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Troubleshooting
Problem
Spitting
Other spray pattern
problems.
Unable to get round
pattern.
Will not spray.
312388P
Cause
One side of air cap (1) dirty or
clogged.
a. Loose air cap (1).
b. Dried or damaged air
cap (1) or fluid nozzle (2).
a. Atomization air pressure
set too high.
b. Spraying a thin material in
too wide of a pattern.
Air getting into paint stream.
a. Cup almost empty.
b. Dry needle packing (3-1,
3-2).
c. Fluid nozzle (2) too loose.
d. Dried material between
nozzle (2) and gun body.
e. Damaged needle seal.
a. Gun not properly adjusted. a. See page 5.
b. Sluggish needle (10).
Pattern adjustment knob (5)
not seating properly.
a. No air pressure at gun.
b. Cup empty.
c. Fluid adjustment knob (8-2)
turned too far clockwise.
d. Fluid too thick for gravity
feed.
Solution
Clean air cap orifices. See page 6. Blow
air through orifices until clean. If air cap
holes are damaged, replace air cap.
a. Tighten.
b. Rotate air cap 180°.
If pattern follows air cap, problem is
in air cap. Clean and inspect. See
page 6. If pattern is not corrected,
replace air cap.
If pattern does not follow the air cap,
the problem is with the fluid nozzle.
Clean and inspect the nozzle. See
page 6. If the pattern is not corrected,
replace nozzle.
a. Reduce air pressure.
b. Increase material control by turning
fluid adjustment knob (8-2) counter-
clockwise while reducing spray width
by turning pattern adjustment
knob (5) clockwise.
Or increase material viscosity.
a. Fill cup.
b. Loosen packing seat and put a few
drops of machine oil on packing (3-1,
3-2). Retighten seat (4).
c. Tighten.
d. Clean nozzle and front of gun. See
page 6.
e. Replace seal. See page 8.
b. Clean and lubricate.
Clean or replace knob.
a. Check air supply and air lines.
b. Fill cup.
c. Adjust knob (8-2) counterclockwise.
d. Thin material.
Troubleshooting
7
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