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Assembly

STEP 2 Fasten the rail to the motor unit

To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the

top of the opener.

1. Insert a 1/4"-20 x 1-3/4" boltinto the cover protection bolt hole on the back end of the rail as

shown. Tighten securely with a 1/4"-20 locknut.DO NOT overtighten.

2. Remove the boltsfrom the top of the motor unit.

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

4. Place the “U” bracket, flat side down onto the motor unit and align the bracket holes with the

bolt holes.

5. Fasten the “U” bracket with the previouslyremoved bolts;DO NOT use any power tools.The

use of power tools may permanentlydamage the garage door opener.

6. Attach chain spreader to the motor unit with two screws.

“U” Bracket

Hex Screws

8-32x7/16

Cover

Protection

Bolt Hole

Bolt

Lock Nut

Bolts (Mounted in the

garage door opener)

Chain

Spreader

Bolt

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

Lock Nut

1/4"-20

HARDWARE

Chamberlain C455 User Manual

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