37 PIECE SPRAY GUN KIT
Model 93974
ASSEMBLY and OPERATING INSTRUCTIONS
®
3491 Mission Oaks Blvd., Camarillo, CA 93011
TO PREVENT SERIOUS INJURY,
READ AND UNDERSTAND ALL WARNINGS
AND INSTRUCTIONS BEFORE USE.
Copyright © 2006 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 and replacement parts, please call 1-800-444-3353
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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
handles 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.
11. Remove adjusting keys and wrenches. Check that keys and adjusting wrenches
are removed from the tool before connecting it 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.
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 any 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.
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21.
22.
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.
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.
24.
25.
26.
Never release the sprayer lid while the cup is pressurized.
Industrial applications must follow OSHA requirements.
Never point a spray gun at a person or animal. Serious injury could occur.
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 perfor-
mance.
WARNING:The warnings, cautions, and instructions discussed in this instruction manual
cannot cover all possible conditions and situations that may occur. It must be under-
stood by the operator that common sense and caution are factors which cannot be
built into this product, but must be supplied by the operator.
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Unpacking
When unpacking, check to make sure the parts listed on pages 14 and 16 are included.
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.
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 cause “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 to connect to the air inlet on either the
Large or Small Sprayers. First, wrap the Air Inlet (40 or 23a; shown on next page) with
pipe thread seal tape before threading it into the 1/4” air connector. Connect the 1/4” ID
Air Source Hose to the Spray Gun.
2.
3.
Set the air pressure on your compressor to the recommended pressure for the spray
gun used, as mentioned on page 2. Do not exceed the maximum recommended air
pressure of 40 PSI for the large gun and small gun.
Check the air connection for leaks and then disconnect the tool from the air source.
Note: This unit comes with a 1/4”-18 NPS (IN/OUT) x 25’ Recoil Air Hose which you
may use to connect from the air inlet to the air hose/compressor to give you more
flexibility.
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Small Spray Gun
Trigger (14a)
Pattern Control Knob (12a)
Air Inlet (23a)
Fluid Control Knob (28a)
Air Cap (1a)
Fluid Nozzle (4a)
Paint Cup (34a)
Large Spray Gun
Figure 1
Pattern Control Knob (13)
Air Cap Set (1S)
Trigger (38)
Fluid Control
Knob (29)
Air Inlet (40)
Cup (47)
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Preparation
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.
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.
2.
3.
Mix and thin the paint/materials thoroughly according to the manufacturer’s directions.
Carefully strain the paint/material through a paint strainer or piece of cheese cloth.
Swing the Cup Locking Lever (44 or 35a) out of the locked position to remove the Cup
(47 or 34a) from the Unit. Fill the Cup (47 or 34a) to approximately 3/4 full. Place the
Cup (47 or 34a) back on the unit and swing the Cup Locking Lever (44 or 35a) to the
locked position.
4.
5.
Start the air compressor.
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 thinner
(not included). BE CAREFUL when thinning. Proceed slowly, adding very minimal
amounts. NEVER exceed the manufacturer’s thinning recommendations.
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Fan Direction and Pattern Adjustment
Note: Always make sure the Vent (48-on the large spray gun) is clear and
unclogged.
Fan Direction
To change the direction of the fan from horizontal to vertical, loosen the Lock Ring and
turn the Air Cap (1 or 1a) 90 degrees. After the adjustment, tighten the Lock Ring by
hand. See FIGURE 2 below.
Lock Ring
Horizontal Fan
Air Cap
FIGURE 2
Vertical Fan
Pattern Adjustment
Warning!! Never exceed the Maximum Inlet PSI of 40 PSI.
1.
2.
If you need to reduce the air pressure for specific areas, adjust the air compressor.
To set the pattern size specific to the job, use the Pattern Control Knob (12a or 13) (see
FIGURE 1 on page 6). By turning it counterclockwise (all the way open), the pattern
will flatten. Turn the Pattern Control Knob clockwise for a round pattern.
See FIGURE 3 below.
FIGURE 3
Flat/Open
Round/Closed
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Fan Direction and Pattern Adjustment (continued)
3.
4.
Turn the Fluid Control Knob (28a or 29) clockwise until it is fully closed. See FIGURE 1
on page 6.
After setting up a piece of scrap material, squeeze the Trigger in short bursts while
turning the Fluid Control Knob 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. If the spray appears too thick
(you see globs of paint), close down the Fluid Control Knob slowly, checking the mix-
ture after each adjustment.
See FIGURE 4 below.
FIGURE 4
Too Coarse
(Tighten)
Correct
Too Fine
(Loosen)
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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 5). Pull the Trigger
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.
FIGURE 5
(Heavier coat on one
side, uneven coverage)
Incorrect
(Even coverage)
Correct (90o)
2.
To ensure you don’t allow paint to build up, start moving the Spray Gun before you
Squeeze the Trigger. When you are finished spraying, release the Trigger before you
stop moving the Spray Gun. Doing so will eliminate distinct overlaps, producing a
blended (feathered) affect. See FIGURE 6 below.
Begin
Stroke
End
Stroke
Squeeze
Trigger
Release
Trigger
FIGURE 6
(Top View)
Note: The speed of the stroke, the adjustment of the Fluid Control Knob (28a or 29, 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.
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Operation
Paint and Materials Preparation
Verify with the paint or materials supplier the percentage of thinning required for use
with these Sprayers. Try thinning a small amount and testing the spray action.Thoroughly
mix material before testing.
Viscosity
Viscosity is the technical term used to indicate the liquidity (thickness or thinness) of
the material being sprayed. Viscosity is measured in the number of seconds required
for the material to pass through the viscosity tester (not included). We recommend
that you use a viscosity tester and follow all of the directions in the viscosity tester’s
safety and operations manual.
Preparing the area
1.
2.
Mask all objects you do not want sprayed.
Lay a Paint Cloth (not included) on the floor, and attach Paint Cloths (not included) to
the surrounding walls.
Preparing and Operating both Spray Guns
Note: We recommend you practice on scrap material to adjust and become familiar with the
Gun.
1.
2.
Remove the lid from the Paint Cup (47) or (34a). Insert a Filter (included) into the top
of the Paint Cup. This will prevent dirt and debris from entering the Paint Cup.
Fill the cup with material that has already been checked for viscosity. Close the Paint
Cup tightly to avoid leakage. Mount the Paint Cup to the Spray Gun. Make sure that
the Paint Cup is securely attached.
3.
4.
Connect the air source hose to the Air Inlet (40) or (23a). Turn on your air compressor.
Do not exceed the maximum PSI.
Squeeze the Trigger 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.
5.
6.
Release the Trigger after each forward movement; squeeze the Trigger again on the
return movement.
When using a vertical pattern, move the Spray Gun in a horizontal motion; with a hori-
zontal pattern move the Spray Gun in a vertical motion. A round pattern requires a
greater distance from the object being painted.
Note: Gun adjustments on page 7-9.
7.
8.
When finished, release the Trigger and disconnect the sprayer from the air source. The
Paint Cup and Spray Gun may still hold air pressure; fire the Spray Gun toward scrap
material until all of the pressure is expended.
Immediately follow the Maintenance instructions on page 13 and 14 to avoid paint
quickly drying in your Spray Gun, making it difficult to clean.
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IMPORTANT: The Spray Gun must be cleaned IMMEDIATELY after use.
Improper cleaning is a common reason for the Spray Gun not to work properly.
Materials dry quickly which will render the gun useless.
It is extremely difficult to remove dry paint from small passages within the Gun.
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.
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.
After each use:
1.
2.
Empty the Paint Cup and clean it with the solvent.
Fill the Paint Cup with solvent and spray it through the Gun into a container, while
shaking the gun. Once the Paint Cup is empty, repeat the process until the solvent
comes out clean.
Disconnect from the air source. 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. Do not use metal objects to clean the Air Cap or
you may damage the drilled passages. Inspect the fluid needle and make sure it is
not bent. If it is bent, have it replaced by a certified service technician.
Warning!! 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.
Always lubricate the Spray Gun after cleaning. You may use a non-silicon oil or a light
lubricant on all threaded connections prior to storing the unit.
6.
Disposal: After cleaning your Spray Gun, properly dispose of your cleaning solutions
according to the solution manufacturer’s direction and local hazardous waste standards.
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Maintenance (continued)
Disconnect from the air source.
Warning! The Paint Cup and Spray Gun may still hold air pressure, fire the Spray Gun
toward scrap material until all of the pressure is expended.
1.
2.
3.
Remove the Paint Cup.
Pour residual paint into the paint container and seal it.
Pour non-flammable paint thinner into the Paint Cup. If water based paint was used,
you can use water.
4.
5.
6.
7.
8.
Secure the Paint Cup to the appropriate Gun and shake the liquid in the cup.
Connect to the air source and turn on the air compressor.
Spray the liquid onto a piece of scrap material until the spray material is free of paint.
Repeat if necessary.
After following the above procedure, use the cleaning brushes and to further clean the
Spray Guns.
9.
Allow the Spray Guns to dry completely before storage.
Accessories
Qty.
1
Description
Extra 32 oz. Siphon Feed Paint Cup
Extra 8 oz. Siphon Feed Paint Cup
Round Bristle Brush
1
3
1
Flat Bristle Brush
5
Wooden Toothpick
1
Cleaning Needle
10
Paint Filter
25’ Recoil Hose (19/64" OD; 1/4"-18
NPT (IN/OUT) Mail Brass Fittings)
1
1
4
Blow Gun
Nozzles
(Rubber, Tapered, Safety, and Needle)
1
1
Male Connector
Female Connector
Female Coupler
Male Nipple
1
1
2
Female Nipple
1 roll
Pipe Thread Seal Tape
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Parts List, Large Gun
NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
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Parts List, Small Gun
Note: When ordering parts from this diagram add an “A” suffix. For example Air Cap is part number 1A.
Air Inlet
Fluid Control Knob
Pattern Control Knob
Diagram
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Warranty Card
LIMITED 1 YEAR
WARRANTY
Harbor FreightTools Co. makes every effort to assure that its products meet high quality and durability standards,
and warrants to the original purchaser that this product is free from defects in materials and workmanship for
the period of one year 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; 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 damages 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 WARRANTIES 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 verifies 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 specific 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
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDEDTHE PARTS DIAGRAM INTHIS
MANUAL AS A REFERENCETOOL ONLY. NEITHERTHE 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 BYTHE 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.
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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 (13) or (12a) is partially closed. (Open Pattern Control Knob.)
2. The material is too thick. (Thin material according to the manufacturer’s instructions.)
3. The air pressure is too low. (Increase air pressure within the Maximum PSI (40).)
Problem 2:
1. High air pressure. (Reduce air pressure.)
2. Not enough fluid. (Increase fluid.)
3. Pattern Control Knob (13) or (12a) open too much. (Partially close Pattern Control Knob.)
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 non-metallic 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 non-metallic point.)
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Troubleshooting (continued)
Problem
Cause
Solution
1. Low material level
1. Refill
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
2. Hold upright
3. Clean vent hole
4. Tighten
5. Lubricate and/or tighten
6. Adjust or replace
Sputtering Spray
1. No pressure at gun
2. Fluid control not open enough
3. Fluid too thick
1. Check air hoses
2. Open fluid control
3. Thin fluid or increase pressure
(within Maximum range)
Will Not Spray
Overspray
1. Improper application speed
2. Improper distance from workpiece
3. Too much pressure
1. Move moderately and parallel
2. Adjust distance
3. Reduce air pressure
1. Dirty tip
1. Clean
2. Tight Packing Nut
3. Broken fluid needle spring
4. Worn or damaged tip
2. Loosen Packing Nut
3. Replace
4. Replace tip and/or needle
Fluid Tip Leakage
1. Dirty air valve/seat
1. Clean
2. Sticking air valve
2. Lubricate
3. Replace
4. Replace
5. Replace
Air Leaking from
Air Cap
3. Damaged air valve spring
4. Worn/damaged air valve/seat
5. Bent valve stem
Fluid Leaking from
Packing Nut
1. Packing Nut loose
2. Packing worn or dry
1. Tighten without restricting
2. Replace or lubricate (non-silicone)
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