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Toro 640 series industiral sprinklers are difficult to adjust by virtue of the fact that the gears are specifically set at an assigned angle. This differs from other well-known irrigation companies such as Rainbird, who have models similar to the Toro version, but have a special slot to adjust the turning radius. Although you can't really adjust the Toro head, you can order special preset angles from the manufacturer, i.e 170 degrees, 270 degrees, in addition to the regular 180 degrees, 360, etc. To ensure that you have the correct angle, adjust the left side of the sprinkler to the desired angle, (you can see a small arrow etched in the sprinkler.)

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