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Pressure Control Calibration
(See
Fig 21-1)
WARNING
USE EXTREME CAUTION WHEN PERFORMING THISCALIBRATION PROCEDURE to reduce the risk of afluid
injection injury or other serious bodily injury which
can result from component rupture. electric shock. fire, explosion,
or moving parts.
This procedure sets the sprayer to 2600-3000 psi
NEVER attempt to increase the fluid outlet pressure by
(182-210 bar) MAXIMUM WORKING PRESSURE. performing these calibrations
in any other way.
This procedure must be performed whenever the pres-
WORKING PRESSURE. Normal operation of the
NEVER EXCEED
3000
psi (210 bar) MAXIMUM
sure control assembly is removed and reinstalled or re- sprayer at higher pressures could result in component
placed to be sure the sprayer
is properly calibrated. rupture,
tire or explosion.
I
I
I
' I
AVOID touching the wire in the pressure control as-
sembly when the control box cover
is removed, to re-
duce the risk of electric shock.
S e r v i c e Tools Needed:
NEW
50
ft (15.2
m) 3300
psi (231 bar) flexible,
New
0.023 size spray tip,
C-5ooo psi (&350 bar) fluid-filled pressure gauge,
Part No.
102-814
5 gallon p a i l and water
Mineral spirits
1.
Follow the Pressure Relief Procedure Warning on
page
17.
2.
Install the new
50
ft (15.2 m) spray hose to the
sprayer outlet. On the other end of the hose, install
the gun and a new .023 size tip. Install the fluid-filled
pressure gauge in the top port
(B -
See Fig
19-1)
of
the fluid filter. Remove the pressure control cover.
3. With the gun safety latch engaged, start the engine
adjustment nut (E) clockwise two full turns. See Fig
(onIy).Usinga3/8"ignitionwrench,turnthepressure
21-1. With the pressure control knob (D) turned to
the minimum setting, turn the sprayer switch ON.
nybn ailless spray hose, Part No. 210-541
THE DISPLACEMENT PUMP SHOULD NOT CYCLE
If it does cyde, shut the sprayer switch
OFF, disen-
grounded waste container until pressure is relieved,
gage the gun safety latch, trigger the gun into a
and engage the latch again. Turn the nut (E) a
little
further clockwise. Turn the sprayer on again to be
sure THE
PUMP DOES NOT
CYCLE.
4. Increase the throttle setting and then the pressure
control setting to the maximum while triggering the
gun. Keep the gun triggered while observing the
pressure at which the pump stalls, which should be
approximately
3000
psi (210 bar).
justing nut
(E)
clockwise to reduce pressure and
I f the pressure is not
3000 psi
(270
bar;), turn the ad-
counterclockwise to increase pressure to obtain
..
" "
.
,"^.
.
fore the pressure starts to rise again.
Then note the pressure to which the gauge drops be-
I f the pressure drops to
below 2600
psi
(182
bar),
turn the differential wheel (A)
clockwise to bring the
pressure to 2600 psi (182 bar).
bar),
turn the differential wheel (A) counterclock-
I f
the pressure stops dropping before
2600
psi
(182
wise to decrease the pressure.
5. Follow the Pressure Relief Procedure Warning
on
page
17.
Install the pressure control cover. Flush the
water out with mineral spirits, relieve pressure again,
and then remove all the test equipment.
Fig 21-1
Id
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