Page 6 SB-2-192-F
TROUBLESHOOTING
CONDITION
CAUSE
CORRECTION
Heavy top or bottom
Horn holes plugged.
Clean. Ream with non-metallic point.
pattern
Obstruction on top or bottom of fluid tip.
Clean.
Cap and/or tip seat dirty.
Clean.
Heavy right or left side pattern
Left or right side horn holes plugged.
Clean. Ream with non-metallic point.
Dirt on left or right side of fluid tip.
Clean.
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. Cleanair 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 washing with solvent.
Heavy center pattern
Material flow exceeds air cap’s capacity.
Thin or lower fluid flow.
Fluid pressure too high for atomization
Balance air and fluid pressure.
air (pressure feed).
Increase spray pattern width with spreader
adjustment valve.
Atomizing pressure too low.
Increase pressure.
Spreader adjustment valve set too low.
Adjust.
Material too thick.
Thin to proper consistency.
Split spray pattern
Atomization air pressure too high.
Reduce at transformer or gun.
Fluid pressure too low (pressure feed only).
Increase fluid pressure (increases gun
handling speed).
Spreader adjusting valve set too high.
Adjust.
Jerky or fluttering spray
*Loose or damaged fluid tip/seat.
Tighten or replace.
Material level too low.
Refill.
Container tipped too far.
Hold more upright.
Dry or loose fluid needle packing nut.
Lubricate or tighten.
Obstruction in fluid passage.
Backflush with solvent.
Loose or broken fluid tube or fluid inlet nipple.
Tighten or replace.
Will not spray
No air pressure at gun.
Check air supply and air lines.
Fluid needle adjusting screw not open enough.
Open fluid needle adjusting screw.
Fluid pressure too low at pressure tank.
Increase fluid pressure.
Fluid too heavy for suction feed.
Thin material or change to pressure feed.
Excessive overspray
Too much atomization air pressure.
Reduce pressure.
Gun too far from work surface.
Adjust to proper distance.
Improper stroking (arching, gun motion too fast)
Move at moderate pace, parallel to work
surface.
Fluid leaking from packing nut
Packing nut loose.
Tighten, but do not bind needle.
Packing worn or dry.
Replace or lubricate.
Fluid leaking or dripping from
*Foreign matter in tip.
Clean.
front of pressure feed gun
Packing nut too tight.
Adjust.
Dry packing.
Lubricate.
Fluid tip or needle worn or damaged.
Replace tip & needle with lapped set.
Fluid needle spring deformed or broken.
Replace.
Wrong size needle or tip.
Replace.
*Most common cause.
