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Operation
How the Air-Assisted Spray Gun Operates
The air-assisted spray gun combines airless and air
spraying concepts. The spray tip shapes the fluid into
a fan pattern, as does a conventional airless spray tip.
Air from the air cap further atomizes the fluid and
completes the atomization of the paint tails into the
pattern to produce a more uniform pattern. The width
of the pattern can be slightly adjusted by the pattern
adjustment valve.
Note that the air-assisted spray gun differs from an air
spray gun in that increasing the pattern air reduces the
pattern width. To increase the pattern width, less
pattern air or a larger size tip must be used.
The spray gun has a built-in lead and lag operation.
When triggered, the gun begins emitting air before the
fluid is discharged. When the trigger is released, the
fluid stops before the air flow stops. This helps assure
the spray is atomized and prevents fluid buildup on the
air cap.
Select a Spray Tip and Air Cap
The fluid output and pattern width depend on the size
of the spray tip, the fluid viscosity, and the fluid pres-
sure. Use the Spray Tip Selection Chart, on page 22,
as a guide for selecting an appropriate spray tip for
your application.
Install a Spray Tip
WARNING
INJECTION HAZARD
To reduce the risk of a fluid injection
injury, follow the Pressure Relief Proce-
dure on page 7 before removing or
installing a spray tip.
Install a spray tip in the gun. The air cap and spray tip
position determines the direction of the spray pattern.
Rotate the air cap (the spray tip rotates with it) as
needed for the desired spray pattern direction. See
Fig. 3.
NOTE: If the gun has the AA RAC assembly, hand-
tighten the air cap retaining ring, while holding the
orange tip guard in the desired direction. If the retain-
ing ring is over-tightened, the spray tip will be difficult
to rotate.
Fig. 3
Vertical Spray Pattern Horizontal Spray Pattern
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