How to Guide

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Ten-Foot Rail Extension Kit

Model CMXZDCG4910

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. The UP and DOWN travel 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.

• This may require two people for installation.

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 the opener according to the garage door opener manual. Ensure that an

additional hanging bracket is added for stability, as detailed below.

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 sprocket cover 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.

Figure 1

Figure 2

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

Master

Link

Trolley

Connector

Retaining

Slot

Threaded

Shaft

Front Rail

Section

Master

Link

Idler Pulley

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.

REFER TO GARAGE DOOR OPENER MANUAL FOR DETAILED INSTALLATION,

ADJUSTMENTS, AND SAFETY INFORMATION.

To prevent possible SERIOUS INJURY or DEATH:

• Disconnect ALL electric and battery power BEFORE performing ANY service

or maintenance.

The garage door MUST be in the fully closed position during installation.

Summary of content (4 pages)

PAGE 1
Ten-Foot Rail Extension Kit Model CMXZDCG4910 ® 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. The UP and DOWN travel 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. • This may require two people for installation.
PAGE 2
17. Insert the trolley threaded shaft through the hole in the trolley. Be sure the belt is not twisted, and the ribbed side faces the rail. 18. Hold the belt at the trolley shaft as you thread the spring nut by hand (Figure 3) onto the shaft until finger tight against the trolley. Do not use any tools. 19. Remove the screwdriver. 20. Insert a flathead screwdriver tip into one of the nut ring slots and brace it firmly against the trolley. 21.
PAGE 3
Juego de extensión de riel de 3.05 m (10 pies) Modelo CMXZDCG4910 ® ANTES DE COMENZAR: • El carro portador debe estar en la posición hacia abajo (puerta cerrada) durante el proceso de armar e instalar la extensión del riel. Si ya tiene un sistema de apertura completamente instalado en la puerta del garaje, deberá desarmar el conjunto de riel y abridor. El desplazamiento HACIA ARRIBA y HACIA ABAJO debe volver a ajustarse después de la instalación. .
PAGE 4
17. Introduzca la flecha roscada a través del orificio en el carro. Asegúrese de que la correa no esté torcida y que el nervio esté orientado hacia el riel. 18. Sujete la correa contra la flecha del carro mientras enrosca la tuerca de resorte con la otra mano (Figura 3) en la flecha, y apriete la tuerca con los dedos; no utilice ninguna herramienta. 19. Quite el destornillador. 20. Introduzca la punta de un destornillador plano en una de las ranuras del aro de la tuerca yfijelo firmemente contra el carro.