Central Pneumatic Air Compressor 91011 User Manual

®

®

INDUSTRIAL PAINT SPRAY GUN

Model 91011

ASSEMBLY and OPERATING

INSTRUCTIONS

3491 Mission Oaks Blvd., Camarillo, CA 93011

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

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

Specifications

Operating and Maximum PSI 20 to 50 PSI/ 80 PSI Max.
Air Consumption 4 CFM @ 30 PSI
Paint Capacity 1 Quart
Air Inlet 1/4” - 18 NPS
Nozzle Size .07”
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 aw ay. Children must never be allow ed 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 must be stored in a dry 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 forwhich 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 jewelry as they can be caught in
moving parts. Protective, electrically non-conductive clothes and non-skid footwear
are recommended when working. Wear restrictive hair covering to contain long hair.

7. Use eye and ear protection. Always wear ANSI approv ed impact safety goggles.
Wear an ANSI approved dust mask or respirator when working around chemical
dusts, paints and mists. Wear appropriate ear protection.

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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 perf ormance. 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 spra y ed.

24. 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 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. Industrial applications must follow OSHA requirements.

28. Never point a spray gun at a person or animal. Always properly mask all objects
that are not to be painted.

Note: P erformance of the compressor (if po wered by line v olta ge) may va ry 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 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.

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Operation

1/4” NPS

Sprayer

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 (33). Connect the 3/8” ID Air Source Hose to the Spray
Gun.

2. Set the air pressure on y our compressor to 20 to 50 PSI. Do not exceed the maximum air

pressure of 80 PSI.

3. Check the air connection for leaks and then disconnect the tool from the air source.

Trigger (20)

Cup (26)

Spread Adjusting Valve (12)

Fluid Adjusting
Screw (19)

Air Inlet (33)

Air Adjusting
Screw (27)

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Operation (continued)

Filling the Cup (26)

Warning! The Spray Gun must be disconnected from the air source when filling or refilling

material.

1. Remove the Cup (26) from the Spra y Gun

by pressing the Lever (23) on top of the
Cup (26) counterclockwise.

2. Fill the Cup (26) with the appropriate

material and turn it countercloc kwise while
turning the Lever (23) clockwise. See

FIGURE 1.

NOTE: The Lid (43) of the Cup (26) has a small

vent hole in it. Before each operation,
make sure the vent hole is not covered
and unplugged. Do not use the Spray
Gun if the vent hole is clogged. Do not
turn the Spray Gun over while full or
material will clog the vent hole.

Note: Before spra ying, mask all objects you do not want spra yed and la y cloths (not included)

on the floors.

FIGURE 1

Operation

Note: We recommend you practice on scrap material to adjust and get to know the Gun.

1. Connect the air source hose to the Air Inlet (33). Turn on y our air compressor. Do not

exceed the 80 PSI maximum.

2. Pull the Trigger (20) 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. Release the Trigger (20) after each forward movement; pull the Tr igger (20) again on

the return movement.

4. When using a vertical pattern, move the Spray Gun in a horizontal motion; with a

horizontal pattern move the Spray Gun in a v ertical motion. A round pattern requires a
greater distance from the object being painted.

5. When finished, release the Trigger (20) and disconnect from the air source. The Cup

(26) and Spray Gun ma y still hold air pressure, fire the Spray Gun to ward scrap material
until all of the pressure is expended.

Spray Gun Adjustments

Note: We recommend you practice on scrap material to learn the fine tune adjustments.

1. To change the spray pattern, turn the Spread Adjusting Valve (12) and/or the Air Cap

Set (1).

2. To regulate the amount of material entering the Spray Gun, adjust the Fluid Adjusting

Screw (19).

3. To fine tune the air flow, adjust the Air Adjusting Screw (27).

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Troubleshooting

PROBLEM

Paint drips on the
object being painted

Paint Application
uneven or irregular

CAUSE

1. Paint too diluted

2. Improper spray adjustment

3. Too much air flow

4. Holding Trigger too long

5. Spraying too close

1. Paint too diluted

2. Improper spray adjustment

3. Air flow too weak

4. Spray movement too fast

5. Gun clogged

6. Spray distance too far

7. Nozzle set too fine

REMEDY

1. Add undiluted product
(check viscosity)

2. Reduce paint flow by tightening
Fluid Adjusting Screw (19)

3. Reduce air flow by turning Air
Adjusting Screw (27) down

4. Release Trigger on back stroke

5. Increase distance between nozzle
and object

1. Add undiluted product
(check viscosity)

2. Increase paint flow by loosening
Fluid Adjusting Screw (19)

3. Increase air flo w by loosening Air
Adjusting Screw (27)

4. Move Spray Gun more slowly

5. Clean components

6. Spray closer to object

7. Adjust Nozzle

Spray Gun not
operating

1. Paint not thinned enough

2. Spray Gun clogged

3. Air Hose is broken

4. Air Filter clogged

5. Paint Cup not fully closed

1. Add thinner (check viscosity)

2. Clean components

3. Replace Air Hose

4. Clean or replace Air Filter

5. Close paint cup

Maintenance

Disconnect from the air source.

1. Remove the Spray Gun Cup (26).

2. Pour residual paint into the paint container and seal it.

3. Pour non-flammable paint thinner into the Plastic Cup (26). If water based paint was
used, you can use water.

4. Secure the Cup (26) 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. Make sure that both of the Vent Holes (top and bottom) are totally clear of paint and
debris before storing the Spray Gun.

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Parts List

Note: Certain parts cannot be ordered separately and must be ordered as part of an entire

set.
* (41) Air Valve Seat Set includes parts A, B, C, D, E, F, G on the diagram below.
* (39) Lid Assembly Set includes part numbers 25, 31, 44, 23, 43, 34, 22, 30, 29, 42

Part No. Description Part No. Description
1 Air Cap Set 24 Air Hose Joint
2 Nozzle 25* Copper Pin
9 Needle Valv e Spring 26 Cup
10 Copper Gasket 27 Air Adjusting Valve Set
11 Fluid Needle 29* Baffle
12 Spread Adj. Valve Set 30* Nut
13 Trigger Pin 31* Screw
15 0-ring 32 Filter
16 Needle V alve Guide 33 Air Inlet
17 Screw 34* Cup Gasket
18 Fluid Joint 38* Spare Parts
19 Fluid Adjusting Screw 39* Lid Assy. Set
20 Trigger 41* Air Valve Set
22* 0-ring 42* Material T ube Assembly
21 Air Orienting Ring 43* Cup Top Assemby
23* Lever 4 4* Yoke Assembly

THE MANUF ACTURER AND/OR DISTRIBUT OR HAS PRO VIDED THE PARTS DIA GRAM IN THIS
MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE 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 PR ODUCT OR THAT HE OR SHE
IS QUALIFIED TO REPLACE ANY PARTS OF THE PR ODUCT. IN FACT, THE MANUF A CTURER
AND/OR DISTRIBUTOR EXPRESSLY 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 REP AIRS TO THE ORIGINAL PRODUCT OR REPLA CEMENT P AR TS 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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PLEASE READ THE FOLLOWING CAREFULLY

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39

Assembly Drawing

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