Graco A Series Instructions-Parts List Manual page 31

Maximum Working Pressure Adjustment
13. Turn the sprayer OFF . Disengage the gun safety
latch. Trigger the gun into a grounded waste contain-
er until pressure is relieved. Engage the gun safety
latch.
14. Use the 3/8 in. nut driver to turn the pressure adjust-
ment nut (T) counterclockwise one full turn.
15. With the pressure control knob at the minimum set-
ting, turn the sprayer ON.
16. Slowly turn the pressure control knob (B) clockwise
to the maximum setting and hold it there. Use a 3/8
in. nut driver or socket wrench to slowly turn the pres-
sure adjustment nut (T) clockwise until the gauge
reads EXACTLY 3000 psi (210 bar).
INSERT WRENCH HERE
TO ADJUST NUT (T)
Fig 31–1
PRESSURE CONTROL ADJUSTMENT
B
P
Q
74
T
346
17. Turn the pressure control knob to the minimum set-
ting. Release the gun safety latch and trigger the gun
into a grounded waste container until pressure is re-
lieved. Engage the gun safety latch. Slowly increase
the pressure to verify that the maximum working
pressure is set at 3000 psi (210 bar).
CAUTION
To prevent pump corrosion, flush the water out of
the pump, hose and gun with mineral spirits. Be sure
to close the drain valve, first. Use the lowest
pressure necessary to flush. Follow the Pressure
Relief Procedure Warning on page 24. Leave the
mineral spirits in the pump to protect it until you are
ready to spray again.
18. Install the plug (346) in the bottom of the pressure
control. Remove the gauge assembly and reinstall
the plug. Flush out the water with mineral spirits.
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