Chamberlain RESIDENTIAL GATE OPERATOR GA420D - Manual (Page 15)

15 Installation
Position the Extension Bracket to Post Bracket
Hold post bracket in desired position. Align extension bracket to a position as CLOSE AS POSSIBLE
above the marker.
Assemble post bracket by placing the extension bracket on top of post bracket. Insert bolt through brackets
and fasten with flange nut. DO NOT TIGHTEN AT THIS TIME.
3
Left-Hand Gate Right-Hand Gate
3/8 Ribbed Neck Bolt
Extension Bracket Extension Bracket
Post Bracket Post Bracket
Flange Nut Flange Nut
3/8 Ribbed Neck Bolt