EN
77-1153-R25.1 (8/2014)
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FAULTY PATTERNS AND HOW TO CORRECT THEM
PATTERN
CAUSE
CORRECTION
Dried material around the
outside of the fluid nozzle tip
at position “C” restricts the
passage of atomizing air at
one point through the center
opening of air nozzle and
results in pattern shown.
This pattern can also be caused
by a loose air nozzle.
Dried material in side-port
“A” restricts passage of air.
Greater flow of air from
cleaner side-port “B” forces
fan pattern in direction of
clogged side.
Dissolve material in side-ports with thinner,
then blow gun clean. Do not poke into
openings with metal instruments.
Remove air nozzle and wipe off fluid tip
using rag wet with thinner. Tighten air
nozzle.
A split spray or one that is heavy on each
end of a fan pattern and weak in the
middle is usually caused by:
(1) Too high an atomization air pressure
(2) Attempting to get too wide a spray
pattern with thin material.
Reducing air pressure will correct cause (1).
To correct cause (2), open material control
to full position by turning to left. At the
same time, turn spray width adjustment to
right. This will reduce width of spray, but
will correct split spray pattern.
(1) Dried out packing around material
needle valve permits air to get into
fluid passageway. This results in
spitting.
(2) Dirt between fluid nozzle seat and
body or loosely installed fluid nozzle
will make gun spit.
(3) A loose or defective swivel nut on
siphon cup or material hose can cause
spitting.
To correct cause (1) back
up knurled nut (E), place
two drops of gun lube on
packing, replace nut and
tighten with fingers only.
In aggravated cases,
replace packing.
To correct cause (2), remove fluid nozzle (F),
clean back of nozzle and nozzle seat in gun
body using rag wet with thinner, replace
nozzle and draw up tightly against body.
To correct cause (3), tighten or replace
swivel nut.
E
F
G
