If you’ve lost your Hunter wrench key, no worries! You can actually use a normal 3/32 Allen key to make this adjustment. [3] X Research source You can make this adjustment with the water on or off.
Your hex bar will stop turning when you’ve reduced the radius by 25%. You can’t reduce the radius more than this.
You may need to adjust the radius back and forth to get your desired sprinkler coverage. If you can’t get the radius you want, switch out your nozzle to a bigger nozzle for a wider radius or a smaller nozzle for a smaller radius. [6] X Research source You can find instructions on how to do this in the Precipitation Rate section below.
You can adjust your sprinkler with the water on or off.
You can remove the Hunter wrench while the sprinkler head is pulled up. You’ll actually need it to make adjustments to the left. You can adjust the sprayer toward the right without the key.
Do this first so you know how far you need to adjust the sprinkler arc.
If your base won’t tighten any more, grasp the entire sprinkler cap and turn it clockwise to loosen it. Then, lift the inner assembly out of the sprinkler base. Spin the cap all the way to the right, then put it back in the base with the arrow pointing at your right stop. Twist the cap clockwise to tighten it into the base. Your arrow should be pointing at your right stop. [14] X Research source
You may be able to make plus/minus adjustments by inserting a 1⁄4 inch (0. 64 cm) screwdriver or hex wrench into the slot. [16] X Research source However, Hunter Industries states that you need the key to make this adjustment. [17] X Research source
The highest you can widen your arc is 360 degrees. When you reach this point, the key will either stop moving or you’ll hear a grinding sound. Clockwise is the plus, or positive, direction.
Counterclockwise is the minus, or negative, direction.
You won’t be able to change the nozzle without your Hunter wrench key.
If the bar doesn’t move, you can go on to the next step. The arrow points to where your nozzle is, so the nozzle will be just below the arrow.
If you prefer, you can remove the nozzle by hand by grasping the edge of the nozzle with needle-nosed pliers and pulling outward. Remember, the nozzle is just below the arrow on your sprinkler cap. Keep the nozzle if it’s not damaged, as you can reuse it later.
If you go too far, just spin the sprayer back toward the left.
You don’t need any special tools to adjust spray sprinklers. If you go too far, just twist it back the other way.
If the arc gets too wide, simply spin the nozzle back counterclockwise.
