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307-735 11
OPERATION
4. Cleaning a Clogged Tip
WARNING
To
reduce the risk of serious bodily injury from injec
-
tion,
use extreme
caution when cleaning or chang
-
ing
spray tips. If the
spray tip clogs while spraying,
engage the gun safety latch immediately, then fol-
low
the procedure in Steps 4a to 4e, below
.
NEVER wipe off buildup around the spray tip until
pressure
is fully relieved and the gun safety latch is
engaged.
a. Clean
the
front of the tip frequently
during op
-
eration.
First 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 trig
-
ger,
and engage the gun safety latch.
c. If using the RAC IV Spray Tip Kit, rotate the
RAC IV handle 180_.
See Fig 5.
Disengage the
gun
safety latch. T
rigger the gun into a grounded
waste container. Engage the gun safety latch
again.
Return the handle to
the original position.
If
using a spray tip kit which is not self-clean
-
ing,
VER
Y SLOWL
Y loosen the tip guard retain
-
ing
nut or hose coupling to
relieve pressure grad
-
ually, then loosen the part completely. Clear the
tip
or hose, and then reassemble it.
d. Disengage the gun safety latch, and resume
spraying.
e. If
the tip is still clogged,
engage the gun 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.
Fig 5
ROTATE
HANDLE
180_
SHUTDOWN
AND CARE
1. Check
the packing nut/wet–cup daily
.
First relieve
pressure; see page 9. Be sure the wet–cup is 1/3 full
of
TSL at all times
to help prevent fluid buildup on the
piston rod and premature wear of packings. The
packing nut should be tight enough to stop leakage,
but
no tighter
. Overtightening may cause binding and
excessive
packing wear
.
See Fig 6.
2. Clean the fluid filter often and before storing the
sprayer.
First relieve pressure; see page 9. See man
-
ual 307–273, supplied, for the filter cleaning proce-
dure.
3. Flush
the sprayer at the end of each work day
and
fill it with mineral spirits to help prevent pump corro-
sion
and
freezing. See
FLUSHING GUIDELINES
on
page
12.
Never
leave water or any paint in the sprayer
over
-
night
to: (1) prevent pump corrosion;
(2) prevent the
fluid
from freezing in the pump and pressure control
which
can
cause loss of pressure, stalling or serious
sprayer
damage.
Always
use mineral spirits for the final flush, relieve
pressure
and leave the mineral spirits in the
sprayer
.
CAUTION
4. For very short shutoff periods, leave the suction
tube in the paint, relieve pressure, and clean the
spray
tip.
5. Coil
the hose
and hang it on the hose rack when stor
-
ing
it, even for overnight, to
help protect the hose from
kinking,
abrasion, coupling damage, etc.
6. For the low–profile cart, use the brackets on the
side
of the cart to hold the suction assembly
.
WARNING
Refer to the warning section HOSE SAFETY on
page
3 for information on the hazard of using dam
-
aged
hoses.
Fig 6
PACKING
NUT/WETCUP
Keep filled with TSL during
operation. Tighten nut by
turning clockwise