Craftsman 139.18451DM Manuel D'instructions page 14

Header Wall
Header Bracket
Idler Pulley
Garage
Door
HARDWARE SHOWN ACTUAL SIZE
Clevis Pin 5/16"x1-1/2"
INSTALLATION STEP 3
Attach the Rail to the Header Bracket
1. Position the opener on the garage fl oor 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.
2. Position the rail bracket against the header bracket.
3. Align the bracket holes and join with a clevis pin 5/16"x1-1/2"
as shown.
4. Insert a ring fastener to secure.
Header
Bracket
Mounting
Hole
Temporary
Support
Ring Fastener
14