Pressure
Control Adjustment
WARNING
Use
extreme caution when performing this calibra
-
tion procedure
to reduce
the risk of a fluid injection in
-
jury 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
(182–210
bar) Maximum W
orking Pressure.
Perform
this procedure whenever the pressure control
assembly
is removed and reinstalled, or replaced, to be
sure
the sprayer is properly calibrated.
Improper calibration can cause the sprayer to over–
pressurize
and result in component rupture, fire or
ex
-
plosion.
It may also prevent the sprayer from
obtaining
the maximum working pressure, resulting in poor
sprayer
performance.
NEVER
attempt
to increase the fluid outlet pressure by
performing these calibrations in any other way. Never
Exceed 3000 Psi (210 Bar) Maximum W orking Pres-
sure. Normal operation of the sprayer at higher pres-
sures could result in component rupture, fire or explo-
sion.
ALWAYS
use a
new
50 foot (15.2 m) spray hose, rated
for
at least 3000 psi (210 bar)
Maximum W
orking Pres
-
sure,
when performing this procedure. A used,
under–
rated hose could develop a high pressure leak or rup-
ture.
Service Tools Needed:
New
50 foot (15.2 m), 3000 psi (210 bar),
flexible nylon airless spray hose, Part No. 223–541
0–5000 psi (0–350 bar) fluid–filled pressure gauge,
Part No. 102–814
New
spray tip, size 0.025 to 0.029
3/8 in. ignition wrench or nut driver
5 gallon pail of water or mineral spirits
Swivel, 156–823
Nipple, 162–453
T
ee, 104–984
Set Up
1. Follow
the
Pressure Relief Procedure W
arning
on
page
4.
2.
Set up the system as shown in Fig. 30.
Set the Dead Band (Pressure Differential)
1. Remove
the pressure control cover
.
NOTE:
Do not alter this adjustment if the wheel is already
set
as shown in Fig. 31.
2. Set the white dif ferential wheel (A) on the micro-
switch. Turn the wheel so the letter F is concealed
behind the switch and the letter E is the first letter
seen.
Pressure Up
1. Start
the sprayer and prime it.
2.
Adjust the pressure to 2600 psi (180 bar).
3. Shut
of
f the engine. If the
pressure drops after the en
-
gine is shut of f, replace the pump packings before
proceeding.
See page 26.
Adjust the Pressure
See
Fig. 32.
1. Remove
the plug (320) in the bottom of the pressure
control.
2. Turn and hold the pressure control knob (B) at the
maximum
pressure.
3. Engage
the nut
(C): Insert the nut driver through the
pressure
control hole (D), or use an ignition wrench
inserted from the front of the pressure control.
Fig. 30
162–453
104–984
102–814
156–823
223–541
0035
Fig. 31
Inside
pressure
control looking up
at dif
ferential wheel
A
0036
Fig.
32
B
C
320
D
0037
a.
Loosen the nut just until you hear a click. Stop.
b. Slowly tighten the nut just until another click is
heard.
Stop.
4. Replace the plug (320) and the pressure control
cover.
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