11
Centerline of
gate leaf
Gate post
Axis of rotation
of gate leaf
Mounting box:
10 1/4 x 19 1/4 in.
(26 x 49 cm)
Cement surrounding the
mounting box or cement footing
to which box is attached
Figure 7. The orientation of the load bearing box and concrete when you
secure the load bearing box
You next need to test fit the load bearing box in the
cavity. The fit must meet the following requirements:
1. The center of the splined shaft of the pinion
must align perfectly with the axis of rotation for
the gate leaf. Use a plumb line to insure this
vertical alignment.
2. The cover of the load bearing box should be
even with the finished grade beneath the gate,
but more importantly, the top edges of the load
bearing box must be level. Use a level to insure
this horizontal alignment.
Secure the Load Bearing Box
Next you need to fix the mounting box in place if it
meets all the requirements for alignment. Precisely how
you fix the box in place will vary according to your soil
conditions and your installation site.
Example: For example, you might surround the exterior
of the mounting box with enough soil to extend 1/2 way
up the boxso that soil covers the access holes for the
electrical conduit and drainage pipe. While such soil
should be firmly packed around the box, you have to be
sure that in packing the soil you do not misalign the
center of the splined shaft of the pinion or the top edge
of the box. In fact, you should recheck all alignments
and adjust the mounting box if necessary. Then you can
pour concrete around the box and up to its top edge so
as to be level with the finished grade beneath the gate
leaf.
Example: As another example, you might use a
foundation plate set in a cement footing. Then you could
bolt the mounting box to the plate, taking care that your
bolts do not interfere with the 760 Operator yet to be
installed in the box. This method requires you to
compensate for the unevenness of the bottom of the
mounting box.
Note: No matter what your method of fixing the
mounting box in place, use sufficient concrete to hold
the mounting box in place when it is under the stresses
inherent in hydraulically swinging the gate.
No matter how you secure the mounting box, if you use
poured concrete, allow a minimum of two full days
before you install the 760 Operator inside the mounting
box.
Install the Gate Leaf Shoe
Note: Building a gate leaf shoe is not absolutely
necessary. It is a method that will work in most
applications. However, if you wish to weld the splined
collar directly to the gate or attach it by some other
means, feel free to do so.
Caution: Do not install the gate leaf shoe, even for test
fitting, until any concrete beneath or around the
mounting box has had a chance to set for a minimum of
two full days.
If the vertical distance between the finished grade under
the gate and the bottom of the gate leaf is more than
2 3/8 in. (see Figure 4), you need to do one of the
following:
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