Hunter Technical Support Document

I-90 Rotor Adjustment and Installation Instructions

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Adjustment, Installation Procedures

Nozzle Removal and Replacement

STEP ONESTEP TWO

Remove the logo cap, which is retained by a central Phillips screw.

The nozzle is retained in the nozzle housing by a setscrew. Back out the setscrew using the hex key on the Hunter wrench to allow for nozzle removal.

STEP THREESTEP FOUR

The nozzle is retained in the nozzle housing by a setscrew. Back out the setscrew using the hex key on the Hunter wrench to allow for nozzle removal.

Grasp the nozzle with pliers and pull to remove.

STEP FIVESTEP SIX

Insert the replacement nozzle in the housing. Press firmly to fully seat the nozzle so that it will clear the retaining setscrew.

Using the hex key on the Hunter wrench, turn the setscrew down to retain the nozzle. Replace logo cap and the central phillips screw.

Stator Ring Installation

When installing nozzles you must also correctly set the stator to ensure proper speed of rotation. Failure to correctly set the stator may cause a non-rotation condition.

STEP ONESTEP TWO

Remove the riser assembly from the body.

Remove the filter screen to access the stator.

STEP THREESTEP FOUR

The stator has a protruding tab that aligns with a pointer. Remove the stator by grasping this tab with pliers and pulling.

Replace the stator so that its pointer is set to the number agreeing with the nozzle installed.

STEP FIVE

Visually check for proper assembly of nozzles, setscrews and stator. Reverse the preparation procedure to reassemble the unit.

 

Precipitation Rate Adjustment

If you have excessively wet or dry areas, you can change the nozzle in the sprinkler to increase or decrease the precipitation rate. For dry areas, install a larger nozzle. For wet areas, install a smaller nozzle.

Note: Refer to the Nozzle/Stator Chart below for nozzle and stator settings.

Nozzle/Stator Chart
Nozzle NumberStator Position
3333
3838
4343
4848
5353
6363

 

I-90 ADV Only - Arc Adjustment

Adjustable heads are preset to approximately 180º. Sprinklers may be adjusted with water on or off. It is recommended that initial adjustment be made before installation.

Rotate the nozzle turret clockwise to the right stop. This is the fixed side of the arc. The nozzle turret must be held in this position for arc adjustments. The right stop does not change.

To Increase Arc:

  1. Insert the plastic 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 full 360º turn of the wrench increases the arc 45º.
  3. Adjust to any arc between 40º and 360º. The wrench will stop turning, or there will be a ratcheting noise, when the maximum arc of 360º (full circle) has been reached.

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 full 360º turn of the wrench will decrease the arc 45º.
  3. Adjust to any arc between 40º and 360º. The wrench will stop turning, or there will be a ratcheting noise, when the minimum arc of 40º has been reached.

 

Note: It is not necessary to disassemble the sprinkler to make adjustments.

I-90 ADV Only - Aligning the Right (Fixed) Side of the Arc

If the right side of the arc is not properly aligned, the results may be a wet walkway or a dry turf area. The right side can easily be realigned. One way to realign the right stop is to unscrew the body cap counterclockwise and remove the internal assembly from the body. Once removed, rotate the nozzle turret to the right stop, insert the internal assembly back into the body with the nozzle aligned to the right side of the area you want irrigated. At this point you realigned the right arc stop, and you can adjust the left arc to an appropriate setting.

 

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