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OPERATION
Pressure Relief Procedure
WARNING
To reduce the risk of serious bodily injury, including
fluid injection, splashing fluid or solvent in the eyes
orontheskin,orinjuryfrOmmovingpartsorelectric
shut
off
the sprayer, when checking or servicing
shock, always follow this procedure whenever you
anv Dart
o f
the sway system. when installina.
clganing or changing spray tips, and whenever you
stop spraying.
1.
Engage the gun safety latch.
2.
Turn the ON/OFF switch to OFF
3.
Disengage the gun safety latch. Hold a metal
pan of the gun firmly to the side of a grounded
metal pail, and trigger the gun to relieve pres-
sure.
4.
Engage the gun safety latch.
5. Open the pressure drain valve, having a con-
tainer ready to catch the drainage. Leave the
valve open until you are ready to spray again.
If you suspect that the spray lip or hose is corn-
pletely clogged, or that pressure has not been fuNy
relieved after following the steps above, wrap
a rag
around the tip guard retaining nut or hose end cou-
pling and VERY SLOWLY loosen the part to relieve
pressure gradually, then loosen completely. Now
clear the tip or hose.
1
3. Put the suction tube into the paint container.
4.
Lower the pressure setting
by turning the pressure
adjusting knob a l l the way counterclockwise. See
Fig
73-1.
5. Disengage the gun safety latch. See Fig
73-3
6. To prime the pump, hold a metal part of the gun
firmly against and aimed into a metal waste con-
tainer. See f i g
13-2.
Squeeze the trigger and hold
it
open, turn the ON/OFF switch to ON, and siowly in-
crease the pressure setting until the sprayer starts.
Keep the gun triggered until all air is forced out of the
system and the paint flows freely from the gun.
Re-
lease the trigger and engage the gun safety latch.
NOTE: If the pump is hard to prime, place a container
When fluid comes from the valve, close it. Then
under the pressure drain valve and open
it.
disengage the
g u n
safety latch and proceed as in
Step 6, above.
7. Check all fluid connections for leaks. I f any are
found, follow the Pressure Relief Procedure Warn-
ing, to the left, before tightening connections.
'
8. Install the Spray Tip and Tip
Guard. Be sure the
gun safety latch is engaged.
See
Fig
13-3.
Install the
spray tip. If using the RAC IV tip guard, refer to man-
ual307-848. supplied with the gun, for installation in-
structions.
1
1
9.
Adjust the Spray Pattern
Startup
a. Increase the pressure adjusting knob setting just
until spray from the gun is completely atomized.
Use
this procedure each time you start the sprayer to
To avoid excessive overspray and fogging, and
help ensure the sprayer
is
ready to operate and that you
to decrease tip wear and extend the life of the
start it safely.
sprayer, always use the lowest possible pres-
sure needed to get the desired results.
NOTE: For the first time startup, be sure to flush the
sprayer first. See page 15 for FLUSHING
b. If more coverage is needed, use a larger tip
rather than increasing the pressure.
c. Test the spray pattern. To adjust the direction of
1.
Close the pressure drain valve. If you have not in-
the spray pattern, engage the gun safety latch
stalled a secondary hose, be sure the adapter is se-
and
loosen
the retaining nut. Position the tip
curelyplugged with the plug provided. SeeFig 73-1.
ticaliy for a vertical pattern. Then tighten the re-
guard horizontally for a horizontal pattern or ver-
. .
GUIDELINES.
2. Don't install the spray tip yet!
taining nut.
.
..
.
. .
. . . .
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