Chamberlain LIFTMASTER SL920 - Manual (Page 9)

9
Installation continued...
 Disconnect Power from the gate
operator!
 The tail end of the gate should
extend approximately 24" beyond the edge of
the driveway. If this is not the case, an
extension tail will need to be added to the
gate. This will give room for the gate operator.
Make the extension tail 24" X 24" as shown.
If the gate has not yet been fabricated, add
24" to the length of the gate.
 If no concrete surface exists to
attach the gate operator to, make a cement
pad 16" X 24" X 10". The cement pad should
be at least 6" in depth and extend below frost
line. If it is desirable to elevate the gate
operator it may protrude 4" or more above
ground as shown. Place the shortest pad
edge even with the driveway edge. Place the
longer edge of the pad 1" away from the gate.
 If the steel mounting stand will be
used, place the shortest edge of the stand 4"
from the driveway edge and place the longest
edge of the stand 4-1/2" away from the gate.
The top of the steel stand may sit on the
ground or the stand may be elevated to keep
the operator above snow, flooding etc. Make
a post hole and cement the stand in place,
making sure the stand is level and square to
the gate.
CEMENT PAD LOCATION
3
4
5
GATE PREPERATION
OPTIONAL MOUNTING STAND