Toro 690 Series Installation & Service Instruction page 5

System Troubleshooting (continued)
Sprinklers
Possible equipment failures with causes and corrective action are listed below.
PROBLEM
1. Sprinkler won't rotate
2. Head sticks up
3. Poor distribution pattern
4. Valve won't close
(Hydraulic 69X-01-XX)
5. Valve won't open
(Hydraulic 69X-01-XX)
6. Valve won't close
(Electric 69X-06-XX)
7. Valve won't open
(Electric 69X-06-XX)
8. Valve leaks
9. Several valves on different
stations fail to close
(Hydraulic 69X-01-XX)
All manuals and user guides at all-guides.com
POSSIBLE CAUSE – CORRECTIVE ACTION
(a) Stator too large for nozzle - Use proper nozzle.
(b) Debris wedged between stator and turbine - Remove obstruction.
(c) Drive assembly defective - Replace with new drive assembly.
(a) Dirt in riser assembly - Flush out. (See Flushing Procedure.)
(b) Damaged riser - Replace.
(a) Nozzle plugged with debris - Clean or replace nozzle.
(b) Nozzle orifice/stream straightener damaged - Replace nozzle.
(c) Low operating pressure - Determine why system overloaded and correct.
(d) Head misaligned during installation (two-speed only) - Realign properly.
(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) Foreign object keeping valve from seating - Remove, clean and check
valve for damage. Replace if necessary.
(d) Damaged piston seal or piston assembly - Replace valve assembly.
(e) Valve not properly communicated to tube in body - Reassemble if
necessary.
(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.
(b) Water supply to sprinkler closed off - Determine if closure is shut-off
valve or blockage and correct.
(a) Leak in pilot valve assembly - Replace pilot valve assembly.
(b) Plugged supply screen on piston - Clean or replace screen.
(c) Manual control selector on pilot valve assembly turned to "ON" position -
Turn to "AUTO" position.
(a) Control (field) wires severed - Isolate and repair.
(b) Defective solenoid - Replace solenoid.
(c) No power to controller - Establish controller power.
(d) No power from controller to solenoid - Check for blown fuse and replace.
(e) Manual control selector on pilot valve assembly turned to "OFF" position
- Turn to "AUTO" position.
(f) No supply from main valve and piston - Remove supply tube from supply
port. If no supply port, repair valve and piston assembly.
(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 on hydraulic NO sprinklers - Check for low
pressure reason and correct.
(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 on controller -
Refer to Controller Service Manual.
(d) Plugged supply line filter - Replace filter if more than 3 psi differential exists.
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