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Adjust the Spray Pattern
WARNING
RECOIL HAZARD
Due to the very high pressure fluid
emitted, a strong recoil action will occur
when you trigger this gun. If you are
unprepared, your hand could be forced back
toward your body or you could lose your balance
and fall, resulting in serious injury.
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 4000 psi (28 MPa, 280 bar) or
the maximum working pressure of the lowest rated
component in the system.
1. Set the fluid pressure with the fluid regulator. Do
not turn on the air supply yet.
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 10 psi (0.7
bar, 70 kPa). 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 (0.7 MPa, 7 bar) air
pressure to the gun.
Operation
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:
Pattern adjustment is not available with guns
with the AA RAC assembly as the air separa-
tor, part no. 178–414, must be removed when
the RAC assembly is installed.
For some spray tips, when the line air pres-
sure 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 vertical to
horizontal.
Fig. 4
No Air
Fig. 5
Pattern
Adjustment
Knob
Too Little Air
Right Amount
of Air
308–640
0789A
0792
9
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