Shutdown & Care - Graco EM 490R EM 490 Instructions-Parts List Manual

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. Trigger the gun into a grounded
waste container. Engage the gun safety latch
again. Return the handle to the original position.
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.
CAUTION
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.
OPERATION
d. Disengage the gun safety latch, and resume
e. If the tip is still clogged, engage the gun safety
f.
Fig 5
SHUTDOWN AND CARE
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.
Refer to the warning section HOSE SAFETY on
page 3 for information on the hazard of using dam-
aged hoses.
Keep filled with TSL during
operation. Tighten nut by
Fig 6
If using a spray tip kit which is not self-clean-
ing, VERY SLOWLY 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.
spraying.
latch, shutoff and unplug the sprayer, and open
the pressure drain valve to relieve pressure. Re-
move the spray tip and clean it.
Instructions for cleaning the RAC IV are given
in manual 307–848.
ROTATE
HANDLE
180
WARNING
PACKING NUT/WETCUP
turning clockwise