Chamberlain 985 - Manual (Page 22)

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.
Ring
Fastener
Door
Bracket
Clevis Pin
5/16"x1-1/4"
Curved
Door Arm
Straight
Door Arm
Clevis Pin
5/16"x1"
Lock
Washers
5/16"
Nuts
5/16"-18
Door Bracket
Screws
5/16"-18x7/8"
Manual
Release
Handle
Rope
Lock
Washers
5/16"
Nuts
5/16"-18
Screws
5/16"-18x7/8"
Cut This End
Inner Trolley
Outer Trolley
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