Chamberlain Whisper Drive Security+ HD800D Owner's Manual page 26

ALL ONE-PIECE DOORS
1. Assemble the Door Arm:
• Fasten the straight and curved door arm sections
together to the longest possible length (with a 2 or 3
hole overlap).
• Make sure the garage door is fully closed. Connect the
straight door arm section to the door bracket with the
5/16"x1-1/4" clevis pin.
• Secure with a ring fastener.
• Pull the emergency release handle, disconnecting the
outer trolley from the inner trolley by pulling straight
down on the emergency release handle and sliding the
outer trolley back toward the motor unit.
• Connect the curved door arm section to the trolley
using the 5/16"x1-1/4" clevis pin and ring fastener.
NOTE: Adjusting the limits on the following page:
• The trolley will automatically connect. If not, review the
trolley lockout feature on page 31.
• When setting the up limit on the following page, the
door should not have a "backward" slant when fully
open as illustrated below. A slight backward slant will
cause unnecessary bucking and/or jerking operation
as the door is being opened or closed from the fully
open position.
Door Arm
Closed
Door
Inner Trolley
Outer Trolley
Inner Trolley
Open Door
Door
Bracket
Clevis Pin
5/16"x1-1/4"
Emergency Release Handle
Correct Angle
26
Ring
Fastener
Lock
Washers
5/16"
Straight
Arm
Bolts
5/16"-18x7/8"
Outer Trolley
Door with
Backward Slant
(Incorrect)
Nuts
5/16"-18
Curved
Door Arm