Toro 850S Sprinkler User Manual


 
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.
Replace nozzle base assembly.
HEAD STICKS UP (a) Dirt in riser assembly.
Flush out. (See Flushing Procedure on page 11.)
(b) Damaged or missing return spring.
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.
Main Valve
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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