Hitachi AA 2000 - Manual (Page 9)

307-586 9
Operation
Adjust the Spray Pattern
WARNING
INJECTION HAZARD
To reduce the risk of component rupture
and serious injury, including injection, do
not exceed the gun’s maximum fluid
working pressure of 950 psi (66 bar) or the maxi-
mum working pressure of the lowest rated compo-
nent in the system.
NOTE: Optional gun parts are available for special
applications. See page 20.
1. Set the fluid pressure at 300 psi (21 bar) with the
fluid regulator.
2. Trigger the gun to check the atomization; do not be
concerned about the pattern shape yet.
3. Increase the fluid pressure just to the point where
a further increase in fluid pressure does not signifi-
cantly improve fluid atomization.
4. Close the pattern adjustment valve by turning the
knob (see Fig. 4) counterclockwise all the way.
This sets the gun for its widest pattern.
5. Set the atomizing air pressure at about 20 psi (1.4
bar). Check the spray pattern, then adjust the air
pressure until the tails are completely atomized
and pulled into the spray pattern. See Fig. 5. Do
not exceed 100 psi (7 bar) air pressure to the gun.
For a narrower pattern, turn the pattern adjustment
valve knob clockwise. If the pattern is still not
narrow enough, increase the air pressure to the
gun slightly or use a different size tip.
NOTE: For some spray tips, when the line air pressure
to the gun is increased to a certain level, the spray
pattern will become round. This is the smallest pattern
width. Further increases in air pressure will force the
pattern to turn from horizontal to vertical or from verti-
cal to horizontal.
Apply the Fluid
When applying the fluid, keep the gun a consistent
distance, 8 to 10 inches (200 to 250 mm), from the
surface of the object being sprayed. Always hold the
gun at a right angle from the surface. Do not make an
arc with the gun as it causes an uneven coat of fluid.
See Fig. 6.
Fig. 4
Pattern
Adjustment
Knob
No Air Too Little Air Right Amount
of Air
Fig. 5
0792
RIGHT
Fig. 6
0793A
WRONG