14 © 2012 Finishing Brands UK Ltd.
Troubleshooting Possible Problems in Operation
Heavy top or
bottom
pattern
Heavy right or
left side pattern
Horn holes plugged.
Obstruction on top or bottom of fluid
nozzle.
Cap and/or nozzle seat dirty.
Left or right side horn holes plugged.
Dirt on left or right side of fluid nozzle.
Clean. Ream with non-metallic point.
Clean.
Clean.
Clean. Ream with non-metallic point.
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 nozzle. 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. Also check for dried paint just inside the cap center hole opening; remove by washing
with solvent.
2. If the defect is not inverted, it is on the fluid nozzle. Clean nozzle. If problem persists, renew nozzle.
Spreader adjustment valve set too
low.
Atomising pressure too low.
Material too thick.
Turn out counter clockwise to
achieve correct pattern.
Increase pressure.
Thin to correct consistency.
Air pressure too high.
Fluid adjusting knob turned in too far.
Spreader adjusting valve set too high.
Reduce at regulator or gun handle.
Turn out counter clockwise to
achieve correct pattern.
Turn in clockwise to achieve correct
pattern.
Jerky or fluttering spray
Loose or damaged fluid nozzle/seat
Loose or broken cup fluid nipple
Material level too low
Container tipped too far
Obstruction in fluid passage
Loose fluid needle packing nut
Damaged fluid needle packing
Tighten or replace
Tighten or replace cup
Refill
Hold more upright
Back flush with solvent
Tighten
Replace
Tighten to 18–20 nm (13-15 ft-lbs).
Fluid leaking or dripping from cup lid
Cup lid loose.
Dirty cup or lid.
Cracked cup or lid.
Push in or replace.
Clean.
Replace cup and lid.
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