Installation step 13, Connect door arm to trolley, Sectional doors only – Chamberlain 2000SDC 1/2HP User Manual
Page 22: Figure 2, Hole alignment alternative
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Installation Step 13
Connect Door Arm to Trolley
Follow instructions which apply to your door type
as illustrated below and on page 23.
SECTIONAL Doors Only
Make sure garage door is fully closed. Pull the emergency 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 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 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.
Figure 2
Hole Alignment Alternative
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.