Chamberlain GS400D Owner's Manual page 17

ATTACH BRACKETS TO GATE OPERATOR
6
Attach post bracket to gate operator using hex head shoulder bolt and lock nut with nylon insert. Attach gate
bracket to operator using release pin and hairpin clip.
Hex Head Shoulder Bolt
Post Bracket
Lock Nut with
Nylon Insert
POSITION GATE BRACKET
7
Hold arm against gate. Make sure gate operator is level. Clamp bracket to gate. Some installations require a
reinforcement be installed on the gate.
"After adjustments have been
made, make sure the piston is
still within marked range."
Piston Range
17
Release Pin
Gate Bracket
Hairpin Clip
Installation