Field Tips for Dialing Hunter I-20 Rotor Arcs

Hunter I-20 rotors show up on a lot of residential and light commercial turf. Arc adjustment is straightforward when you follow the factory orientation: one side is the fixed edge of the arc.

If the head will not ratchet, stop. Forcing the turret is how you buy a new body. Pull the head, check for grit in the filter screen, and confirm nozzle size matches the radius you need — a worn nozzle throws short and looks like a bad arc setting.

Keep a nozzle tree on the truck. Swapping a 2.0 for a 3.0 often fixes "dry corner" complaints faster than adding another head.