Harbor Freight Tools 43760 User Manual

®

PAINT SPRAY GUN

43760

ASSEMBLY AND OPERATING

INSTRUCTIONS

Due to continuing improvements, actual product may differ slightly from the product described herein.

3491 Mission Oaks Blvd., Camarillo, CA 93011

Visit our Web site at http://www.harborfreight.com

TO PREVENT SERIOUS INJURY,

READ AND UNDERSTAND ALL WARNINGS

AND INSTRUCTIONS BEFORE USE.

Copyright© 2000 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.

Manual revised 08/05

IMPORTANT: The Spray Gun must be cleaned immediately after use.
Improper cleaning is a common reason for the Spray Gun not to work.

Contents

Unpacking................................................................................................... 2

Specifications............................................................................................. 3

Safety W arnings 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

Unpacking

When unpacking, check to make sure the product is intact and undamaged. If an y parts are
missing or broken, please call Harbor Freight Tools at the number on the cover of this
manual as soon as possible.

SKU 43760 Page 2

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of man ual.

Specifications

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

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.

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. When not in use, tools m ust be stored in a dry location to inhibit
rust. Always lock up tools and k eep 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 f or a purpose for which it wa s
not intended.

6. Dress properly. Do not wear loose clothing or jew elry 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. Alwa ys wear ANSI approved impact saf ety goggles

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.

SKU 43760 Page 3

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of man ual.

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. Av oid 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 an y other condition that may aff ect 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 m ust 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 saf ety , 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. Ne v er use comb ustib le gas as a po wer 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 flammab le, 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.

SKU 43760 Page 4

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of manual.

21. Read all of the information concerning coating products and c leaning solvents.
Chlorinated solvents (e.g. 1-1-1 Trichlorethylene and Methylene Chloride, also known
as methyl chloride) can chemically react with aluminum and may e xplode . Many paint
spray ers 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 per son or animal. Serious injury could occur.

26. Spraying hazardous materials ma y result in serious injury or death. Do not spr ay
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,

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.

et seq.

)

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.

SKU 43760 Page 5

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of manual.

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.

Control Layout

Pattern Control Knob (14)

FIGURE 1

Air Cap Set (1)

Trigger (32)

Air Inlet (34)

Cup (43)

Fluid Control

Knob (15)

SKU 43760 Page 6

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of manual.

IMPORTANT: The Spray Gun must be cleaned immediately after use.
Improper cleaning is a common reason for the Spray Gun not to work.

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.

FIGURE 2

Conventional

HVLP

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 the y 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.

SKU 43760 Page 7

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of manual.

IMPORTANT: The Spray Gun must be cleaned immediately after use.
Improper cleaning is a common reason for the Spray Gun not to work.

Note: Always make sure the Vent (45) 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) 90 degrees. After the adjustment, tighten the Lock Ring by hand.
See FIGURE 3 below.

Fan Direction and Pattern Adjustment

Lock Ring

FIGURE 3

Air Cap

Horizontal Fan

Vertical Fan

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.

FIGURE 4

Flat/Open Round/Closed

SKU 43760 Page 8

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of manual.

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 (continued)

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 the Trigger (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) slo wly, checking
the mixture after each adjustment.
See FIGURE 5 below.

FIGURE 5

Too Coarse
(Tighten)

Correct

Too Fine
(Loosen)

SKU 43760 Page 9

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of manual.

IMPORTANT: The Spray Gun must be cleaned immediately after use.
Improper cleaning is a common reason for the Spray Gun not to work.

Techniques

Note: Before spraying, mask all objects you do not want spr ayed and la y cloths (not included)

on the floors.

1 . Always keep the gun at right angles to the workpiece (See FIGURE 6). Pull the Trigger

(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 spray ed. Do not stop the gun
movement while spra ying. If you stop the gun for e ven just a slight pause while spra ying,
the paint will build up and run down the workpiece.

FIGURE 6

(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 (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.

Begin

Stroke

Squeeze

Trigger (32)

FIGURE 7

(T op View)

Release

Trigger (32)

End

Stroke

Note: The speed of the stroke, the adjustment of the Fluid Control Knob (15), 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.

SKU 43760 Page 10

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of manual.

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 f ollo w the paint manufacturer’s recommendations for cleaning, solvent type,

and disposing of used solvent.

Latex Paints: DO NOT USE LATEX PAINTS WITH THIS PRODUCT.
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 Spr ay 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. Empty the Paint Cup (43) and clean it with the solvent.

2. Fill the Paint Cup (43) with solv ent and spr a y it through the Gun into a container, while
shaking the gun. Once the P aint Cup (43) is empty, repeat the process until the solvent
comes out clean.

Disconnect from the air source. After disconnecting, be aw are that air pressure may
still remain in the Spray Gun. P oint 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 remov e any material. Do not use metal objects to clean the Air Cap or
you may dama ge 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 do wn the Gun
body.

5. Always lubricate the Spra y 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.

SKU 43760 Page 11

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of manual.

Parts List

PLEASE READ THE FOLLOWING CAREFULLY

THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM IN THIS
MANUAL AS A REFERENCE T OOL ONLY . NEITHER THE MANUF A CTURER NOR DISTRIBUT OR MAKES
ANY REPRESENT ATION 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
P AR TS OF THE PR ODUCT . IN F ACT, THE MANUFA CTURER AND/OR DISTRIBUT OR EXPRESSL Y 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.

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SKU 43760 Page 12

NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of manual.

REV 10/03; 08/05

Assembly Diagram

14

13

25

24

26

46

11

10

0

9

8

7

6

5

4

3

2

1

22

23

24

31

27

28

38

44

30

29

36
37

32

48

8

5

33

20

34

19

12

35

13

18

15

16

17

45

43

41
42

39

47

40

SKU 43760 Page 13

For technical questions, please call 1-800-444-3353;

Troubleshooting section at end of manual.

REV 10/03; 08/05

IMPORT ANT : Impr oper cleaning is a common reason for the unit not to w ork 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
accompanying possible problems if y ou are experiencing similar difficulties. The solution
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.)

If the steps above do not solve the problem or if the repairs involved are too

complex, contact a qualified technician.

For technical questions, please call 1-800-444-3353.SKU 43760 Page 14

IMPORT ANT : Impr oper cleaning is a common reason for the unit not to w ork properly .
Most problems can be avoided or remedied with prompt, thorough cleaning.

Troubleshooting (continued)

Problem Cause Solution

Sputtering Spray

Will Not Spray

Overspray

Fluid Tip Leakage

Air Leaking from
Air Cap

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. 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

Fluid Leaking from
Packing Nut (22)

If the steps above do not solve the problem or if the repairs involved are too

1. Packing Nut loose

2. Packing worn or dry

complex, contact a qualified technician.

1. Tighten without restricting

2. Replace or lubricate (non-silicone)

For technical questions, please call 1-800-444-3353.SKU 43760 Page 15