Chamberlain LiftMaster PROFESSIONAL SECURITY+ 3255-2CM Manuel Du Propriétaire page 10

Header Wall
Header Bracket
Chain Pulley
Bracket
Garage
Door
HARDWARE SHOWN ACTUAL SIZE
Clevis Pin
5/16"x2-3/4"
INSTALLATION STEP 3
Attach the Rail to the Header Bracket
• Position the opener on the garage floor below the
header bracket. Use packing material as a protective
base. NOTE: If the door spring is in the way you'll need
help. Have someone hold the opener securely on a
temporary support to allow the rail to clear the spring.
• Position the rail bracket against the header bracket.
• Align the bracket holes and join with a clevis pin
as shown.
• Insert a ring fastener to secure.
Rail
Header Bracket
Clevis Pin
5/16"x2-3/4"
10
Ring Fastener
Chain
Pulley
Bracket
Rail
Temporary
Support
Ring Fastener