Graco 220-726, Instructions And Parts List

Page: 11 / 38

OPERATION
Fig 11–1
SPOTTY
PATTERN
–
INCREASE
PRESSURE
GOOD
FULL
PATTERN
Fig 11–2
ROTATE HANDLE 180
AND TRIGGER GUN TO
REMOVE CLOG
0668
RETAINING NUT
TIP GUARD SHOWN
IN POSITION FOR A
VERTICAL SPRAY
PATTERN
3. Adjust the spray pattern.
a. Increase the pressure setting just until spray from
the gun is completely atomized. See Fig 11–1. To
avoid excessive overspray and fogging, and to
decrease tip wear and extend the life of the spray-
er, always use the lowest possible pressure ne-
eded to get the desired results.
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
the spray pattern, engage the trigger safety latch
and loosen the retaining nut. Position the tip
guard horizontally for a horizontal pattern or verti-
cally for a vertical pattern. Then tighten the retain-
ing nut. See Fig 11–2.
4. Cleaning a Clogged Tip
To reduce the risk of serious bodily injury from in-
jection, use extreme caution when cleaning or
changing spray tips. If the spray tip clogs while
spraying, engage the trigger safety latch immedi-
ately, then follow the procedure in Steps 4a to 4e,
below.
NEVER wipe off buildup around the spray tip until
pressure is fully relieved and the trigger safety latch
is engaged.
WARNING
a. Clean the front of the tip frequently during opera-
tion.
First the relieve pressure; see page 9. Then
use a solvent–soaked brush to clean the tip and
to reduce fluid build up and tip clogging.
b. If the spray tip does clog, release the gun trigger,
and engage the trigger safety latch.
c. If using the RAC IV Spray Tip Kit, rotate the RAC
IV handle 180
. See Fig 11–2. Disengage the
trigger safety latch. Trigger the gun into a
grounded waste container. Engage the trigger
safety latch again. Return the handle to the origi-
nal position.
If using a spray tip which is not self-cleaning,
VERY SLOWLY loosen the tip guard retaining nut
or hose coupling to relieve pressure gradually,
then loosen the part completely. Clear the tip or
hose obstruction, and reassemble it.
d. Disengage the trigger safety latch, and resume
spraying.
e. If the tip is still clogged, engage the trigger safety
latch, shutoff and unplug the sprayer, and open
the pressure drain valve to relieve pressure. Re-
move the spray tip and clean it.
f. Instructions for cleaning the RAC IV are given in
manual 307–848.