Maintenance - Graco EM 390 Instructions-Parts List Manual

4. Cleaning Clogged Tip
a
W A R N I N G
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 gun safety latch immediate-
ly, then follow the procedure in Steps 4a-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 daily
operation. First, follow the Pressure Relief
Procedure Warnlng on page
solvent-soaked brush to keep fluid from
building up and clogging the tip.
b. If the spray tip does clog, release the gun trig-
ger, and engage the gun safety.
c. If using the RAC Ill Spray Tip Kit, rotate the
RAC 111 handle 180". See Fig
gun safety, and trigger the gun into
waste container. Engage the gun safew-again.
Return the handle to the original position.
If using a spray tip kit which is not self-
cleaning, VERY SLOWLY loosen the tip guard
retaining nut or hose end coupling, and relieve
pressure gradually, then loosen completely.
Clear the tip or hose, than reassemble.
d. Disengage the gun safety, and resume spraying.
e. If the tip is still clogged, engage the gun safety,
shutoff and unplug the sprayer, and open the
drain valve/pressura relief valva to reliava
pressure. Remove the spray tip and clean it. In-
structions for cleaning the RAC 111 Spray Tip Kit
are given on the packaging supplied with the
kit.

MAINTENANCE

1. Check the pecking nut/wet-cup 'daily. First
follow the Pressure Relief Procedure Warning
on page 10. Be sure the wet-cup is
et ell 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 waar.
driver and light hammer to adjust the nut. See
8.
Fig
2.
Clean the fluid fllter often and whenever the
sprayer is stored. First follow the Pressure Relief
Procedure Warning on page
307-273,
supplied, for the cleaning procedure.
3.
Flush the sprayer et
and fill it with mineral spirits to help prevent pump
corrosion end freezing. See "F/ushing Guidelines"
on page 12.
CAUTION
Never leave water or any paint in the sprayer ovar-
night to: (1) prevent pump corrosion:
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, follow the Pressure
Relief Procedure Warnlng on page 10, and
10. Then use a
7. Disengage the
a grounded
full of TSL
Use
a screw-
10.
Refer to manual
the end of each work day
prevent
Fig 7
Fig
4. For very short shutoff periods, leave the suction
tube in the paint, follow the Pressure Relief Pro-
cedure Warning on page
tip.
5. Coil the hose and hang
storing it, w a n for overnight, to help protect the
hose from kinking, abrasion, coupling damage, etc.
6. For the low profile cart, secure the suction hose
assembly to the brackets on the side of the cart.
W A R N I N G
Refer to the warning section HOSE SAFETY on
3
page for information on the hazard of using
damaged hoses.
\
10,
and clean the spray
on the hose rack when
it
307-724
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