12
Place the chain over the top of the idler sprockets and
under the drive sprocket (see Figure 7).
Rack and Pinion Operator
First, attach the nuts to the leveling bolts. Then slip the
leveling bolt nuts into the hexagonal holes in the four
corners on the bottom of the operator.
As shown in Figure 4, place the operator on the
foundation plate with the pinion facing the gate with
approximately 1 3/8 in. (3.5 cm) between the inside
edge of the gate frame (where you mount the rack
spacers) and the center of the drive pinion.
Next you need to set the height for the rack by adjusting
the leveling bolts. Raise the operator with the leveling
bolts at least enough so that you will later be able to
lower the operator 1/16 in. (1.5 mm) (this is the
clearance you need for the rack to move over the
pinion). Now you can secure the operator to the
foundation plate with the mounting bolts.
Prepare the rack sections by installing the spacers,
washers and bolts on the rack sections as shown in
Figure 8. The bolts should be centered in the slots of the
rack sections.
Rack and pinion: 1 3/8 in.
Chain: 15/16 in.
9 1/4 in.
(23.5 cm)
0–2 in.
(0–5 cm)
1 9/16 in. (4 cm)
between the leaf
and foundation
plate
6 1/2 in.
(16.5 cm)
1/2 in.
(1.3 cm)
Leveling bolt
Foundation plate
mounting bolt
Gate leaf
(a)
Gate leaf
Foundation
plate
Hole for
electrical
conduit
(b)
To the frostline
or 18 in. (45.7
cm) minimum
Foundation plate
leg extends into the
concrete 3 5/8 in.
(9.2 cm)
Cement founda-
tion should be
16 x 12 in. (40.6
x 30.5 cm)
(3.5 cm)
(2.4 cm)
{
Figure 4. The concrete footing and 820/860 Operator in relation to the gate leaf:
(a) top view and (b) side view
