6
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.
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 assembly.
Remove air nozzle assembly (1) and
wipe off fluid nozzle tip (2) using rag
wet with thinner. Tighten air nozzle
assembly.
A split spray or a spray 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
fluid control knob (20) to full position
by turning counterclockwise.
At the same time, turn fan control
knob (12) clockwise. This will reduce
width of spray, but will correct split
spray pattern.
Intermittent spray is caused by:
(1)
Air leaking into the fluid passages
due to either of the following
reasons:
• The seal cartridge assembly (25) may
be loose.
• The fluid nozzle (2) may be loose.
(2)
Insufficient fluid supply.
(3)
Clogged fluid passage due to dirty
fluid.
(1)
Check these locations and tighten if
necessary.
(2)
Fill the fluid supply
(3)
Clean fluid passages with solvent
and strain fluid.
FAULTY PATTERNS AND HOW TO CORRECT THEM
PATTERN
CAUSE
CORRECTION
Spitting is caused by anything that
restricts the movement of the fluid
needle assembly (19). The probable
causes include:
(1)
The fluid needle is bent.
(2)
Dried material has built up on the
needle or in the fluid nozzle (2).
(1)
Lumps or impurities in the fluid.
(4)
A loose or defective swivel nut on the
siphon cup or material hose can cause
spitting.
(1)
You may be able to straighten the
needle.
(2)
Clean with thinner as above.
(3)
Strain all material before use.
Consider an Oil and Water
Extractor/Regulator (HFRL-508) to
keep fluid free of impurities in the
air supply.
(2)
For fluid pressure setups, tighten or
replace swivel nut.
A
B
C
Regulator pressures are based on 25' of 5/16" hose in good condition and without quick disconnects or other
restrictive fittings. Gun inlet pressures are measured at the gun air inlet with the gun triggered.
These recommendations are for typical or average fluids, and are intended to serve as a starting point. Adjust as
necessary for your specific application.
CAUTION
Never use anything metal to clean the air
nozzle or fluid nozzle. These parts are pre-
cisely machined, and any damage to them
will cause faulty spray patterns.
!
