Harbor Freight 64 Oz Professional Air Spray Gun Kit Product Manual
2015-05-27
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ASSEMBLY and OPERATING INSTRUCTIONS
Professional Spray Gun Kit
93312
Diagrams within this manual may not be drawn proportionally.
Due to continuing improvements, actual product may differ slightly from the product described herein.
Distributed exclusively by Harbor Freight Tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
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.
For technical questions or replacement parts, please call 1-800-444-3353.
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 2
Specifications ..................................................................................................................2
Safety Warnings and Precautions .................................................................................. 3
Unpacking ........................................................................................................................5
Air Connection .................................................................................................................6
Control Layout .................................................................................................................6
A Comparison: Conventional versus HVLP Spray Guns ..............................................7
Preparation ......................................................................................................................8
Fan Direction and Pattern Adjustment .......................................................................... 8
Techniques ......................................................................................................................10
Maintenance ...................................................................................................................11
Parts List ........................................................................................................................12
Assembly Diagram .........................................................................................................13
Troubleshooting .............................................................................................................. 14
Inlet PSI Range: 50 to 70 PSI
Max. Operating Pressure: 70 PSI
Average Air Consumption for gun: 12.5 SCFM
Average Air Consumption for cup: 7.5 SCFM
Working Range: 3.5 to 14.5 SCFM
Air Pressure at Spray Gun: 10 to 30 PSI
Hose length: 6-1/2 feet
Paint Capacity: 2 Quart
Air Inlet: 1/4” - 18 NPS
Nozzle Size: .071”
Specifications
Save This Manual
You will need the manual for the safety warnings and precautions, assembly instruc-
tions, operating and maintenance procedures, parts list and diagram. Keep your in-
voice 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.
REV 03/07; 06/07
Contents
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 3
Safety Warnings and Precautions
WARNING: When using tool, basic safety precautions should always be followed to
reduce the risk of personal injury and damage to equipment. Read all instructions be-
fore using this tool!
1. Keep work area clean. Cluttered areas invite injuries.
2. Observe work area conditions. Do not use machines or power tools in damp or
wet locations. Don’t expose to rain. Keep work area well lit. Do not use air tools
in the presence of flammable gases or liquids.
3. Keep children away. Children must never be allowed in the work area. Do not let
them handle machines, tools, extension cords, or air hoses.
4. Store idle equipment. 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.
5. Use the right tool for the job. Do not attempt to force a small tool or attachment
to do the work of a larger industrial tool. There are certain 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.
6. Dress properly. Do not wear loose clothing or jewelry as they can be caught in
moving parts. Protective, electrically nonconductive clothes and nonskid footwear
are recommended when working. Wear restrictive hair covering to contain long
hair.
7. Use eye and ear protection. Always wear ANSI approved impact safety goggles.
Always wear an ANSI approved dust mask or respirator when using this Spray
Gun.
8. Do not overreach. Keep proper footing and balance at all times. Do not reach over
or across running machines or air hoses.
9. Maintain tools with care. Keep tools clean for better and safer performance. Follow
instructions for lubricating and changing accessories. Inspect tool cords and air
hoses periodically and, if damaged, have them repaired by an authorized technician.
The handle must be kept clean, dry, and free from oil and grease at all times.
10. Disconnect air supply. Disconnect air hose when not in use, when changing
accessories, and during maintenance.
11. Remove adjusting wrenches. Check that adjusting wrenches are removed from
the tool before attaching to the air source.
12. Avoid unintentional starting. Be sure the trigger is in the Off position when not in
use and before attaching to the air source. Do not carry any tool with your finger
on the trigger, whether it is attached to the air compressor or not.
13. Stay alert. Watch what you are doing, use common sense. Do not operate any tool
when you are tired.
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 4
14. Check for damaged parts. 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 fixtures; and any other condition that may affect proper operation.
Any part that is damaged should be properly repaired or replaced by a qualified
technician. Do not use the tool if the trigger does not operate properly.
15. Replacement parts and 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.
16. Do not operate tool if under the influence of alcohol or drugs. Read warning
labels if taking prescription medicine to determine if your judgement or reflexes are
impaired while taking drugs. If there is any doubt, do not operate the tool.
17. Use proper size and type extension cord. If an extension cord is required for the
compressor, it must be of the proper size and type to supply the correct current to
the compressor without heating up. Otherwise, the extension cord could melt and
catch fire, or cause electrical damage to the compressor. Check your compressor’s
manual for the appropriate size cord.
18. Maintenance. For your safety, maintenance should be performed regularly by a
qualified technician and the unit must be thoroughly cleaned out after every use.
Improper cleaning of the Spray Gun is a common reason for the Spray Gun to
jam or not perform properly.
19. Compressed air only. Never use combustible gas as a power source. Never exceed
the recommended operating pressure of the any of the parts (i.e. hoses, fittings,
gun) of the Sprayer system.
20. Do not spray near open flames, pilot lights, stoves, heaters, the air compressor,
or any other heat source. Most solvents and coatings are highly flammable,
particularly when sprayed. Maintain a distance of at least 25 feet from the air
compressor. If possible, locate the air compressor in a separate room. Do not
smoke while spraying.
21. Read all of the information concerning coating products and cleaning solvents.
Chlorinated solvents (e.g. 1-1-1 Trichlorethylene and Methylene Chloride, also known
as methyl chloride) can chemically react with aluminum and may explode. Many
paint sprayers contain aluminum. If you have any doubt about potential chemical
reactions, contact the solvent or coating manufacturer.
22. Materials used when painting or cleaning may be harmful or fatal if inhaled or
swallowed. Only use in an area with adequate ventilation. Use a respirator or mask
when painting or using cleaning solvents.
23. Never release the sprayer lid while the cup is pressurized.
24. Industrial applications must follow OSHA requirements.
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 5
25. Never point a spray gun at a person or animal. Serious injury could occur.
26. Spraying hazardous materials may result in serious injury or death. Do not spray
pesticides, acids, corrosive materials, fertilizers, and toxic chemicals.
27. WARNING: The brass components 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.)
Note: Performance of the compressor (if powered by line voltage) may vary depending on
variations in local line voltage. Extension cord usage may also affect tool performance.
WARNING: The warnings, cautions, and 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.
Unpacking
When unpacking, check to make sure the product is intact and undamaged. If any parts
are missing or broken, please call Harbor Freight Tools at the number on the cover of
this manual as soon as possible.
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 6
Air Connection
For best service you should incorporate a regulator and inline filter, as shown in the diagram
above. Hoses, couplers, regulators, and filters are all available at Harbor Freight Tools.
Note: Compressor pumps discharge condensed water, oil, or other contaminants along
with the compressed air. Condensation causes “fish eyes” to appear in paint patterns.
To avoid this problem, install water/oil removal filters and controls (not included) as close
to the Spray Gun as possible. If run through the Gun, water and oil will cause damage.
1. You will need to prepare a 1/4” air connector (sold separately) to connect to the air
inlet on the Spray Gun. First, wrap the 1/4” air connector (not included) with pipe
thread seal tape before threading it into the Air Inlet (36). Connect the Red Air Hose
(41) to the Air Outlet Connector (36). Attach the other end of the Red Air Hose (41)
to the Air Inlet (67) on the Gun.
2. Set the air pressure on your compressor to 50 to 70 PSI. Do not exceed the maximum
air pressure of 70 PSI. Also, set the air pressure on the Air Regulator to 10-30 PSI,
as shown on the Gauge (38).
3. Check the air connection for leaks and then disconnect the tool from the air source.
FIGURE 1
Control Layout
Pattern Control Knob (65)
Trigger (52)
Air Inlet (67)
Air Cap Set (46)
Fluid Control Knob (59)
Fluid Inlet
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 7
FIGURE 2
Air Outlet Connector (36)
Safety Valve (2)
Fluid Flow Knob (11)
Fluid Outlet (39)
Air Inlet Connector (36)
Air Regulator (24)
A Comparison: Conventional versus HVLP Spray Guns
Because conventional spray guns require a much higher air cap pressure to atomize
the paint than HVLP Spray Guns, conventional guns have lower transfer efficiencies
and more overspray.
This translates to a significant paint/material savings for HVLP guns, in addition to
making them more environmentally friendly.
To qualify as HVLP, the dynamic air pressure going in the Air Cap must be a maxi-
mum of 10 PSI. The lower the air pressure, the less bounce back and overspray.
See FIGURE 3 below.
Conventional
HVLP
FIGURE 3
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 8
Fan Direction and Pattern Adjustment
Fan Direction
To change the direction of the fan from horizontal to vertical, loosen the Lock Ring
and turn the Air Cap (46) 90 degrees. After the adjustment, tighten the Lock Ring
by hand. See FIGURE 4 below.
FIGURE 4
Horizontal Fan
Vertical Fan
Air Cap
Lock Ring
Preparation
Note: Proper paint material mixture helps to ensure less problems. Be sure to follow
the manufacturer’s directions. Most materials will spray readily if they are thinned
properly.
General tips for Preparation:
1. Mix and thin the paint/materials thoroughly according to the manufacturer’s
directions.
2. Carefully strain the paint/material through a paint strainer or piece of cheese cloth.
3. Remove (un-thread) the Cup (16) from the unit. Fill the Cup (16) to approximately
3/4 full. Thread it back onto the unit. Connect the Fluid Hose (40) form the Fluid
Outlet (39) on the pot to the Fluid Inlet on the Spray Gun.
4. Start the air compressor.
5. To adjust the spray pattern, set up a piece of scrap material to practice on. While
practicing on the scrap material, check to see that the material you are spraying
has the appropriate consistency. If it appears to thin, add a very small amount of
IMPORTANT: Before using for the first time, the spray gun must be cleaned
using a solvent based thinner. If not removed, the red oil used by the
manufacturer for testing and corrosion protection may contaminate paint.
IMPORTANT: The Spray Gun must be cleaned immediately after use.
Improper cleaning is a common reason for the Spray Gun not to work.
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 9
3. Open the Fluid Outlet (39)and Fluid Flow Knob (11). Turn the Fluid Control Knob
(59) clockwise until it is fully closed. See on page 6.
4. After setting up a piece of scrap material, squeeze the Trigger (52) in short bursts
while turning the Fluid Control Knob (59) counterclockwise and observe the spray
patterns until you see the pattern you want. Also, look at the pattern for consistency.
Too much air may cause the spray to come out too fine. Reduce the air pressure
or allow more material to come out by opening the Fluid Control Knob (59). If the
spray appears too thick (you see globs of paint), close down the Fluid Control Knob
(59) slowly, checking the mixture after each adjustment.
See below.
FIGURE 6
Too Fine
(Loosen)
Too Coarse
(Tighten)
Correct
Pattern Adjustment
Warning!! Never exceed the Maximum Inlet PSI of 70 PSI.
1. Remember that the air pressure feeding the gun should be set to 10-30 PSI, using
the Air Regulator (24).
2. To set the pattern size specific to the job, use the Pattern Control Knob (65) (see
FIGURE 1 on page 6). By turning it counterclockwise (all the way open), the pattern
will flatten. Turn the Pattern Control Knob (65) clockwise for a round pattern.
See FIGURE 5 below.
FIGURE 5
Flat/Open
Round/
Closed
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 10
2. To ensure you don’t allow paint to build up, start moving the Spray Gun before you
Squeeze the Trigger (52). When you are finished spraying, release the Trigger (52)
before you stop moving the Spray Gun. Doing so will eliminate distinct overlaps,
producing a blended (feathered) affect. See FIGURE 8 below.
Techniques
Note: Before spraying, mask all objects you do not want sprayed and lay cloths (not
included) on the floors.
1. Always keep the gun at right angles to the workpiece (See FIGURE 7). Pull the
Trigger (52) slowly and move the Spray Gun in parallel strokes to the object being
painted. Keep the distance from the object being painted at 6” to 9”. This may
slightly differ depending on the flow adjustment and the material being sprayed.
Do not stop the gun movement while spraying. If you stop the gun for even just a
slight pause while spraying, the paint will build up and run down the workpiece.
Note: The speed of the stroke, the adjustment of the Fluid Control Knob (59), and the
distance from the workpiece, will determine how much paint is being applied. To
get the best results, try to apply two thin coats of paint versus one thick coat.
3. Clean out the gun thoroughly after EVERY use, according to the instructions
found on the next page.
FIGURE 7
Correct (90o)
Incorrect
(Heavier coat on one
side, uneven coverage)
(Even coverage)
FIGURE 8
(Top View)
End
Stroke
Begin
Stroke
Release
Trigger (52)
Squeeze
Trigger (52)
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 11
Maintenance
SOLVENT SELECTION
Always follow the paint manufacturer’s recommendations for cleaning, solvent type,
and disposing of used solvent.
Latex Paints: Use warm, soapy water.
IMPORTANT: Do not use mineral spirits on latex paints or the mixture will congeal
making it very difficult to remove.
Oil Based Paints: Use mineral spirits.
1. Empty the Paint Cup (16) and clean it with the solvent.
2. Fill the Paint Cup (16) with solvent and spray it through the Gun into a container,
while shaking the gun. Once the Paint Cup (16) is empty, repeat the process until
the solvent comes out clean.
After disconnecting, be aware that air pressure may still remain in the Spray Gun.
Point the Gun into the spent solvent container and squeeze the Trigger again to
make sure no air remains.
3. Remove the Air Cap and soak it in solvent until it is clean. Use an old toothbrush
and toothpicks to remove any material. . Inspect the fluid needle and make sure
it is not bent. If it is bent, have it replaced by a certified service technician.
Do not immerse the Spray Gun Body in solvent!
4. Use the appropriate solvent (depending on the material sprayed) to wipe down the
Gun body.
5. After cleaning your Spray Gun, properly dispose of your cleaning solutions according
to the solution manufacturer’s direction and local hazardous waste standards.
IF A FLAMMABLE SOLVENT NEEDS TO BE USED, ADHERE TO THE FOLLOWING:
1. Follow all of the solvent manufacturer’s clean up instructions and safety
precautions at all times.
2. Always flush the Spray Gun a full hose length from the air compressor.
3. If collecting flushed solvents into a metal container, transfer into a larger
nonmetal container, and flush the metal container.
4. Work far away from any ignition sources in a vapor free area.
REV 08c
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 12
NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
Parts List
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.
Part No. Description Part No. Description
1 Handle 40 Fluid Hose
2 Safety Valve 41 Air Hose (Red)
3 Lock Nut 42 Fluid Nozzle
4 Spring 43 Lock Ring
5 Valve 44 Gasket
6 Valve Gasket 45 Locking Knob
7 Valve Seat 46 Air Cap Set
8 Connector 47 Sealing Gasket
9 Screw 48 Sealing Gasket
10 Nut 49 Packing Nut
11 Fluid Flow Knob 50 Trigger Pin
12 Spring 51 Clip
13 Cap 52 Trigger
14 Suction Tube 53 Needle
15 Gasket 54 Needle Seat
16 Cup 55 Needle Pusher
17 Rivet 56 Gasket
18 Gasket 57 Spring Seat
19 Tube 58 Needle Spring
20 Screw 59 Fluid Control Knob
21 Spring 60 Adjusting Position
22 Rivet (Qty. 2) 61 Adjusting Lever
23 E-clip 62 Clip
24* Air Regulator 63 Adjusting Seat
25* Lock Nut 64 0-ring
26* Air Adjusting Seat 65 Pattern Control Knob
27* Spring Seat 66 Sealing Screw
28* Air Adjusting Seat 67 Air Inlet
27* Spring Seat 68 Air Valve Spring
28* Air Adjusting Screw 69 Air Valve Seat
29* Sealing Nut 70 0-ring
30* Valve Gasket 71 Air Valve
31* Valve Gasket 72 Gasket
32* Nut 73 Air Valve Seat
33* Needle Seat 74 Gasket
34* Air Needle 75 Sealing Nut
35* Spring 76 Head
36 Connector (Qty. 2) 77 Screw
37* Gauge Seat 78 Gun Body
38 Gauge
39 Fluid Outlet
*Parts 24 through 35 and 37 are available as a kit.
For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 93312 Page 13
Assembly Diagram
For technical questions, please call 1-800-444-3353.SKU 93312 Page 14
If the steps above do not solve the problem or if the repairs involved are too
complex, contact a qualified technician.
Troubleshooting
Spray Pattern Diagnosis
The Patterns below resemble symptoms of spray pattern problems. Please refer
to the accompanying possible problems if you are experiencing similar difficulties.
The solution to each problem follows the problem in parentheses.
Problem 1:
1. The Pattern Control Knob (65) is partially closed. (Open Pattern Control Knob (65).)
2. The material is too thick. (Thin material according to the manufacturer’s instructions.)
3. The air pressure is too low. (Increase air pressure. Make sure air pressure feeding into
the pot is within the proper range (50-70 PSI) & air pressure as shown on the Gauge
(38) is within the proper range (10-30 PSI).)
Problem 2:
1. High air pressure. (Reduce air pressure at gun.)
2. Not enough fluid. (Increase fluid.)
3. Pattern Control Knob (65) open too much. (Partially close Pattern Control Knob (65).)
Problem 3:
1. Air Cap plugged. (Clean the Air Cap.)
2. Air cap loose or dirty seat. (Clean and tighten.)
3. Dried material on fluid tip. (Use a nonmetallic point to clean the Air Cap.)
Problem 4:
1. Dirt on one side of the fluid tip. (Clean the fluid tip.)
2. Holes on one side of the Air cap are plugged. (Clean the Air cap with a nonmetallic
point.)
For technical questions, please call 1-800-444-3353.SKU 93312 Page 15
If the steps above do not solve the problem or if the repairs involved are too
complex, contact a qualified technician.
Troubleshooting (continued)
1. Low material level
2. Cup tipped too far
3. Clogged Air Vent
4. Loose fluid inlet connections
5. Dry or loose fluid needle Packing Nut
6. Loose/damaged fluid tip/seat
1. No pressure at gun
2. Fluid control not open enough
3. Fluid too thick
1. Improper application speed
2. Improper distance from workpiece
3. Too much pressure
1. Dirty tip
2. Tight Packing Nut
3. Broken fluid needle spring
4. Worn or damaged tip
1. Dirty air valve/seat
2. Sticking air valve
3. Damaged air valve spring
4. Worn/damaged air valve/seat
5. Bent valve stem
1. Packing Nut loose
2. Packing worn or dry
Sputtering Spray
Will Not Spray
Overspray
Fluid Tip Leakage
Air Leaking from
Air Cap
Fluid Leaking from
Packing Nut
1. Refill
2. Hold upright
3. Clean vent hole
4. Tighten
5. Lubricate and/or tighten
6. Adjust or replace
1. Check air hoses
2. Open fluid control
3. Thin fluid or increase pressure
(within Maximum range)
1. Move moderately and parallel
2. Adjust distance
3. Reduce air pressure
1. Clean
2. Loosen Packing Nut
3. Replace
4. Replace tip and/or needle
1. Clean
2. Lubricate
3. Replace
4. Replace
5. Replace
1. Tighten without restricting
2. Replace or lubricate (non-
silicone)
Problem Cause Solution
REV 03/07
For technical questions, please call 1-800-444-3353.SKU 93312 Page 16
If the steps above do not solve the problem or if the repairs involved are too
complex, contact a qualified technician.
90 Day Warranty
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability stan-
dards, and warrants to the original purchaser that this product is free from defects in materials and work-
manship for the period of 90 days from the date of purchase. This warranty does not apply to damage due
directly or indirectly, to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities,
criminal activity, improper installation, normal wear and tear, or to lack of maintenance. We shall in no event
be liable for death, injuries to persons or property, or for incidental, contingent, special or consequential dam-
ages arising from the use of our product. Some states do not allow the exclusion or limitation of incidental
or consequential damages, so the above limitation of exclusion may not apply to you. THIS WARRANTY IS
EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WAR-
RANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with transportation charges
prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise. If
our inspection veries the defect, we will either repair or replace the product at our election or we may elect
to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will return
repaired products at our expense, but if we determine there is no defect, or that the defect resulted from
causes not within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specic legal rights and you may also have other rights which vary from state to
state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353
