Chamberlain LiftMaster LA412 Owner's Manual page 16

8
TEST GATE TRAVEL
Manually open and close the gate.
Ensure that the operator does not bind against the pull-to-open bracket.
Ensure that the piston does not bottom out.
NOTE: If gate does not open and close completely adjust the position of the gate bracket and mark new mounting holes.
Installation
Do not allow piston to fully extend
or fully retract.
1/2" (1.3 cm)
16
1/2" (1.3 cm)