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Manafacture: Toro File size: 2.25 mb File name: Language of manual:

– Replace. (c) Damaged riser. – Replace. Poor distribution pattern (a) Nozzle plugged with debris. – Clean or replace nozzle. (b) Nozzle orifice damaged. – Replace nozzle. (c) Low operating pressure. – Determine why system overloaded and correct. 5 A U T O O N Figure 12 100 PSI (7.0 kg/cm2) 80 PSI (5.6 kg/cm2) 65 PSI (4.6 kg/cm2) 50 PSI (3.5 kg/cm2) Main Valve PROBLEM Valve won't close (Electric ) Valve won't close (Hydraulic) Valve won't open (Electric) Valve won't open (Hydraulic) Sprinkler Weeping (Slow leak in valve) Several valves on different stations fail to close (Hydraulic) POSSIBLE CAUSE – CORRECTIVE ACTION (a) Continuous 24 VAC to sprinkler. – 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. (a) Leak in control tubing. – 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. (a) Control (field) wires severed. – 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. (a) Plugged controller discharge line or discharge port in pilot valve. – Verify by checking for discharge at discharge line when station is activated. If no discharge, refer to Controller Service Manual. (a) Damaged or blocked valve seat. – Remove blockage and, if necessary, replace valve assembly. (b) Damaged piston seal or piston assembly. – Replace valve assembly. (c) Low pressure on supply line . – Check for low pressure reason and correct. (d) Elevation of normally closed sprinkler exceeds 75' (22.9 m) differential. (a) Control tubing leak which lowers supply pressure to other stations. – Turn controller from station to station until a station is reached where only valves on that station stay open. The leak would be in the tubing on that station. Isolate and repair. (b) Leak in supply line to controller. – Verify by checking pressure in all control lines. (c) Leak in controller pilot valve. – Verify by constant discharge from controller. (d) Plugged supply line filter. – Replace filter if more than 3 psi (0.21 bar) differential exists. 6 7 Service Procedures ______________________________________________________________ Servicing Sprinkler Mechanism Note: Refer to Figure 13 for the following procedure. 1. Remove the cap screw (1) and cap (2). Note: During reassembly, ensure the cap is correctly installed with the Toro Logo positioned over the main nozzle (10). 2. Insert the hooked end of the multi-purpose tool (P/N 995-83) into the snap ring slot (3). Pull the snap ring inward towards the sprinkler assembly, then upward to remove from the groove in body. Note: During reassembly, ensure the snap ring is correctly installed and fully seated in the sprinkler body. 3. Insert the hooked end of the tool into the slot provided in the nozzle base above the right intermediate nozzle (9). Pull the riser assembly until enough clearance to handle. Hold onto the riser body (13) and carefully extract it from the sprinkler body. CAUTION: The seal/retainer (4) will eject (caused by the decompressing spring [5]) as it clears the sprinkler body. 4. Three small tabs are provided on the edge of the multi-purpose tool. Insert tabs into the debris filter screen (17). Holding the plastic base of riser assembly, turn the screen counterclockwise to remove. 5. Remove the variable stator (16) from riser assembly. 6. Loosen the drive assembly retaining screw (14) 6–7 turns and pull the drive assembly (15) using a pair of pliers. See Figure 14. Note: Do not remove the retaining screw completely as it is easily misplaced. CAUTION: When removing or installing the drive assembly, do not use the turbine to pull t...

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