®
21 PC PAINT SPRAY GUN KIT
Model 90985
ASSEMBLY and OPERATING
INSTRUCTIONS
®
3491 Mission Oaks Blvd., Camarillo, CA 93011
Copyright © 2003 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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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
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, 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.
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. Guard against electric shock. Prevent body contact with grounded surfaces such as
pipes, radiators, ranges, and refrigerator enclosures.
16. 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.
17. 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.
18. Use proper size and type extension cord. If an extension cord is required, 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.
19. Maintenance. For your safety, maintenance should be performed regularly by a
qualified technician.
20. Compressed air only. Never use combustible gas as a power source.
21. Do not spray near open flames, pilot lights, stoves, heaters, or any other heat
source. Most solvents and coatings are highly flammable, particularly when sprayed.
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22. Clean Sprayer with care. Use non-flammable solvents.
23. Do not smoke while spraying. Most solvents and coatings are highly flammable,
particularly when sprayed.
24. 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.
25. 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.
26. Never release the sprayer lid while the cup is pressurized.
27. Never point a spray gun at a person or animal. Always properly mask all objects
that are not to be painted.
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.
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.)
Unpacking
When unpacking, check to make sure the parts listed on pages 10, 11, and 12 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.
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Operation
1/4” NPS
Sprayer
For best service you should incorporate an oiler, regulator, and inline filter, as shown in the
diagram above. Hoses, couplers, oilers, regulators, and filters are all available at Harbor
Freight Tools.
1. You will need to prepare a 1/4” air connector (sold separately) to connect to the air inlet on
either the Gravity Feed or Touch-up Sprayer. First, wrap the 1/4” air connector (not included)
with pipe thread seal tape before threading it into the Air Inlet (see below).
Connect the 3/8” ID Air Source Hose to the Spray Gun.
2. Set the air pressure on your compressor to 50 PSI. Do not exceed the maximum air
pressure of 50 PSI.
3. Check the air connection for leaks and then disconnect the tool from the air source.
Gravity Feed Sprayer
Touch-Up Sprayer
Trigger (5b)
Air Inlet (14b)
Air Regulator (3b)
Adjusting Screw (17b)
Spray Pattern
Adjust Knob (4a)
Air Nozzle (1b)
Cup (2)
Fluid Adjust
Knob (11a)
Air Adjust
Valve (17a)
Plastic Cup (6)
Trigger (20a)
Air Inlet (19a)
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Operation (continued)
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 (see FIGURE 1). This sprayer can spray mate-
rials with a viscosity range of 10 to a maximum of 60 (DINS). Material with a higher viscosity
can be used only with water soluble products (outdoor and indoor wall applications). Use
high quality products.
FIGURE 1
To test the viscosity of a material:
Attach to wall here.
1. Place your finger over the output hole of the Viscosity Meter (4).
See FIGURE 1.
2. Fill the Cup on the Viscosity Meter (4) to the top. See FIGURE 1.
3. While holding the Viscosity Meter (4) over the material source
can, let go of the output hole and count the number of seconds it
takes for it to empty completely. The number of seconds
is the viscosity rating.
Cup
Place finger over
hole in the bottom.
Guidelines forThinning
PAINT OR
VISCOSITY
MATERIAL
Filler
10 to 20
15 to 25
20-35
Wood Stain
2- Pack Paint
Oil Based Paint
35-40
Water Soluble or
Finish Products
40 or higher
Note: These are general guidelines only. Refer to the material manufacturer’s
reccomendations for thinning instructions.
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FIGURE 2
Operation (continued)
Note: When not in use, hang the Gravity Feed Spray
Gun as shown in FIGURE 2.
Preparing the area
1.
2.
Mask all objects you do not want sprayed.
Lay the appropriate size Tack Cloth (16) on the
floor, and attachTack Cloths (16) to the surrounding
walls.
Preparing and Operating the HVLP Gravity Spray Gun
Refer to page 5 and the Assembly Drawing on pages 10 and 11.
Note: We recommend you practice on scrap material to adjust and become
familiar with the Gun.
1.
2.
Detach the Plastic Cup (2). Insert a Filter (14) into the bottom of the Plastic Cup (2)
with the stem end pointing into the cup. This will prevent dirt and debris from entering
the HVLP Gravity Feed Gun (1).
Mount the Plastic Cup (2) to the HVLP Gravity Feed Gun (1). Make sure that the
Plastic Cup (2) is securely attached. Fill the cup with material that has already been
checked for viscosity (see page 6). Close to Cup (2) tightly to avoid leakage.
Connect the air source hose to the Air Inlet (19a). Turn on your air compressor. Do not
exceed the 50 PSI maximum.
Pull the Trigger (20a) slowly and move the Spray Gun in parallel strokes to the object
being painted. Keep the distance from the object being painted at 4” to 12”. This may
slightly differ depending on the flow adjustment and the material being sprayed.
Release the Trigger (20a) after each forward movement; pull the Trigger (20a) again on
the return movement.
When using a vertical pattern, move the Spray Gun in a horizontal motion; with a
horizontal pattern move the Spray Gun in a vertical motion. A round pattern requires a
greater distance from the object being painted.
3.
4.
5.
6.
7.
When finished, release the Trigger (20a) and disconnect from the air source. The
Plastic Cup (2) and Spray Gun may still hold air pressure, fire the Spray Gun toward
scrap material until all of the pressure is expended. Open the Cap on the Plastic Cup
(2) before removing the Lid.
Note: Gun adjustments on page 8.
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Operation (continued)
HVLP Gravity Gun Adjustments
Refer to page 5 and the Assembly Drawing on page 11.
Note: We recommend you practice on scrap material to learn the fine tune
adjustments.
1.
2.
To change the spray pattern, turn the Spray Pattern Adjust Knob (4a).
To regulate the amount of material entering the Spray Gun, adjust the Fluid Adjust
Knob (11a).
3.
To fine tune the air flow, adjust the Air Adjust Knob (17a).
Preparing and Operating Touch-up Gun
Refer to page 5 and the Assembly Drawing on pages 10 and 12.
Note: We recommend you practice on scrap material to adjust and become
familiar with the Gun.
1.
2.
3.
4.
Detach the Plastic Cup (6). Fill the cup with material that has already been checked for
viscosity (see page 6). Close the Plastic Cup (6) tightly to avoid leakage.
Mount the Plastic Cup (6) to the Touch-up Gun (5). Make sure that the Plastic Cup (6)
is securely attached.
Connect the air source hose to the Air Inlet (14b). Turn on your air compressor. Do not
exceed the 50 PSI maximum.
Press the Trigger (5b) slowly and move the Spray Gun in parallel strokes to the object
being painted. Keep the distance from the object being painted at 4” to 12”. This may
slightly differ depending on the flow adjustment and the material being sprayed.
Release the Trigger (5b) after each forward movement; press the Trigger (5b) 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.
5.
6.
7.
When finished, release the Trigger (5b) and disconnect from the air source. As the
Plastic Cup (6) and Spray Gun may still hold air pressure, fire the Spray Gun toward
scrap material until all of the pressure is expended.
Touch-up Sprayer Adjustments
Refer to page 5 and the Assembly Drawing on page 12.
Note: We recommend you practice on scrap material to learn the fine tune
adjustments.
1.
2.
To change the spray pattern, turn the Air Nozzle (1b).
To regulate the amount of material entering the Spray Gun, adjust the Adjusting Screw
(17b).
3.
To fine tune the air flow, adjust the Air Regulator (3b).
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Troubleshooting
PROBLEM
REMEDY
CAUSE
1. Add undiluted product
(check viscosity)
1. Paint too diluted
Paint drips on the
2. Reduce paint flow by tightening
Paint Adjustment Screw
2. Improper spray adjustment
3. Too much air flow
object being painted
3. Reduce air flow by turning Air
Adjustment Screw down
4. Release Trigger on back stroke
5. Increase distance between
nozzle and object
4. Holding Trigger too long
5. Spraying too close
1. Add undiluted product
(check viscosity)
1. Paint too diluted
Paint Application
uneven or irregular
2. Increase paint flow by loosening
Paint Adjustment Screw
3. Increase air flow by loosening
Air Adjustment Screw
2. Improper spray adjustment
3. Air flow too weak
4. Move Spray Gun more slowly
5. Clean components
4. Spray movement too fast
5. Gun clogged
6. Spray closer to object
7. Adjust Nozzle
6. Spray distance too far
7. Nozzle set too fine
Spray Gun not
operating
1. Add thinner (check viscosity)
2. Clean components
3. Replace Air Hose
1. Paint not thinned enough
2. Spray Gun clogged
3. Air Hose is broken
4. Clean or replace Air Filter
5. Close paint cup
4. Air Filter clogged
5. Paint Cup not fully closed
Maintenance
Disconnect the tool from the air source.
1. Remove the Spray Gun Plastic Cup (2 or 6).
2. Pour residual paint into the paint container and seal it.
3. Pour non-flammable paint thinner into the Plastic Cup (2 or 6). If water based paint was
used, you can use water.
4. Secure the Plastic Cup (2 or 6) to the appropriate Gun and shake the liquid in the cup.
5. Connect to the air source and turn on the air compressor.
6. Spray the liquid onto a piece of scrap material until the
spray material is free of paint.
7. Repeat if necessary.
8. After following the above procedure, use the
brush and wire set to further clean the
Spray Gun.
Brush & Wire Set
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Main Parts List and Assembly Drawing
Part No.
Description
Qty.
1
1
1
1
1
1
1
1
Part No.
9
10
11
12
13
14
15
16
Description
Brush
Brush
Qty.
1
1
1
1
1
3
2
3
1
2
3
4
5
6
7
8
HVLP Gravity Spray Gun
20.2 oz. Plastic Cup
Gun Holder
Viscosity Measure
Touch-up Gun
8.4 oz. Plastic Cup
Wrench
Needle
Plastic Tube
Plastic Grip Brush
Filter
Brass Nipple
Tack Cloth
Brush
PLEASE READTHE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDEDTHE PARTS DIAGRAM INTHIS
MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR DISTRIBU-
TOR MAKES ANY REPRESENTATION ORWARRANTY OF ANY KINDTO THE BUYERTHAT 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 STATESTHAT 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.
NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
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Gravity Feed Sprayer Assembly Drawing and Parts List
Note: When ordering parts off of the parts list below, make sure to include the letter “a” after
the part number.
24
4
25
1
2
8
11
17
10
16
9
7
3
6
5
15
13 14
12
18
21
21
23
20
22
23
19
Part No.
1a
2a
Description
Part No.
17a
18a
Description
Air Adjustment Knob
Handle
Air Nozzle W/Brass Cap
Fluid Nozzle
Gun Body
3a
19a
Air Inlet
4a
5a
Spray Pattern Adjust Knob
Washer
20a
21a
Trigger
Gasket
6a
7a
Packing Nut
Gasket
22a
23a
Trigger Stud
E-clip
8a
Housing
24a
Hook
9a
Paint Needle
Spring
Fluid Adjust Knob
Washer
Valve Nut
Stem
25a
Gasket
10a
11a
12a
13a
14a
15a
16a
Nylon Piston
Spring
NOTE: Some parts are listed and shown for illustration purposes only and are not available individually as
replacement parts.
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Touch-up Sprayer Assembly Drawing and Parts List
Note: When ordering parts off of the parts list below, make sure to include the letter “b” after
the part number.
5
4
14
12
13
11
9 10
2
15
1
6
7
8
16
17
3
Part No.
1b
2b
3b
4b
5b
6b
7b
8b
Description
Part No.
Description
Valve Nut
Stem
Spring
0-ring
Air Inlet
Paint Needle Set
Spring
Air Nozzle W/Brass Cap
Fluid Nozzle
Air Regulator Set
Gun Body
Trigger
Trigger Screw
Gasket
10b
11b
12b
13b
14b
15b
16b
17b
Nut
Adjusting Screw
9b
Gasket
NOTE: Some parts are listed and shown for illustration purposes only and are not available individually as
replacement parts.
Page 12
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