Miller Nitro 7380 - Page 231

6-WORKINGOPERATIONS
NozzleControlValves(NCV)troubleshoot-
ing
PluggedNozzleControlValves(NCV)canbeclassiedintotwocategories;plungerblockage,andplungerstuck.
Plungerblockageoccurswhenlargerdebriscatchesbetweentheoriceandplungerseal.Thisisthesmallestow
passagewithintheNozzleControlValve(NCV).Stuckplungersoccurwhensmallerdebriscollectsaroundthebarrel
oftheplungerandbindstheplungerinplace.Symptomsofablockedorstuckplungerare;constantspray,and
drippingwhenthenozzleisshutoff.PinchedorsplitO-ringswillalsocausethenozzlestodripwhenshutoff.
OperatingapluggedNozzleControlValve(NCV)foranextendedperiodoftimemayresultinaNozzleControlValve
(NCV)coilfailure.ImmediatelycleananypluggedNozzleControlValves(NCV).Ifpluggednozzlesornozzlevalves
areafrequentprobleminaparticularboomsection,inspectthemachine’sboomlterscreensforpluggedordamaged
screens.An80meshscreenisrecommendedtoreduceoccurrenceofpluggedvalves.Checkthemeshsizeofthe
strainersandreplacestrainersiftheyaretoocoarseordamaged.ReferenceIntelliSpray™operatormanualfor
additionalnozzlesolenoiddiagnosticsandtroubleshootingdetails.
NozzleControlValve(NCV)cleaning
WARNING
Chemicalhazard!
Wearprotectiveclothingandafaceshieldwhenworkingwithchemicals.Donotallowchemicalsto
contactskinoreyes.Alwaysfollowthechemicalmanufacturer'sinstructions.
Failuretocomplycouldresultindeathorseriousinjury.
W0052A
WARNING
Pressurizedsystem!
Systemisstillunderpressure.Releasepressureaccordingtoinstructionsinthismanual.
Failuretocomplycouldresultindeathorseriousinjury.
W1044A
1.Turntheratecontrolleroff.
2.Disengagetheproductpump.
3.Turnofftheengineandremovethekeyfromtheunit.
4.Releasethepressurefromthesprayerlinesbyslowly
looseningasprayerbarendcap,openingaushing
valve,orsimilartting.
NOTE:Beforeremovingorinstallingnozzlevalves,
ensurethatthepressurehasbeenreleasedfromthe
sprayerlines.
5.Loosentheynut(1)andremovethenozzlecontrol
valve(A)fromthenozzlebody.
RAIL16SP00353AA1
6-45