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Operation
Safety
WARNING
INJECTION HAZARD
Remember, this is not an air spray gun.
For your safety be sure to read and
follow the Warnings on pages 2 and 3
and throughout the text of this instruction manual.
Keep the wallet sized warning card 179960, pro-
vided with the gun, with the operator of this equip-
ment at all times. The card contains important
treatment information should an injection injury
occur. Additional cards are available at no charge
from Graco.
Pressure Relief Procedure
WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the
Pressure Relief Procedure
whenever you:
are instructed to relieve the pressure,
stop spraying,
check or service any of the system equipment,
or install or clean the spray tip.
1.
Shut off power to the pump by closing the bleed-
type master air valve (required in the system).
2.
Unlock the gun trigger safety. See Fig. 4.
3.
Hold a metal part of the gun firmly to the side of a
grounded metal waste container and trigger the
gun to relieve the fluid pressure.
4.
Lock the gun trigger safety. See Fig. 4.
5.
If you suspect that the spray tip is completely
clogged or that pressure has not been fully re-
lieved after following the steps above
,
very slowly
loosen the air cap retaining ring to relieve pressure
in the cavity between the ball/seat shutoff and the
plugged tip. Clear the tip orifice.
6.
If you suspect that the fluid hose is completely
clogged or that pressure has not been fully re-
lieved after following the steps above
,
very slowly
loosen the hose end coupling at the gun and
relieve pressure gradually. Then loosen completely
to clear the obstruction.
Fig. 4
Gun Trigger Safety
Unlocked
Gun Trigger Safety Locked
TI0394
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.
