Adjusting the Spray Pattern Adjustment on a Hunter Sprinkler Head

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hunter sprinkler head adjustment

Adjusting the Spray Pattern Adjustment on a Hunter Sprinkler Head

Sprinklers are an invaluable way to ensure your lawn and garden remain watered, but every yard differs and may require adjustments in order to reach all areas equally.

Insert the plastic key end of a Hunter wrench (available at home improvement stores that carry it) into the adjustment socket at the top of its head and locate your left side arc to increase or decrease it as desired. Rotate until you find what fits.


Sprinklers provide an efficient means of watering your lawn or garden, but only when properly configured. Installing or adjusting Hunter rotors requires some minor tweaks in order to work efficiently; such as adjusting radius and arc of head. By taking these steps you’ll maximize the effectiveness of rotary sprinklers as well as ensure even coverage in your yard.

Adjust the radius adjustment. This setting determines how far nozzle sprays out from its base, and can be altered by turning the center screw of your nozzle clockwise or counterclockwise to increase or decrease it accordingly. Adjusting this up to 25% may allow water to flow over your yard edges without overspray.

Once you’ve adjusted the radius, it’s time to move onto arc adjustment. To do this, insert the plastic key end of your Hunter wrench into the adjustment socket on top of the rotor and make adjustments with care, using the appropriate key size while keeping your wrench nearby so as to not accidentally twist your nozzle in an undesirable way.

Next, insert the key into the adjustment socket and turn it until each full 360-degree turn widens your arc by 90 degrees – 40 to 360 degrees is easily achievable! When you have achieved maximum arc, either it will stop turning or there will be a ratcheting noise as your key stops turning or both will occur simultaneously.

One of the key considerations when it comes to adjusting rotary sprinklers is making sure you do it without water running, since doing so could damage its rotor head if twisted too far and result in expensive repairs.


Sprinklers can be an invaluable asset when it comes to maintaining lush lawns or watering gardens, but only when they can reach their target location. Luckily, it’s relatively simple to adjust the radius and arc settings on your sprinkler head for optimal coverage.

To adjust an arc, simply hold onto the nozzle turret and rotate it counterclockwise until reaching its preset left stop – this serves as the starting position for all subsequent adjustments and must remain within this limit throughout. Adjustments up to 360 degrees may be made; any more could lead to overspraying and overlap leading to wasted water waste and runoff.

Adjust the arc by making small increments; once you reach your desired arc, reinstall and test your sprinkler head for proper functioning.

Adjustments to rotary head arcs can be made with or without water flowing, using either the plastic key end of a Hunter wrench or flat screwdriver as an instrument to turn the arc adjustment screw clockwise to increase it and counterclockwise to decrease it.

Once your arc has been adjusted to its minimum setting, either its screw will stop turning or produce a ratcheting sound to indicate that you have found its lowest setting. If further reduction is desired, add a smaller radius nozzle onto your sprinkler head in order to achieve desired results.

Spray heads allow users to adjust the arc by grasping and twisting the nozzle left, but be wary not to overdo it or it may come loose and cause irreparable damage to your sprinkler head. Once adjusted, tighten the range screw to ensure that the arc remains set; if too high an arc has been set you can spin back to right with your hands.

Spray Pattern

Adjusting the spray pattern of a Hunter sprinkler head is key to maintaining healthy and beautiful grass. Adjusting your sprinklers correctly will prevent overwatering, underwatering and dry patches; regardless of whether you’re watering a small strip beside a driveway or an intricate flower garden – proper adjustments make an impactful difference in watering effectiveness.

No matter the type of sprinkler, making adjustments is usually straightforward. This is especially true for popular Hunter rotary sprinkler models which feature simple tools for quick adjustment – included as part of their head or sold separately. In this article we’ll go through the basic steps involved with adjusting these models while offering advice that will ensure optimal results are obtained.

First, turn off the water supply to your sprinkler system, then locate and turn the adjustment screw on each sprinkler head near its Hunter logo. Use a screwdriver or sprinkler key to turn this screw clockwise if you want to reduce radius; to increase it counterclockwise.

Adjust the precipitation rate and nozzles on your sprinkler heads to achieve exactly the coverage that meets your needs. Although this requires using additional tools, learning them quickly is straightforward and is just as effective in getting you covered as adjusting arc and radius settings.

Keep in mind when making adjustments to your sprinklers that being careful not to over-tighten can save the internal mechanism from becoming damaged and lead to issues later. A good rule of thumb for making adjustments with Hunter sprinkler keys would be turning them slowly until adjustments have been completed and tested before finalizing changes – to make sure everything is functioning as it should!


Some sprinkler heads become misalign, particularly during the off-season, causing them to spray water onto sidewalks, driveways or other non-essential areas that do not need it. This issue can usually be rectified by adjusting either the arc or radius of a sprinkler head – simply inserting the plastic end of your Hunter wrench into its lifting socket and turning 90 degrees can then pull up by key to access its nozzle socket; you may increase arc by turning clockwise the nozzle-retainer/range-adjustment screw whereas decreasing it can reverse this procedure.

The nozzle-range screw can also be used to adjust the radius of a sprinkler head. To achieve a smaller radius, turn it clockwise – this can decrease it up to 25%! For larger radius needs, install larger nozzles – though this may affect precipitation rates as well.

Rotor adjustment should usually be carried out while an irrigation system is running, with its head raised in order to make any adjustments more efficiently and without repeatedly restarting and stopping water flow. Before making adjustments, however, it’s a good idea to double check that no pipes have broken and that there is adequate pressure throughout all zones piping; otherwise rotor pop-up could fail and result in leaky heads.

Before making adjustments to a rotary sprinkler head, it’s essential to understand what steps are involved and the appropriate tools for this process. If you are unfamiliar with this process, hiring a professional may be your best bet; otherwise be patient when tightening any bolt or screw as overtightening can damage its head or cap. A hex key may come included with many Hunter sprinkler models; you can purchase additional ones online. When working with Hunter rotary sprinklers with screwdriver style heads (Hunter), ensure that use an appropriate hex key fitting the type of head (Hunter models have screwdriver style heads), so use an appropriate hex key that fits that matches its type of head when making adjustments.

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