30
307–785
PRESSURE
CONTROL ADJUSTMENT
This
procedure sets the sprayer to3000 psi (210 bar)
MAXIMUM WORKING PRESSURE and sets the
overpressurization switch (microswitch) to approxi-
mately
3600 psi (242 bar).
Perform this procedure whenever the pressure con-
trol
assembly is removed and reinstalled or replaced,
or
a new circuit board is installed.
Improper adjustment 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
try to
increase the sprayer
’
s maximum work
-
ing pressure of 3000 psi (210 bar ) by performing
these
adjustments in any other
way
. Normal operation
of
the sprayer at higher pressures may result in com
-
ponent rupture, fire or explosion. To perform this ad-
justment,
however
, the sprayer pressure
must be
tem-
porarily
increased above the normal working pres-
sure.
Use
a
new
50 ft (15.2 m) spray hose rated for at least
3000 psi (210 bar) MAXIMUM WORKING PRES-
SURE. A used, under–rated hose could develop a
high
pressure leak or rupture.
WARNING
USE EXTREME CAUTION WHEN PERFORMING THIS ADJUSTMENT PROCEDURE to reduce the risk of a
fluid injection injury or other serious bodily injury which can result from component rupture, electric shock, fire,
explosion,
or moving parts.
NOTE: The following tools and equipment are required
for
this procedure.
3/8 in. nut driver or 3/8 in. socket wrench
1/4 in. open end wrench
7/16 in. open end wrench
0 – 5000 psi, oil–filled test gauge, Part No. 102–814
Pail of clean water
Mineral spirits
NEW 3000 psi (210 bar) high pressure spray hose,
Part No. 214–915
1.
Follow
the
Pressure Relief Procedure W
arning
on
page
24.
2. Refer
to the above list
of tools and equipment need
-
ed.
Remove the plug (A) from the top
of the fluid filter
and install the fluid-filled pressure gauge. Refer to
Fig
30–1. Connect the gun to the
new
test hose and
connect
the hose to the sprayer outlet.
A
Fig 30-1
3. Remove the pressure control cover
.
4. Place
the pump suction tube in a pail of clean water
.
5. Be
sure the gun safety latch is engaged.
NOTE:
For Steps 5 through 18, refer to Fig 31–1.
6.
Plug in the sprayer
.
7. Turn the pressure control knob (B) to the
minimum
setting
(fully counterclockwise), and turn the
sprayer
ON. THE DISPLACEMENT PUMP SHOULD NOT
CYCLE
If
it does cycle
,
remove the plug (17) from the
bottom
of the pressure control. Insert a 3/8 in. nut
driver through the opening, and unscrew the
pressure
adjustment nut (T) just until the sprayer
stops
running.
Adjust the Overpressurization Switch
8. With the spray gun triggered,
slowly
turn the pres-
sure control knob clockwise just until the sprayer
starts.
Prime the pump and hose.
9. Slowly turn the pressure control knob to the maxi-
mum
setting. While watching the red light
on the cir
-
cuit board and the pressure gauge, turn the nut (T)
slowly
to increase pressure until the red light goes
out and the gauge reads between 3400 –3800 psi
(238
– 266 bar).
If the red light does not go out by 3800 psi
(266
bar),
loosen the nut (P) and adjust the stud
(Q)
until the light goes out.
If
the red light goes out before 3400 psi (238
bar), loosen the nut (P) and adjust the stud (Q)
until
the light goes out between 3400 – 3800 psi
(238
– 266 bar).
10. T
ighten the nut (P) if it was loosened in Step 9.
11. Trigger
the gun to relieve pressure. Release the
trig
-
ger and engage the safety latch. Repeat Step 9 to
verify
your results.
12.
Install the pressure control cover
.
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