Chamberlain C2405C Istallation Manual page 8

Assembly
STEP 2 Fasten the Rail to the Motor Unit
MODEL C2405
To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted
in the top of the opener.
1. Insert a1/4"-20 x 1-3/4" bolt into the cover protection bolt hole on the backend of the rail
as shown.
Tighten securely with a1/4"-20 lock nut. DO NOT over tighten.
2. Remove the 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, flat side down onto the motor unit and align the bracket holes with
the bolt holes.
5. 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.
6. Attach chain spreader to the motor unit with two screws.
Bolts (Mounted in the
garage door opener)
"U" Bracket
Bolt
Cover Protection
Bolt Hole
Lock Nut
8
HARDWARE
Bolt 1/4"-20x1-
3/4"
Hex Screws
8-32x7/16
Chain
Spreader
Lock Nut
1/4"-20