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STALL
PRESSURE
CALIBRATION
I
WA
RNlNG
I
USE EXTREME CAUTION
WHEN PERFORMING
THIS CALIBRATION PROCEDURE
to
reduce the risk of a
fluid 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 192 bar (2750 psi)
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.
pressurize
and result
in
component
rupture, fire or
Improper
calibration can
cause the sprayer to
over-
explosion.
It
may also prevent the sprayer from ob
-
taining the maximum working pressure which would
result in poor sprayer performance.
Calibration Setup
(See
Fig
23
and 24)
1. Follow the Pressure Relief Procedure Warning
a
0.015' spray tip in the gun. Connect the gun
to
a
on page 17. Remove the spray hose and gun. Install
outlet.
new
test hose and connect the hose to the sprayer
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
install the test gauge
(W).
clean water.
5.
Be sure the gun safety latch is engaged.
6. Use a 9 mm
(3/8') ignition wrench to turn the
pressure adjustment nut
(SI
counterclockwise
about
two
full turns. See Fig 24.
7. With the pressure control knob
(B) at
the
minimum
setting, turn the sprayer switch ON.
THE SPRAYER SHOULD NOT
STARTI
If
it
does start,
shut the. sprayer switch OFF,
disengage the
gun
safety latch, trigger
the
gun
into
a grounded waste container until pressure is reliev
-
ed. Engage the gun safety latch. Turn the pressure
adjustment
nut
(S)
a
little further counterclockwise.
Turn the sprayer on to be sure
it
does nor
start.
8.
Slowly
turn the pressure control knob
(81
clockwise
to the maximum setting and hold
it
there. Use a
9
mm
(3/8') ignition wrench to slowly turn the
pressure adjustment
nut
(S)
clockwise
until
the
test
gauge reads EXACTLY 192 bar
(2750
psi).
h
WARNING
1
I
Follow the Pressure Relief Procedure Warning
on page
17.
1
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
the mineral spirits
in
the pump to protect
it
until
Relief Procedure Warning
on
page
17.
Leave
you are ready to spray again.
9.
Remove the'test gauge assembly and reinstall the
plug. Flush out water
with
mineral spirits.
24
307
-
671
NEVER attempt to increase the fluid outlet pressure
by performing this calibration in any other way.
NEVER EXCEED 192 bar (2750 psi) 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.
Fig
23
Fig
24