Variable arc - As stated above, the adjustment screw must be returned to the locked (LKD) position when the arc adjustment procedure has been completed. Failure to do so may allow the arc to change. The stem should also be inspected to determine if it is of current design. A prior version had a slip clutch built into the stem. Refer to the water distribution section for further information.
Water distribution - The current design for R-70 nozzles are referred to as Phase . This nozzle is easily identified from previous series, because:
“Rain Bird” is now stamped on the top of the nozzle.
The nozzle color coding, signifying the nozzle size, visible from the top.
Be aware that several years ago, there was a different version of the stem in the R-70. The current stem has two tabs that protrude up from the top of the stem 180° apart from each other (refer to the drawing below). When installing the Phase nozzles on the old style stem, it is possible that as the nozzle engages, the fixed left arc will change. In order to correct this problem, it is necessary to replace the stem with the new style. The stem must be replaced before the Phase nozzle is installed on the old stem, as damage may occur to the nozzle. Contact your inside sales person for more information.