/16"-18x7/8"
Clevis Pin
5/16"x1" (Trolley)
Clevis Pin
5/16"x1-1/4" (Door Bracket)
Hardware Shown Actual Size
Figure 1 Figure 2
Figure 3
Hole Alignment Alternative