11
307–785
OPERATION
WARNING
Pressure
Relief Procedure
T
o reduce the risk of serious bodily injury
, including
fluid injection, splashing fluid or solvent in the eyes
or
on the skin, or injury from moving parts or
electric
shock, always follow this procedure whenever you
shut
of
f the sprayer
, when checking or servicing any
part
of the spray system, when installing, cleaning
or
changing
spray tips, and whenever you stop spray
-
ing.
1. Engage
the gun safety latch.
2.
T
urn the ON/OFF switch to OFF
.
3.
Unplug the sprayer
.
4.
Disengage the gun safety latch. Hold a metal
part of the gun firmly to the side of a grounded
metal pail, and trigger the gun to relieve
pressure.
5.
Engage the gun safety latch.
6. 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 tip or hose is completely
clogged,
or that pressure has not been fully
relieved
after following the steps above,
wrap a rag around
the
tip guard retaining nut or hose end coupling and
VERY
SLOWL
Y loosen the part to relieve pressure
gradually,
then loosen completely
. Now clear the tip
or
hose.
Startup
Use this procedure each time you start the sprayer to
help
ensure the sprayer
is ready to operate and that you
start
it safely
.
NOTE: For the first time startup, be sure to flush the
sprayer first. Refer to page 14 for FLUSHING
GUIDELINES.
1. Close
the pressure drain valve.
If you did not install
a secondary hose, be sure the nipple is tightly
plugged
with the cap provided.
Refer to Fig 12–1.
2. Don’t install the spray tip until the pump is
primed!
3. Put the suction tube into the paint container.
4. Lower
the pressure
setting
by turning the pressure
adjusting knob all the way counterclockwise.
Refer
to
Fig 12–1.
5. Disengage
the gun safety latch.
Refer to Fig 12–2.
6. To prime the pump , hold a metal part of the gun
firmly against and aimed into a metal waste con-
tainer.
Refer to Fig 1 1–1.
Squeeze the trigger and
hold it open, turn the ON/OFF switch to ON, and
slowly
increase 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.
Release
the trigger and engage the gun safety
latch.
MAINTAIN
FIRM
MET
AL T
O MET
AL
CONT
ACT WHEN
FLUSHING
Fig 11-1
CAUTION
If
the pump runs without fluid in it for more than
30
seconds, the displacement pump packings will
be
damaged.
If the pump does not prime easily
, follow
the
NOTE
below
.
NOTE: If the pump is hard to prime, place a container
under the pressure drain valve and open it.
When
fluid comes from the valve, close it. Then
disengage the gun safety latch and proceed as
in
Step 6, above.
7. Check all fluid connections for leaks . If any are
found,
follow the
Pressure Relief Procedure W
arn-
ing,
to the left, before tightening connections.
8.
Install the Spray Tip and Tip Guard. Be sure the
gun safety latch is engaged.
Refer to Fig 12–2.
In-
stall the spray tip. If you are using the RAC IV tip
guard, refer to manual 307–848, supplied with the
gun,
for installation instructions.
9.
Adjust the Spray Pattern
a. Increase
the pressure adjusting knob setting just
until
spray from the gun is completely atomized.
Always
use the lowest possible pressure needed
to
get the desired results. This avoids excessive
overspray
and fogging, and to decrease tip wear
and
extend the life of the sprayer
.
b.
If more coverage is needed, use a larger tip
rather
than increasing the pressure.
c.
Test
the spray pattern. T
o adjust the direction of
the spray pattern, engage the gun safety latch
and loosen the retaining nut. Position the tip
guard
horizontally for a horizontal pattern or ver
-
tically
for a vertical
pattern. Then tighten the re
-
taining nut.
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