301-279
ORACO
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;$;This manual contains IMPORTANT
...
%WARNINGS
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iji
READ AND RETAIN
I
and INSTRUCTIONS
FOR
REFERENCE
.:..
2
$'
5
rev%"
Supersedes
JULY,
JAN.,
1977
1977
ED
PORTABLE ELECTRIC/AIRLESS PAINT SPRAYER
MODEL
3WOps;
250
215-250
(210bar)
Series
MAXIMUM
"A"
WORKING
PRESSURE
An improved electric diaphragm sprayer for the contractor
or
maintenance painter with limited production, low
volume coatings
1
-"xed*:"q
.AZ~~S~~~~~
jobs.
GRACO
INC.
P.O.
BOX
1441
Minneapolis,
@
COPYRIGHT
1977
MN
GRACO INC.
55440
iB2F
:.:.:.:.:::::j
.:.:.::::.:.:.:SAFETY
...
Federal safety standards have been adopted under the Occupational Safety and Health Act. These standards
larly the Generai Standards, Part
with your use of airless spray painting equipment.
PRECAUTIONS
1910,
0
and the Construction Standards, Part
p@)RuANu
READ
1926
..should be consulted in connection
and
UNDERSTAillD~?$i
--
particu.
READ THESE WARNINGS BEFORE USING
KEEP AWAY FROM SPRAY
The ED
(210 bar).
pressure stream of paint can pierce your skin and cause
physical harm.
HANDLE
LOADED FIREARM!
anyoneelse.
against injection injuries. Never put your hand, fingers or
body directly over the spray tip.
Always have the tip guard in place while spraying.
Whenever spraying
ally by
motor and open the prirninglpressure relief
pressure in the system. Then engage the trigger safety.
Fig
the motor does not relieve the high pressure in the pump,
hose and gun. Also loosen tip guard, gun or hose con-
nections slowly before removing completely for cleaning
or service.
This
paint.
Do not
unit, relieve pressure, engage the trigger safety and pull
the electrical plug before leaving.
ALWAYS tighten threaded connections carefully and secur-
ely, and handle paint hose with care. Abuse such
kinking or crushing could damage hose and cause dangerous
high pressure leaks. Check the condition of hoses daily.
Be sure that the hoses, swivels, guns, etc. that you use are
capable of withstanding the pressure developed by this unit
(up to
250
pumps paint
If
you spray yourself
THE
SPRAY GUN AS CAREFULLY AS
The tip guard can provide additional protection
a
plugged spray tip,
1.
THIS
IS
IMPORTANT because shutting
is not an air spray unit;
leave
a
pressurized unit unattended. Shut off the
3000
psi or
210
at
high pressure, up to 3000 psi
at
close range, the high
NEVERpointthegunatyourselfor
is
stopped, intentionally or unintention-
always
DO
bar).
NOT
shut
try to
off
the electric
valve
to relieve
"blow
off
as
A
See
only
back"
out
sharp
PREVENT STATIC SPARKING
The
fast
movement of paint through the spray tip may
static
develop
a
fire by igniting paint fumes. The hazard
you are using latex paint, but
guard against static sparking
or stain, flushing with solvent or working where flammable
fumes or dust are in the air.
Be
sure the gun
and by only plugging into
circuit. If the object you
be grounded also.
Always use the lowest pressure possible when flushing and
hold gun firmly against metal waste container. When using
flammable solvents, the waste container must be grounded
also.
Follow the paint
cautions and, warnings.
electricity. If
is
grounded by using conductive paint hoses
and
it
sparks, the spark might start
is
not
so
great if
it
is
especially important to
if
you are using oil base paint
a
3-wire grounded electric supply
are
painting
solvent manufacturer's safety pre.
is
conductive, it must
KEEP CLEAR OF MOVING PARTS
Don't stick your fingers into the slots in the electric motor
fan cover. Always check
before plugging in the power cord.
The electric motor has an overheating protection device
automatically
which
beforeexaminingorworking
shut off the unit, relieve pressure and pull out the electrical
This
plug.
expectedly.
PLUG
This
to protect you from getting
will avoid the hazard
IN
PROPERLY
is
an electric machine.
to
be sure the switch
restarts the motor when
on a motor which has stopped,
of
the motor starting un-
It
has a 3-prong grounding plug
a
shock.
it
is
cools.
OFF
So,
i
I
'I
I
I
If an injury occurs, seek immediate medical care from
Do
doctor.
doctor or the hospital emergency room doctor exactly
what fluid was injected.
Once
pump head if
page
2
307-279
not treat as a simple cut!
a
year, check the pump outlet pressure. Replace the
the
pressure exceeds 3600 psi
5
for details.
Be
ready to
(250
tell
bar).
your
See
a
Be sure to plug the unit into a properly grounded outlet
Do
that will accept the 3-prong plug on the cord.
remove the
-AND
=GREEN-TO UNIT
Plug into an outlet
you are spraying.
3 wires of
long.
thirdprong.
TO
SWITCH
MOTOR
CHASSIS AND
FRAME
at
least
MOTOR
at
least
20
ft
(6
m) from the area where
If
you
use
an extension cord,
16
gauge, and should not be over
GROUND
PRONG
it
nor
must have
100
I
ft
ON-OFi
PRESSURE CONTROL PRlMlNGlPRESSURE RELIEF VALVE
PRIMING BUTTON SUCTION TUBE
IShown
in
clnrad
position)
RETURN TUBE
Fig
1
OPERATION
Operating your
you follow these instructions. But first, be sure you under-
stand the safety warnings
safety features for airless spray painting. but you are
responsible for following proper,
Assemble the unit
on pages
are tight,
flushing and priming.
Flush out the new unit with mineral spirits before pump
ing paint: This
rust prevention. Follow this procedure:
1.
Turn
the
2.
Pour half a gallon of mineral spirits into a bare metal
Put
pail.
ED
250
will be simple and trouble free
on
page 2. This unit has several
safe
procedures.
as
shown in
8
and
9.
Make sure
Don’t install the spray tip yet; wait until after
is
to remove oil used for factory testing and
pressure control knob
the suction tube into the pail.
Fig
1
and the parts drawing
all
threaded hose connections
all
the way clockwise.
still
if
-
3.
Open the priming
so
it
is
Parallel to the
4. Check to-be sure the ON-OFF switch
position, then plug the power cord into
grounded
5.
When the fluid flows evenly and the unit
clean, turn the pressure wntrol knob
counterclockwise to reduce pressure.
into
firmly touching the container, trigger
the priming
and gun. This procedure avoids splashing and static
sparking.
NOTE:
115
a
bare metal waste wntainer and with the gun
If
the unit has trouble priming, the inlet ball check
may be sticking. To remedy
valve.
Turn the handle a quarter turn
valve
body.
See
Fig
1.
is
volt
60
Hz
AC outlet. Switch the unit ON.
Now
the
gun and close
valve.
This will pressurize and prime the hose
this,
press
in the OFF
a
properly
is
flushed
all
the way
point the gun
the
prim-
\
6.
Check
necessary.
7. Trigger the gun again into the waste container, When
clean solvent appears,
container and pump the mineral spirits out of the unit.
Before using any water-base material, flush the unit with
watertocompletely removethemineral spirits.Clean the
in-line filter
8.
After flushing the unit, put the suction tube in the paint
container. Prime the unit the same
pressure control knob clockwise and open the priming
valve).
the waste container.
9.
When paint flows from the gun, close the gun, shut off
the unit, open priminglpressure relief
pressure, engage the trigger safety and install the spray
tip in the gun. Refer
special Hydra-Spray Gun instructions.
10.
Close the relief
pressure down to the proper
The spray gun and tip, pump and even the electric
motor will
as
low
sprays paint effectively. higher pressure gains nothing,
it
only increases wear on
pump unit.
Turn off the unit when taking
etc.
The unit may lose
few minutes without triggering gun.
LTRIGGER
TIP GUARD
ing button rapidly
running.
all
paint line connections for leaks. Tighten
as
shown in instruction manual 307-245.
Close the priming
SAFETY
take
LATCH
several
valve
times with the unit
the suction tube out of the
as
before (turn the
and trigger the gun into
valve
to
instruction manual 307-046 for
valve.
You are now ready to reduce the
level
for spray painting.
last
longer
if
you keep the spraying pressure
as
possible. Once you reach the pressure that
the
gun needle, spray tip and
a
break, moving scaffolds,
its
prime
if
left
running more than
to release
if
a
307-279
3
~~
PREPARING PAINT FOR USE
Prepare the paint or other coating according to the manu-
If
facturer's instructions.
the paint has been opened before,.
remove any skin that has formed. Stir paint thoroughly to
a
dissolve hard pigments. Strain the paint through
nylon mesh bag (available
at
most paint dealers) to remove
particles that might clog filters or spray tip. This
fine
is
probably the most important step toward trouble-free
spray painting.
New paint seldom needs thinning, but old and remixed
paint that has lost some solvent through evaporation needs
HYDRA-SPRAY TECHNIQUE
Good Hydra-Spray technique
spraying with air, except that you hold the gun further
from work surface, you get more coating thickness, which
less
results in
pattern overlapping, and you use a more
positive action when triggering the gun.
is
much like conventional
See
Fig 2.
it
replaced. Follow the paint manufacturer's recommenda
tions on thinning. Be careful not to add too much solvent,
as
thin paint
is
hard to control and doesn't cover very well.
Some paints thin out from being stirred. These are called
If
thixotropic paints.
can use your
ED
you are using a thixotropic paint, you
250 to "stir" or agitate the paint for you.
With the suction tube and return tube in the paint,just run.
valve
the unit for several minutes with the priming
open.
This will also tend to warm the paint, which also helps to
it.
thin
HOLD GUN
14"
to
16
1350-400
mml
FROM SURFACE
Hold the gun 14-16 in. (350-400 mm) from the work. The
distance varies with the covering ability of the paint, type of
Also
surface to be sprayed and desired spray pattern.
keep
the gun perpendicular to the surface.
Try to maintain an 8-12 in. (200-300 mm) fan width (width
a
of spray pattern). This makes
good, wet spray pattern. If
you can't stay perpendicular to the surface and within 14
(350
mm),
in.
use a spray tip with a narrower fan angle to
keep the proper fan width.
Runs, sags, or thin coating can result from poor operator
technique, but are usually caused by improper tip
Remember
giving
too,
a
wetter coat.
that
as
a
tip wears, the fan angle narrows,
size.
With each stroke, trigger the gun open just before reaching
a
the work; use
positive "full open-full close" triggering
action.
Have the gun in motion off the work before triggering gun
open and release trigger after the pattern has left the work,
the
gun
at
a
if possible. Move
constant speed through the
entire stroke.
WRONG APPROACH
GUN
KEEP
HAVE GUN
IN MOTION
BEFORE
TRIGGERING STROKE STILL MOVING
Fig
2
PERPENDICULAR
MAINTAIN RELEASE
EVEN SPEED TRIGGER
ALL THROUGH WITH GUN
TO
SURFACE
For a wider spray pattern, hold the gun farther from the
a
work or use
give you
thickness,
a
heavier coating, make slower strokes with the gun or
For
tip with a wider fan angle. However, this will
a
thinner
also
use
coating
larger
a
so
size
to
maintain the same coat
spray tip.
hold the gun closer to the work. However, this will give you
a
narrower spray pattern
width the tip must be changed to one with
a
angle. Otherwise
larger
size
tip.
heavier coat can be had by changing to
so
to maintain the same pattern
a
greater fan
a
When spraying complex shapes or objects with critical areas,
work out the best combination of spray gun movements to
or
sags.
get good coverage without excess paint buildup
Fig
3.
See
PAINT TOP
SURFACE
Fig
3
4
307-279
PAINT WILL BU
AND TEND TO SAG
PAINT BOTTOM
SURFACE
OVERLAP
STROKE
FIRST
$&,
OVERLAPSECOND
STROKE STROKES
OVERLAP
3rd
AN0
4th
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