Operation - Graco EM 490 Instructions-Parts List Manual

OPERATION
WARMING
Pressure Rellef Procedure
To reduce the risk of serious bodily injury, in-
cluding injection; splashing in the eyes or on the
skin; injury from moving parts or electric shock,
always follow this procedure whenever you shut
off
the sprayer, when checking or servicing any
part of the spray system, when installing, cleaning
or changing spray tips, and whenever you stop
spraying.
2.
Turn the ON/OFF switch
to
OFF.
1. Engage the gun safety latch.
3..
Unplug the power supply cord.
4. Disengage the gun safety latch.
6. Hold a metal part of the gun firmly to the
side of
a
grounded metel pail, and trigger
the gun to relieve pressure.
6.
Engage the gun safety latch.
7.
Open the drain velve/pressure relief valve,
havino a container reedv to catch the-.
drainage.
8.
Leave the drain valve o w n until
YOU
are
reedy to operate the sprayer again.
If you
suspect that the sprey tip or hose
is com-
pletely CLOGGED,
OR
THAT PRESSURE HAS
N O T BEEN FULLY RELIEVED efter
folowina
the
steps
above, VERY SLOWLY loosen the tip iuerd
pressure gradually. Then loosen the nut complete-
retaining nut or hose end coupling and relieve
ly. Now clear the tip or hose obstruction.
1. Prime the Sprayer with Paint.
a.
Close the filter drain valve/pressure relief valve.
b. Don't install the spray tip yet1
c. Put the suction tube into the paint container.
d. Turn the pressure adjusting knob ell the way
e. Disengage the gun safety latch.
counterclockwise to lower the pressure setting.
f.
Hold e metal pert of the gun firmly against and
aimed into e grounded metal waste container.
See Fig 4. Squeeze the trigger end hold it
open, turn the ON/OFF switch to ON, and
sprayer starts. Keep the gun triggered until all
slowly increase the pressure setting until the
flows freely from the gun. Release the trigger
air is forced out of the system end the paint
end engage the safety.
NOTE:
If the pump is herd to prime, place a con-
tainer under the drain velve/pressure relief
valve and open it. When fluid comes from
the valve, close it. Then disengage the gun
safety and proceed as in Step If, above.
g.
Check all fluid connections for leaks. If any am
found, follow the Preclsure Relief Procedure
tions.
Warning. above, before tightening connec-
2. Install the Spray
Tip end Tip Guard
IRefer to Fig 5.)
a. Be sure-the gun safety latch is engaged.
b. Unscrew the retaining nut from the gun.
c. Install the spray tip.
If u8lng the RAC //I Spray Tip K/t, install the
AAC 111 spray housing, with the tip installed.
Keep the instructions for leter reference.
d. Tighten the retaining nut bv hand until snun.
MAINTAIN FIRM
METAL-TO-METAL
CONTACT BETWEEN
GUNANDGROUNDED
METAL CONTAINER
' 0
Fig 4
BE SURE G U N S A F E N LATCH
IS ENGAGED1
CAUTION
seat gasket and result in leakage.
Overtightening the retaining nut will damage the
3. Adjusting the Spray Pattern (Refer to Fig 6.1
a. Increase the pressure adjusting knob setting
just
until spray from the gun is completely
atomized. To avoid excessive overspray and
fogging, and to decrease tip wear and extend
the life of the sprayer, always
use
the lowest
results.
possible pressure needed to get the desired
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 gun safety
latch and loosen the retaining nut. Position the
tip so the groove is horizontal for
a
horizontal
pattern or
vertical
for
a
vertical pattern. Then
tighten the retaining nut.
U& a wrench to tigtkn theretaining nut abiiut
1/8 to 1/6
turn.
10
307-735