Chamberlain C450 C450 Owner s Manual - English - Page 7
STEP 2 Fasten the rail to the motor unit, HARDWARE
View all Chamberlain C450 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 7 highlights
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" 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 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. HARDWARE Bolt 1/4"-20x1-3/4" Lock Nut 1/4"-20 Bolts (Mounted in the garage door opener) "U" Bracket Bolt Cover Protection Bolt Hole Hex Screws 8-32x7/16 Chain Spreader Lock Nut 7