Technical data
Stall Pressure Calibration
WARNING
USE EXTREME CAUTION WHEN PERFORMING THIS CALIBRATION PROCEDURE to reduce the risk of
an injection injury or other serious bodily injury which can result from splashing, component rupture, electric
shock, fire, explosion, or moving parts.
This procedure sets the sprayer to 3000 psi (210 bar)
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, fire or
explosion. It may also prevent the sprayer from ob-
taining the maximum working pressure which would
result in poor sprayer performance.
NEVER attempt to increase the fluid outlet pressure
by performing this calibration in any other way.
NEVER EXCEED 3000 psi (210 bar) MAXIMUM
WORKING PRESSURE. Normal operation of the
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.
Calibration Setup (See Fig 18 and 19)
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 elbow (88). Holding the nipple (341)
with a wrench to prevent it from turning, rotate the
tee (85) up and install the test gauge 1x1 in the tee
(851. See Fig 18.
4. Place the pump suction tube in a 5 gallon pail of
clean water.
5. Be sure the gun safety latch is engaged.
6. Use a 3/8” ignition wrench to turn the pressure ad-
justment nut (S) counterclockwise about two full
turns. See Fig 19.
7. With the pressure control knob at the
minimum
set-
ting, turn the sprayer switch ON. See Fig 18.
THE SPRAYER SHOULD NOT STARTI
If it does start,
shut the sprayer switch OFF,
disengage the gun safety latch, trigger the gun into a
waste container until pressure is relieved. Engage the
gun safety latch. Turn the pressure adjustment nut
IS) a little further counterclockwise. Turn the sprayer
on to be sure it
does not
start.
8. Slowly 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 (SI clockwise until the test gauge reads
EXACTLY 3000 psi (210 bar).
9. The calibration procedure is now completed.
WARNING
I
Follow the Pressure Relief Procedure Warning
on page 13.
A
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 13. Leave
the mineral spirits in the pump to protect it until
you are ready to spray again.
lO.Remove the test gauge assembly. Flush out water
with mineral spirits.
Fig 18
Fig 19
820-047 27