Chamberlain 9902 - Manual (Page 26)

Installation Step 13
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, 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.
Ring
Fastener
Door
Bracket
Straight
Door Arm
Curved
Door Arm
Inner
Trolley
Outer
Trolley
Lock
Washers
5/16" Nuts
5/16"-18
Door
Bracket
Screws
5/16"-18x7/8"
Cut this end
Manual
Release
Handle
Rope
Lock
Washers
5/16"
Nuts
5/16"-18
Screws
5/16"-18x7/8"
Clevis Pin
5/16"x1"
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.
Proceed to Adjustment Step 1, page 28.
Trolley will re-engage automatically when the
opener is operated.
26
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.
Figure 1
Figure 2
Figure 3
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
Hole Alignment Alternative