Chamberlain LiftMaster LA412 Owner's Manual page 17

9
SECURE POST BRACKET TO GATE POST
Mark holes for the post bracket. Remove the clamp and the operator, and set both aside.
Next, drill adequate holes in the gate post.
Secure the post bracket to the gate post using hardware. The gate operator (arm) must be level.
Flat Washers
Hex Nuts
Lock Washers
10
SECURE GATE BRACKET TO GATE
Drill holes in gate (or reinforcement, if necessary) that are large enough for the gate
bracket mounting hardware. Make sure the gate operator (arm) is level, and then secure
the gate operator to the gate using hardware (not provided).
Arm
Manually move the gate to verify that it opens and closes fully.
Hex Nut
Lock Washer
Flat Washer
Gate Bracket
Hex Bolt
Carriage Bolts
NOTE: Some installations may
require additional reinforcement be
installed on the gate.
Reinforcement
Area
17
Welder (Optional)
Welder
(optional)
Angle Iron
Wood
OR
OR
Flat Bar
Installation