Central Pneumatic 43760 User manual

ASSEMBLY AND OPERATING
INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our Web site at http://www.harborfreight.com
®
Copyright©2000 by Harbor FreightTools®. 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.
TO PREVENT SERIOUS INJURY,
READ AND UNDERSTAND ALL WARNINGS
AND INSTRUCTIONS BEFORE USE.
Due to continuing improvements, actual product may differ slightly from the product described herein.
PAINT SPRAY GUN
43760
Manual revised 08/05

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Troubleshooting section at end of manual.
SKU 43760 Page 2
IMPORTANT: The Spray Gun must be cleaned immediately after use.
Improper cleaning is a common reason for the Spray Gun not to work.
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.
Contents
Unpacking ................................................................................................... 2
Specifications............................................................................................. 3
Safety Warnings and Precautions............................................................. 3
Air Connection............................................................................................ 6
Control Layout ............................................................................................ 6
A Comparison: Conventional versus HVLP Spray Guns ........................ 7
Preparation ................................................................................................. 7
Fan Direction and Pattern Adjustment ..................................................... 8
Techniques................................................................................................. 10
Maintenance............................................................................................... 11
Parts List.................................................................................................... 12
Assembly Diagram .................................................................................... 13
Troubleshooting ........................................................................................ 14

For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 43760 Page 3
Specifications
SaveThis 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.
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 before 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. Whennot in use,toolsmustbe stored in adry 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 jewelryastheycanbecaughtinmoving
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 ANSIapproved impact safetygoggles
and a dust mask/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.
Inlet PSI Range 20-55 PSI, 55 PSI Max.
Air Consumption 6 CFM
Paint Capacity 1 Quart
Air Inlet 1/4” - 18 NPS
Nozzle Size .082”
Feed Type Siphon

For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 43760 Page 4
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. Besure the trigger is intheOff position when notin 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 the trigger does not operate properly.
15. Replacement parts and accessories. Whenservicing,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.Readwarninglabels
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 yoursafety,maintenanceshould beperformed regularlybyaqualified
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,
oranyother heat source. Mostsolventsandcoatings arehighlyflammable,particularly
when sprayed. Maintain a distance of at least 25 feet from the air compressor. If
possible,locate the air compressorinaseparateroom. Do not smoke while spraying.

For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 43760 Page 5
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.
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 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
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.

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Troubleshooting section at end of manual.
SKU 43760 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 (34). Connect the 3/8” ID Air Source Hose to
the Spray Gun.
2. Set the air pressure on your compressor to 20-55 PSI. Do not exceed the maximum air
pressure of 55 PSI.
3. Check the air connection for leaks and then disconnect the tool from the air source.
Trigger (32)
Air Inlet (34)
Fluid Control
Knob (15)
Pattern Control Knob (14)
Cup (43)
Air Cap Set (1)
Control Layout
FIGURE 1

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Troubleshooting section at end of manual.
SKU 43760 Page 7
IMPORTANT: The Spray Gun must be cleaned immediately after use.
Improper cleaning is a common reason for the Spray Gun not to work.
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.
Do not use latex paints with this Spray Gun.
2. Carefully strain the paint/material through a paint strainer or piece of cheese cloth.
3. Swing the Cup Locking Lever (39) out of the locked position to remove the Cup (43)
from the Unit. Fill the Cup (43) to approximately 3/4 full. Place the Cup (43) back on
the unit and swing the Cup Locking Lever (39) to the locked position.
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 thinner
(not included). BE CAREFUL when thinning. Proceed slowly, adding very minimal
amounts. NEVER exceed the manufacturer’s thinning recommendations.
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 maximum
of 10 PSI. The lower the air pressure, the less bounce back and overspray.
See FIGURE 2 below.
Conventional
HVLP
FIGURE 2

For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 43760 Page 8
IMPORTANT: The Spray Gun must be cleaned immediately after use.
Improper cleaning is a common reason for the Spray Gun not to work.
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 (1) 90 degrees. After the adjustment, tighten the Lock Ring by hand.
See FIGURE 3 below.
Pattern Adjustment
Warning!! Never exceed the Maximum Inlet PSI of 55 PSI.
1. If you need to reduce the air pressure for specific areas, adjust the air compressor.
2. To set the pattern size specific to the job, use the Pattern Control Knob (14) (see
FIGURE 1 on page 6). By turning it counterclockwise (all the way open), the pattern
will flatten. Turn the Pattern Control Knob (14) clockwise for a round pattern.
See FIGURE 4 below.
Flat/Open Round/Closed
FIGURE 3
Horizontal Fan
Vertical Fan
Air Cap
Lock Ring
FIGURE 4
Note: Always make sure theVent (45) is clear and unclogged.

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Troubleshooting section at end of manual.
SKU 43760 Page 9
IMPORTANT: The Spray Gun must be cleaned immediately after use.
Improper cleaning is a common reason for the Spray Gun not to work.
3. Turn the Fluid Control Knob (15) clockwise until it is fully closed. See FIGURE 1 on
page 6.
4. After setting up a piece of scrap material, squeeze theTrigger (32) in short bursts while
turning the Fluid Control Knob (15) 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 (15). If the spray appears too
thick (you see globs of paint), close down the Fluid Control Knob (15) slowly, checking
the mixture after each adjustment.
See FIGURE 5 below.
FIGURE 5
Too Fine
(Loosen)
Too Coarse
(Tighten) Correct
Fan Direction and Pattern Adjustment (continued)

For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 43760 Page 10
IMPORTANT: The Spray Gun must be cleaned immediately after use.
Improper cleaning is a common reason for the Spray Gun not to work.
2. To ensure you don’t allow paint to build up, start moving the Spray Gun before you
Squeeze the Trigger (32). When you are finished spraying, release the Trigger (32)
before you stop moving the Spray Gun. Doing so will eliminate distinct overlaps,
producing a blended (feathered) affect. See FIGURE 7 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 6). Pull theTrigger
(32) 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. Ifyoustop the gun forevenjustaslightpausewhilespraying,
the paint will build up and run down the workpiece.
Note: Thespeedofthestroke, the adjustment of the Fluid ControlKnob (15), and thedistance
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 6
Correct (90o)
Incorrect
(Heavier coat on one
side, uneven coverage)
(Even coverage)
FIGURE 7
(TopView)
End
Stroke
Begin
Stroke Release
Trigger (32)
Squeeze
Trigger (32)

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Troubleshooting section at end of manual.
SKU 43760 Page 11
Maintenance
SOLVENT SELECTION
Always follow the paint manufacturer’s recommendations for cleaning, solvent type,
and disposing of used solvent.
Latex Paints: DO NOT USE LATEX PAINTS WITHTHIS PRODUCT.
Oil Based Paints: Use mineral spirits.
After each use:
1. Empty the Paint Cup (43) and clean it with the solvent.
2. Fill the Paint Cup (43) with solvent and spray it through the Gun into a container, while
shaking the gun. Once the Paint Cup (43) is empty, repeat the process until the solvent
comes out clean.
Disconnect from the air source. After disconnecting, be aware that air pressure may
stillremain in theSprayGun. Pointthe Gun intothespentsolventcontainer 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. Usethe appropriate solvent(depending on the material sprayed)to wipedownthe 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
accordingtothesolution manufacturer’s directionandlocalhazardouswastestandards.
IF A FLAMMABLE SOLVENT NEEDS TO BE USED, ADHERETOTHE 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.
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.

For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 43760 Page 12
NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
Parts List
PLEASE READTHE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM IN THIS
MANUAL AS A REFERENCETOOL ONLY. NEITHERTHE MANUFACTURER NOR DISTRIBUTOR MAKES
ANY REPRESENTATION ORWARRANTY OF ANY KINDTOTHE BUYERTHAT HE OR SHE IS QUALIFIED
TO MAKE ANY REPAIRS TO THE PRODUCT OR THAT HE OR SHE IS QUALIFIED TO REPLACE ANY
PARTSOFTHE PRODUCT. IN FACT,THEMANUFACTURERAND/OR DISTRIBUTOREXPRESSLY 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.
REV 10/03; 08/05
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For technical questions, please call 1-800-444-3353;
Troubleshooting section at end of manual.
SKU 43760 Page 13
Assembly Diagram
REV 10/03; 08/05
46
2
1
54
67891011
12
1413
13
8
5
2019 1845
17
16 15
33
34
35
32
31
30
29
28
44
27
26
24
25
242322
3
36
37
38
39
40
41
42
43
0
47
48

For technical questions, please call 1-800-444-3353.SKU 43760 Page 14
If the steps above do not solve the problem or if the repairs involved are too
complex, contact a qualified technician.
IMPORTANT: Improper cleaning is a common reason for the unit not to work properly.
Most problems can be avoided or remedied with prompt, thorough cleaning.
Troubleshooting
Spray Pattern Diagnosis
The Patterns below resemble symptoms of spray pattern problems. Please refer to the
accompanyingpossibleproblemsif youareexperiencingsimilar difficulties. Thesolution
to each problem follows the problem in parentheses.
Problem 1:
1. The Pattern Control Knob (14) is partially closed. (Open Pattern Control Knob (14).)
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 (55).)
Problem 2:
1. High air pressure.(Reduce air pressure.)
2. Not enough fluid. (Increase fluid.)
3. Pattern Control Knob (14) open too much. (Partially close Pattern Control Knob (14).)
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 43760 Page 15
If the steps above do not solve the problem or if the repairs involved are too
complex, contact a qualified technician.
IMPORTANT: Improper cleaning is a common reason for the unit not to work properly.
Most problems can be avoided or remedied with prompt, thorough cleaning.
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 (22)
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
FluidTip Leakage
Air Leaking from
Air Cap
Fluid Leaking from
Packing Nut (22)
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. Replaceor lubricate(non-silicone)
Problem Cause Solution