Hunter Technical Support Document



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Hunter rotors have replaceable riser seals that may wear out over time. Sandy soils, sunken heads, or extremely hot and cold temperatures may also cause a seal to wear out prematurely.The replacement seal is available as a replacement part (P/N 181500) and can be ordered through any authorized Hunter distributor.

The new riser seal incorporates improvements that increase durability and life of service. Before turning on the sprinkler to check for leaks, necessary adjustments and proper retraction. It's also a good idea to check the final installation height to determine the sprinkler is set to grade.

Replacing the Riser Seal on a Hunter rotor


Unthread the body cap and remove the internal assembly from the pop-up body.

Place the base of the riser on a solid surface and grip the spring and riser body firmly. With the other hand, snap off the body cap—with your palm on top of the logo cap, pull up with your fingers.


While still gripping the spring and body, remove the rubber seal.

When you remove the seal, the spring's tension will be released. Remove the plastic spring and plastic springseat (if it was not pushed off by the spring).


Now that the old seal is removed, the new seal can slide over the top of the rotor's turret and onto the riser. Be sure to install the spring seat prior to the riser seal. After the new components are installed you can then reinstall the rotors body cap.

Installation Procedures, Troubleshooting, Video
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