Graco ULTRA 500 Instructions-Parts List Manual page 27

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STALL
PRESSURE
CALIBRATION
W A RNlNG
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 risk of a
shock, fire, explosion, or moving parts.
This procedure sets the sprayer to 2750 psi (195 bar)
MAXIMUM WORKING PRESSURE. This procedure by performing this calibretion in any other way.
NEVER attempt to increase the fluid outlet pressure
must be performed whenever a new or used circuit
board, or pressure control assembly is removed and
NEVER EXCEED 2750 psi (196 bar) MAXIMUM
WORKING PRESSURE. Normal operation of the
reinstalled or replaced, to be sura the sprayer is pro-
perly calibrated.
sprayer et higher pressures could result in compo-
nent rupture, fire or explosion.
Improper calibration can cause the sprayer to over- AVOID touching the wires in the pressure control
pressurize and result in component rupture, fire or assembly with your fingers or tools when the control
taining the maximum working pressure which would
explosion.
I t
may also prevent the sprayer from ob-
shock.
box cover ia removed to reduce the risk of electric
result in poor sprayer performance.
Calibration Setup (See Fig 21 and
22)
1. Follow the Pressure Relief Procedure Werning on
page 13. Remove the spray hose end 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.
6.
Use e 3/8" ignition wrench to turn the pressure ed-
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 IW).
clean water.
THE SPRAYER SHOULD NOT STARTI
/f it does start, 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.
8. Slow& turn the pressure control knob clockwise to
the maximum setting and hold it there. Use a 3/8"
ignition wrench to slowly turn the pressure adjust-
ment nut
(S)
clockwise until the test gauge reads
EXACTLY
2750
psi (195 bar).
9. The calibration procedure is now completed.
W A R N I N G
on page 13.
Follow the Pressure Relief Procedure Wsrnlng
CAUTION
To
preventpump corrosion,
flush the water out of
sure to
close
the pressure relief valve, first. Use
the pump, hose and gun with mineral spirits. Be
the lowest pressure necessary to flush. Follow the
Pressure Relief Procedure Warning on page
tect
it
until
you
are ready to spray again.
13. Leave the mineral spirits in the pump to pro-
10.Remove the test gauge assembly and reinstall the
plug. Flush out water with mineral spirits.
Fig
21