DeVilbiss GTI-500P, GTI-520P, EXL-520P Service Bulletin
SERVICE BULLETIN
SB-2-193-G
Replaces SB-2-193-F
Repair Kit KK-5058-2
GTI-500P and GTI-520P COMPLIANT PRESSURE FEED HVLP SPRAY GUNS
IMPORTANT: Before using this equipment,
read all safety precautions and instructions.
Keep for future use.
DESCRIPTION
These pressure feed high volume low pressure GTI guns are designed to apply a wide
variety of finishing materials. These guns
are manufactured to provide maximum
transfer efficiency by limiting air cap pres-
sure to 10 psi (complies with rules issued by
SCAQMD and other air quality authorities).
These guns will produce approximately 10
psi cap pressure at 30 psi gun inlet pressure. Air cap test kits are available (see
ACCESSORIES) which can be utilized to set
the exact air cap pressure. Air consumption
for the GTI-500P (#100 cap) is 16 SCFM
at 10 psi air cap pressure. Air consumption
for the GTI-520P (#2000 cap) is 15.5 SCFM
at 10 psi air cap pressure.
NOTE
These guns include 400 series
stainless steel fluid tips and
needles. Guns may be used with
chlorinated solvent materials. See
page 2 for additional warnings.
Important: These guns may be used with
most common coating and finishing materials. They are designed for use with mildly
corrosive and non-abrasive 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
For maximum transfer efficiency, do not
use more pressure than is necessary to
atomize the material being applied.
1. Connect the gun to a clean, moisture
and oil free air supply using a hose size
of at least 5/16" I.D. hose. Do not use
1/4" I.D. hose (25' x 1/4" hose at 18 CFM
has a pressure loss of 25 psi. 25' x 5/16"
hose at 18 CFM has a pressure loss of
8 psi).
NOTE
Depending on hose length, larger I.D.
hose may be required. Install an
HAV-501 air gauge at the gun handle
and air cap test kit over tip. When
gun is triggered on, adjust regulated
pressure to desired setting to provide
a maximum of 10 psi at the air cap.
Do not use more pressure than is
necessary to atomize the material
being applied. Excess pressure will
create additional overspray and reduce transfer efficiency.
NOTE
If quick connects are required, use
only high flow quick connects approved for HVLP use such as DeVilbiss HC-4419 and HC-4719. Other
types will not flow enough air for
proper gun operation.
NOTE
If an air adjusting valve is used at the
gun inlet, use DeVilbiss Model HAV500 or HAV-501. Some competitive
adjusting valves have significant
pressure drop that can adversely
affect spray performance. Models
HAV-500 and HAV-501 have minimal
pressure drop, which is important for
HVLP spraying.
2. Attach the 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 maufacturer's
instructions.
Strain material through a 60 or 90 mesh
screen.
1. Fill the pressure tank with the material.
2. Open the spreader adjustment valve
(10) (Fan) by turning the valve stem
counterclockwise.
3. Open fluid adjusting screw (17) by turning counterclockwise.
4. Turn on air supply to gun and pressure
tank and set gun inlet pressure to
lowest recommended pressure for material being sprayed. Spray a test area.
Air pressure and paint flow should be
adjusted to provide a uniform dispersion of atomized paint throughout the
pattern. Due to the unique cone shape
of the AV-2120 fluid tip, a slight back
pressure is created against the fluid
column. This will reduce the amount
of fluid output. To compensate, increase the fluid regulator pressure
slightly. With 10 psi cap pressure, back
pressure is approximately 2.0 psi. Keep
air pressure as low as possible to minimize bounce-back and overspray. Excessive fluid flow will result in heavy
center spray patterns. Inadequate flows
may cause the patterrn to split. See
TROUBLESHOOTING, Page 5, if any
problems occur. If finer atomization is
required, increase gun inlet pressure.
If a reduced fluid flow rate is required,
turn fluid adjusting screw (17) clockwise until desired fluid flow is obtained.
See Spray Gun Guide, SB-2-001 latest
revision, for details concerning setup of
spray guns.
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 if possible. If a wire or hard instru-
ment is used, extreme care must be used to
prevent scratching or burring of the holes
which will cauase a distorted spray pattern.
To clean fluid passages, remove excess
material from cup, then flush with a suitable
solvent. 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 both at the same
time. Using worn parts can cause
fluid leakage. See Chart 2. Also,
replace the needle packing at this
time. Lightly lubricate the threads
of the fluid tip before reassembling. Torque to 12-15 ft. lbs. Do
not overtighten the fluid tip.
To prevent damage to fluid tip (5)
or fluid needle (11), be sure to
either 1) pull the trigger and hold
while tightening or loosening the
fluid tip, or 2) remove fluid needle
adjusting screw (17) to relieve
spring pressure against needle
collar.
Page 2 SB-2-193-G
SAFETY PRECAUTIONS
This manual contains information that is important 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 information that tells how to
Important safety information - A hazard
that may cause serious injury or loss of life.
prevent damage to equipment, or how to
avoid a situation that may cause minor
injury.
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 musculoskeletal
disorders, involve damage
to the hands, wrists,
elbows, shoulders, neck,
and back. Carpal tunnel
syndrome and tendonitis
(such as tennis elbow or
rotator cuff syndrome) are
examples of CTD's.
Solvent and coatings can be highly
flammable or combustible especially when
sprayed.
During use and while cleaning and flushing,
solvents can be forcefully expelled from
fluid and air passages. Some solvents can
cause eye injury.
Certain materials may be harmful if inhaled,
or if there is contact with the skin.
Halogenated hydrocarbon solvents - for
example; methylene chloride and 1,1,1, Trichloroethane are not chemically
compatible with the aluminum that might be
used in many system components. The
chemical reaction caused by these solvents
reacting with aluminum can become violent
and lead to an equipment explosion.
Improper operation or maintenance of
equipment.
Use of hand tools may cause cumulative
trauma disorders ("CTD's").
CTD's, when using hand tools, tend to affect
the upper extremities. Factors which may
increase the risk of developing a CTD include:
1. High frequency of the activity.
2. Excessive force, such as gripping,
pinching, or pressing with the hands and
fingers.
3. Extreme or awkward finger, wrist, or arm
positions.
4. Excessive duration of the activity.
5. Tool vibration.
6. Repeated pressure on a body part.
7. Working in cold temperatures.
CTD's can also be caused by such activities
as sewing, golf, tennis, and bowling, to name
a few.
Adequate exhaust must be provided to keep air free of
accumulations of flammable vapors.
Smoking must never be allowed in the spray area.
Fire extinguishing equipment must be present in the spray area.
Wear eye protection.
Follow the requirements of the Material Safety Data Sheet
supplied by your coating material manufacturer.
Adequate exhaust must be provided to keep the air free of
accumulations of toxic materials.
Use a mask or respirator whenever there is a chance 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 hygienst or safety expert, and be
NIOSH approved.
Guns with stainless steel internal passageways may be used with
these solvents. However, aluminum is widely used in other spray
application equipment - such as material pumps, regulators,
valves, and cups. Check all equipment items before use and make
sure they can also be used safely with these solvents. Read the
label or data sheet for the material you intend to spray. If in doubt
as to whether or not a coating or cleaning material is compatible,
contact your material supplier.
Operators should be given adequate training in the safe use and
maintenance of the equipment (in accordance with the requirements of NFPA-33, Chapter 15). Users must comply with all local
and national codes of practice and insurance company
requirements governing ventilation, fire precautions, operation,
maintenance, and housekeeping. These are OSHA Sections
1910.94 and 1910.107 and NFPA-33.
Pain, tingling, or numbness in the shoulder, forearm, wrist, hands,
or fingers, especially during the night, may be early symptoms of
a CTD. Do not ignore them. Should you experience any such
symptoms, see a physician immediately. Other early symptoms
may include vague discomfort in the hand, loss of manual
dexterity, and nonspecific pain in the arm. Ignoring early
symptoms and continued repetitive use of the arm, wrist, and
hand can lead to serious disability. Risk is reduced by avoiding
or lessening factors 1-7.
Information that you should pay special
attention to.
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