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Troubleshootin
g
Gun Operation
Troubleshooting
Problem
Cause Solution
Atomizing air
pressure too high.
Close atomizing air 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.
Increase vi
scosity or increase fluid
flow rate.
Atomizing air pressure too low.
Open atomizing air valve more or
increase gun air inlet pressure;
use lowest air pressure necessary.
Spray tip is too large. Use smaller tip. See Spray Tip
Selection Chart, page 62.
Poorly m
ixed or filtered fluid.
Remix or
refilter fluid.
“Orange Peel” finish.
Fluid too thick. Reduce viscosity.
Fluid l
eaks from the fluid packing
area.
Worn flu
id needle packings or rod.
See Flu
id Needle Replacement,
page 44.
Air leaks from the front of the gun.
Air valve is not seating properly.
See Air Valve Repair, page 51.
Worn or damaged fluid needle ball. See Fluid Needle Replacement,
page 44.
Worn
fluid seat housing.
See A
ir Cap, Spray Tip, and Fluid
Sea
t Housing Replacement, page
40.
Loose spray tip. Tighten retaining ring.
Fluid leakage from the front of the
gun.
Damaged tip seal.
Se
e Air Cap, Spray Tip, and Fluid
Se
at Housing Replacement, page
40.
Low fluid supply. Add fluid if necessary.
D
amaged spray tip.
R
eplace.
Dirty or clogged spray tip.
Clean. See
Clean the Gun Daily, page 29.
Gun does not spray.
Damaged fluid needle. See Fluid Needle Replacement,
page 44.
Dirty air cap. Damaged or plugged air cap.
Clean air cap. 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).
36 3A2495C