The T- Bird is Rain Bird’s first gear driven sprinkler. It is designed to operate in the 25-60 PSI range and cover a radius of 16-30’. It has a pressure compensating flow bushing, resulting in matched precipitation and pressure activated wiper seal.
To increase the arc - Keep in mind that the part circle T- Bird comes preset at 180°. Pull up on the stem, and while holding the textured area, rotate the nozzle until it is turning to the right (clockwise). Slide the vandal collar out of its groove. Push down on the nozzle, and rotate it to the right until the desired arc is obtained. Pull up slightly on the nozzle, making sure to replace the vandal collar when finished.
To decrease the arc - Pull up on the stem, and while holding the textured area, rotate the nozzle until it just trips at the left stop. Slide the vandal collar out of its groove. Push down on the nozzle, and rotate it to the left (counter-clockwise) until the desired arc is obtained. Pull up slightly on the nozzle, and again be sure to replace the vandal collar. Failure to replace the collar will cause the riser to stay up just a bit. (If it doesn’t seal completely, the famed sprinkler harvester comes along and eats the sprinkler!)
Over tightening the nozzle - This usually occurs during the initial installation. The proper way to nozzle the T- Bird is to place the nozzle into the cap assembly and begin to turn it to the right (clockwise). After feeling the threads engage, pull the stem up and grasp the area of the riser assembly (this area is textured to ensure a positive grip when wet). This is the most critical time of the installation process, continue to tighten the nozzle only until it is snug! If the nozzle is over tightened either the clutch will break, or the omega springs or the gears inside the gear assembly will pop off. In this case, the old saying “the tighter, the better” doesn’t apply!
Cap to body leaks - Grit getting caught between the wiper seal and riser. This can cause water to leak from between the riser and cap ( this is also known as blow by). Steps have been taken to prevent this by making the wiper seal deeper and adding a tall spring support. These additions make the wiper seal stronger, thereby preventing grit from entering this area.