Chamberlain 7806CB User manual

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 Wall

Extension Rail

Rail Support Brace

Disconnected

Outer Trolley

NOTICE

Inner Trolley position

before adjustment

3/4"

(19 mm)

Inner Trolley position

after adjustment

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

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