GravityGun
HVLP PAINT SPRAY SYSTEM
User ’ s
Manual
Gravity Gun
GG-100
Smith Eastern Corporation
10630-S Riggs Hill Road • Jessup, Maryland 20794-9425 USA
301.497.7600 • 800.937.HVLP (4857) • Fax 301.497.7613
gravity@airverter.com • www.airverter.com
Compliance • Quality • Performance • Reliability
© 2000 Smith Eastern Corporation
AirVerter® Gravity Gun HVLP Paint Spray System
DO NOT OPERATE SPRAY GUNS WITHOUT PERSONAL SAFETY EQUIPMENT
AirVerter® Gravity Gun HVLP Paint Spray System
Please Read This Owner’s Manual BEFORE
Using Your Gravity Gun
DO NOT OPERATE THIS EQUIPMENT WITHOUT USING PROPER
PERSONAL SAFETY EQUIPMENT INCLUDING RESPIRATOR, GOGGLES
AND SAFETY CLOTHING. OBSERVE ALL PRECAUTIONS RELATED TO
SPRAYING.
WARNING
THIS EQUIPMENT IS OPERATED USING PRESSURIZED AIR. ALWAYS
DISCONNECT SPRAY GUN FROM AIR AND FLUID HOSES AND
DEPRESSURIZE SYSTEM PRIOR TO ANY MAINTENANCE OR
DISASSEMBLY PROCEDURE.
WARRANTY
Smith Eastern Corporation warrants to the Purchaser that the GG-100 Gravity Gun is free from
defects in material or workmanship under normal use and service for a period of twelve (12) months
from the date of purchase. Should any failure appear during this period, Smith Eastern shall, if
given prompt written notice by the Purchaser, correct such nonconformity by repair or replacement
of the nonconforming part, F.O.B. Smith Eastern’s repair facility. Repair parts are warranted for
ninety (90) days from the date of shipment, but repairs or replacements to original equipment shall
not renew or extend the warranty period of such equipment. Equipment and parts furnished by
Smith Eastern but manufactured by others shall be limited to the warranty offered by the
manufacturer thereof.
Smith Eastern reserves the right to limit this warranty in cases of misuse or abuse. Any
modifications to spray guns or recommended procedures will void the warranty.
The foregoing warranty is exclusive and in lieu of other warranties of quality or performance,
expressed, implied or statutory, including any warranties of merchantability or of fitness for a
particular purpose.
Why Airverter Spray Gun Systems Work Better
To accomplish effective atomization of a liquid at low pressure (below 10 PSI) it is necessary to
substantially decrease pressure (PSI) and increase air volume (CFM). AirVerter® systems, by design, do
not exceed 10 PSI at the spray head and prevent the operator from taking AirVerter® spray guns out of
compliance with EPA and California’s South Coast Air Quality Management District (SCAQMD)
regulations.
DO NOT OPERATE SPRAY GUNS WITHOUT PERSONAL SAFETY EQUIPMENT
AirVerter® Gravity Gun HVLP Paint Spray System
EQUIPMENT REQUIREMENTS
Air Compressor
High Pressure Air Hose
®
Air compressors used with AirVerter Spray Guns
must be able to HOLD a minimum of 40 PSI while
spraying. Note: Position a pressure gauge in the
air hose nearest the spray gun to be assured of
the PSI required to satisfactorily spray your
coating.
A. Air hose lengths up to 50 feet MUST have an
I.D. of 3/8" including fittings.
B. Air hose lengths greater than 50 feet MUST
have an I.D. of 1/2" including fittings.
OPERATING INSTRUCTIONS
OPERATION:
Starting:
A. The Gravity Gun GG-100 Spray Gun operates
with the trigger controlling both the fluid flow
and air flow.
B. Consult the Needle, Nozzle and Air Cap
Selection Guide to select the proper
combination for the coating and finish
quality desired. Too much pressure will
create unnecessary overspray!
Before Spraying
A. Follow the Air and Paint Management
Guidelines listed on the following page.
B. Before paint is poured into the cup, make
certain paint is properly mixed. This is
particularly true when mixing multi-component
paints. Use a paint shaker, rotary mixer, or
paint paddle to achieve a homogeneous
mixture. (Hint: Split your paint into two parts;
the top will be lighter and the bottom will be
heavier. Completely stir the bottom half of the
paint and slowly add small amounts of the top
half into the heavier bottom.)
C. Strain your paint to remove impurities.
Use a cone strainer or a 100-mesh nylon bag
or equivalent strainer.
D. Thin your paint according to the
manufacturer’s specifications.
E. Ensure needle packings are properly
adjusted. Needle packings are preset at the
factory to proper tension. However, use and
cleaning may alter this setting. To adjust
needle packings to proper tension:
1. With gun disconnected from air and fluid
sources, pull trigger to move the needle out
of the nozzle.
2. Adjust packing nut until needle is held in
the open position by tension from the
needle packings.
3. Loosen packing nut approximately ¼ turn or
until needle returns to closed position.
4. Connect air supply hose to the Air Inlet
Fitting (GG-027) at handle of gun.
5. The Air Control Valve (GG-026) in the gun
handle can be used to adjust gun inlet
pressure
6. Screw the Paint Cup (GG-031) onto the
Fluid Inlet Fitting (GG-011)
Spraying
A. Gravity forces paint from the paint container
into the fluid chamber of the gun and out
through the nozzle where the flow of
atomizing air breaks the paint stream into tiny
particles, creating the spray.
1. Needle position controls the amount of paint
flowing through the fluid nozzle.
2. Trigger action controls needle position.
3. The Fluid Control Knob (GG-015) at the rear
of the spray gun controls trigger action.
Turning the knob to the right reduces the
fluid flow, turning it to the left increases the
flow.
B. Adjust the pattern by turning the Fan Control
Assembly (GG-013) at the rear of the Spray
Gun.
1. Round Pattern - used to draw fine lines with
the gun close to the work, for touch-up
work, camouflage patterns and painting
surfaces in difficult to reach places distant
from the spray gun.
This pattern is
achieved by turning the Fan Control Knob
clockwise
2. Full Fan Pattern - used with the spray gun
6"-8" from the work. Overlap not more than
DO NOT OPERATE SPRAY GUNS WITHOUT PERSONAL SAFETY EQUIPMENT
AirVerter® Gravity Gun HVLP Paint Spray System
50% of the previous pass. Do not “fog”
coat. This pattern is achieved by turning the
Fan Control Knob counterclockwise.
3. The full fan pattern may be reduced in size
by gradually turning the Fan Control Knob
clockwise. Fluid flow must be reduced at
the same time to maintain even paint
distribution.
C. If you are having problems with the operation
of your paint gun, check the Trouble Shooting
Guide at the end of the manual for possible
causes and solutions.
Air and Paint Management Guidelines
Approximate PSI
Application
Thin Coatings
Machines and implements, small parts, plant maintenance,
controlled production work, work in enclosed areas with
poor ventilation, priming.
ZAHN #2 Test: 16 to 22 seconds
Minimum 40 PSI compressor pressure
Thin to Medium Coatings
ZAHN #2 Test: 22 to 30 seconds
40 to 60 PSI compressor pressure
High Solid Coatings
ZAHN #3 Test: 37 + seconds
50 to 70 PSI compressor pressure
80% Solids Coatings
60 to 80 PSI compressor pressure
Dual gun work for all of the above listed applications - will
support up to 50' of 3/8" ID hose for each gun. Also for
higher production levels of all of the above.
Marine epoxies, marine enamels, high production
steelwork, high production with conveyer lines, large
surfaces with thinner viscosity material, latex on wood or
metal.
Ultra high production levels on extremely large surfaces;
un-thinned epoxies, enamels, latex, urethane.
WARNING
Gun must be de-pressurized prior to any maintenance or disassembly
procedure. Disconnect all air hoses prior to performing any maintenance
operation.
Cleaning the Gravity Gun
Cleaning and Gun Care
A. Remove the Air Cap and Ring and clean with
solvent.
B. Flush gun thoroughly with solvent.
C. Clean nozzle with brush. Never place the
whole gun in solvent.
D. Clogged holes should never be cleaned with
hard objects as the smallest amount of
damage may badly influence the spray
pattern.
E. Packing must be slightly lubricated after
cleaning of gun.
Spray Gun Performance Is Directly Related To
How Well The Gun Is Cleaned After Use
DO NOT OPERATE SPRAY GUNS WITHOUT PERSONAL SAFETY EQUIPMENT
AirVerter® Gravity Gun HVLP Paint Spray System
Lubricate
A. Use Vaseline or a non-silicone grease to
lubricate the gun.
B. Lubricate all threaded connections for ease
of maintenance.
C. Lubricate the Needle only where it passes
through the needle packings.
D. DO NOT allow lubricant to get into the Fluid
Tube, Nozzle, Air Cap, or interior of the paint
chamber (areas where paint may come in
contact with lubricant).
Gun Head Disassembly and Re-assembly Instructions
(Note: Gun Head disassembly is not recommended for normal cleaning and maintenance.)
Gun Head Disassembly
Gun Head Re-assembly
To remove the nozzle carrier and air cap
adapter:
A. Remove the Air Cap (GG-001), Fluid Nozzle
Body (GG-002) and Fluid Needle (GG-014).
B. Remove the Needle Seal Cartridge (GG024).
C. Loosen the Lock Nut (GG-010) on the Fluid
Inlet Fitting (GG-011).
D. Unscrew the Fluid Inlet Fitting from the gun
E. The Nozzle Carrier (GG-005) and Air Cap
Adapter (GG-006) will now slide forward
from the Gun Handle (GG-012). Note: a
seal will remain in the gun body and should
not be removed. The Copper Gasket and
Lower Seal should be replaced.
A. Thread the Lock Nut back against the hex
on the Fluid Inlet Fitting. Slide seal onto the
Fluid Inlet Fitting. Thread the copper gasket
onto the Fluid Inlet Fitting.
B. Install O-ring onto the Air Cap Adapter.
C. Slide the Nozzle Carrier into the Air Cap
Adapter and rotate until the inlet port in the
Nozzle Carrier is aligned with the hole in the
Air Cap Adapter; the two will lock together in
this position.
D. Holding the Nozzle Carrier and Air Cap
Adapter together in the position described,
slide them into the gun head and rotate until
the locating pin is aligned with the slot in the
Gun Body and slide further into the Gun
Body.
E. Install the Needle Seal Cartridge and tighten
to approx. 150-175 in-lb. torque.
F. Install the Fluid Inlet Fitting and tighten to
approx. 175 in-lb. torque. Tighten the Lock
Nut against the Gun Body.
GG-011
GG-010
Upper Seal
GG-012
Lower Seal
Copper Gasket
GG-006
GG-005
O-ring
GG-024
DO NOT OPERATE SPRAY GUNS WITHOUT PERSONAL SAFETY EQUIPMENT
AirVerter® Gravity Gun HVLP Paint Spray System
Gravity Gun Illustrated Parts Breakdown
DO NOT OPERATE SPRAY GUNS WITHOUT PERSONAL SAFETY EQUIPMENT
AirVerter® Gravity Gun HVLP Paint Spray System
Gravity Gun Parts List
1&2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Part #
GG-001-xx
GG-003-xx
GG-002
GG-005
GG-006
Note 1
Note 1
Note 1
GG-010
GG-011
GG-012
GG-013
GG-014-xx
GG-015
Note 1
Note 1
GG-018
Note 1
GG-020
GG-021
Note 1
Note 1
GG-024
GG-025
GG-026
GG-027
GG-028
GG-030
GG-029
NSN
Description
4940-01-481-0571 Air Cap with Ring
Fluid Nozzle Tip
Fluid Nozzle Body
Nozzle Carrier
Air Cap Adapter
O-Ring
O-Ring
Seal
Lock Nut
Fluid Inlet Fitting
Gun Body HVLP
Fan Control Assembly
Fluid Needle
Fluid Control Knob
Spring Seat
Needle Return Spring
Rear Bushing
Seal
Air Valve Assembly
Air Valve Poppet
O-Ring
Air Valve Spring
Needle Seal Cartridge
Trigger
Air Control
Air Inlet Fitting
Trigger Pivot Set
Allen Plug
Cup Lid (3 pack for Stainless Steel cup)
Gravity Feed Cup, Aluminum (750 cc) Std.
Note 1: These parts are contained in the High Wear Kit, Part # GG-125
DO NOT OPERATE SPRAY GUNS WITHOUT PERSONAL SAFETY EQUIPMENT
AirVerter® Gravity Gun HVLP Paint Spray System
Needle, Nozzle and Air Cap Selection Guide
Select the proper fluid nozzle and needle for the material to be sprayed. Needle and nozzle are
a matched set - machined to act as a valve. Replace the Needle and Nozzle when the Needle
protrudes approximately 3/32″ beyond the Nozzle.
Needle
Nozzle
Finish
Air
Cap
Compressor
Air Pressure*
Uses or Coating Type
Ultra Fine Finish With Thin Coatings on Small Parts
Ultra Fine Finish
0.7
5
Ultra Fine Touch Up
45- 50
Specialty Applications/Wood Working
Water-Based Lacquers, Urethanes
Automotive Base or Clear Coat
Top Coats For Automotive, Aviation and Marine Use
Excellent Finish
1.0
Good Production
5
Wood: Lacquers, Stains, Polyurethanes, Varnishes
45-55
Thin Specialty Coatings With Low Mil Build and Fine
Finish Requirements
Water-Based Coatings
Higher Production For The Same Applications As
Above
Good Finish
1.2
High Production
10
Fine Finish With Gloss Alkyd Enamel Primers and
Sealers For Automotive, Aviation and Marine
55-65
Water-Based Coatings
General Industrial Finishing
Zinc-Rich Primers, Water-Based Primers, Flat & SemiGloss Alkyd Enamels & Polyurethanes
Excellent Finish
1.4
Good Production
12
Industrial, Marine, Top Coats, Chlorinated Alkyd
Enamels, Acrylic Enamels, and Latex
65-75
Best with Heavy Primers
CARC
High Production
Best Finish
1.7
High Production
17
75-85
Industrial Marine Primers, High Build Primers, Steel
Structures Latex
CARC
Good Finish
2.0
Higher
Production
20
Industrial Finish Coatings
85-90
Latex, Stripper, Oil
*Measured at the gun handle.
Nozzle Size Expressed in Millimeters • 1 Millimeter = .040 (Approximately)
0.7 = .028
1.0 = .040
1.2 = .048
1.4 = .056
1.7 = .067
2.0 = .080
DO NOT OPERATE SPRAY GUNS WITHOUT PERSONAL SAFETY EQUIPMENT
AirVerter® Gravity Gun HVLP Paint Spray System
Gravity Gun Troubleshooting Guide
Trouble
Paint Will Not
Flow
Inconsistent
Spray Pattern
(Spits and
Sputters)
Leakage at
Front of Gun
Distorted
Spray Pattern
Probable Cause
1.
2.
3.
4.
Blockage in fluid nozzle
Loose fluid nozzle
Coating is too thick
Loose needle packing
Remedy
1.
2.
3.
4.
Clean or replace; strain paint
Tighten
Thin the coating
Adjust packing
1. Running out of paint
2. Loose needle packing
1. Fill cup or pot, but never the top ¼
2. Adjust packing
1.
2.
3.
4.
5.
6.
Damaged fluid needle
Wrong size fluid needle
Dirty fluid nozzle
Impurities in paint
Loose fluid nozzle
Fluid adjustment screwed all
the way out
7. Needle not firmly seated in
the nozzle
8. Packing too tight
1.
2.
3.
4.
5.
6.
1. Dirty or damaged air cap
2. Dirty or damaged fluid nozzle
or needle
3. Fluid nozzle partially clogged
4. Fluid nozzle not centered with
air cap
5. Air cap not seated correctly
1. Clean or replace
2. Clean or replace
Replace
Replace
Clean
Strain paint
Tighten
Rotate Fluid Control Knob (GG-015)
on rear of gun clockwise
7. Check for nozzle obstruction
8. Loosen and adjust to correct tension
3. Clean
4. Replace air cap
5. Re-seat air cap
DO NOT OPERATE SPRAY GUNS WITHOUT PERSONAL SAFETY EQUIPMENT
AirVerter® Gravity Gun HVLP Paint Spray System
GG-125 High-Wear Maintenance Kit
For GG-100 Gravity Gun
Part #
NSN #
GG-024
Description
Qty
O-Ring
1
O-Ring
1
Seal
1
Spring Seat
1
Needle Return Spring
1
Seal
1
O-Ring
1
Air Valve Spring
1
Needle Seal Cartridge
1
DO NOT OPERATE SPRAY GUNS WITHOUT PERSONAL SAFETY EQUIPMENT
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