11
(a)
Distance between gate
and limit switch sensor:
1 3/8 in. (3.6 cm)
2 3/8 in. (6 cm) between
the bottom of the operator
and ground level
2 3/8 in. (6 cm) between the edge of
the gate and the body of the operator
(not the surface of the pinion)
4 3/4 in. (12.1 cm) between
the top of the rack and the
bottom of the 844 Operator
Distance between limit switch plate
and limit switch sensor:
3/16 in. (0.5 cm) maximum
(b)
Gate
Outside
Inside
1 3/8 in.
(35mm)
Chain bracket
(2 required)
U Bolt
(2 required)
Chain
Figure 7. Mounting the operator: (a) side view of rack and pinion version and (b) top view of chain
version
Installing the Rack: Manually disengage the operator
motor using the Manual Release (see Figure 2) and
open the gate by hand as far as possible. Fit the spacers,
washers and bolts on the rack sections as shown in
Figure 9. The bolts should be centered in the slots of the
rack sections.
With the gate in the fully open position, lay a section of
rack on the pinion. Engage the teeth properly and make
sure that the end of the rack is even with the end of the
gate and that the rack is level. Spot weld to the gate the
spacer that is nearest the pinion.
Pull the gate toward the closed position until the pinion
is directly under the spacer on the opposite end of the
rack section and spot weld that spacer. Next you can
spot weld the center spacer.
Idler sprocket
Drive sprocket
Chain
Figure 8. Install the chain around the sprockets
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