Hunter rotary sprinklers operate on a “gear drive” system. When in operation, water turns a small turbine in the base of the sprinkler, which drives a series of gears that cause the head to rotate. The Hunter gear drive mechanism is sealed from dirt and …

… Adjustable heads are preset to approximately 180 degrees. The PGP-ADJ is adjustable from 40-360 degrees. The PGP Ultra is adjustable from 50-360 degrees. Sprinklers may be adjusted with water on or off. It is recommended that initial adjustments be made …

Rotary sprinklers require a certain amount of pressure and flow to operate properly. If the rotor does not receive the pressure it needs to pop up a leaky head will result. Here are some things to look for when a rotor doesn't pop up properly: Problem:   …

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 riser seal is available as a single replacement part (P/N 181500) …

Residential Rotors - Rotor Nozzle Installation Procedure …