Chamberlain WHISPER DRIVE WD822KD Owner's Manual page 25

INSTALLATION STEP 12
Connect Door Arm to Trolley
Follow instructions which apply to your door type as
illustrated below and on the following page.
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 pulley) about 8" (20 cm) 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.
IMPORTANT: The groove on the straight door arm MUST
face away from the curved door arm (Figure 4).
• 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 3, Hole alignment alternative:
– If holes in curved arm are above holes in straight
arm, disconnect straight arm. Cut about 6" (15 cm)
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
bolts, lock washers and nuts.
• Pull the emergency release handle toward the opener at
a 45° angle so that the trolley release arm is horizontal.
Proceed to Adjustment Step 1, page 27. Trolley will
re-engage automatically when opener is operated.
HARDWARE SHOWN ACTUAL SIZE
Nut 5/16"-18
Ring Fastener
Clevis Pin
5/16"x1-1/4" (Door Bracket)
Clevis Pin
5/16"x1" (Trolley)
Lock Washer 5/16"
Hex Bolt
5/16"-18x7/8"
25
Figure 1
Pulley
8" (20 cm) min.
Trolley
Stop Bolt
Ring
Fastener
Door
Bracket
Clevis Pin 5/16"x1-1/4"
Figure 2
Pulley
8" (20 cm) min.
Trolley
Stop Bolt
Lock
Washers
5/16"
Nuts
5/16"-18
Door Bracket
Figure 3
Pulley
8" (20 cm) min.
Trolley
Stop Bolt
Lock
Washers
5/16"
Nuts
5/16"-18
Figure 4
CORRECT
Straight
Door
Curved
Arm
Door
Arm
(Groove
facing out)
Outer
Inner
Trolley
Trolley
Straight
Door Arm
Curved Door Arm
Bolts
5/16"-18x7/8"
Bolts
5/16"-18x7/8"
Cut this end
INCORRECT
Straight
Door
Arm
Clevis Pin
5/16"x1"
Emergency
Release
Handle
Curved
Door
Arm