Abstract: An actuator assembly for a rotatable sprinkler head includes a base supported for rotation on a stationary platform assembly, the actuator assembly comprising a hub mounted for rotation on a shaft supported in the base; a lever arm pivotally mounted at one end to the hub and extending downwardly toward a stop plate assembly on the platform assembly, the lever arm having a free end extending toward the stop plate assembly; the stop plate assembly configured to define two or more arcuate paths of travel for the lever arm, the paths being radially offset relative to the hub; and wherein the lever arm is adjustable to locate the free end in any of the two or more arcuate paths of travel.