DeVilbiss JGA-503 User Manual
SERVICE BULLETIN
SB-2-253-I
Replaces SB-2-253-H
■Major Repair Kit KK-4987-2
Minor Repair Kit KK-5034
JGA-503 CONVENTIONAL SPRAY GUN
IMPORTANT: Before using this equipment, read all safety precautions and instructions. Keep for future use.
DESCRIPTION
The standard JGA-503 spray gun is a
general purpose, heavy duty, high production spray gun suitable for use with most
types of materials. The fluid passageway is
plated brass, aluminum and stainless steel.
The fluid tip and needle is stainless steel.
Halogenated hydrocarbon solvents
- for example; 1, 1, 1 - trichloroethane
and methylene chloride - can chemically react with the aluminum in
this gun and cause an explosion
hazard. Read the label or data sheet
for the material you intend to
spray. Do not use spray materials
containing these solvents with this
spray gun.
Important: This gun may be used with
most common coating and finishing materials. It is designed for use with mildly
corrosive and nonabrasive materials. If
used with other high corrosive or abrasive materials, it must be expected that
frequent and thorough cleaning will be
required and the necessity for replacement of parts will be increased.
INSTALLATION
1. Attach the air supply line to the air
inlet (24). An air transformer installed
as close as possible to the gun will
provide filtered and regulated air.
Note
When larger diameter air hoses
are used, it is advisable to use an
8' or 10' "whip end" or a smaller
diameter hose at the gun for
greater flexibility or movement.
2. Attach the suction feed cup or fluid
hose to the material inlet.
Note
Protective coating and rust inhibitors
have been used to keep the gun in
good condition prior to shipment. Before using the gun, flush it with solvents so that these materials will be
removed from fluid passages.
OPERATION
Mix, prepare and strain the material to be
sprayed according to the paint
manufacturer's instructions.
Strain material through a 60 or 90 mesh
screen.
1. Fill the suction or pressure feed cup
with the material. Do not overfill. Make
sure that the cup lid vent hole is clear,
if using a suction cup.
2. Turn on the gun air at the source of
supply. Adjust the atomization air pressure to 35 psi.
3. Turn on the supply air to the pressure
cup if used.
4. Open the spreader adjustment valve
(25) (Fan) by turning the valve stem
counter-clockwise.
5. Open the fluid needle adjusting screw
(28) by turning counter-clockwise.
6. Spray a test area.
If the finish is too sandy and dry, the
material flow may be too low for the atomization air pressure being used.
If the finish sags, there is too much material
flowing for the atomization air pressure
being used.
Both of the above can be corrected by
increasing or decreasing the atomization
air pressure or the material flow. Pattern
width can be altered by turning the spreader
adjustment valve (25), either clockwise to
decrease the width or counter-clockwise
to increase the width.
See Spray Gun Guide SB-2-001 (latest
revision) for details concerning set up of
spray guns.
■Government NSN No. 4940-01-046-9919 = KK-4987-2
PREVENTIVE MAINTENANCE
To clean air cap and fluid tip, brush exterior
with a stiff bristle brush. If necessary to
clean cap holes, use a broom straw or
toothpick. Never use a wire or hard in-
strument. This may scratch or burr holes
causing a distorted spray pattern.
To clean fluid passages, remove excess
material at source, then flush with a suitable solvent using a device such as the
SolventSaver™ (see Accessories). Wipe
gun exterior with a solvent dampened
cloth. Never completely immerse in solvent as this is detrimental to the lubricants
and packings.
Note
When replacing the fluid tip or fluid
needle, replace
time. Using worn parts can cause
fluid leakage. Matched or lapped
sets are available for most pressure
feed combinations. See Chart 3.
Sets are particularly recommended
with thinner, less viscous materials.
Also, replace the needle packing at
this time. Lightly lubricate the
threads of the fluid tip before reassembling. Torque to 15-20 ft. lbs.
Do not overtighten the fluid tip.
To prevent damage to the fluid tip
(4) or fluid needle (4), be sure to
either 1) pull the trigger and hold
while tightening or loosening the
fluid tip or 2) remove fluid needle
adjusting screw (28) to relieve
spring pressure against needle
collar.
both at the same
Page 2 SB-2-253-I
SAFETY PRECAUTIONS
This manual contains information that is improtant for you to know and understand. This information relates to USER SAFETY
and PREVENTING EQUIPMENT PROBLEMS. To help you recognize this information, we use the following symbols.
Please pay particular attention to these sections.
Note
Important safety information - A hazard
that may cause serious injury or loss
of life.
The following hazards may occur during the normal use of this equipment.
Please read the following chart before using this equipment.
HAZARD CAUSE SAFEGUARDS
Fire
Solvent
Spray
Inhaling Toxic
Substances
Explosion Hazard Incompatible
Materials
General Safety
Cumulative Trauma
Disorders (“CTD’s”)
CTD’s, or musculo- CTD's when using hand tools, tend to affect any such symptoms, see a physician immediately. Other early
skeletal disorders, the upper extremities. Factors which may symptoms may include vague discomfort in the hand, loss of
involve damage to increase therisk of developing a CTD include: manual dexterity, and nonspecific pain in the arm. Ignoring early
the hands, wrist, symptoms and continued repetitive use of the arm, wrist and
elbows, shoulders, 1. High frequency of the activity. hand can lead to serious disability. Risk is reduced by avoiding
neck and back. Carpal 2. Excessive force, such as gripping, pinching, or lessening factors 1-7.
tunnel syndrome and or pressing with the hands and fingers.
tendinitis (such as 3. Extreme or awkward finger, wrist, or arm
tennis elbow or positions.
rotator cuff 4. Excessive duration of the activity.
syndrome) are 5. Tool vibration.
examples of CTD’s. 6. Repeated pressure on a body part.
Solvent and coatings can be highly flammable Adequate exhaust must be provided to keep air free of
or combustible especially when sprayed. accumulations of flammable vapors.
During use and while cleaning and flushing, Wear eye protection.
solvents can be forcefully expelled from fluid
and air passages. Some solvents can cause
eye injury.
Certain materials may be harmful if inhaled, or Follow the requirements of the Material Safety Data Sheet
if there is contact with the skin. supplied by your coating material manufacturer.
Halogenated hydrocarbon solvents - for Guns with stainless steel internal passageways may be used
example; methylene chloride and 1, 1, 1 - with these solvents. However, aluminum is widely used in other
Trichloroethane are not chemically compatible spray application equipment - such as material pumps, regulawith the aluminum that might be used in many tors, valves and cups. Check all equipment items before use and
system components. The chemical reaction make sure they can also be used safely with these solvents. Read
caused by these solvents reacting with the label or data sheet for the material you intend to spray. If in
aluminum can become violent and lead to doubt as to whether or not a coating or cleaning material is
an equipment explosion. compatible, contact your material supplier.
Improper operation or maintenance of Operators should be given adequate training in the safe use and
equipment. maintenance of the equipment (in accordance with the require-
Use of hand tools may cause cumulative Pain, tingling, or numbness in the shoulder, forearm, wrist,
trauma disorders (“CTD’s”). hands or fingers, especially during the night, may be early
7. Working in cold temperatures.
CTD’s can also be caused by such activities
as sewing, golf, tennis bowling, to name a few.
Important information that tells how
to prevent damage to equipment, or
how to avoid a situation that may
cause minor inury.
Smoking must never be allowed in the spray area.
Fire extinguishing equipment must be present in the spray area.
Adequate exhaust must be provided to keep the air free of
accumulations of toxic materials.
Use a mask or respirator whenever there is a chanced of inhaling
sprayed materials. The mask must be compatible with the
material being sprayed and its concentration. Equipment must be
as prescribed by an industrial hygienist or safety expert, and be
NIOSH approved.
ments of NFPA-33, Chapter 15). Users must comply with all local
and national codes of practice and insurance company require
ments governing ventilation, fire precautions, operation, maintenance and housekeeping. These are OSHA Sections 1910.94
and 1910.107 and NFPA-33.
symptoms of a CTD. Do not ignore them. Should you experience
Information that you should pay special
attention to.
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