Connect Door Arm To Trolley (Sectional Door) - Chamberlain Series 1200 Owner's Manual

Installation Step 12
Connect Door Arm to Trolley
Follow instructions which apply to your door type
as illustrated below and on page 27.
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 1-3.
Figure 1:
• Fasten straight door arm section to outer trolley Door Arm to Trolley Sectional
New door brkt
with the 5/16"x1" clevis pin. Secure the connection
1/96
with a ring fastener.
• Fasten curved section to the door bracket in the
same way, using the 5/16"x1-1/4" clevis pin.
Outer Trolley
Ring
Fastener
Door
Bracket
Clevis Pin
5/16"x1-1/4"
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.
Hardware Shown Actual Size
Lock Washer 5/16"
Nut 5/16"-18
Clevis Pin
5/16"x1" (Trolley)
Proceed to Adjustment Step 1, page 28. Trolley will re-engage automatically when the opener is operated.
SECTIONAL Doors Only
Inner Trolley
Straight
Door Arm
Curved
Figure 1
Door Arm
Hole Alignment Alternative
Ring Fastener
Clevis Pin
5/16"x1-1/4" (Door Bracket)
5/16"- 18x7/8"
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"
Hex Screw
26
Lock
Washers
5/16"
Nuts
5/16"-18
Door Bracket
Lock
Washers
5/16"
Nuts
5/16"-18
Cut This End
Rope
Manual
Release
Handle
Screws
5/16"-18x7/8"
Figure 2
Screws
5/16"-18x7/8"
Figure 3