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Problem
7. Mechanical failure
to retract
8. Non-rotation/
Stalling / Tripping
9. Sprinkler rotates
too slowly
115-E Series Rotors Operations & Maintenance Manual
Possible Cause
Plugged or damaged nozzle
PRS out of adjustment
PRS not holding pressure
setting
Broken valve filter screen
Blockage in tubes or case
probe
Tube crimped or pinched
Debris obstructing internal
assembly screen
Inlet rock screen clogged
Debris in PRS assembly
Retract spring may be
installed with an end coil
doubled over, preventing
internal retraction
Sand or rock particles may
have wedged between the
bearing guide and the riser
Stator missing, or wrong
stator setting
Debris or algae clogging the
internal assembly screen
Nozzle clogged
Inlet screen clogged
Arc was misadjusted and left
in neutral
Arc setting too small
Insufficient water pressure
Improper nozzle/stator
combination
Blinded filter screen
21
Correction
Clean or replace nozzle.
Adjust pressure by turning adjusting screw using a
screwdriver.
Replace PRS cartridge in selector.
Replace screen and clean out valve assembly.
Locate and clear blockage.
Repair or replace tube.
Clean internal assembly screen.
Remove case. Clean and reinstall rock screen.
Clean out any debris between poppet and lower stem.
Remove internal assembly and without disassembling,
compress the spring down until you free up the end coil.
Reseat the end coil and reinstall the internal assembly.
Pull the internal assembly and clean. Brush any rocks or
debris away from the head of the rotor.
Remove internal assembly. Check for proper stator
setting.
Clean internal screen.
Clean nozzle.
Clean inlet screen. This may be difficult if debris has
fallen back down out of sight. Examine and clean
thoroughly.
Turn the nozzle housing through the next trip point.
Reset arc to no less than 45 degrees.
See solutions for Problem #6 "Low Pressure."
Check for proper stator setting and nozzle/stator
combinations. Clean as needed.
Clean as needed.
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