Operation - Graco EM 390 Instructions-Parts List Manual

OPERATION

WARNING
Pressure Relief Procedure
To reduce the risk of serious bodily injury, in-
cluding injection; splashing in the eyes; injury
from moving parts or electric shock, always follow
this procedure whenever you shut
when checking or servicing any part of the spray
system, when installing, cleaning or changing
spray tips, and whenever you stop spraying.
1. Engage the gun safety latch.
2.
Turn the ON/OFF switch to OFF.
3.
Unplug the power supply cord.
4. Disengage the gun safety latch.
a
5. Hold metal part of the gun firmly to the
a
side of grounded metal pail, and trigger
the gun to relieve pressure.
6.
Engage the gun safety latch.
7.
Open the drain valve/Dressure relief valve.
having a container ready to catch the
drainage.
Leave the drain valve/pressure relief Valve
open until you are readv to omrate the
OR
pletely CLOGGED,
NOT BEEN FULLY RELIEVED after following the
steps above, VERY SLOWLY loosen the tip guard
retaining nut or hose end coupling and relieve
pressure gradually. Then loosen the nut complete-
ly. Now clear the or hose obstruction.
Prima the Sprayer with
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 all the way
counterclockwise to lower the pressure setting.
e. Disengage the gun safety latch.
f. Hold e metal pert of the gun firmly against and
aimed into a grounded metal waste container.
4.
See Fig Squeeze the trigger and hold
open, turn the ON/OFF switch to ON, and
slowly increase the pressure setting until the
sprayer starts. Keep the gumtriggered until all
air is forced out of the system and the aint
flows freely from the gun. Release the tr
and engage the safety.
NOTE:
If the pump is hard to prime, place a con-
tainer under the drain valve/pressure relief
valve and open
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 are
found, follow the Pressure Rellef Procedure
Warning. above, before tightening connec-
tions.
2. Install the Spray Tlp and Tip Guard
. to Fio
.
a.
b. Unscrew the retaining nut from the gun.
c. Install the spray tip.
RAC I O spray housing, with the tip installed.
Keep the packaging instructions for later
reference.
off
the sprayer,
THAT PRESSURE HAS
Paint.
it
gger
When fluid comes from
it.
4
Fig
BE SURE GUN SAFETY LATCH
IS ENGAGED1
d. Tighten the retaining nut by hand until snug.
Use a wrench to tighten the retaining nut about
e.
1/8 to 1/6 turn.
CAUTION
Overtightening the retaining nut will damage the
seat gasket and result in leakage.
3.
Adjusting the Spray Pattern (Refer to Fig 6.1
Increase the pressure adjusting knob setting
a.
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
possible pressure needed to get the desired
results.
b. If more coverage
rather than increasing the
of the spray pattern, engage the gun safety
latch and loosen the retaining nut. Position the
tip the groove is horizontal for a horizontal
so
pattern or vertical for a vertical pattern. Then
tighten the retaining nut.
GOOD
FULL
Fig 6
MAINTAIN FIRM
METAL-TO-METAL
CONTACT BETWEEN
GUNANOGROUNDED
METAL CONTAINER
needed, larger tip
is use e
pressure.
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