10
Rack and Pinion Operator
Mounting the Pinion:
As shown in Figure 7, place the
operator on the foundation plate with the pinion facing
the gate and with approximately 1-3/8 in. (35 mm)
between the inside edge of the gate frame and the center
of the drive pinion.
While placing the operator on the foundation plate,
thread the electrical wiring through the conduit in the
operator as shown in Figure 5.
Fit one 1/16-in. (1.5 mm) thick sheet-metal shim under
each mounting bracket in order to keep the
operator slightly raised. These shims are setting the
height of the rack and will be removed later to provide
operating clearance between the rack and the pinion.
Spot weld the factory-fitted mounting brackets to the
foundation plate as shown in Figure 8. (You will
remove these spot welds later, so do not over weld.)
Installing the Rack:
Manually disengage the operator
motor with the Manual Release (see Fig. 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 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 the spacer that is nearest
the pinion to the gate.
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.
Now place another rack section end next to the end of
the rack just installed. Be sure that the two sections are
aligned and level and that the teeth match perfectly. Use
another piece of rack, upside down, to check and set the
alignment of the teeth as shown in Figure 10.
Repeat the process of spot welding the spacers of this
rack section as you did on the first section. Continue
this process for each section of rack.
Gate
Outside
Inside
1 3/8 in.
(35mm)
Chain bracket
U Bolt
(2 req.)
(2 req)
Chain
Figure 4. Mounting the chain operator, top view
Figure 5. Thread the electrical wiring up
through the operator in the conduit provided
Idler sprocket
Drive sprocket
Chain
Figure 6. How to install the chain around the
sprockets
Summary of Contents for 746 ER CAT
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