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SB-2-362
Page 5
TROUBLESHOOTING
CONDITION
CAUSE
CORRECTION
Heavy top or
'
6
Horn holes plugged.
Clean. Ream with non-metallic point.
bottom pattern
Obstruction on top or bottom of fluid tip.
Clean.
Cap and/or tip seat dirty.
Clean.
Heavy right or left
Left or right side horn holes plugged.
Clean. Ream with non-metallic point.
side pattern
Dirt
on
left or right side of fluid tip.
Clean.
)(
Remedies for the top-heavy, bottom-heavy, right-heavy, and left-heavy patterns:
1' Determine if the obstruction is on the air cap or the fluid tip. Do this by making a test spray
pattern. Then, rotate the cap one-half turn and spray another pattern. If the defect is
inverted, obstruction is on the air cap. Clean the air cap as previously instructed.
2, If the defect is not inverted,
it is on the fluid tip. Check for a fine burr on the edge of the
fluid tip. Remove with #600 wet or dry sand paper.
3. Check for dried paint just inside the opening; remove by washing with solvent.
Heavy center pattern
Fluid flow too high for atomization air.
Balance air pressure and fluid flow. Increase
t
spray pattern width with spreader adjustment
valve.
Material flow exceeds air cap's capacity.
Thin or lower fluid flow.
Spreader adjustment valve set too low.
Adjust.
Atomizing pressure too low.
Increase pressure.
Materia! too thick.
Thin to proper consistency.
Split spray pattern
I
Atomization air pressure too high.
Reduce at transformer or gun.
Fluid flow too low.
Increase fluid flow (increases gun handling
Spreader adjusting valve set too high.
speed).
Adjust.
Jerky or
flutterini~~ ~
u
~~
*Loose or damaged fluid tip/seat.
Tighten or replace.
Baffle seal installed incorrectly.
Install per directions.
Material level too low.
RefilL
Container tipped too far.
Hold more upright.
Obstruction in fluid passage.
Backftush with solvent.
Dry or loose fluid needle packing nut.
Lubricate or tighten.
Unable to get round spray
Spreader adjustment screw not seating
Clean or replace.
properly.
Air cap retaining ring loose.
Tighten.
Will not spray
No air pressure at gun.
Check air supply and air Jines, blow out gun air
passages.
Fluid needle adjusting screw not open
Open fluid needle adjusting screw.
enough.
Fluid too heavy for grav'1tyfeed.
Thin material and/or change to larger tip size.
Paint bubbles in cup
Fluid tip not tight.
Tighten tip to
12-15 ft-lbs.
Fluid leaking or dripping from
Cup lid loose.
Push in or tighten lid.
cup lid
Dirty threads on cup or lid.
Clean.
Cracked cup or lid.
Replace cup and lid.
Starved spray pattern
Inadequate material flow.
Back fluid adjusting screw out to first thread,
or change to larger tip size.
Low atomization air pressure.
Increase air pressure and rebalance gun.
Excessive overspray
Too much atomization air pressure.
Reduce pressure.
Gun too far from work surface.
Adjust to proper distance.
Improper stroking (arcing, gun motion too
Move at moderate pace, parallel to work
fast).
surface.
Excessive fog
Too much or too fast-drying thinner.
Remix properly.
Too much atomization air pressure.
Reduce pressure.
Dry spray
Air pressure too high.
Reduce air pressure.
Gun tip too far from work surface.
Adjust to proper distance.
Gun motion too fast.
Slowdown.
Gun out of adjustment.
Adiust
Fluid leaking from packing nut
Packing nut ioose.
Tighten, do not bind needle.
Packing worn or dry.
Replace or lubricate.
Fluid leaking or dripping from
Packing nut too tight.
Adjust.
front of gun
Dry packing.
Lubricate.
Fluid tip or needle worn or damaged.
Replace tip and needle.
Foreign matter in tip.
Clean.
Fluid needle spring broken.
Replace.
Wrong size needle or tip.
Replace.
>)!·Most common problem.
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