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Ten-Foot Rail Extension Kit
Model 8810CB and 8810CB-P
BEFORE YOU BEGIN:
• The trolley must be in down (closed door) position during assembly and
installation. If you have a completely installed garage door opener, the rail/
opener assembly must be taken down. UP and DOWN Limits must be
readjusted after installation.
• Opener hanging brackets will require repositioning and the addition of an
extra bracket for stability due to increased rail length.
IF THIS IS A NEW INSTALLATION:
Use the front (header), belt assembly, and longer emergency release rope in
this kit in place of those packaged with your garage door opener. Add the
enclosed center rail as the second rail (remove one of the center rails
packaged with the garage door opener) section, creating a five piece rail
assembly. Complete the assembly, installation, and adjustment of your
opener according to your owner’s manual, with the exception of adding an
additional hanging bracket for stability.
IF THIS IS AN EXISTING INSTALLATION, CONTINUE AS FOLLOWS:
1. Pull down on the emergency release handle, then disconnect the trolley
from the door arm.
2. Disconnect the rail/opener assembly from the header bracket and
hanging brackets, and place it on the floor.
3. Remove the belt cap retainer from the opener sprocket and set aside.
4. Disconnect the master link from the trolley threaded shaft and belt;
discard (Figure 1).
5. Remove the spring/nut from the trolley and discard.
6. Remove idler pulley assembly and set aside.
7. Remove the belt assembly and discard.
8. Push the trolley back toward the opener. Disconnect the front rail and
second rail sections by using a screwdriver tip to pry up the outer tab on
each side of the rail, then slide it off the existing rail assembly. Discard
the front and second rails (Figure 2).
9. Align the new front and center rails with the existing rail assembly,
keeping the cut out “window” at the front (header) end. Be sure to keep
rails right side up: the idler pulley bolt hole above the window is larger
on top of the rail than on the bottom. Slide the new center rail onto the
assembly, then add the front rail. Tabs along the side will lock into place.
10. As a temporary stop, insert a screwdriver into the hole 10" (25 cm)
from the front end of the rail (Figure 1). Slide the trolley assembly to
this point.
11. Lay the new belt beside the rail. Grasp the end with the hooked trolley
connector and pass approximately 12" (30 cm) of belt through the
window. Keeping the ribbed side toward the rail, and allow it to hang
while you complete the next two steps.
12. Replace the idler pulley, lock washer and nut. Rotate it to be sure it
spins freely. Grease the center if necessary.
13. Locate the rail tab. Use a flathead screwdriver and lift the rail tab until
the tab is vertical (90°) (Figure 2).
14. Pull the belt around the idler pulley and hook the trolley connector into
the retaining slot on the trolley (Figure 1). The ribbed side must contact
the pulley.
15. With the trolley against the screwdriver, dispense the remainder of the
belt along the rail length toward the motor unit and around the sprocket
(Figure 1). The sprocket teeth must engage the belt.
16. Check to make sure the belt is not twisted, then connect it to the flat end
of the trolley threaded shaft with the master link (Figure 1):
• Push pins of master link bar through holes in end of belt and trolley
threaded shaft.
• Push master link cap over pins and past pin notches.
• Slide clip-on spring over cap and onto pin notches until both pins are
securely locked in place.
To prevent possible SERIOUS INJURY or DEATH:
• Disconnect ALL electric and battery power BEFORE performing ANY
service or maintenance.
Figure 1
Figure 2
The garage door MUST be in the fully closed position during
installation.
To remove rail pry both
end tabs of front
rail slightly outward
Idler Bolt hole
(KEEP LARGER
ONE ON TOP)
NEW
FRONT RAIL
CORRECT
INCORRECT
Rail Tab
Rail Tab
Threaded
Shaft
Front Rail
Section
Master
Link
Master
Link
Idler Pulley
Trolley
Connector
Retaining
Slot
Retaining
Slot
Trolley
Connector
WARNING: This product can expose you to chemicals including
lead, which are known to the State of California to cause
cancer or birth defects or other reproductive harm. For more
information go to www.P65Warnings.ca.gov
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