Chamberlain WHISPER DRIVE 248754 - Manual (Page 14)

14
INSTALLATION STEP 3
Attach the Rail to the Header Bracket
• 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 will
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.
HARDWARE SHOWN ACTUAL SIZE
Clevis Pin 5/16"x1-1/2" Ring Fastener
Header Bracket
Clevis Pin
Opener Carton or
Temporary Support
Mounting
Hole
Ring
Fastener
Idler Pulley
Header
Bracket
Garage
Door
Header Wall