Stall Pressure Calibration; Working Pressure - Graco A Series Instructions-Parts List Manual

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STALL
PRESSURE CALIBRATION
WARNING
fluid injection injury or other
serious
bodily injury which can result from splashing, component rupture, electric
USE EXTREME CAUTION WHEN PERFORMING THIS CALIBRATION PROCEDURE to reduce the riskof a
shock, fire, explosion, or moving parts.
This procedure sets the sprayer to 2750 psi (195 barl
MAXIMUM WORKING PRESSURE. This procedure
must be performed whenever a new or used circuit
board, or pressure control assembly is removed and
reinstalled or replaced, to be sure the sprayer is pro-.
perly calibrated.
Improper calibration can cause the sprayer to over-
pressurize and result in component rupture, flre or
taining the maximum working pressure which would
explosion. It may also prevent the sprayer from ob-
result in poor sprayer performance.
Callbration Setup (See Fig 21 and
2 2 1
1. Follow the Pressure Relief Procedure Warning on
page 13. Remove the spray hose and gun. Install a
0,015' spray tip in the gun. Connect the gun to the
new test hose and connect the hose to the sprayer
outlet.
2. Remove the pressure control screws and cover.
3. Remove the plug from the top of the fluid filter, and
4. Place the pump suction tube in a 5 gallon pail
of
5. Be sure the gun safety latch is engaged.
8.
Use
s
318" ignition wrench to turn the pressure ad-
justment nut
(SI
counterclockwise about
two
full
turns. See Fig
22.
7. With the pressure control knob a t the
minimum
set-
ting. turn the sprayer switch ON.
install the test gauge (Wl.
clean water.
THESPRAYERSHOULDNOTSTARTI
lf it does st8rf,
shut the sprayer switch OFF,
disengage the gun safety latch, trigger the gun into a.
grounded waste container until pressure is relieved.
justment nut
(SI
a little further counterclockwise.
Engage the gun safety latch. Turn the pressure ad-
Turn the sprayer on to be sure
it
does not Start.
the maximum setting and hold it there. Use
a
318"
8. Slowly turn the pressure control knob clockwise to
ignition wrench to slowly turn the pressure adjust-
ment nut
(SI
clockwise until the test gauge reads
EXACTLY 2750 psi (196 barl.
9. The calibration procedure is now completed.
Follow the Pressure Re1 e rocedura Warning
on page 13.
WARNlYB
CAUTION
the pump, hose and gun with minerel spirits. Be
To preventpump corrosion, flush the water out of
sure to close the drain valve,
fi r st.
Use the lowest
pressure necessary to flush. Follow the Pressure
the mineral spirits in the pump to protect
it
until
Relief Procedure Warning on page 13. Leave
you are aready to spray again.
NEVER attempt to increase the fluid outlet pressure
by performing
this calibration in any other way.
WORKING PRESSURE.
Normal operation of the
NEVER EXCEED 2750 psi (196 berl MAXIMUM
sprayer at higher pressures could result in compo-
nent rupture, fire or explosion.
AVOID touching the wires in the pressure control
assembly with your fingers or tools when the control
box cover is removed to reduce the risk of electric
shock.
10.Remove the
test
gauge assembly and reinstall the
plug. Flush out water with mineral spirits.
Fig
21