Adjust The Spray Pattern; Flush The Spray Gun - Graco A Series Instructions-Parts List Manual

Adjust the Spray Pattern

This gun can atomize many fluids with different viscosi-
ties and at various flow rates. Follow these steps to es-
tablish the correct fluid flow and air flow:
1. Set the atomizing air pressure at 30 psi (2 bar) and
fluid pressure at 3 to 4 psi (0.25 bar).
2. Choose the correct fluid nozzle and air cap combina-
tion for your application. See Instruction Manual
307–803 for the air cap consumption and fluid nozzle
flow rate information. Both flow rate and viscosity
must be considered. A 0.047 in. (1.2 mm) fluid noz-
zle is furnished with the gun.
3. Adjust the fluid flow by using the fluid pressure regu-
lator installed in the fluid line. (See the Accessories
section.)
4. For fine adjustment, use the fluid adjusting screw
(54) located at the rear of the gun. See Fig 3. Turn it
clockwise to reduce the amount of fluid being
sprayed, and counterclockwise to increase the
amount being sprayed.
5. Use an air pressure regulator to adjust the pressure
for the desired degree of atomization. Always use the
lowest air pressure possible for the most efficiency.
See the Spray Pattern Troubleshooting Chart in
the Service Section.
6. Use the air adjusting screw (41) to change the shape
of the spray pattern. Turn it counterclockwise for a
wide pattern and clockwise for a solid, round pattern.
KEY
41 Air Adjusting Screw Assembly
54 Fluid Adjusting Screw Assembly
41
54
Fig 3
OPERATION
NOTE: When increasing to a wide, flat pattern, you may
have to increase the supply of fluid to the gun to
maintain the same amount of coverage over a
large area.
When all adjustments of atomizing air, fluid pressure, and
fan pattern are made, the Power Supply can be turned on
and operation can begin. (The spray pattern may need to
be adjusted slightly after the Power Supply is turned on.)

Flush the Spray Gun

To reduce the risk of fire or explosion and serious
bodily injury, the Power Supply MUST be turned
OFF before flushing.
1. Turn off the Power Supply (K). Follow the Pressure
Relief Procedure Warning on page 9.
3. Disconnect and plug the fluid line.
4. Connect the solvent supply to the gun.
5. Run solvent through the gun.
6. Disconnect the solvent supply.
7. Reconnect the fluid supply line.
8. Turn on the fluid and air supplies.
9. Trigger the gun until it is clean of solvent.
WARNING