5
System Troubleshooting (continued)
Sprinklers
Possible equipment failures with causes and corrective action are listed below.
PROBLEM
POSSIBLE CAUSE – CORRECTIVE ACTION
1.
Sprinkler won't rotate
(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.
2.
Head sticks up
(a) Dirt in riser assembly - Flush out. (See Flushing Procedure.)
(b) Damaged riser - Replace.
3.
Poor distribution pattern
(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.
4.
Valve won't close
(a) Leak in control tubing - Isolate and repair.
(Hydraulic 69X-01-XX)
(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.
5.
Valve won't open
(a) Plugged controller discharge line or discharge port in pilot valve -
(Hydraulic 69X-01-XX)
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.
6.
Valve won't close
(a) Leak in pilot valve assembly - Replace pilot valve assembly.
(Electric 69X-06-XX)
(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.
7.
Valve won't open
(a) Control (field) wires severed - Isolate and repair.
(Electric 69X-06-XX)
(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.
8.
Valve leaks
(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.
9.
Several valves on different
(a) Control tubing leak which lowers supply pressure to other stations -
stations fail to close
Turn controller from station to station until a station is reached where
(Hydraulic 69X-01-XX)
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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