Harbor Freight Tools Paint Sprayer 91009 User Manual

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20 OZ. AIR GRAVITY SPRAY GUN  
Model 91009  
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  
 
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.  
Page 3  
SKU 91009  
 
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 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.  
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 page 8 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.  
Page 4  
SKU 91009  
 
Operation  
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.  
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 (32). Connect the 3/8” ID Air Source Hose  
to the Spray Gun.  
2.  
3.  
Set the air pressure on your compressor to 40 PSI. Do not exceed the maximum air  
pressure of 50 PSI.  
Check the air connection for leaks and then disconnect the tool from the air source.  
Vent (30)  
Lid (29)  
Cup (28)  
Air Nozzle (1)  
Fluid Control Knob (12)  
Spray Regulator Knob (20)  
Trigger (37)  
Air Adjusting Valve (31)  
Air Inlet (32)  
Page 5  
SKU 91009  
 
Operation (continued)  
Filling the Cup (28)  
Warning! The Spray Gun must be disconnected from the air source when filling or refilling  
material.  
1.  
Attach the Cup (28) to the Spray Gun. Make sure to include the Filter (27) in between  
the Cup (28) and Gun Body (8) during assembly.  
2.  
3.  
Remove the Lid (29) off the top of the Cup (28) of the Spray Gun.  
Fill the Cup (28) with the appropriate material and replace the Lid (29) on the top of the  
Cup (28). Make sure the Lid (29) is securely tightened. Make sure the Vent (30) is  
closed.  
Note: Before spraying, mask all objects you do not want sprayed and lay cloths (not included)  
on the floors.  
Operation  
Note: We recommend you practice on scrap material to adjust and get familiar with the Gun.  
1.  
Connect the air source hose to the Air Inlet (32). Turn on your air compressor to the  
recommended air pressure of 40 PSI. Do not exceed the 50 PSI maximum.  
2.  
Pull the Trigger (36) 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.  
3.  
4.  
Release theTrigger (36) after each forward movement;pull theTrigger (36) 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.  
5.  
When finished, release the Trigger (36) and disconnect from the air source. The Cup  
(28) and Spray Gun may still hold air pressure, fire the Spray Gun toward scrap material  
until all of the pressure is expended. Before removing the Lid (29), open the Vent (30).  
Spray Gun Adjustments (Refer to page 5 and the Assembly Drawing on page 9)  
Note: We recommend you practice on scrap material to learn the fine tune adjustments.  
1.  
2.  
3.  
To change the spray pattern, turn the Spray Regulating Knob (20) and/or adjust the Air  
Nozzle (1).  
To regulate the amount of material entering the Spray Gun, adjust the Fluid Control  
Knob (12).  
To fine tune the air flow, adjust the Air Adjusting Valve (31).  
Page 6  
SKU 91009  
 
Troubleshooting  
Note: Have any of the following internal repairs completed by an authorized service technician.  
Trouble  
Cause  
Repair  
Gun leaks from fluid tip  
Foreign substance between the fluid tip  
and needle preventing a good seal  
Clean fluid needle in thinner  
or replace nozzle set  
Spray pattern  
sickle shaped  
Air circuit clogged  
Soak in thinner and clean the  
nozzle set and internal needle  
Spray pattern  
oval shaped  
Dirt on fluid pin tip or air outlet  
Turn the air nozzle 180°, clean  
fluid tip pin and air circuit  
Spray pattern flutters  
Not enough material in the cup,  
fluid nozzle not tight, needle sealing  
damaged, nozzle set dirty or damaged  
Refill material, tighten parts,  
clean or replace parts  
Material bubbles or boils  
in the paint cup  
Too much air flowing through the paint  
channel to the cup, loose paint nozzle,  
loose air nozzle, clogged filter, defective  
gasket, or damaged nozzle insert  
Clean, tighten, or replace  
parts  
Note: To clean, change, or replace the Fluid Nozzle  
(2), use the Wrench (35) FIGURE 2, to the  
right.  
FIGURE 2  
Maintenance  
Disconnect from the air source.  
1.  
2.  
3.  
Remove the Lid (29).  
Pour residual paint into the paint container and seal it.  
Pour non-flammable paint thinner into the Cup (28).  
If water based paint was used, you can use water.  
4.  
5.  
6.  
7.  
8.  
Secure the Lid (29) to the Cup (28) 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.  
Remove the entire Cup (28) by un-threading it. Check the Filter (27) in the Gun Body  
(8). If it is not clean, use the Brush (33) to clean it. Replace the Filter (27) and thread on  
the Cup (28). See FIGURE 3 on page 8.  
9.  
Use the Brush (33) to clean the recessed, hard to reach areas of the Gun.  
Page 7  
SKU 91009  
 
Parts List  
Part No.  
1
2
3
4
5
6
7
Description  
Air Nozzle  
Fluid Nozzle  
Air Ring  
Piston Pad  
Compression Ring  
Needle Seal Spring  
Air Piston Seal  
Gun Body  
Paint Needle  
Paint Piston Spring  
Nut  
Fluid Control Knob  
Air Piston Box  
Air Piston Packing  
Air Piston  
Part No.  
Description  
Spray Regulator Knob  
Screw  
Trigger Bolt  
Locking Plate  
Bolt  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
Bolt  
Paint Connector  
Filter  
Cup  
Lid  
Vent  
Air Adjust. Valve Assy.  
Air Inlet  
Brush  
Hex Adapter  
Wrench  
Trigger  
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
Piston Ring  
Air Piston  
Air Piston Spring  
Spray Regulator Screw  
FIGURE 3  
Cup (28)  
Filter (27)  
Gun Body (8)  
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.  
Page 8  
SKU 91009  
 
Assembly Drawing  
Page 9  
SKU 91009  
 
90 Day Warranty  
Harbor Freight Tools 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 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 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  
 

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