Troubleshooting Possible Problems In Operation - DeVilbiss GFG PRO Technical Bulletin

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Troubleshooting Possible Problems in Operation

CONDITION
Heavy top or
bottom
pattern
Heavy right or
left side pattern
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.
Heavy
centre
pattern
Split spray
pattern
Jerky or fluttering spray
Paint bubbles in cup
Fluid leaking or dripping from cup lid
CAUSE
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.
Spreader adjustment valve set too
low.
Atomising pressure too low.
Material too thick.
Air pressure too high.
Fluid adjusting knob turned in too far.
Spreader adjusting valve set too high.
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
Fluid nozzle not tight.
Cup lid loose.
Dirty cup or lid.
Cracked cup or lid.
14
CORRECTION
Clean. Ream with non-metallic point.
Clean.
Clean.
Clean. Ream with non-metallic point.
Clean.
Turn out counter clockwise to
achieve correct pattern.
Increase pressure.
Thin to correct consistency.
Reduce at regulator or gun handle.
Turn out counter clockwise to
achieve correct pattern.
Turn in clockwise to achieve correct
pattern.
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).
Push in or replace.
Clean.
Replace cup and lid.
© 2012 Finishing Brands UK Ltd.

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