Page 1
LVLP SPRAY GUN
Model
92841
SET UP AND OPERATING INSTRUCTIONS
Visit our website at: http://www.harborfreight.com
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright© 2005 by Harbor Freight Tools®. All rights reserved. No portion of this manual or any
artwork contained herein may be reproduced in any shape or form without the express written
consent of Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally.
Due to continuing improvements, actual product may differ slightly from the product described
herein. Tools required for assembly and service may not be included.
For technical questions or replacement parts, please call 1-800-444-3353.
Manual Revised 09k
Page 2
SPECIFICATIONS
Operating Pressure
Continuous Air
Consumption
Recommended Hose
Diameter
Net Weight 1.7 lb.
Body Construction
Valve Construction Zinc Plated Brass
Air Inlet 1/4” NPS
Overall Dimensions
NOTE: This is a LVLP (Low Volume Low
Pressure) spray gun.
20 - 45 PSI,
50 PSI max.
5.5 to 9 SCFM
1/4” I.D.
Cast Aluminum with
Aluminum Cup
10-1/2”H x 7-1/2”L x
4-1/4”W
electrically powered compressors in
the presence of ammable gases or
liquids.
Keep children away3. . Children must
never be allowed in the work area.
Do not let them handle air lines,
machines, tools, or extension cords.
Store idle equipment4. . When not
in use, tools must be stored in a dry
location to inhibit rust. Always lock
up tools and keep out of reach of
children.
Use the right tool for the job5. . Do
not attempt to force a small tool or
attachment to do the work of a larger
industrial tool. There are certain
SAVE THIS MANUAL
You will need the manual for
the safety warnings and precautions,
assembly instructions, operating and
maintenance procedures, parts list and
diagram. Keep your invoice with this
manual. Write the invoice number on the
inside of the front cover. Keep the manual
and invoice in a safe and dry place for
future reference.
applications for which this tool was
designed. It will do the job better and
more safely at the rate for which it
was intended. Do not modify this tool
and do not use this tool for a purpose
for which it was not intended.
Dress properly6. . Protective,
electrically non-conductive
clothes and non-skid footwear are
recommended when working. Wear
restrictive hair covering to contain
SAFETY WARNINGS AND
PRECAUTIONS
long hair.
Use eye protection7. . Always wear
ANSI approved impact safety
WARNING: When using tool, basic
safety precautions should always
be followed to reduce the risk of
personal injury and damage to
goggles. Wear an ANSI approved
dust mask and respirator when
working around paint spray, chemical
dusts and mists.
equipment.
Do not overreach8. . Keep proper
Read all instructions before using this
tool!
Keep work area clean1. . Cluttered
areas invite injuries.
Observe work area conditions2. .
Do not use this sprayer in damp or
wet locations. Don’t expose to rain.
Keep work area well lit. Do not use
footing and balance at all times. Do
not reach over or across running
machines.
Maintain tools with care9. . Keep
tools maintained and clean for better
and safer performance. Follow
instructions for lubricating and
changing accessories. Inspect tool
REV 05d
Page 2 For technical questions, please call 1-800-444-3353. SKU 92841
Page 3
cords periodically and, if damaged,
have them repaired by a qualied
technician. The handle must be kept
clean, dry, and free from oil and
grease at all times.
Disconnect power10. . Disconnect tool
from air supply when not in use.
Remove adjusting keys and 11.
wrenches. Check that keys and
adjusting wrenches are removed
from the tool or machine work surface
before plugging it in.
Stay alert12. . Watch what you are
doing, use common sense. Do not
operate any tool when you are tired.
Check for damaged parts13. . Before
using any tool, any part that appears
damaged should be carefully checked
to determine that it will operate
properly and perform its intended
function. Check for alignment and
binding of moving parts; any broken
parts or mounting xtures; and any
other condition that may affect proper
operation. Any part that is damaged
should be properly repaired or
replaced by a qualied technician. Do
not use the tool if the trigger does not
operate properly.
WARNING: The brass components 16.
of this product contain lead, a
chemical known to the State of
California to cause birth defects
(or other reproductive harm).
(California Health & Safety code §
25249.5, et seq.)
Maintenance17. . For your safety,
service and maintenance should be
performed regularly by a qualied
technician.
The warnings, cautions, and 18.
instructions discussed in this
instruction manual cannot cover
all possible conditions and
situations that may occur. It must
be understood by the operator that
common sense and caution are
factors which cannot be built into
this product, but must be supplied
by the operator.
Replacement parts and 14.
accessories. When servicing, use
only identical replacement parts.
Use of any other parts will void the
warranty. Only use accessories
intended for use with this tool.
Approved accessories are available
from Harbor Freight Tools.
Do not operate tool if under the 15.
inuence of alcohol or drugs. Read
warning labels on prescriptions to
determine if your judgment or reexes
are impaired while taking drugs. If
there is any doubt, do not operate the
tool.
Page 3For technical questions, please call 1-800-444-3353.SKU 92841
Page 4
Health and Safety
Hazard
Risk of Explosion
or Fire from Flammable Materials
Risk of Fire or
Explosion from Materials Incompatible
with Aluminum.
Inhalation Hazard.
Risk of Ejected Objects or Sonic Injury.
Special Warnings About Paint Sprayers
Nature and Cause of Hazard Prevention of Hazard
Spraying paints, solvents and thinners mixes them with oxygen in the
air. This creates a more explosive
mixture than these materials in their
uid form. Rapid res and explosions
of these mixtures can cause death
or severe injury as well as signicant
property damage.
Certain solvents, including
1,1,1-Trichloroethane and Methylene
Chloride can chemically react with the
Aluminum used in this spray equipment. This can cause an explosion
which may result in death or serious
personal or property injury. Other
chemicals ,when mixed, may cause
unpredictable results.
Inhaling solvents or sprayed materials
may cause severe injury to the lungs
or body, due to their chemical make
up or the fact that they may coat the
interior of the lungs.
Many components of this tool and any
air pressure powered tool are under
signicant air pressure, even after the
air supply is disconnected. A signi-
cant risk of injury caused by ejected
components or materials diverted by
the stream of air pressure exists. High
pressure air escaping suddenly may
cause hearing injury.
Never spray materials near re, ame, electrical spark or any ignition source.
Never smoke when spraying or in the vicinity
of spraying. Never smoke in the work area.
Always provide good ventilation during and
after spraying to eliminate any enclosed
explosive atmosphere.
Inform yourself by reading the information
provided with each solvent before introducing to the sprayer. Never spray the solvents
named at left in this sprayer which contains
Aluminum. Never use these materials for
cleaning equipment. Never use any solvent
if in doubt of its composition or compatibility
with Aluminum, other materials or this spraying equipment.
Use an ANSI approved ventilator or face
mask. NOTE: Some face masks, such as
paper lters provide only limited protection
against harmful sprays and fumes. Consult
safety documents provided with the materials you are spraying or an industrial safety
expert when determining the appropriate
respiratory protection.
Before doing any service to the sprayer,
disconnect it from the air supply. Then
depressurize the sprayer by pointing it in a
safe direction and holding the trigger until all
pressure is released.
Never point the nozzle toward any person
or animal.
Always wear ANSI approved safety glasses
or goggles when using or servicing this tool.
Always wear hearing protection when using
or servicing this tool or any air pressure
equipment.
UNPACKING
When unpacking, check to make sure the following parts are included.
LVLP Spray Gun
Paint Cup
If any parts are missing or broken, please call Harbor Freight Tools at the number on
the cover of this manual.
Page 4 For technical questions, please call 1-800-444-3353. SKU 92841
REV 05d
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ASSEMBLY
First, prepare your air supply.
Coupler
Plug
Tool
Quick
Coupler
Valve FilterOiler
Quick
Coupler
Recommended Air Line Components
Regulator with
Pressure Gauge
Coupler
Plug
Air Hose
on Reel
Air
Compressor
1. This tool requires up to 45 PSI and
up to 9 SCFM. Provide yourself
with a compressed air supply which
will meet these requirements. Air
compressors and related supplies are
available from Harbor Freight Tools.
For best results, arrange your 2.
compressed air supply to include a
lter and regulator as indicated in
the schematic diagram above. The
addition of quick connect air valves,
reel and other features will enhance
your air supply.
Trigger (26)
Reservoir Cap
(32)
Nipple (36)
Paint Cup (35)
4. Attach the Paint Cup (35) to Reservoir
Cap (32) on the bottom of the Spray
Gun, as shown in the photo.
Attach your air hose (not supplied) to 3.
the Spray Gun at the Nipple (36), at
the base of the handle. At your option,
you may rst attach a quick connect
valve (not supplied) to the Nipple (36)
to attach with your air hose.
REV 05d; 09k
Page 5For technical questions, please call 1-800-444-3353.SKU 92841
Page 6
OPERATION
Prepare the work piece to be painted 1.
according to paint manufacturer’s
directions. Prepare your paint mixture
according to paint manufacturer’s
directions.
NOTE: In most cases, paint must be
thinned for proper spraying. Be sure
to use a thinner recommended by the
paint manufacturer.
Fill the Paint Cup (35) no more than 2.
2/3 full with your paint mixture. Screw
the Reservoir into the Reservoir Cap
(32) being sure the Reservoir Seal
(33) is in place.
Turn on your air compressor, 3.
and adjust the regulator to the
recommended pressure (20 - 45 PSI).
IMPORTANT:4. Before applying paint to
your work piece, test spray a piece of
scrap material. In most cases both the
paint mixture and spray pattern will
have to be adjusted for best results.
To spray, squeeze the Trigger (26), as 5.
you move the Sprayer past the work
material. Release the Trigger (26) at
the end of each pass. Repeat until
you have proper paint coverage of the
work piece.
When you have completed painting 6.
your project, disconnect the Sprayer
from its air pressure source and
immediately clean following the
directions in the Maintenance section
on page 8.
Painting Tips
Successful spray painting is a
skill which requires knowledge of your
equipment, familiarity with your paint
materials and experience. Differences in
paints, work materials and environmental
conditions make every painting task
unique. For best results, practice with your
painting mixture on a scrap piece before
beginning to paint your work material.
It is critical that the surface be
properly prepared before painting. It
will be difcult to achieve a satisfactory
painted surface if the original surface is
dirty, rough or wet.
Paint Mixture
Each paint mixture will vary. You
may use solvent or water based paints.
Each of these causes a different paint
viscosity, and has a different ow rate and
drying time. High viscosity is thick, like
syrup. Low viscosity is thin, like water.
The purpose of the solvent is to
make the paint liquid so it can be applied.
Once applied, the solvent evaporates,
leaving the pigment and its binders in
place. The solvent is also used as a clean
up medium. Paint mixtures which are to
be sprayed are generally less viscous
(thinner) than mixtures which are to be
applied with a brush. Thus you will most
often have to add extra solvent to a paint
which is to be sprayed.
When paint is sprayed, it is broken
into tiny droplets, then blown by highpressure air onto the surface. During this
spraying process, the surface of each
paint droplet will begin to dry. When it hits
the work material, the droplet must liquefy
again, and mix with the droplets hitting
alongside it. Ideally, these droplets will mix
evenly forming a smooth surface.
If the paint mixture is too thick, the
droplets will not form a smooth layer, and
the resulting surface can be described
as “pebbly” or “orange peel”. If the paint
mixture is too thin, the paint will run,
forming long drips before they are thick
enough to form a satisfactory coat. Vertical
Page 6 For technical questions, please call 1-800-444-3353. SKU 92841
Page 7
surfaces are more prone to “run” than
horizontal surfaces due to the effect of
gravity.
Applying the Paint
In most cases, it is best to
move the paint spray from side to
side, overlapping the previous paint.
In this way you will gradually build up
the paint layer without leaving any
obvious edges.
To paint in this way, the spray
pattern should be set to vertical.
It is important to prevent excess paint at the beginning and end of
each stroke. Holding the sprayer away
from the work piece, squeeze the trigger to start the spray. Then move the
spray gun in to within 14-16 inches
of the work piece. Move the sprayer
smoothly across the work piece, keeping a consistent distance. At the end
of each stroke, pull the sprayer away
from the work piece as you release
the trigger.
paint goes on very thin and threatens
to run, stop spraying immediately. Add
more paint to your mixture to thicken
the paint. Test on a piece of scrap
material before resuming work.
As you work, carefully observe the way the paint accumulates
on the work surface. It is more important to maintain a good paint surface
than to form an opaque (thick) paint
coat. You can always apply a second
coat to get the coverage you want. If
the surface is ruined, however, you
will have to start over with surface
preparation.
If the surface does not smooth
out in a few seconds after applying the
paint, your paint mixture is probably
too thick. Thin your paint slightly and
test on a piece of scrap material. If the
Page 7For technical questions, please call 1-800-444-3353.SKU 92841
Page 8
HOW TO ADJUST PAINT FLOW AND AIR PRESSURE
To adjust the spray pattern, loosen the Nozzle Lock Ring (1) by turning it
counterclockwise, then rotate the Air Nozzle (2), then retighten the Nozzle
Lock Ring (1). For a vertical spray pattern, the “ears” of the Air Nozzle (2)
should be horizontal. For a horizontal pattern, the “ears” should be vertical. In
other words, the position of the Air Nozzle and the spray pattern are opposite.
Further adjustment of the spray pattern may be made by adjusting the Spray
Control Knob (27).
To control the amount of paint mixture being sprayed, adjust the Fluid
Valve Control Knob (23). Turning the Knob
clockwise will reduce the amount of paint,
turning it counterclockwise will increase the
amount of paint available.
To control the amount of air pressure
passing through the Sprayer, adjust the Air
Control Knob (12). Turning the Knob clockwise will reduce the air pressure, and turning it counterclockwise will increase the air
pressure. CAUTION: Do not overtighten the
Knob, as this will cut off the air supply, and
may damage the Air Control Seal (10).
Spray
Control
Knob (27)
Air
Control
Knob (12)
Fluid
Control
Knob (23)
Maintenance
After each use, thoroughly clean the spray gun.
1. Empty the Paint Reservoir of paint, and wipe it out with a clean rag.
2. Fill the Paint Reservoir about halfway with the solvent which is
appropriate for the paint you have sprayed.
3. Spray the solvent into an appropriate receptacle for proper disposal.
Continue to spray until paint in the interior of the Spray Gun is ejected
and the solvent spray is clear.
4. Using a clean rag wetted with solvent, wipe off the Spray Gun to remove
paint from the exterior.
5. Store your paint sprayer in a clean dry place.
Page 8 For technical questions, please call 1-800-444-3353. SKU 92841
Page 9
Troubleshooting
Problem Possible Causes Suggested Repairs
a) Air Nozzle cracked or worn.
Paint breaking, spitting,
uttering or irregular
spray
One-sided paint pattern
Small spray area
Split Spray Pattern a) Air pressure too high
Paint spatters, does not
spray evenly
Not enough air pressure
to spray the paint
Inadequate coverage.
Paint “fogs” on the
workpiece
Material leaking from
Paint Cup Nipple
Paint leaks from nozzle
when trigger is operated
b) Leak at attachment or seal
c) Needle packing worn out
d) Insufcient paint in cup
e) Vent hole in paint container
clogged
a) One of the vent holes in the
Air Nozzle is clogged
a) Bore of Air Nozzle is partially
clogged
a) Paint mixture is too thick
b) Insufcient air pressure
c) Too much paint mixture
d) Dried paint in Air Nozzle
a) Air Needle partially closed
b) Dried material in Air Ball
Valve or Air Nozzle
c) Insufcient air supply
Air pressure too high for the
viscosity of the paint mixture
a) Dried material is in threads
b) Nipple is not tight
a) Worn Fluid Needle
b) Dried paint in Air Nozzle
c) Loose or worn Needle Packing
a) Replace
b) Clean threads and seal and tighten
c) Clean, repair or replace packing
d) Add more paint to cup
e) Clean out vent hole
a) Clean the hole using a solvent
a) Clean Air Nozzle using solvent
a) Reduce air pressure using the
regulator in your air pressure system,
or by turning the Air Valve Control Knob
clockwise
a) Thin the paint mixture
b) Increase the air pressure using the
regulator or the Air Valve Control Knob.
Do not exceed 70 psi.
c) Reduce the amount of paint owing
into the sprayer by turning the Fluid Valve
Control Knob clockwise
d) Clean the Air Nozzle using solvent
a) Open Air Ball Valve by turning the air
Valve Control Knob counterclockwise
b) Clean the dirty part in solvent
c) Adjust the regulator in your system, or
increase air pressure. DO NOT INCREASE PRESSURE BEYOND 50 psi
MAX.
Reduce the air pressure or add more
paint to the mixture to increase viscosity
a) Clean threads using solvent
b) Tighten nipple
a) Replace Fluid Needle
b) Clean Air Nozzle in solvent
c) Tighten or replace Needle Packing
Page 9For technical questions, please call 1-800-444-3353.SKU 92841
Page 10
Parts List
Part Description
1 Nozzle Lock Ring
2 Air Nozzle
3 Nozzle Inner Ring
4 Spray Nozzle
5 Nozzle Washer
6 Housing
7 Trigger Pin Snap Ring
8 Trigger Pin
9 Trigger Lock
10 Air Control Seal
11 Air Control Needle Valve
12 Air Control Knob
13 Air Control Valve Seal
14 Air Control Valve Seat
15 Air Control Valve Seal
16 Air Control Valve Body
17 Air Control Seal Ring
18 Air Control Valve Spring
Part Description
19 Air Control Lock Nut
20 Fluid Needle Valve
21 Fluid Needle Valve Mount
22 Fluid Needle Valve Spring
23 Fluid Needle Valve Adjuster
24 Fluid Control Knob
25 Nozzle Packing Fitting
26 Trigger
27 Spray Control Knob
28 Spray Control Seat
29 Spray Control Pin
30 Spray Control Spring
31 Spray Control Cap
32 Reservoir Cap
33 Reservoir Seal
34 Siphon Tube
35 Paint Cup
36 Air Intake Nipple
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR
DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE
BUYER THAT HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT
OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN
FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY STATES THAT ALL
REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND
LICENSED TECHNICIANS AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK
AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT
OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION
OF REPLACEMENT PARTS THERETO.
Page 10 For technical questions, please call 1-800-444-3353. SKU 92841
Page 11
Assembly Drawing
NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
Page 11For technical questions, please call 1-800-444-3353.SKU 92841
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