■ Sprinkler Assembly
PROBLEM | POSSIBLE CAUSE – CORRECTIVE ACTION | |
SPRINKLER WON'T ROTATE | (a) | Debris wedged between stator and turbine. |
|
| – Remove obstruction. |
| (b) | Drive assembly defective. |
|
| – Replace drive assembly. |
| (c) | Nozzle base assembly defective. |
HEAD STICKS UP |
| – Replace nozzle base assembly. |
(a) | Dirt in riser assembly. | |
|
| – Flush out. (See Flushing Procedure on page 11.) |
| (b) | Damaged or missing return spring. |
|
| – Replace. |
| (c) | Damaged riser. |
POOR DISTRIBUTION PATTERN |
| – Replace. |
(a) | Nozzle plugged with debris. | |
|
| – Clean or replace nozzle. |
| (b) | Nozzle orifice damaged. |
|
| – Replace nozzle. |
| (c) | Low operating pressure. |
■ Main Valve |
| – Determine why system overloaded and correct. |
|
| |
PROBLEM | POSSIBLE CAUSE – CORRECTIVE ACTION | |
VALVE WON'T CLOSE | (a) | Continuous 24 VAC to sprinkler. |
(Electric ) |
| – Check controller for voltage source. |
| (b) | Leak in pilot valve assembly. |
|
| – Replace pilot valve assembly. |
| (c) | Plugged supply screen on piston. |
|
| – Clean or replace screen. |
| (d) | Manual control selector on pilot valve assembly turned to "ON" position. |
|
| – Turn to "AUTO" position. |
| (e) | Plunger movement restricted. |
|
| – Inspect and clean or replace. |
| (f) | Valve cylinder misaligned with sprinkler body communication tube. |
|
| – Remove valve assembly and install correctly. |
| (g) | Foreign object keeping valve from seating. |
|
| – Remove, clean and check valve for damage. Replace if necessary. |
| (h) | Damaged piston seal or piston assembly. |
|
| – Replace valve assembly. |
VALVE WON'T CLOSE | (a) | Leak in control tubing. |
(Hydraulic) |
| – Isolate and repair. |
| (b) | Pilot valve leak in controller. |
|
| – Confirm by observing constant dripping from discharge line of controller. |
|
| Refer to Controller Service Manual. |
| (c) | Valve cylinder misaligned with sprinkler body communication tube. |
|
| – Remove valve assembly and install correctly. |
| (d) | Foreign object keeping valve from seating. |
|
| – Remove, clean and check valve for damage. Replace if necessary. |
| (e) | Damaged piston seal or piston assembly. |
|
| – Replace valve assembly. |
VALVE WON'T OPEN | (a) | Control (field) wires severed. |
(Electric) |
| – Isolate and repair. |
| (b) | No power to controller. |
|
| – Establish controller power. |
| (c) | No power from controller to solenoid. |
|
| – Check for blown fuse and replace. |
| (d) | Manual control selector on pilot valve assembly turned to "OFF" position. |
|
| – Turn to "AUTO" position. |
| (e) | Pilot valve solenoid inoperative. |
|
| – Remove and replace. |
| (f) | Pilot valve plunger movement restricted. |
|
| – Inspect, clean and/or replace. |
| (g) | No supply from main valve. |
– Debris in control tube, main valve assembly and/or communication passages in body. Flush thoroughly.
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