W.R. BROWN Speedy Sprayer 331-A User manual

OPERATING INSTRUCTIONS AND PARTS LIST
"THREE WAY"
HEAVY DUTY SPRAY GUN
NO. 331
•Cvf^rr.-! m;^ *^r-5c:„re Feed
—
For Latex Paints
•Internal Mix Pressure Feed—For Oil Base Paints
iol Mix Syphon Feed—For Lacquers and Enamels
MODEL
331 -A
This is the model number of your
spray gun. Always furnish model
number when writing about sprayer
or ordering repair parts.
This list is valuable. It will assure
your being able to obtain proper parts
service at all times. We suggest you
keep it with other valuable papers.
W. R. BROWN
2701 N. Normandy Ave., CORPORATION
Chicagj^ Illinois 60635

OPERATING INSTRUCTIONS
Model No. 331 -A Spray Gun
This gun was thoroughly tested and was found to op-
erate perfectly before leaving the factory.
TYPE OF GUN
This spray gun serves three specific and different
painting functions. First as .an "External Mix,"
"Pressure Feed" type it renders fast application of
latex paints. Second as an "Internal Mix," "Pres-
sure Feed" type it delivers maximum efficiency in
the spraying of oil based paints. Third as an "Ex-
ternal Mix, ""Syphon Feed" type it gives extremely
fine atomization for smooth finishes with fast dry-
ing lacquers and enamels.
HOW TO USE
EXTERNAL MIX PRESSURE FEED -Attach the die
cast nozzle with side vents to the gun. Make sure
that the socket head set screw is in place in the cup
cover, (gun is shipped from factory in this manner).
INTERNAL MIX PRESSURE FEED -To convert
from external mix pressure feed to internal mix
pressure feed, simply replace die cast external
mix nozzle with steel internal mix nozzle. Internal
mix fan nozzle is furnished with the gun. Round and
angle nozzles are available on special order.
EXTERNAL MIX SYPHON FEED -To convert this
gun to external mix syphon feed, remove the air
nozzle and liquid nozzle from the gun. Use the small
hex wrench furnished with the gun to remove the
small socket head screw from the cup cover. Screw
this socket head screw into the small threaded open-
ing on the face of the gun where the liquid nozzle
was removed. Replace the liquid nozzle and attach
die cast external mix nozzle. Do not attempt to use
internal mix nozzles when gun is assembled for
syphon feed spraying.
"BLEEDER" or "NON-BLEEDER." This spray gun
has abuilt in air valve that can be changed for
bleeder or non -bleeder operation. When shipped
for use with portable air compressors having no air
storage tank the spray gun is always assembled for
"BLEEDER" operation, which means the air will
pass continuously through the nozzle when trigger is
released as well as when spraying. To change this
gun to a"NON-BLEEDER" type, remove lower pack-
ing screw at upper rear of gun. Remove spring and
small air valve screw, and slip air valve washer
over threads of air valve screw. Reassemble gun.
The spray gun is assembled at the factory with the
lower end of the liquid" tube facing forward toward
the nozzle end of the gun. This position is most
satisfactory for floors and vertical surfaces. For
ceilings screw in pipe one half turn so that lower
end of liquid pipe faces rear or handle end of gun.
Before spraying, the aluminum cup should be screwed
against the gasket tight enough to prevent excessive
air leakage at th:s point. Aslight amount of air leak-
age at this point will not prevent the gun from spray-
ing properly, but care must be taken not to nick the
top of the cup or to use defective gaskets which will
permit alarge air leakage, or the gun will not spray
satisfactorily.
If leakage of paint occurs through packing gland nut
around the needle pin, tighten the packing gland nut
just tight enough so that the needle will still move
freely. An occasional drop of light machine oil on
packing leather will keep it soft and help prevent
leakage.
TWO SPRAYING ADJUSTMENTS PROVIDED
The air adjusting screw is the upper of the two
knurled knobs at the rear of the gun. This controls
the amount of air supplied to the spray nozzle.
The trigger stop screw is the lower of the two
knurled knobs. This- adjusts the amount of trigger
movement which controls the amount of needle valve
opening regulating the flow of paint.
^For most spraying application the two adjusting
knobs should be in the open position to allow for
maximum air delivery and trigger opening. Differ-
ent adjustments of the positions of these adjusting
knobs will produce awide range of spraying results.
SAFE WORKING AIR PRESSURES
This spray gun is designedto operate most efficient-
ly at air pressures between 30 and 50 pounds. In no
case should more than 50 lbs. pressure be used on
this gun.
HARDENED STEEL NEEDLE AND NOZZLES
The needle pin, liquid nozzle and internal mix air
nozzles are all precision made of steel and hardened
to resist the cutting action of abrasives found in
many paints
.
USING 2V2 GALLON PRESSURE PAINT TANK
For paint tank operation remove the socket head
screw from the cupcover and screw into the face of
the gun by the liquid nozzle, the same as for exter-
nal mix syphon feed operation. Then remove quart
cup, liquid tube, cup cover casting and sleeve nut
and attach paint hose at this point.
DIRECTIONS FOR SPRAYING
1.Thoroughly mix the material, adding thinners as
indicated on label. Most materials in common use
will spray readily if thinned according to the manu-
facturer's instructions for brushing. However, if
material still appears too thick, add alittle more
thinner, determining the amount by testing mixture
in gun. Be sure the material you use for spraying
is clean, and free from lumps. Strain it through
cheese cloth, regular paint strainer or apiece of
common screen wire.

OPERATING INSTRUCTIONS
2. Fill the cup about three-quarters full. Start elec-
tric motor. Make sure that Air Compressor is near
enough to the work to allow afull movement of the
gun at 4to 8inches from the surface to be painted.
(Be sure that spray or fumes cannot reach any flame,
and that there is plenty of ventilation.)
3.Make your "pattern. "Hold the nozzle of the gun
about 6inches away from asheet of cardboard or
paper, pull the trigger and release it quickly as
possible. The resulting pattern shows whether the
gun is properly adjusted to proceed with work. The
round pattern is preferred for small irregular sur-
faces, and the flat pattern for large areas. Practice
handling the gun on cardboard or waste to get the
feel of painting.
4. Begin spraying. Keep the gun at right angles to
your work --by flexing your wrist at each end of
every stroke. Never allow astiffly held wrist to
"arc" the stroke. This is afault common to begin-
ners. Arcing causes poor distribution of materials;
too much at the center of each stroke.
5
.
Keep the distance between nozzle and work uni-
formly between 6and 8inches. Always keep the
gun in motion. If you hold it in one spot, your ma-
terial will "pile up" and an un-even coating will re-
sult.
6. Learn to "trigger" your gun -- to start and stop
the material properly. This means the gun must be
moving at the beginning of the stroke before the
trigger is pulled. Likewise the trigger must be re-
leased before the gun stops moving at the end of the
stroke. This "feathers" or blends each stroke with
the next without showing unevenness or "laps."
7.Overlap your strokes on aflat surface just enough
to secure an even coating. Afew strokes on some
"Practice" surface will quickly develop the needed
skill.
8. Use a"frisket" or cardboard shield to catch
overspray at edges of work and to protect surfaces
not to be painted. Where clean separation on any job
is required, as in 2-tone finishing, masking tape
should be used to cover areas not to be painted.
CLEANING INSTRUCTIONS- IMPORTANT
The spray gun must be thoroughly cleaned after
using, as paint materials dry quickly in nozzle
passages. To clean your Spray Gun, empty and
wipe out the cup. Pour asmall amount of solvent
or thinner in cup, screw on tight, and hold trigger
open until the thinner has been blown through the
nozzle as in painting. The gun should be shaken
while doing this to thoroughly wash out the cup.
Stopping and releasing the spray at the nozzle with
the finger tip, causes the thinner to surge violently,
and helps clean the material passages in the gun.
Finish by wiping off the air and fluid nozzles, and
cup with cloth that has been moistened with solvent.
paint remover has softened paint in air and paint
passages in gun handle, take asmall soft wire and
push this back and forth through all air and paint
passages until they are open and clean. Reassemble
gun after all parts have been wiped clean and place
2or 3drops of light machine oil on packing leather
to keep it soft .If packing leather is dry and hard or
worn it should be replaced.
CAUTION
For amore thorough cleaning when paint and air
passages are clogged with paint and gun is not oper-
ating properly, disassemble gun and soak all metal
parts in thinner or paint remover. After thinner or
DO NOT USE LYE OR ANY OTHER CAUSTIC
ALKALI SOLUTION FOR CLEANING THE GUN OR
CUP AS THEY ATTACK ALUMINUM ALLOYS.

TROUBLE CHART
TROUBLE

ILLUSTRATED PARTS LIST
AA
CC.
IIHLMEE W
Model No. 331 -A Spray Gun
REF.

t
331-10-66