Spray gun Maintenance and Troubleshooting …

1 Maintenance & TROUBLESHOOTINGPAGE 1 Maintenance & TROUBLESHOOTINGPAGE 1 Spray gun Maintenance andTroubleshooting guide (JGA)IMPORTANT: Before using the gun for the first time, tighten the needlepacking until the needle starts to bind. Then loosen the packing nut justenough so that the needle moves following hazards may occur during the normal use of this equipment. Please read thefollowing chart before using the where hazards may where hazard how to avoid the hazardSpray Area-Fire HazardSolvent and coatings can be highlyflammable or combustible especiallywhen exhaust must be provided tokeep air free of accumulations of must never be allowed in thespray extinguishing equipment must bepresent in the Spray SprayDuring cleaning and flushing, solventscan be forcefully expelled from fluid andair passageways.

2 Some solvents cancause eye eye protectionToxic SubstancesCertain materials may be harmful ifinhaled, or if there is contact with the requirements of the MaterialSafety Data Sheet supplied by your coatingmaterial exhaust must be provided tokeep the air free of accumulations of a mask or respirator whenever there isa chance of inhaling sprayed mask must be compatible with thematerial being sprayed and Hazard-Incompatible MaterialsHalogenated Hydrocarbon solvents - forexample: Methylene Chloride and 1,1,1 -Trichloroethane are not chemicallycompatible with the aluminium which maybe used in many system chemical reaction caused by thesesolvents reacting with aluminium canbecome violent and lead to an with stainless steel fluid passagesmay be used with these solvents.

3 However,Aluminium is widely used in other sprayapplication equipment - such as materialpumps, cups and regulators, valves, all other equipment items before useand make sure they can also be usedsafely with these solvents. Read the labelor data sheet for the material you intend tospray. If in doubt as to whether or not acoating or cleaning or cleaning material iscompatible, contact your material & TROUBLESHOOTINGPAGE 2 Maintenance & TROUBLESHOOTINGPAGE 2 Spray FAULTSC onditionCauseCorrectionImproper Spray patternGun Improperly air capFluid tip obstructedSluggish needleReadjust gun, follow instructions air (see lubrication section)

4 Orloosen packing top or bottom patternMaterial build-up on air cap, partiallyplugged horn holes, centre holes or build-up on fluid tip or partiallyplugged fluid tipSoak cap or tip in suitable solvent and wipeclean. To clean orifice, use a broom strawor toothpick. Never use a wire or hardinstruments. This damages holes anddistorts Spray right or left side patternNote: To determine where material build-up is, invert cap and test Spray . If pattern shapestays in same position, the condition is caused by material build-up on fluid tip.

5 If patternchanges with cap movement, the condition is in the air centre patternToo much materialMaterial too thickReduce fluid flow by turning fluid needleadjusting screw clockwise. Reduce fluidpressure or increase atomisation or fluttering Spray fanLoose fluid tipFluid tip not seated correctly in gun headGun (with cup) tipped at excessive fluid passage or or cracked fluid tube in cup fluid in cup or pressure heavy fluid for suction or worn packing or loose packing vent on suction feed fluid inlet loose or not sealed/seatedcorrectlyFluid hose or cup not fitted correctly togun fluid inlet connectorTighten to 17 Nm (150 ibf/in)

6 Remove tip, clean components, checkcone seating on tip and gun for damage orcontaminationDo not tip excessively or rotate fluid or replaceFill cup or tankThin material or change to pressure feedLubricate or replace. TightenClean vent hole in cup to 8 Nm (70 lbf/in)Remove, check mating surfaces and re-tightenMAINTENANCE & TROUBLESHOOTINGPAGE 3 Maintenance & TROUBLESHOOTINGPAGE 3 Spray FAULTSC onditionCauseCorrectionSplit Spray patternNot enough material or too highatomisation pressureReduce air pressure or increase fluid flowby turning fluid needle adjusting screwcounterclockwise or increase fluidpressure on pressure feed bounce-backToo much atomisation air pressureGun too far from surfaceImproper technique arcing, & fanningthe gunReduce air pressureCheck distance (normally 6-8 )

7 Move at moderate pace, parallel to worksurfaceFINISH FAULTSRuns and sagsToo much material flowMaterial too thinGun tilted on an angleAdjust gun or reduce fluid pressureMix properly or apply light coatsHold gun at right angle to work and adaptto proper gun techniqueThin, sandy coarse finish drying before itflows too far from surfaceToo much air pressureImproper thinner being usedCheck distance (normally 6-8 )Reduce air pressure and check spraypatternFollow paint manufacturers mixinginstructionsThick dimpled finish orange peel . Toomuch material coarsely too close to surfaceAir pressure too lowImproper thinner being usedMaterial not properly mixedSurface rough, oily, dirtyCheck distance (normally 6-8 )

8 Increase air pressure or reduce fluidpressureFollow paint manufacturers mixinginstructionsFollow paint manufacturers mixinginstructionsProperly clean and prepareMAINTENANCE & TROUBLESHOOTINGPAGE 4 Maintenance & TROUBLESHOOTINGPAGE 4 Maintenance & TROUBLESHOOTINGPAGE 5 Maintenance & TROUBLESHOOTINGPAGE 5 GUN FAULTSC onditionCauseCorrectionAWill not sprayNo air pressure at gunInternal mix or pressure feed air cap usedwith suction feedFluid pressure too low with internal mixcap and pressure tankFluid needle adjusting screw not openenoughFluid too heavy for suction feedCheck air supply and air linesChange to proper suction feed air capIncrease fluid pressure at tankOpen fluid needle adjusting screwThin material or change to pressure spits paint when triggering onand offIncorrect needle fitted to gunExcessive needle wearExcessive fluid tip wearCheck tip/needle selection chart and fitcorrect itemReplace with new needleReplace with new fluid tipASmall air leak from air cap whengun is not triggeredAir valve contaminated and not correctlyseatingAir Valve seal damaged or missingRemove valve and

9 Thorougly clean valveshaft and seating surfacesReplaceAGun spits paint when triggering ondue to paint build-up inside air capbetween spraying operationsFluid tip not fitted correctly in gun headFluid tip/needle leakageTighten to correct torqueCheck for damage or blockageBSlow fluid leak from fluid tip andneedle seatFluid Tip internal seat scored, damaged orwornFluid needle external profile damaged orwornContamination on needle or tip matingsurfaces preventing good sealIncorrect fluid tip for fluid needle fitted togunSluggish needleTight packing nutReplaceReplaceThoroughly cleanCheck tip/needle selection chart and fitcorrect itemLubricate packingAdjustBMajor fluid leak or fluid jetting fromfluid tip and needle seatContamination on needle or tip matingsurfaces preventing good sealIncorrect fluid tip for fluid needle fitted togunFluid needle stuck or binding up Remove tip and needle and thoroughlycleanCheck tip/needle

10 Selection chart and fitcorrect itemRemove and clean fluid needle shaft, orlubricate needle packing or loosen needlepackingMAINTENANCE & TROUBLESHOOTINGPAGE 6 Maintenance & TROUBLESHOOTINGPAGE 6 GUN FAULTSC onditionCauseCorrectionBPaint build-up on fluid tipFluid tip not fitted correctly in gun headFluid tip/needle leakageTighten to correct torqueCheck for damage or blockageBPaint build-up on Air capDamaged air cap holesGradual build-up of bounce-back on gunheadReplace with new Air capThorougly cleanCSlow fluid leak from needle packingFluid needle packing worn or looseTighten or replace as necessaryDAir valve sluggish or slow to turnon/off when