Chamberlain 3850 - Installation Step 3: Attach Rail to Header Bracket

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