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- Arc adjustment direction
- To service riser: screw accessed through membrane here (caution: under spring tension)
- Specific model
- Flow direction arrow & nozzle-retainer/range-adjustment screw
- Lift-up socket
- Arc adjustment
![](/sites/default/files/styles/paragraph_image_right/public/support_i40_arc-adjust-step1.gif?itok=DiFk0Cle)
All I-25 Ultra adjustable arc sprinklers are preset at approximately 180°. The I-25 can be adjusted from 50-360 degrees. Sprinklers may be adjusted with water on or off. It is recommended that initial adjustment be made before installation.
- Using the palm of your hand, rotate the nozzle turret counterclockwise to left stop to complete any interrupted rotation cycle.
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Rotate the nozzle turret clockwise to right stop. This is the fixed side of the arc. The nozzle turret must be held in this position for all arc adjustments.
![](/sites/default/files/styles/paragraph_image_right/public/support_i40_arc-adjust-increase.gif?itok=3s2T3OQd)
To Increase Arc
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Insert the key end of the Hunter wrench into the adjustment socket.
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While holding the nozzle turret at the right stop, turn the wrench clockwise. Each 360° turn of the wrench increases the arc 45°.
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Adjust to any arc between 50° and 360°.
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Wrench will stop turning, or there will be a ratcheting noise, when the maximum arc (360°) is reached.
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When set to 360°, the sprinkler will rotate continually counterclockwise.
![](/sites/default/files/styles/paragraph_image_right/public/support_i40_arc-adjust-decrease_0.gif?itok=cFOuj2nk)
To Decrease Arc
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Insert the key end of the Hunter wrench into the adjustment socket.
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While holding the nozzle turret at the right stop, turn the wrench counterclockwise. Each 360° turn of the wrench decreases the arc 45°.
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Adjust to any arc between 50° and 360°.
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Wrench will stop turning, or there will be a ratcheting noise, when the minimum arc (50°) is reached.
Insert the hex end of the Hunter wrench into the nozzle-retainer/range-adjustment screw. Turn the screw clockwise into the stream of water to decrease the radius, or counterclockwise to increase the radius.
Where excessively wet or dry areas are a problem, the precipitation rate may be adjusted. Simply replace the existing nozzle with a larger one to increase or a smaller one to decrease the rate of precipitation.
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