Attach The Rail To The Header Bracket; Clevis Pin 5/16"X2-3/4; Clevis Pin 5/16"X1-1/4; Clevis Pin 5/16"X1 - Chamberlain 3280-390 1/2 HP User Manual

Header Wall
Header
Bracket
Belt Pulley
Bracket
Garage
Door
HARDWARE SHOWN ACTUAL SIZE
Clevis Pin
5/16"x2-3/4"
10
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.
Header
Bracket
Clevis Pin
5/16"x2-3/4"
Ring Fastener
Ring
Fastener
Belt Pulley
Bracket
Rail
Temporary
Support