Pressure Relief Procedure - Graco 390 Repair Manual

Pressure Relief Procedure

WARNING
Follow this Pressure Relief Procedure whenever you
are instructed to relieve pressure, stop spraying, check
or service equipment or install or clean spray tip. Read
Injection Hazard Warning, page 3.
1. Turn OFF power and turn pressure control to lowest
pressure setting.
2. Hold gun against side of grounded metal flushing
pail. Trigger gun to relieve pressure.
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310824C
FLUSH
3. Turn prime valve down.
If you suspect the spray tip or hose is clogged or that
pressure has not been fully relieved after following the
steps above, VERY SLOWLY loosen tip guard retaining
nut or hose end coupling to relieve pressure gradually,
then loosen completely. Clear hose or tip obstruction.
4. Engage trigger safety lock on gun if unit is being
shut down or left unattended.
Pressure Relief Procedure
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