Hunter Technical Support Document

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Commercial Rotors - I-25 Rotor Adjustment Instructions

I-25 Rotor Adjustment Sockets
  1. Arc adjustment direction
  2. To service riser: screw accessed through membrane here (caution: under spring tension)
  3. Specific model
  4. Flow direction arrow & nozzle-retainer/range-adjustment screw
  5. Lift-up socket
  6. Arc adjustment
Arc Adjustment

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.

  1. Using the palm of your hand, rotate the nozzle turret counterclockwise to left stop to complete any interrupted rotation cycle.
  2. 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.

To Increase Arc

  1. Insert the key end of the Hunter wrench into the adjustment socket.
  2. While holding the nozzle turret at the right stop, turn the wrench clockwise. Each 360° turn of the wrench increases the arc 45°.
  3. Adjust to any arc between 50° and 360°.
  4. Wrench will stop turning, or there will be a ratcheting noise, when the maximum arc (360°) is reached.
  5. When set to 360°, the sprinkler will rotate continually counterclockwise. 

To Decrease Arc

  1. Insert the key end of the Hunter wrench into the adjustment socket.
  2. While holding the nozzle turret at the right stop, turn the wrench counterclockwise. Each 360° turn of the wrench decreases the arc 45°.
  3. Adjust to any arc between 50° and 360°.
  4. Wrench will stop turning, or there will be a ratcheting noise, when the minimum arc (50°) is reached.
Radius Adjustment

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.

Precipitation Rate Adjustment

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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