DeVilbiss GFG-670 PLUS Service Bulletin

SERVICE BULLETIN

SB-2-194-K

Replaces SB-2-194-J

Repair Kit KK-5058-2

GFG-670 PLUS® HIGH EFFICIENCY GRAVITY FEED SPRAY GUN

IMPORTANT: Before using this equipment,
read all safety precautions and instructions.
Keep for future use.

DESCRIPTION

®

The standard Plus
purpose, heavy-duty, high production
gravity spray gun suitable for use with most
types of materials.

This gun includes 300 series stain­less steel fluid tip and needle. The
fluid passageway is plated alumi­num. Guns may be used with chlori ­nated solvent materials only if the
attached gravity cup is Acetal or
Nylon. Do not use aluminum cups

with chlorinated solvent materials.

Important: This gun may be used with most

common coating and finishing materials.
It is 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).

Depending on hose length, larger
I.D. hose may be required. Do not

use more pressure than is neces­sary to atomize the material being
applied. Excess pressure will create

additional overspray and reduce
transfer efficiency.

spray gun is a general

NOTE

NOTE

NOTE

If an air adjusting valve is used at the
gun inlet, use DeVilbiss Model HAV­500 or HAV-511. Some competitive
adjusting valves have significant
pressure drop that can adversely
affect spray performance. Models
HAV-500 and HAV-511 have minimal
pressure drop.

2. Attach the gravity feed cup 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 gravity feed cup with the mate­rial. Do not overfill. Make sure that the
cup lid vent hole is clear.

2. Open the spreader adjustment valve
(10) (Fan) by turning the valve stem
counterclockwise.

3. Close the fluid needle adjusting screw
(17) by turning clockwise.

4. Turn on air supply. See Chart 1
for recommended inlet pressure.
Some materials can be sprayed at
lower pressures, improving transfer
efficiency.

5. Spray a test area by turning fluid needle
adjusting screw (17) counterclockwise
until a full coat is obtained.

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 spreader
adjustment valve (10), either clockwise to
decrease the width or counterclockwise to
increase the width.

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 instrument is
used, extreme care must be used to prevent
scratching or burring of the holes which will
cause 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 3.
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 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.

TRANSFER EFFICIENCY

®

The DeVilbiss GFG-670 (110264) PLUS
Gravity feed spray gun, when tested
under recommended conditions with
automotive refinishing materials, has been
found to exceed 65% transfer efficiency.

Page 2 SB-2-194-K

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 hygienist 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.

CA PROP

65

Information that you should pay special
attention to.

PROP 65 WARNING

WARNING: This product contains chemicals
known to the State of California to cause
cancer and birth defects or other
reproductive harm.

SB-2-194-K Page 3

SPRAY GUN LUBRICATION

Daily, apply a drop of SSL-10* spray gun
lube at trigger bearing stud (28) and the
stem of air valve (20) where it enters air valve
assembly. The shank of fluid needle (11)
where it enters packing nut (9) should also
be oiled. Fluid needle packing (8) should be
lubricated periodically. Make sure baffle (6)
and retaining ring (3) threads are clean and
free of foreign matter. Before assembling
retaining ring to baffle, clean the threads
thoroughly, then add two drops of SSL-10
spray gun lube to threads. Fluid needle
spring (14) and air valve spring (19) should
be coated with a very light grease, making
sure that any excess grease will not clog
the air passages. For best results, lubricate
the points indicated, daily.
*Not for air tools or high RPM equipment.

A. Trigger Points
B. Packing
C. Adjusting Knobs
D. Baffle Threads
E. Air Valve Cartridge

A

D

Chart 1

Order No. Model No. (mm) Pressure Applications

110264 GFG-670* 1.2 & 1.3 25-35 psi Base coats
30-40 psi High solids clearcoats
30-40 psi Single stages
25-30 psi Waterbornes

1.4 30-40 psi Low solids clear coats
30-40 psi Single stages

*Includes 1.2 mm, 1.3 mm and 1.4 mm fluid tips

Fluid Tip Inlet Air

C

E

PARTS REPLACEMENT
Figure 1 Air Cap

410

DeVilbiss

JGA-4035 Packing Replacement Instruc­tions

Gun Body

1. Remove adjusting knob and needle
spring from gun.

2. Partially withdraw needle from gun
body.

3. Loosen packing nut and remove.

4. Remove old packing.

5. Assemble packing nut to needle

6. Assemble packing in order shown to
needle.

7. Insert needle all the way into gun
body seating in tip.

B

8. Install needle spring and adjusting
knob.

9. Thread packing nut into gun body.

10. Tighten packing nut in equal
increments - no more than 1/6 turn
at a time.

11. After each adjustment, pull needle
open and observe needle closure.

12. If needle snaps shut, continue
adjusting nut until there is evidence
of needle bind or slow closing.

13. Back off packing nut 1/12 turn to the
point where needle snaps shut.
Packing nut must remain tight
enough to prevent loosening by
hand.

14. Pull needle several times to verify
needle snaps shut and check
packing nut for looseness.

Packing
(3 pieces)

Air Cap No.

Needle

Packing

Nut

Chart 2

No. on Air Cap Air Flow (CFM)
Air Cap With Ring @30 @40 @50
Order ➔ (Ref. No. 4) psi psi psi

410 AV-440-410 9.1 11.2 13.2

Chart 3

Fluid Tip Size I.D.

Tip No. In. mm

AV-213-10 0.039 1.0
AV-213-12 0.047 1.2
AV-213-13 0.051 1.3
AV-213-14 0.055 1.4
AV-213-16 0.063 1.6
AV-213-18 0.070 1.8

GTI-33 Baffle Seal Replacement

1. Remove Fluid Tip (5).

2. Remove baffle (6).

3. Remove Seal (7) from baffle.

NOTE

The seal is designed to be a tight
fit on the baffle. The seal should
be able to be removed using your
fingers. If you are unable to remove
the seal using your fingers, insert
a small screwdriver between the
outer lip and the back of the baffle
and pry the seal off.

ANGLED SIDE

SEAL

THICK SIDE

Pry here if
necessary

4. Assemble seal to baffle with angled side
up as shown above. NOTE: The seal

should be a tight fit on the baffle. If it is a
loose fit on the baffle, assure that it is
assembled with the angled side up.

5. Install baffle on gun.

6. Install fluid tip (5) and tighten to
15-20 ft-lbs.

BAFFLE