This kit should be installed prior to installation of your
garage door opener. Attach the extension rail after
fastening the existing rail to the power unit. See Assembly
Section of your owner’s manual, then continue with step 3
below.
In an existing installation, the trolley must be in down
(closed) position during assembly and installation. The
rail/opener assembly must be taken down and the limits
must be readjusted after re-installation.
PROCEDURE
1. Place rail/opener assembly on a flat surface.
2. Remove the rail brackets at the end of the existing rail
and set aside (Figure 1).
3. Connect the extension rail to the end of rail (Figure 2):
• Secure rails together with braces and bolts.
• Tighten all hex bolts.
4. Reattach the rail brackets to the end of the extension
rail.
5. Replace the emergency release rope that came with the
opener with the new, longer replacement rope.
6. Install the opener following the instructions in your
owner’s manual, but stop before connecting the door
arm to the outer trolley.
7. Reposition the inner trolley as follows:
• Pull the emergency release handle to disconnect the
outer trolley from the inner trolley.
• Connect power to the opener (be sure the safety
reverse sensor is connected).
• Refer to the Adjustment Section in your opener’s
manual, and adjust the travel limits until the inner
trolley is about 3/4" (19 mm) from the rail joint
(Figure 3).
8. With the inner trolley at this new location, complete the
final Installation step in your owner’s manual to connect
the door arm and re-engage the trolley.
9. Complete all remaining adjustments of your opener,
according to your owner’s manual.
Header
W
all
Extension Rail
Rail S
u
pport Brace
Disconnected
O
u
ter Trolley
NOTIC
E
Inner Trolley position
b
efore adj
u
stment
3/4"
(19 mm)
Inner Trolley position
after adj
u
stment
Hex Bolt
1/4-20 x 7/16"
Hex Bolt
1/4-20x7/16"
Rail Brackets
Rail
Figure 1.
Remove rail brackets.
Figure 3.
Reposition the inner trolley.
Figure 2.
Connect both rails.
®
OWNER’S INSTRUCTIONS
To prevent possible SERIOUS INJURY or DEATH:
• Be sure door is CLOSED and
• Disconnect power to opener before proceeding.
WARNING
CAUTION
WARNING
WARNING
Extension Rail
Rail Support Brace
Model 7806CB
EIGHT-FOOT SCREW DRIVE
RAIL EXTENSION KIT
© 2007, The Chamberlain Group, Inc.
114A3369
All Rights Reserved
