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Gun
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Operation
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Troubleshooting
ProblemProblem
Problem
CauseCause
Cause
SolutionSolution
Solution
Atomizing air pressure too high.
Close restrictor valve part way, or
decrease air pressure as low as
possible; minimum 45 psi (0.32
MPa, 3.2 bar) needed at gun for
full voltage.
Excessive spray fog.
Fluid too thin, or uid ow is too
low.
Increase viscosity or increase uid
ow rate.
Atomizing air pressure too low.
Open atomizing air valve more or
increase gun air inlet pressure;
use lowest air pressure necessary.
Poorly mixed or ltered uid. Remix or relter uid.
“Orange Peel” nish.
Fluid too thick. Reduce viscosity.
Fluid leaks from the uid packing
area.
Worn packings or rod.
See Packing Rod Repair, page 40.
Air leaks from the front of the gun.
Air valve is not seating properly.
See Air Valve Repair, page 50.
Worn or damaged uid packing
rod or electrode.
Replace packing rod (2e)
or electrode (3). See
Packing Rod Repair, page 40 or
Electrode Replacement, page 39.
Worn uid nozzle seat. Replace nozzle (4). See
Air Cap and Nozzle Replacement,
page 38.
Loose uid nozzle.
Tighten.
Fluid leakage from the front of the
gun.
Damaged nozzle o-ring.
See Air Cap and Nozzle
Replacement, page 38.
Low uid supply. Add uid if necessary.
Dirty or clogged uid nozzle. Clean. See
Clean the Gun Daily, page 29.
Gun does not spray.
Closed or damaged uid
adjustment valve.
Open valve, or see
ES On-Off and Fluid Adjustment
Valve Repair, page 49.
Dirty air cap.
Misaligned air cap and uid nozzle. Clean uid buildup off air cap
and uid nozzle seat. See
Clean the Gun Daily, page 29.
Poor grounding.
See Grounding, page 21.
Excessive paint wrap back to
operator.
Incorrect distance from gun to part. Should be 8–12 in. (200–300 mm).
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