Chamberlain CG40DM User Manual download pdf (Page 9)

To avoid SERIOUS damage to garage door opener,

use ONLY those bolts/fasteners mounted in the top of

the opener.

ASSEMBLY STEP 2

Fasten the Rail to the Motor Unit

1. Insert a 1/4"-20x1-3/4" bolt into the cover protection

bolt hole on the back end of the rail as shown. Tighten

securely with a 1/4"-20 lock nut. DO NOT overtighten.

2. Remove the two bolts from the top of the motor unit.

3. Use the carton to support the front end of the rail.

4. Place the “U” bracket, ﬂ at side down onto the motor

unit and align the bracket holes with the bolt holes.

Fasten the “U” bracket with the previously removed

bolts; DO NOT use any power tools. The use of power

tools may permanently damage the garage door

opener.

5. Attach spreader to the motor unit with two screws.

ASSEMBLY STEP 3

Install the Idler Pulley

1. Lay the chain/cable beside the rail, as shown. Grasp

the end of the cable and pass approximately 12"

(30 cm) of cable through the window. Allow it to hang

until Assembly Step 4.

2. Remove the tape from the idler pulley. The inside

center should be pre-greased. If dry, regrease to

ensure proper operation.

3. Place the idler pulley into the window as shown.

4. Insert the idler bolt from the top through the rail

and pulley. Tighten with a 3/8" lock washer and

nut underneath the rail until the lock washer is

compressed.

5. Rotate the pulley to be sure it spins freely.

6. Locate the rail tab. The rail tab is between the idler bolt

and the trolley in the front rail section. Use a ﬂ at head

screwdriver and lift the rail tab until the tab is vertical

(90°).

HARDWARE SHOWN ACTUAL SIZE

Lock Nut

1/4"-20

Bolt 1/4"-20x1-3/4"

Hex Screws

8-32x7/16"

Bolts

Lock Nut

Cover

Protection

Bolt Hole

Chain Spreader

“U”

Bracket

Bolt

1/4"-20x1-3/4"

Lock

Washer

3/8"

Nut 3/8"

Cable Link

Idler

Bolt

Trolley

Idler

Pulley

Grease

Inside Pulley

Screwdriver

Chain

and Cable

Rail

Tab

CORRECT

INCORRECT

Rail Tab

HARDWARE SHOWN ACTUAL SIZE

Lock Washer 3/8"

Nut 3/8"

Idler Bolt

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 39 40

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Chamberlain CG40DM User Manual Page 9

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