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

Page 4 SB-2-194-K

18

16

17

15

14

13

10

11

12

32

33 34 35

36

6

7

4

2

1

3

5

Fluid Tip

(Torque to

15-20 ft.lbs.)

*26 Air Inlet Nipple

1/4" NPS(M)

9

8

(Torque to 15 ft.lbs.)

Use medium strength thread
sealant (i.e. Devcon #2242
Blue, or equal) on threads

12

19

20

21

23

22

25

24

PARTS LIST

Ind.
Ref. Replacement Parts
No. Part No. Description Req.

1 --- Air Cap 1
2 JGA-156-K10 Spring Clip (Kit of 10) 1
3 GTI-3 Air Cap Retaining Ring 1
4 See Chart 2 Air Cap & Retaining Ring 1
5 See Chart 3 Fluid Tip 1
6 GTI-425 Baffle Assembly 1

•7 GTI-33-K5 Baffle Seal (Kit of 5) 1

•8 JGA-4035-K5 Packing (Kit of 5) 1
9 34411-122-K10 Packing Nut 1
10 GTI-404 Spreader Valve 1
11 GTI-413 Fluid Needle 1

•12 JGS-72-K10 Gasket Kit (PTFE) 2
(Kit of 10)
13 --- Body Bushing 1

•14 --- Fluid Needle Spring 1

•15 --- Spring Pad 1
16 MBD-19-K10 Spring & Pad 1
(Kit of 10)
17 GTI-414 Needle Adjusting Screw 1
18 KK-5059 Bushing, Spring, Pad & 1
Knob Kit

•19 --- Air Valve Spring 1

•20 --- Air Valve 1

37

(Optional)

28

27

29

31

30

Ind.
Ref. Replacement Parts
No. Part No. Description Req.

21 --- Air Valve Body 1

•22 --- U Cup Seal 1

•23 --- Washer 1

•24 --- Snap Ring 1
25 JGS-449-1 Air Valve Assembly 1
26 P-MB-51 Air Inlet Nipple 1
1/4" NPS(M)
27 --- Trigger Stud Screw 1
28 --- Trigger Stud 1
29 JGS-478 Stud and Screw Kit 1
30 --- Trigger 1
31 JGS-477-1 Trigger, Stud, Screw Kit 1

•32 KGP-13-K5 Cup Gasket (Blue) (Kit of 5) 1

•33 --- Retaining Clip 1

•34 --- Seal 1

•35 --- Pin 1
36 GTI-428-K5 Clip, Seal & Pin Kit (5 each) 1
37 GTI-415 Air Adjusting Valve (Optional) 1

• KK-5058-2 Gun Repair Kit includes a quantity of necessary parts.
Sufixes -K5, -K10 designate kits of multiple parts.
Example: JGA-4035-K5 is a kit of 5 packings.

TROUBLESHOOTING
CONDITION CAUSE CORRECTION

SB-2-194-K Page 5

Heavy top or
bottom pattern

Heavy right or left
side pattern

Heavy center pattern

Split spray pattern

Jerky or fluttering spray

Unable to get round spray

Will not spray

Paint bubbles in cup

Fluid leaking or dripping from
cup lid

Starved spray pattern

Excessive overspray

Excessive fog

Dry spray

Fluid leaking from packing nut

Fluid leaking or dripping from
front of gun

*Most common problem.

Horn holes plugged.
Obstruction on top or bottom of fluid tip.
Cap and/or tip seat dirty.

Left or right side horn holes plugged.
Dirt on left or right side of fluid tip.

Remedies for the top-heavy, bottom-heavy, right-heavy, and left-heavy patterns:

1. Determine if the obstruction is on the air cap or the fluid tip. Do this by making a test
spray pattern. Then, rotate the cap one-half turn and spray another pattern. If the defect
is inverted, obstruction is on the air cap. Clean the air cap as previously instructed.

2. If the defect is not inverted, it is on the fluid tip. Check for a fine burr on the edge of the
fluid tip. Remove with #600 wet or dry sand paper.

3. Check for dried paint just inside the opening; remove by washing with solvent.

Fluid flow too high for atomization air.

Material flow exceeds air cap's capacity.
Spreader adjustment valve set too low.
Atomizing pressure too low.
Material too thick.

Atomization air pressure too high.
Fluid flow too low.
Spreader adjusting valve set too high.

*Loose or damaged fluid tip/seat.
Baffle seal installed incorrectly.
Material level too low.
Container tipped too far.
Obstruction in fluid passage.
Dry or loose fluid needle packing nut.

Spreader adjustment screw not seating
properly.
Air cap retaining ring loose.

No air pressure at gun.

Fluid needle adjusting screw not open
enough.
Fluid too heavy for gravity feed.

Fluid tip not tight.

Cup lid loose.
Dirty threads on cup or lid.
Cracked cup or lid.

Inadequate material flow.

Low atomization air pressure.

Too much atomization air pressure.
Gun too far from work surface.
Improper stroking (arcing, gun motion too
fast).

Too much or too fast-drying thinner.
Too much atomization air pressure.

Air pressure too high.
Gun tip too far from work surface.
Gun motion too fast.
Gun out of adjustment.

Packing nut loose.
Packing worn or dry.

Packing nut too tight.
Dry packing.
Fluid tip or needle worn or damaged.
Foreign matter in tip.
Fluid needle spring broken.
Wrong size needle or tip.

Clean. Ream with non-metallic point.
Clean.

Clean.

Clean. Ream with non-metallic point.
Clean.

Balance air pressure and fluid flow. Increase
spray pattern width with spreader adjustment
valve.
Thin or lower fluid flow.
Adjust.
Increase pressure.
Thin to proper consistency.

Reduce at transformer or gun.
Increase fluid flow (increases gun handling
speed).
Adjust.

Tighten or replace.
Install per directions.
Refill.
Hold more upright.
Backflush with solvent.
Lubricate or tighten.

Clean or replace.

Tighten.

Check air supply and air lines, blow out gun
air passages.
Open fluid needle adjusting screw.

Thin material and/or change to larger tip size.

Tighten tip to 15-20 ft-lbs.

Push in or tighten lid.
Clean.
Replace cup and lid.

Back fluid adjusting screw out to first thread,
or change to larger tip size.
Increase air pressure and rebalance gun.

Reduce pressure.
Adjust to proper distance.
Move at moderate pace, parallel to work
surface.

Remix properly.
Reduce pressure.

Reduce air pressure.
Adjust to proper distance.
Slow down.
Adjust.

Tighten, do not bind needle.
Replace or lubricate.

Adjust.
Lubricate.
Replace tip and needle.
Clean.
Replace.
Replace.

Page 6 SB-2-194-K

TROUBLESHOOTING (continued)

CONDITION CAUSE CORRECTION

Fluid dripping or leaking from
bottom of cup

Runs and sags

Thin, sandy coarse finish drying
before it flows out

Cup loose on gun.
Cup gasket worn or missing below cup.
Cup threads dirty.

Too much material flow.
Material too thin.
Gun tilted on an angle, or gun
motion too slow.

Gun too far from surface.
Too much air pressure.
Improper thinner being used.

Tighten.
Replace cup gasket.
Clean.

Adjust gun or reduce fluid flow.
Mix properly or apply light coats.
Hold gun at right angle to work and
adapt to proper gun technique.

Check distance. Normally approx. 8".
Reduce air pressure and check spray pattern.
Follow paint manufacturer's mixing instructions.

Thick, dimpled finish "orange peel"

Gun too close to surface.

Air pressure too low.
Improper thinner being used.
Material not properly mixed.
Surface rough, oily, dirty.

Check distance. Normally approx. 8".
Too much material coarsely atomized.
Increase air pressure or reduce fluid flow.

Follow paint manufacturer's mixing instructions.
Properly clean and prepare.

ACCESSORIES

GFC-501 (Acetal) 20 oz.

702576 (Aluminum) 900 cc

Gravity Feed Cups

These gravity feed cups are
designed to be used with FLG,
GFG, GFHV or GTI gravity feed

spray guns.

HAV-500 OR

HAV-511

Adjusting Valve

(HAV-511 SHOWN)

HARG-510

Air Regulator

SB-2-194-K Page 7

192219

Gun Holder

GH-505 Gun Holder

Automotive Quick Connects (Air)

High Flow Type.

HC-4419 Stem

1/4" NPT(F)

HC-1166 Stem

1/4" NPT(M)

OMX-70-K48 Paint Cup Liner Kit

Allows quick & easy clean-up.

Consists of : 1 - Piercing Tool, 48 - Disposable
Liners, 48 - Drain Bushings

HC-4719 Coupler

1/4" NPT(M) /NPS(M)

HC-4720 Coupler

1/4" NPT(F)

Spray Gun Lube

SSL-10 (2 oz. bottle)

Compatible with all paint materials;
contains no silicone or petroleum
distillates to contaminate paint. MSDS
Sheet available upon request.

HAV-500 does not
have pressure gauge.
Use to control air
usage at gun.

Use to maintain nearly
constant outlet pressure
despite changes in in­let pressure and down­stream flow.

WR-103 Wrench

Contains all necessary
tip, hose and nut sizes
used on or with gun.

40-128 Twin Cartridge,
Paint Spray Respirator

NIOSH-Certified
(TC84A-1623) for respiratory
protection in atmospheres not
immediately dangerous to life.

HAF-507 Whirlwind™

In-Line Air Filter

Removes water, oil, and debris
from the air line.

Gun holder made
to hold guns with
gravity cups.

Gun holders are made
to hold standard paint
cups, gravity feed
guns and cups, and
paint filters.

192218 Scrubs®

Hand Cleaner Towels

Scrubs® are a pre-moist­ened hand cleaner towel
for painters, body men
and mechanics that go
where you go and no
water is needed.

192212 Professional Spray Gun

Cleaning Kit

Contains six preci­sion tools designed
to effectively clean
all DeVilbiss, Binks,
Finishline and other
brand spray guns.

Page 8 SB-2-194-K

WARRANTY

This product is covered by DeVilbiss' 1 Year Limited Warranty.

DeVilbiss Sales and Service: www.devilbiss.com

DeVilbiss Automotive Refinishing

DeVilbiss has authorized distributors throughout the world.
For equipment, parts and service, check the Yellow Pages
under “Automotive Body Shop Equipment and Supplies.”
For technical assistance, see listing below.

U.S.A./ Canada Customer Service Office:
11360 S. Airfield Road, Swanton, OH 43558
Toll-Free Telephone: [phone] (U.S.A. and Canada only)
Toll-Free Fax: [phone]

6/14 © 2014 DeVilbiss Automotive Refinishing All rights reserved. Printed in U.S.A.