LiftMaster SW420 SW420 GL BOARD Manual - Page 9

Installation, Post Mounting

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INSTALLATION POST MOUNTING 1. Locate and anchor two posts made of 3" (7.6 cm) outer diameter heavy walled pipe. Posts should be parallel and square to the gate. IMPORTANT NOTE: The distance between mounting posts and the relative location of the operator to the gate and fence is critical. 2. Locate electrical conduit, as required, prior to pouring concrete. 3. Locate post mount holes on each end of the cabinet. There are (3) sets of holes vertically. The preferred method of post mounting is to use the (2) sets of holes nearest to the rear side of the cabinet. Knock out the post mount holes that have been selected. NOTE: The preferred method of post mounting is to use the (2) sets of holes nearest to the rear side of the cabinet. If mentioned holes are used, the upper rear holes are larger than the other holes. This is because a special nut is required for the U-bolt in these holes due to an inaccessibility of tools inside the cabinet in the area of these holes. 4. Insert the U-bolt nut through the cabinet wall from the inside and onto the leg of the U-bolt. This nut can be tightened with a wrench from outside the cabinet. A special tool is provided for this purpose. Figure 1 Pivot Gate Fence Line 5-3/8" 3" 11" 21-1/4" Pivot Gate 18-1/4" Parallel Mount Fence Line 17-3/8" 16" 18-1/4" 21-1/4" 28" 3" Pipe Perpendicular Mount Figure 2 Use tool provided to insert special nut in rear holes. 3" U-bolt (4 required) Rear of cabinet Special nut Power and control wiring should be run in separate conduit 9

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9
POST MOUNTING
1.
Locate and anchor two posts made of 3" (7.6 cm) outer
diameter heavy walled pipe. Posts should be parallel and
square to the gate.
IMPORTANT NOTE:
The distance between mounting posts and
the relative location of the operator to the gate and fence is
critical.
2.
Locate electrical conduit, as required, prior to pouring
concrete.
3.
Locate post mount holes on each end of the cabinet. There are
(3) sets of holes vertically.
The preferred method of post mounting is to use the (2) sets of
holes nearest to the rear side of the cabinet. Knock out the post
mount holes that have been selected.
NOTE:
The preferred method of post mounting is to use the (2)
sets of holes nearest to the rear side of the cabinet. If mentioned
holes are used, the upper rear holes are larger than the other
holes. This is because a special nut is required for the U-bolt in
these holes due to an inaccessibility of tools inside the cabinet in
the area of these holes.
4.
Insert the U-bolt nut through the cabinet wall from the inside
and onto the leg of the U-bolt. This nut can be tightened with a
wrench from outside the cabinet. A special tool is provided for
this purpose.
Figure 1
Figure 2
INSTALLATION
Perpendicular Mount
Parallel Mount
Fence Line
Fence Line
3" Pipe
21-1/4"
21-1/4"
28"
18-1/4"
18-1/4"
Pivot
Gate
Pivot
Gate
5-3/8"
11"
3"
17-3/8"
16"
Use tool provided to insert
special nut in rear holes.
Power and control wiring should be
run in separate conduit
3" U-bolt
(4 required)
Rear of cabinet
Special nut