Harbor Freight Tools Paint Sprayer 91772 User Manual

HVLP ELECTRIC PAINT SPRAYER  
91772  
ASSEMBLY AND OPERATING INSTRUCTIONS  
®
TO PREVENT SERIOUS INJURY,  
READ AND UNDERSTAND ALL WARNINGS  
AND INSTRUCTIONS BEFORE USE.  
3491 Mission Oaks Blvd., Camarillo, CA 93011  
Copyright 2004 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, please call 1-800-444-3353.  
 
ELECTRICAL SAFETY  
4.  
Grounded tools must be plugged into an outlet properly installed and  
grounded in accordance with all codes and ordinances. Never remove the  
grounding prong or modify the plug in any way. Do not use any adapter  
plugs. Check with a qualified electrician if you are in doubt as to whether  
the outlet is properly grounded. If the tools should electrically malfunction or  
break down, grounding provides a low resistance path to carry electricity away  
from the user.  
5.  
6.  
Double insulated tools are equipped with a polarized plug (one blade is  
wider than the other). This plug will fit in a polarized outlet only one way. If  
the plug does not fit fully in the outlet, reverse the plug. If it still does not  
fit, contact a qualified electrician to install a polarized outlet. Do not  
change the plug in any way. Double insulation  
eliminates the need for the  
three wire grounded power cord and grounded power supply system.  
Avoid body contact with grounded surfaces such as pipes, radiators,  
ranges, and refrigerators. There is an increased risk of electric shock if your  
body is grounded.  
7.  
8.  
Do not expose power tools to rain or wet conditions. Water entering a power  
tool will increase the risk of electric shock.  
Do not abuse the Power Cord. Never use the Power Cord to carry the tools  
or pull the Plug from an outlet. Keep the Power Cord away from heat, oil,  
sharp edges, or moving parts. Replace damaged Power Cords immedi-  
ately. Damaged Power Cords increase the risk of electric shock.  
9.  
When operating a power tool outside, use an outdoor extension cord  
marked “W-A” or “W”. These extension cords are rated for outdoor use, and  
reduce the risk of electric shock.  
PERSONAL SAFETY  
10.  
11.  
Stay alert. Watch what you are doing, and use common sense when oper-  
ating a power tool. Do not use a power tool while tired or under the influ-  
ence of drugs, alcohol, or medication. A moment of inattention while operat-  
ing power tools may result in serious personal injury.  
Dress properly. Do not wear loose clothing or jewelry. Contain long hair.  
Keep your hair, clothing, and gloves away from moving parts. Loose  
clothes, jewelry, or long hair can be caught in moving parts.  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 3  
 
12.  
13.  
14.  
15.  
Avoid accidental starting. Be sure the Power Switch is off before plugging  
in. Carrying power tools with your finger on the Power Switch, or plugging in  
power tools with the Power Switch on, invites accidents.  
Remove adjusting keys or wrenches before turning the power tool on. A  
wrench or a key that is left attached to a rotating part of the power tool may result  
in personal injury.  
Do not overreach. Keep proper footing and balance at all times. Proper  
footing and balance enables better control of the power tool in unexpected  
situations.  
Use safety equipment. Always wear ANSI-approved eye protection, face  
mask/respirator and protective clothing while spraying.  
TOOL USE AND CARE  
16.  
Use clamps (not included) or other practical ways to secure and support  
the workpiece to a stable platform. Holding the work by hand or against your  
body is unstable and may lead to loss of control.  
17.  
18.  
Do not force the tool. Use the correct tool for your application. The correct  
tool will do the job better and safer at the rate for which it is designed.  
Do not use the power tool if the Power Switch does not turn it on or off.  
Any tool that cannot be controlled with the Power Switch is dangerous and must  
be replaced.  
19.  
Disconnect the Power Cord Plug from the power source before making any  
adjustments, changing accessories, or storing the tool. Such preventive  
safety measures reduce the risk of starting the tool accidentally.  
20.  
21.  
22.  
Store idle tools out of reach of children and other untrained persons. Tools  
are dangerous in the hands of untrained users.  
Maintain tools with care. Keep tools clean. Do not use a damaged tool. Tag  
damaged tools “Do not use” until repaired.  
Check for misalignment or binding of moving parts, breakage of parts, and  
any other condition that may affect the tool’s operation. If damaged, have  
the tool serviced before using. Many accidents are caused by poorly main-  
tained tools.  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 4  
 
23.  
Use only accessories that are recommended by the manufacturer for your  
model. Accessories that may be suitable for one tool may become hazardous  
when used on another tool.  
SERVICE  
24.  
25.  
Tool service must be performed only by qualified repair personnel. Service  
or maintenance performed by unqualified personnel could result in a risk of injury.  
When servicing a tool, use only identical replacement parts. Follow  
instructions in the “Inspection, Maintenance, And Cleaning” section of this  
manual. Use of unauthorized parts or failure to follow maintenance instructions  
may create a risk of electric shock or injury.  
SPECIFIC SAFETY RULES  
1.  
2.  
Maintain labels and nameplates on the Sprayer. These carry important infor-  
mation. If unreadable or missing, contact Harbor Freight Tools for a replacement.  
Maintain a safe working environment. Keep the work area well lit. Make sure  
there is adequate surrounding workspace. Always keep the work area free of  
obstructions, grease, oil, trash, and other debris. Do not use a power tool in areas  
near flammable chemicals, dusts, and vapors. Do not use this product in a damp  
or wet location.  
3.  
4.  
5.  
Always keep the extension cord away from moving parts on the tool.  
Always spray in a well ventilated area to prevent health and fire hazards.  
Never spray flammable materials near open flames or ignition sources.  
Electrical arcs from motorized equipment can ignite flammable materials.  
6.  
7.  
8.  
Spray approved materials only. Never spray corrosive materials, acids, toxic  
chemicals, fertilizers, pesticides, or highly flammable materials such as gasoline,  
kerosene etc.  
Never leave the Sprayer unattended when it is plugged into an electrical  
outlet. Turn off the tool, and unplug it from its electrical outlet before  
leaving.  
Always unplug the Sprayer from its electrical outlet before performing and  
inspection, maintenance, or cleaning procedures.  
9.  
Never spray towards people or animals.  
10.  
Always mask the area surrounding the paint site to protect surrounding  
property and equipment from paint overspray.  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 5  
 
11.  
12.  
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.)  
WARNING! People with pacemakers should consult their physician(s) before  
using this product. Electromagnetic fields in close proximity to a heart pacemaker  
could cause interference to or failure of the pacemaker.  
REV 11/06  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 6  
 
GROUNDING  
WARNING!  
Improperly connecting the grounding wire can result in the risk of electric  
shock. Check with a qualified electrician if you are in doubt as to whether the  
outlet is properly grounded. Do not modify the power cord plug provided with  
the tool. Never remove the grounding prong from the plug. Do not use the  
tool if the power cord or plug is damaged. If damaged, have it repaired by  
a service facility before use. If the plug will not fit the outlet, have a proper  
outlet installed by a qualified electrician.  
GROUNDED TOOLS: TOOLS WITH THREE PRONG PLUGS  
1.  
Tools marked with “Grounding Required” have a three wire cord and three prong  
grounding plug. The plug must be connected to a properly grounded outlet. If  
the tool should electrically malfunction or break down, grounding provides a low  
resistance path to carry electricity away from the user, reducing the risk of elec-  
tric shock. (See Figure A.)  
2.  
3.  
The grounding prong in the plug is connected through the green wire inside the  
cord to the grounding system in the tool. The green wire in the cord must be the  
only wire connected to the tool’s grounding system and must never be attached  
to an electrically “live” terminal. (See Figure A.)  
Your tool must be plugged into an appropriate outlet, properly installed and  
grounded in accordance with all codes and ordinances. The plug and outlet  
should look like those in the following illustration. (See Figure A.)  
FIGURE A  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 7  
 
DOUBLE INSULATED TOOLS: TOOLS WITH TWO PRONG PLUGS  
4.  
5.  
Tools marked “Double Insulated” do not require grounding. They have a special  
double insulation system which satisfies OSHA requirements and complies with  
the applicable standards of Underwriters Laboratories, Inc., the Canadian  
Standard Association, and the National Electrical Code. (See Figure B.)  
Double insulated tools may be used in either of the 120 volt outlets shown in the  
following illustration. (See Figure B.)  
FIGURE B  
EXTENSION CORDS  
1.  
2.  
Grounded tools require a three wire extension cord. Double Insulated tools  
can use either a two or three wire extension cord.  
As the distance from the supply outlet increases, you must use a heavier gauge  
extension cord. Using extension cords with inadequately sized wire causes a  
serious drop in voltage, resulting in loss of power and possible tool damage.  
(See Figure C, next page.)  
3.  
4.  
5.  
The smaller the gauge number of the wire, the greater the capacity of the cord.  
For example, a 14 gauge cord can carry a higher current than a 16 gauge cord.  
(See Figure C.)  
When using more than one extension cord to make up the total length, make  
sure each cord contains at least the minimum wire size required.  
(See Figure C.)  
If you are using one extension cord for more than one tool, add the nameplate  
amperes and use the sum to determine the required minimum cord size.  
(See Figure C.)  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 8  
 
6.  
7.  
If you are using an extension cord outdoors, make sure it is marked with the  
suffix “W-A” (“W” in Canada) to indicate it is acceptable for outdoor use.  
Make sure your extension cord is properly wired and in good electrical condition.  
Always replace a damaged extension cord or have it repaired by a qualified  
electrician before using it.  
8.  
Protect your extension cords from sharp objects, excessive heat, and damp or  
wet areas.  
RECOMMENDED MINIMUM WIRE GAUGE FOR EXTENSION CORDS*  
(120 VOLT)  
NAMEPLATE  
AMPERES  
(At Full Load)  
EXTENSION CORD LENGTH  
25 FEET  
50 FEET  
75 FEET  
100 FEET  
150 FEET  
0 - 2.0  
18  
18  
18  
18  
16  
14  
12  
18  
18  
18  
16  
14  
12  
10  
16  
16  
16  
14  
12  
10  
-
16  
14  
14  
12  
10  
-
16  
14  
12  
12  
-
-
-
2.1 - 3.4  
3.5 - 5.0  
5.1 - 7.0  
7.1 - 12.0  
12.1 - 16.0  
16.1 - 20.0  
-
*Based on limiting the line voltage drop  
to five volts at 150% of the rated amperes.  
FIGURE C  
SYMBOLOGY  
Double Insulated  
Canadian Standards  
Association  
Underwriters  
Laboratories, Inc.  
Volts Alternating Current  
V ~  
Amperes  
A
n
No Load Revolutions  
per Minute (RPM)  
o
xxxx/min.  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 9  
 
UNPACKING  
When unpacking, check to make sure all the parts shown on the Parts List on page 14  
are included. If any parts are missing or broken, please call Harbor Freight Tools at the  
number shown on the cover of this manual as soon as possible.  
ASSEMBLY AND OPERATING INSTRUCTIONS  
NOTE: For additional information regarding the parts listed in the following pages, refer  
to the Assembly Diagram on page 15.  
CAUTION: Always make sure the Power Cord of the Sprayer is unplugged from  
its electrical outlet prior to making any adjustments to the tool.  
FIGURE 1  
Paint Cup (24)  
Cup Cover (19)  
Gun Body (27)  
Strap (28)  
Motor Unit  
Spiral Air Hose (46)  
Viscosity Cup (33)  
Inflator (32)  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 10  
 
ASSEMBLY AND OPERATING INSTRUCTIONS (continued)  
Refer to the Assembly Drawing on page 15 and FIGURE 1 on page 10.  
Checking the Paint Viscosity  
When using a HVLP (low pressure and high volume) spray gun the paint must be  
thinned to the proper viscosity. Viscosity indicates whether the material is very liquid  
(low viscosity) versus very thick (high viscosity). Viscosity is measured in the seconds it  
takes for the paint to flow through the viscosity meter (DINs). Ask your paint sales repre-  
sentative, check the paint container, or contact the manufacturer to find the paint’s  
viscosity value.  
Note: For use only with paints, never use textures or other materials. This Sprayer  
can use paints with viscosity values between 10 to 14 DINs. Most commonly used  
paints fall within this range and will not need to be thinned. Always check the viscosity  
of the material before using it in this Spray Gun.  
To measure the viscosity of your paint, you will need the Viscosity Cup (33), a  
small container, and a timepiece with a second hand. Fill the Viscosity Cup (33) with  
paint (holding it over the container), and immediately begin to time how long it takes the  
Viscosity Cup (33) to empty. The time it takes to empty the Viscosity Cup (33) is the  
viscosity of the paint. If the paint is outside of the range (10-14 DINs), take the appropri-  
ate measures to thin it (see manufacturer’s instructions).  
Preparing the Object to be Painted.  
1.  
Thoroughly clean the object or area that you are painting. Remove any old paint,  
scaling, or rust from the surface.  
2.  
3.  
If necessary, make the surface smooth (using sandpaper).  
Read the instructions on the paint can to determine whether or not you need to  
apply a fixative/adhesive to the surface to save paint.  
Preparing the Spray Gun  
1.  
After making sure the paint is the proper viscosity, thoroughly mix the paint.  
2.  
Remove the Cup Cover (19) (twist counterclockwise) and fill the Paint Cup (24) to  
just below the top.  
3.  
4.  
Replace the Cup Cover (19). Twist clockwise.  
Connect the Spray Gun to the Spiral Air Hose (46) by snapping it into place. All  
connections snap into place as illustrated in FIGURE 2 below.  
Motor Unit  
FIGURE 2  
FIGURE 3  
Attaching Gun Tray  
Gun Tray (41)  
Spiral Air Hose (46)  
Spray Gun or Inflator  
REV 11/056  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 11  
 
ASSEMBLY AND OPERATING INSTRUCTIONS (continued)  
5.  
6.  
Secure the Spray Gun in the Gun Tray (41). If the Gun Tray (41) is not attached to the  
Motor Unit, attach it as shown in FIGURE 3 on page 11.  
To adjust the type of spray required, loosen the Lock Ring (17) and rotate the Fluid  
Tip (16) for a horizontal, vertical, or round spray. Practice spraying on scrap mate-  
rial to get the feel of the adjustments. When finished, tighten the Lock Ring (17).  
Note: Horizontal and vertical sprays are recommended for larger surfaces, and  
round sprays are used for small objects or difficult to reach areas.  
7.  
8.  
9.  
10.  
Plug in the unit.  
Switch (31)  
FIGURE 4  
Place the Strap (28) over you shoulder.  
Turn on the Switch (31). See FIGURE 4.  
Pointing the Spray Gun at scrap material for prac-  
tice, gently squeeze the Trigger (25) to begin  
spraying.  
11.  
To adjust the paint flow, turn the Fluid Needle  
Screw (1) while pulling the Trigger (25), until the correct flow is obtained.  
Note: Never cover the Vent (18), and never hold the Spray Gun upside down.Covering the  
vent will halt paint flow, and holding the Spray Gun upside down will spill out paint.  
12.  
The Spray Gun should be moved with a regular motion, keeping a consistent dis-  
tance from the object. The Spray Gun must always be parallel to the surface of the  
object being painted. Let go of the Trigger (25) after each pass.  
Note: Avoid circular motions as they may damage the finish of the surface.  
13. When you are finished, release the Trigger (25) and turn off the Switch (31).  
Warning! Air may still be in the Spiral Air Hose (46) after turning off the unit. Always point  
the unit at scrap material or into a bucket and fire the unit after turning it off.  
Troubleshooting  
Cause  
Solution  
Problem  
-product too diluted  
- spray adjustment  
-slow sprayer movement  
- clogged gun  
- add undiluted product  
- reduce paint flow  
- faster sprayer movement  
- let go of Trigger when reversing  
- increase distance between gun and  
object  
The Paint Drips on  
object to be painted  
- distance problem  
-product too diluted  
- spray adjustment  
-fast movement  
- gun clogged  
- add undiluted product  
- increase paint flow  
- move slower  
- clean gun  
- increase distance between  
gun and object  
Weak or irregular spray  
No Paint Coverage  
- gun distance  
-product not diluted enough  
- paint too thick  
- gun clogged  
- add thinner  
- check viscosity and adjust  
- clean gun  
- hose broken  
- replace hose  
- Filter (30) clogged  
- Grainy paint  
- Cup Cover (19) not closed  
- replace filter  
- filter paint through cheesecloth  
- tightly close Cup Cover (19)  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 12  
 
Note: A small Inflator (32) accessory comes with this unit. To fill a raft or air mattress,  
attach the inflator as shown in FIGURE 2 on page 11. When the inflator is attached to  
the object being inflated, start the unit using the Switch (31). Turn off the unit when the  
object is inflated. Read the instruction manual of the object to be inflated to  
determine the recommended and maximum PSI for filling the object. You will have  
to check the air pressure of the object by using a separate air pressure gauge (not  
included). Do not overinflate. Overinflating may cause the object to explode.  
INSPECTION, MAINTENANCE, AND CLEANING  
1.  
2.  
WARNING! Make sure the Power Switch (31) of the Motor Unit is in its  
“OFF” position and that the tool is unplugged from its electrical outlet before  
performing any inspection, maintenance, or cleaning procedures.  
BEFORE EACH USE, inspect the general condition of the Sprayer. Check for  
loose screws, misalignment or binding of moving parts, cracked or broken parts,  
damaged electrical wiring, and any other condition that may affect its safe opera-  
tion. If abnormal noise or vibration occurs, have the problem corrected before  
further use. Do not use damaged equipment.  
3.  
4.  
After each use, clean the gun immediately. Open the Cup Cover (19) and  
remove the Paint Cup (24). Replace left over paint in its container and seal the  
container. Pour small amounts of thinner into the Paint Cup (24) and replace the  
Cup Cover (19). Fire the Spray Gun into a paint waste receptacle until the thin-  
ner comes out completely clean. Repeat if necessary. Clean off any trace of  
paint from the Spray Gun. Clean off the Gasket (20) that is under the Cup Cover  
(19).  
Clean the Fluid Nozzle (15) and the Fluid Needle (4). First, unlock and remove  
the Lock Ring (17), and Fluid Tip (16). Completely loosen the Fluid Needle Screw  
(1). Remove the Needle Spring (2) and push out the Fluid Needle (4). Do not  
use tools as they will bend the part. Put the parts in a container with thinner and  
clean them. Replace them in the proper order. Refer to the Assembly Drawing  
on page 15.  
5.  
6.  
Run water through the Spiral Air Hose (46) making sure it is clean inside. Discon-  
nect the Spiral Air Hose from spray gun or inflator and the motor unit, then allow it  
to dry before reassembly.  
Make sure the Gasket (20) on the Paint Cup (24) is not torn or broken. If it is,  
replace it immediately. Always make sure the Gasket (20) is on correctly.  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 13  
 
PARTS LIST  
Part  
1
2
3
4
5
6
7
8
Description  
Fluid Needle Screw  
Needle Spring  
Washer  
Fluid Needle  
Needle Cover  
Needle SealingThread  
Gasket  
Bolt  
Plug  
Washer  
Pin  
Qty.  
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Part  
Description  
Paint Cup  
Trigger  
Handle O-ring  
Gun Body  
Strap  
Exhaust Cover  
Filter  
Switch  
Inflator  
Viscosity Cup  
Cord  
Qty.  
1
1
2
1
1
1
1
2
1
1
1
1
1
1
8
1
7
1
1
1
1
1
1
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
Washer  
Pin Board  
SealingThread Head  
Sealing Ring Head  
Fluid Nozzle  
FluidTip  
Lock Ring  
Vent  
Cup Cover  
Gasket  
Inner Cover  
HexThread  
MaterialTube  
FrontTurbine Shell Pin  
Back Turbine Shell Pin  
FixedTurbine Pin  
LeftTurbine Shell  
Pad  
GunTray  
Turbine O-ring  
Turbine  
RightTurbine Shell  
Combined Gun Body  
Spiral Air Hose  
PLEASE READ THE FOLLOWING CAREFULLY  
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY  
DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR  
DISTRIBUTOR 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.  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 14  
 
ASSEMBLY DIAGRAM  
NOTE: Some parts are listed and shown for illustration purposes only, and are not  
available individually as replacement parts.  
SKU 91772  
For technical questions, please call 1-800-444-3353.  
Page 15  
 

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