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EN
TROUBLESHOOTING
CONDITION
Heavy top or bottom pattern
Heavy right or left side pattern
Heavy center pattern
Split spray pattern
Jerky or fluttering spray
Will not spray
Excessive overspray
(spray mist)
Fluid leaking from packing nut
Fluid leaking or dripping from
front of gun
Runs and sags
Thin, sandy coarse finish.
Drying before it flows out
Thick, dimpled finish (orange
peel). Too much material
Excessive fog
Unable to get round spray
* Most common problem.
CAUSE
Horn holes plugged.
Obstruction on top or bottom of fluid tip.
Cap and/or tip seat dirty.
Left or right side horn holes plugged.
Dirt on left or right side of fluid tip.
Remedies for top-heavy, bottom-heavy, right-heavy and left-heavy patterns:
1) Determine if obstruction is on cap or fluid tip. Do this by making a test pattern. Then, rotate cap
one-half turn and spray another pattern. If defect is inverted, obstruction is on air cap. Clean air cap
as previously instructed.
2) If defect is not inverted, it is on fluid tip. Check for a fine burr on edge of fluid tip. Remove with
#600 wet or dry sand paper.
3) Check for dried material just inside opening. Remove by cleaning.
Material flow exceeds air cap's capacity.
Atomizing pressure too low.
Material too thick.
Fluid adjusting knob turned in too far.
Atomization air pressure too high.
*Loose or damaged fluid tip/seat.
Material level too low.
Container tipped too far.
Obstruction in fluid passage.
Loose or broken fluid tube or fluid inlet nipple.
Dry or loose needle packing nut.
No air pressure at gun.
Needle adjusting screw not open enough.
Too much atomization air pressure.
Gun too far from work surface.
Improper stroking (arching, gun motion to fast).
Gun out of adjustment.
Packing nut loose.
Packing worn or dry.
*Foreign matter in tip.
Packing nut too tight.
Dry packing.
Fluid tip or needle worn or damaged.
Needle spring deformed or broken.
Too much material flow.
Material too thin.
Gun tilted at an angle.
Gun too far from surface.
Too much air pressure.
Improper thinner being used.
Gun too close to surface.
Air pressure too low.
Improper thinner being used.
Material not properly mixed.
Surface rough, oily, dirty.
Too much, or too fast-drying thinner.
Too much atomization air pressure.
Fan adjustment screw not seating right.
Air cap retaining ring (nut) loose.
4 / 8
CORRECTION
Clean. Ream with non-metallic point.
Clean.
Clean.
Clean. Ream with non-metallic point.
Clean.
Thin or lower fluid flow.
Increase pressure.
Thin to proper consistency.
Back out counterclockwise to achieve proper flow.
Reduce air pressure.
Tighten or replace.
Refill.
Hold more upright.
Clean according to material supplier's
recommendations.
Tighten or replace.
Lubricate or tighten.
Check air supply and air lines.
Open needle adjusting screw.
Reduce pressure.
Adjust to proper distance.
Move at moderate pace, parallel to work surface.
Adjust.
Tighten, do not bind needle.
Replace or lubricate.
Clean.
Adjust.
Lubricate.
Replace tip & needle with lapped sets.
Replace.
Adjust gun or reduce fluid pressure.
Mix properly or apply light coats.
Hold gun at right angle to work and adapt to
proper gun technique.
Check distance. Normally 6-8" (152-203 mm).
Reduce air pressure and check spray pattern.
Follow paint mfg's mixing instructions.
Check distance. Normally 6-8" (152-203 mm).
Increase air pressure or reduce fluid pressure.
Follow paint manufacturer's mixing instructions.
Follow paint manufacturer's mixing instructions.
Properly clean and prepare.
Remix properly.
Reduce pressure.
Clean or replace.
Tighten.
SB-2-167-F (7/2014)
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