Operation - Graco F Series Instructions-Parts List Manual

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:
D are instructed to relieve the pressure,
D stop spraying,
D check or service any of the system equipment,
D or install or clean the spray tip.
1. Lock the gun trigger safety.
2. Close the bleed-type master air valve (required in
your system).
3. Unlock the gun trigger safety.
4. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun to relieve
pressure.

Operation

5. Lock the gun trigger safety.
6. Open the drain valve (required in your system),
having a container ready to catch the drainage.
7. Leave the drain valve open until you are ready to
spray again.
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, very slowly loosen the
tip guard retaining nut or hose end coupling and relieve
pressure gradually, then loosen completely. Now clear
the tip or hose.
Adjusting the Regulator
The back pressure regulator controls pressure ahead
of the regulator intake.
To adjust the regulator, first, back the adjusting knob
out until there is no spring pressure. Then, turn the
knob clockwise to increase pressure.
Adjust the pump air pressure and the back pressure
regulator for the best spraying combination and proper
circulation of fluid.
Record the regulator and air pressure settings for
future reference. The regulator cylinder has exterior
markings (set points 1 to 8) for repeat settings.
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