Chamberlain 2000SDC-R - Manual (Page 11)

• Position the opener on the garage floor below the
header bracket. Use packing material as a protective
base.
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.
11
Installation Step 3
Attach the Rail to the Header Bracket
Hardware Shown Actual Size