Chamberlain Whisper Drive Security+ 248739 Owner's Manual page 26

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INSTALLATION STEP 12
ConnectDoorArm to the Trolley
FoItow 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. Pult the emergency
release handle to disconnect the outer trolley from the
inner trolley. Slide the outer trolley back (away from the
pulEey)about 8" (20 cm) (Figures 1,2 and 3).
Figure I:
. Fastenstraight door arm section to outer trofleywith
the 5/16"xi" clevis pin. Secure the connection with a
ring fastener.
• Fastencurved section to the door bracket in the same Pulley
way, using the 5/16"xl-1/4" clevis pin,
IMPORTANT: Thegroove on the straight door arm MUST
face away from the curved door arm (Figure 4).
Figure 2:
• Bring arm sections together. Ffnd two pairs of holes
that fine 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"(t5 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. Putiey
Pull the emergency release handle toward the opener at
a 45°angie so that the trotiey release arm is horizontal.
Proceed to Adjustment Step 1, page 28. Trolley will
re-engage automatically when opener is operated.
HARDWARESHOWN ACTUALSIZE
@0
Nut 5/t6"-I8 RingFastener
ClevisPin
5/16"xIol/4" (Door8racket) LockWasher5/t6"
CIevis Pin HexBolt
5/!6"x1"(Trolley) 5/16_-18x7t8"
om)min.
Trolley /
StopBoit Lock
Washers
5116"
Nuts I
5/16"-18
_ J
' Door Bracket
Figure2
Figure
Figure4
Boils
5/16"- 1 8x7/8"
;(..B" ( 2o or.) mi.._i
sto Bott Louk // (
Washers_/ 1
NutS 5/}6" Lo7 I
oo, ?
Cutthis _nd
CORRECT INCORRECT
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