I have Rainbird popup sprinklers and bush nozzles (nozzles mounted on water lines higher then bushes....). I find that I adjust the Bush nozzles to spray OK.....then a few days later there is No Spray coming out. I have cleaned all screens, the nozzles are fairly new......popups in the same zone work fine. Water pressure is constant so that is not the cause.
Thoughts?
Don't throttle down the nozzles - either pick the correct size for your application, or obtain the Rainbird PCS screens to restrict flow to the nozzles.
The plastic nozzles to that. They're designed to only be turned down about 20%. If you adjust them too low, they'll spray just fine, then when you turn them on the next time little or nothing comes out. Like Boots said, choose another nozzle. You're probably turning down 15 foot spray patterns. Buy some 8 or 10 footers or whatever suits the situation.