Bauer 21508C-B Assembly instructions

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For Longer Run-Time,
Use 3.0 Amp Hour
Battery Or Greater
(Sold Separately)
Battery and Charger
Sold Separately
RETURNS NOT
ACCEPTED &
WARRANTY VOID
if Sprayer is not properly
cleaned and lubricated
immediately after every use.
Clean and Lubricate Sprayer
immediately after use to
prevent permanent damage.
Owner’s Manual & Safety Instructions
Save This Manual Keep this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the
back of the manual near the assembly diagram (or month and year of purchase if product has no number).
Keep this manual and the receipt in a safe and dry place for future reference. 22a
When unpacking, make sure that the product is intact
and undamaged. If any parts are missing or broken,
please call 1-888-866-5797 as soon as possible.
Copyright©2021 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.
Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein.
Tools required for assembly and service may not be included.
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

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RETURNS NOT ACCEPTED & WARRANTY VOID
if Sprayer is not properly cleaned and lubricated immediately after every use.
Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETY OPERATION MAINTENANCESETUP
Table of Contents
Safety .......................................................................2
Specifications ...........................................................8
Setup ........................................................................9
Operation.................................................................10
Maintenance............................................................14
Parts List and Diagram............................................22
Warranty ..................................................................24
WARNING SYMBOLS AND DEFINITIONS
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that
follow this symbol to avoid possible injury or death.
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
Addresses practices not related to personal injury.
IMPORTANT SAFETY INSTRUCTIONS
1. SAVE THESE INSTRUCTIONS – To reduce the
risks of fire or explosion, electrical shock, and
the injury to persons, read and understand all
instructions included in this manual. Be familiar with
the controls and the proper usage of the equipment.
2. WARNING – To reduce the risk of fire or explosion:
a. Do not spray flammable or combustible
materials near an open flame or
sources of ignition such as cigarettes,
motors, and electrical equipment.
b. For units intended for use with only
water-based or mineral spirit-type materials
with a minimum flash point of 38°C (100°F)
– Do not spray or clean with liquids having
a flash point less than 38°C (100°F).
c. Paint or solvent flowing through the equipment is
able to result in static electricity. Static electricity
creates a risk of fire or explosion in the presence
of paint or solvent fumes. All parts of the
spray system, including objects in and around
the spray area shall be properly grounded to
protect against static discharge and sparks.
d. Verify that all containers and collection systems
are grounded to prevent static discharge.
e. Do not use a paint or a solvent
containing halogenated hydrocarbons.
See operating instructions for examples
of these types of materials.
f. Keep spray area well ventilated. Keep a good
supply of fresh air moving through the area.
Keep pump assembly in a well ventilated area.
g. Do not smoke in the spray area.
h. Do not operate light switches, engines, or similar
spark producing products in the spray area.
i. Keep area clean and free of paint or solvent
containers, rags, and other flammable materials.
j. Know the contents of the paints and solvents
being sprayed. Read all Material Safety Data
Sheets (MSDS) and container labels provided
with the paints and solvents. Follow the paint
and solvent manufacturerʼs safety instructions.
k. Fire extinguisher equipment shall
be present and working.

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Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETYOPERATIONMAINTENANCE SETUP
3. WARNING – To reduce the risk of skin injection:
a. Do not aim the gun at, or spray
any person or animal.
b. Keep hands and other body parts away
from the discharge. For example, do not try
to stop leaks with any part of the body.
c. Always use the nozzle tip guard. Do not
spray without nozzle tip guard in place.
d. Only use a nozzle tip specified
by the manufacturer.
e. Use caution when cleaning and changing nozzle
tips. In the case where the nozzle tip clogs while
spraying, follow the manufacturerʼs instructions
for turning off the unit and relieving the pressure
before removing the nozzle tip to clean.
f. Do not leave the unit energized or under
pressure while unattended. When the
unit is not in use, turn off the unit and
relieve the pressure in accordance with
the manufacturerʼs instructions.
g. High-pressure spray is able to inject toxins
into the body and cause serious bodily
injury. In the event that injection occurs,
seek medical attention immediately.
h. This system is capable of producing 2000 psi.
Only use replacement parts or accessories
that are specified by the manufacturer and
that are rated a minimum of 2000 psi.
i. Always engage the trigger lock
when not spraying. Verify the trigger
lock is functioning properly.
j. Verify that all connections are secure
before operating the unit.
k. Know how to stop the unit and bleed pressure
quickly. Be thoroughly familiar with the controls.
4. WARNING – To reduce the risk of injury:
a. Always wear appropriate gloves, eye protection,
and a respirator or mask when painting.
b. Do not operate or spray near children. Keep
children away from equipment at all times.
c. Do not overreach or stand on an
unstable support. Keep effective
footing and balance at all times.
d. Stay alert and watch what you are doing.
e. Do not operate the unit when fatigued or
under the influence of drugs or alcohol.
Work Area
1. Keep the work area clean and well lighted.
Cluttered benches and dark areas increase the
risks of electric shock, fire, and injury to persons.
2. Operate only in a well-ventilated area.
Paint thinners and solvents may
be harmful if inhaled.
3. Do not operate the sprayer in explosive
atmospheres, such as in the presence of
flammable liquids, gases, or dust.
The sprayer is able to create sparks resulting
in the ignition of the dust or fumes.
4. Keep bystanders, children, and visitors away
while operating the tool. Distractions are
able to result in the loss of control of the tool.
Electrical Safety
1. 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.
2. Do not expose sprayers to rain or wet
conditions. Water entering a sprayer will
increase the risk of electric shock.

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if Sprayer is not properly cleaned and lubricated immediately after every use.
Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETY OPERATION MAINTENANCESETUP
Personal Safety
1. Stay alert. Watch what you are doing and
use common sense when operating the tool.
Do not use the tool while tired or under the
influence of drugs, alcohol, or medication.
A moment of inattention while operating the
tool increases the risk of injury to persons.
2. Dress properly. Do not wear loose clothing
or jewelry. Contain long hair. Keep hair,
clothing, and gloves away from moving parts.
Loose clothes, jewelry, or long hair increases
the risk of injury to persons as a result
of being caught in moving parts.
3. Avoid unintentional starting. Be sure the
trigger is off before connecting to the
power supply. Do not carry the sprayer with
your finger on the trigger or connect the sprayer
to the power supply with the trigger on.
4. Do not overreach. Keep proper
footing and balance at all times.
Proper footing and balance enables better
control of the tool in unexpected situations.
5. Use safety equipment.
Wear protective paint spraying
gloves and a NIOSH-approved
respirator during use.
Non-skid safety shoes and a hard
hat must be used for the applicable conditions.
6. Always wear eye protection.
Wear ANSI-approved safety goggles.
Tool Use and Care
1. Do not force the tool. Use the correct tool
for the application. The correct tool will do the job
better and safer at the rate for which
it was designed.
2. Do not use the sprayer if the switch does
not turn it on and off. Any sprayer that cannot
be controlled with the switch is dangerous and
must be repaired.
3. Disconnect the tool 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 unintentionally.
4. Store the tool when it is idle out of reach
of children and other untrained persons.
A tool is dangerous in the hands of untrained users.
5. Check for misalignment or binding of
moving parts, breakage of parts, and any
other condition that affects the tool’s
operation. If damaged, have the tool
serviced before using. Many accidents are
caused by poorly maintained tools. There is
a risk of bursting if the tool is damaged.
6. Use only accessories that are identified by the
manufacturer for the specific tool model. Use of
an accessory not intended for use with the specific
tool model, increases the risk of injury to persons.
Service
1. Tool service must be performed only
by qualified repair personnel.
2. When servicing a tool, use only identical
replacement parts. Use only authorized parts.
3. Use only lubricants supplied with the
tool or specified by the manufacturer.

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SAFETYOPERATIONMAINTENANCE SETUP
Specific Safety Instructions
1. INJECTION HAZARD!
Although this paint gun is airless,
it still puts out paint at a very high
pressure. Through improper
use, paint can be injected through a person’s
skin, leading to serious injury, possibly
amputation. If paint is accidentally injected into
someone’s skin, contact a doctor immediately.
Do not treat an injection injury as a simple
cut. Injection can lead to amputation and
requires immediate surgical treatment.
2. Do not direct spray at people or animals. Do
not place your hand in front of Spray Gun’s
nozzle or attempt to deflect paint spray
with your hand during use. Gloves and
clothing don’t offer adequate protection
from toxic paints, sealers, or stains.
3. Do not spray flammable materials in vicinity
of open flame or near ignition sources.
Motors, electrical equipment, and controls
can cause electrical arcs that will ignite a
flammable gas or vapor. Do not store flammable
liquids or gases in vicinity of this unit.
4. Do not leave Paint Sprayer pressurized
while unattended.
5. Keep the trigger and battery
clean and paint-free.
6. Do not run Paint Sprayer while empty.
Damage to the unit may occur.
7. Do not use Paint Sprayer to spray
asbestos, metallic paints, glazes, red lead,
cement, ground chalk, abrasive grainy
paints containing lime, or bleach.
These will damage the spray gun
and void the warranty.
8. Read all of the information concerning coating
products and cleaning solvents. Do NOT use
bleach, low-flash naphthalene, acetone, alcohol or
toluene when cleaning Paint Sprayer equipment.
9. Do not use bleach or halogenated hydrocarbon
solvents (DCM, 1,1,1– trichloroethane, methyl
bromine, carbon tetrachloride, and ethyl iodide).
Long term exposure to many chlorinated
hydrocarbons through inhalation can result in liver
and kidney toxicity. Exposure of unprotected skin
to the solvents used can cause defatting of the
skin resulting in dermatitis. Methylene chloride
and vinyl chloride have also been shown to be
human carcinogens. Some of these solvents are
flammable. Welding operations near the these
materials can create phosgene, a highly toxic gas.
10. Many spray guns contain aluminum,
which reacts strongly to chlorinated solvents.
Contact the solvent or coating manufacturer as
needed regarding potential chemical reactions.
11. Industrial applications must follow
OSHA requirements.
12. Spraying hazardous materials may result in serious
injury or death. Do not spray pesticide, acid,
corrosive material, fertilizer, or toxic chemicals.
13. Paints and solvents may be harmful or fatal if
swallowed or inhaled. Avoid prolonged skin
contact with solvents or paints as they will
irritate skin. After any contact, immediately
wash off exposed area with hot, soapy water.
14. When flushing Paint Sprayer system,
use lowest possible pressure setting.
15. All spray gun accessories used with Paint Sprayer
must be pressure rated at or above 2000 PSI.
16. Use caution while spraying on windy days.
17. Do not use Paint Sprayer without the
Spray Gun’s nozzle guard in place.
18. Paint Sprayer’s housing may become
hot during use. Do not touch housing
until it has completely cooled.
19. Remove Spray Tip or turn to cleaning
position BEFORE cleaning or
flushing Paint Sprayer system.
20. Do not use pliers to tighten or loosen
high pressure connections.

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Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETY OPERATION MAINTENANCESETUP
21. Sparks from improper grounding
can ignite fumes!
Follow all local regulations regarding
the use of fluid supply containers and
solvent pails used with flushing the Paint Sprayer.
Use only conductive metal pails placed on a
grounded (concrete) surface. Do not place pails
on nonconductive surfaces (such as cardboard or
paper). Ground all metal pails by clamping one end
of a ground wire to the pail and the other end to a
grounded structure (such as a nearby pipe).
Maintain grounding, even when flushing or relieving
pressure from Paint Sprayer into metal pail.
The force of the spray can knock a metal pail over,
so hold down the metal pail and keep the metal
part of the spray gun set against the grounded
metal pail when pressing the spray gun trigger.
22. Maintain labels and nameplates on the sprayer.
These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
23. People with pacemakers should consult their
physician(s) before use. Electromagnetic fields in
close proximity to heart pacemaker could cause
pacemaker interference or pacemaker failure.
Battery tool use and care
1. Prevent unintentional starting. Ensure the
switch is in the off-position before connecting
to battery pack, picking up or carrying the
power tool. Carrying the power tool with your
finger on the switch or energizing power tool
that have the switch on invites accidents.
2. Disconnect the battery pack from the power
tool before making any adjustments, changing
accessories, or storing power tool. Such
preventive safety measures reduce the risk
of starting the power tool accidentally.
3. Recharge only with the charger specified by
the manufacturer. A charger that is suitable for
one type of battery pack may create a risk of
fire when used with another battery pack.
4. Use power tools only with specifically designated
battery packs. Use of any other battery
packs may create a risk of injury and fire.
5. When battery pack is not in use, keep it away
from other metal objects, like paper clips,
coins, keys, nails, screws or other small metal
objects, that can make a connection from
one terminal to another. Shorting the battery
terminals together may cause burns or a fire.
6. Under abusive conditions, liquid may be
ejected from the battery; avoid contact.
If contact accidentally occurs, flush with
water. If liquid contacts eyes, additionally
seek medical help. Liquid ejected from the
battery may cause irritation or burns.
7. Do not use a battery pack or power tool that is
damaged or modified. Damaged or modified
batteries may exhibit unpredictable behavior
resulting in fire, explosion or risk of injury.
8. Do not expose a battery pack or power tool to
fire or excessive temperature. Exposure to fire or
temperature above 265°F may cause explosion.
9. Follow all charging instructions and do not charge
the battery pack or power tool outside of the
temperature range specified in the instructions.
Charging improperly or at temperatures
outside of the specified range may damage
the battery and increase the risk of fire.
10. Have servicing performed by a qualified
repair person using only identical
replacement parts. This will ensure that
the safety of the product is maintained.
11. Do not modify or attempt to repair the power
tool or the battery pack except as indicated
in the instructions for use and care.
12. The battery Charger gets hot during
use. The Charger’s heat can build up to
unsafe levels and create a fire hazard if
it does not receive adequate ventilation,
due to an electrical fault, or if it is used in a
hot environment. Do not place the Charger on a
flammable surface. Do not obstruct any vents on
the Charger. Especially avoid placing the
Charger on carpets and rugs; they are not only
flammable, but they also obstruct vents under
the Charger. Place the Charger on a stable, solid,
nonflammable surface (such as a stable metal
workbench or concrete floor) at least 1 foot away
from all flammable objects, such as drapes or walls.
Keep a fire extinguisher and a smoke detector in
the area. Frequently monitor the Charger and
Battery Pack while charging.

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Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETYOPERATIONMAINTENANCE SETUP
Lithium Battery Safety Warnings
LITHIUM BATTERIES STORE
A LARGE AMOUNT OF ENERGY AND
WILL VENT FIRE OR EXPLODE
IF MISTREATED:
1. Keep Battery Pack dry.
2. DO NOT DO ANY OF THE FOLLOWING
TO THE BATTERY PACK:
• Open,
• Drop,
• Short-circuit,
• Puncture,
• Incinerate, or
• Expose to temperatures
greater than 265°F.
3. Charge Battery Pack only according
to its Charger’s instructions.
4. Inspect Battery Pack before every use;
do not use or charge if damaged.
SAVE THESE INSTRUCTIONS.
Grounding
TO PREVENT ELECTRIC SHOCK AND DEATH FROM INCORRECT GROUNDING:
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 charger. Do not use the
charger 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.
Extension Cords
Note: Extension cords must not be used with this item’s Charger.

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SAFETY OPERATION MAINTENANCESETUP
Specifications
Maximum Working Pressure 2000 PSI
Battery (Sold Separately) Bauer 20V Li-Ion 64816
Charger (Sold Separately) Bauer 20V Li-Ion 57006
TIP CHART
Tip Size Material Type
312 Thin to Medium Viscosity
514 Medium to Thick Viscosity
Symbology
Symbol Property or Statement
VVolts
Direct Current
AAmperes
PSI Pounds per square inch of pressure
CFM Cubic Feet per Minute flow
SCFM Cubic Feet per Minute flow
at standard conditions
NPT National pipe thread, tapered
NPS National pipe thread, straight
Symbol Property or Statement
WARNING marking concerning
Risk of Eye Injury.
Wear ANSI-approved
eye protection.
WARNING marking concerning
Risk of Respiratory Injury.
Wear NIOSH-approved respirator.
WARNING marking concerning
Risk of Explosion.
WARNING marking concerning
Risk of Injection Injury.
Do not direct spray at hands
or body. Have injection injury
treated immediately.
WARNING marking concerning
Risk of Fire.
Do not use solvents improperly.

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SAFETYOPERATIONMAINTENANCE SETUP
Setup – Before Use
Read the ENTIRE IMPORTANT SAFETY INFORMATION section
at the beginning of this manual including all text under subheadings therein
before set up or use of this product.
Note: For additional information regarding the parts listed in the following pages,
refer to the Assembly Diagram near the end of this manual.
Components and Controls
Cup Support
Adapter
(for larger
batteries)
Trigger
Cup
Liner
Paint
Cup
Prime/
Spray
Valve
Nozzle
Guard
Spray
Tip
Air Bleed
Valve
Trigger
Lock
Speed Switch
Connecting Shoulder Strap
1. Feed one end of Strap though the
Front Bracket and then through the Buckle.
2. Feed the other end of Strap through the
Rear Bracket and then through the Buckle, pulling
Strap until the desired length is achieved.
Front Bracket
Rear
Bracket
Shoulder
Strap
Buckle

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Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETY OPERATION MAINTENANCESETUP
Operating Instructions
Read the ENTIRE IMPORTANT SAFETY INFORMATION section
at the beginning of this manual including all text under subheadings therein
before set up or use of this product.
INJECTION HAZARD!
Although this paint gun is airless, it still puts out paint at a very high pressure. Through
improper use, paint can be injected through a person’s skin, leading to serious injury,
possibly amputation. If paint is accidentally injected into someone’s skin, contact a doctor
immediately. Do not treat an injection injury as a simple cut. Injection can lead to amputation and
requires immediate surgical treatment. Inspect tool before use, looking for damaged, loose, and
missing parts. If any problems are found, do not use tool until repaired.
Charging
Charge battery after unpacking and before using this tool. Follow instructions included with battery charger.
Lock/Unlock Trigger
WARNING! TO PREVENT SERIOUS INJURY: Risk of Injection
- Set Trigger Lock when Spray Gun not in use.
1. Push Trigger Lock to the right to lock Trigger.
2. Push Trigger Lock to the left to unlock Trigger.
Trigger
Lock
Trigger
Depressurize Sprayer
WARNING! TO PREVENT SERIOUS INJURY: Risk of Injection - Unit maintains pressure after
shut-down - Before servicing, cleaning, or removing any part, shut off power and relieve pressure.
Refer to this section when instructed to depressurize sprayer.
1. Lock Trigger.
2. Remove Battery.
3. Open Prime/Spray Valve.
4. Close Prime/Spray Valve.
Prime/Spray
Valve

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SAFETYOPERATIONMAINTENANCE SETUP
TO PREVENT SERIOUS INJURY:
Do not spray flammable or combustible liquids in a confined area. Spray area must be well
ventilated. Do not smoke while spraying or spray where sparks or flame is present.
Do not use bleach or halogenated hydrocarbon solvents (DCM, 1,1,1– trichloroethane, methyl
bromine, carbon tetrachloride, and ethyl iodide). Long term exposure to many chlorinated
hydrocarbons through inhalation can result in liver and kidney toxicity. Exposure of unprotected
skin to the solvents used can cause defatting of the skin resulting in dermatitis. Methylene chloride
and vinyl chloride have also been shown to be human carcinogens. Some of these solvents are
flammable. Welding operations near the these materials can create phosgene, a highly toxic gas.
Wear ANSI-approved safety goggles, NIOSH-approved respirator, and heavy-duty work gloves during use.
Before First Use - Pre-Cleaning
WARNING! TO PREVENT SERIOUS INJURY: Only water-based materials
or materials with a minimum flash point of 38°C (100°F) should be used for
spraying and cleaning. Only use mineral spirits for pre-cleaning.
Fluid used to test Sprayer before shipping must be flushed out before first use.
1. Lock Trigger and remove battery.
WARNING! TO PREVENT SERIOUS INJURY: TO
PREVENT FIRE: When using mineral spirits, use
only conductive metal pails placed on a grounded
(concrete) surface. DO NOT use plastic containers.
CAUTION! To prevent high pressure solvent or
paint splatter, remove Nozzle Guard and Spray Tip.
2. Designate 1 gallon container for waste.
3. Remove Paint Cup.
4. Insert clean Cup Liner.
5. Fill Cup Liner a quarter-full with mineral spirits.
6. Replace Paint Cup.
7. Open Air Bleed Valve, squeeze Liner until
reservoir inside Air Hole is filled with mineral spirits.
Air Bleed
Valve
Air
Hole
8. Close Air Bleed Valve.
9. Attach battery and unlock Trigger.
10. Prime:
a. Open Prime/Spray Valve.
b. Turn Sprayer upside-down, press
Trigger for 2 seconds.
c. Close Prime/Spray Valve.
11. Clean Sprayer:
a. Turn Sprayer upside-down, pointing into waste
container, press Trigger until solvent is gone.
Hold Spray Valve against edge of grounded
metal waste container to ground Spray Gun.
Waste
b. Refill Cup Liner with solvent and repeat cleaning
process as necessary until solvent is clear.
c. Lock Trigger and remove battery.
d. Remove Paint Cup and let parts dry completely.
NOTE: Dispose of solvent, paint and waste
according to local hazardous waste standards.

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SAFETY OPERATION MAINTENANCESETUP
Cup Support Adapter
To prevent tipping when using large battery, attach
Cup Support Adapter to bottom of Paint Cup.
Filling Paint Cup
WARNING! TO PREVENT SERIOUS INJURY: Only water-based materials or materials with
a minimum flash point of 38°C (100°F) should be used for spraying and cleaning. Only use
water or mineral spirits for cleaning. Only use water-based or oil-based paint for spraying.
1. Remove Paint Cup and insert clean Cup Liner.
2. Pour paint into Cup Liner.
3. Replace Paint Cup, tighten securely.
4. Open Air Bleed Valve, squeeze Liner until
reservoir inside Air Hole is filled with paint.
5. Close Air Bleed Valve. Air Bleed
Valve
Air
Hole
6. Spray according to Spraying on page 13.
NOTE: Dispose of solvent, paint and waste
according to local hazardous waste standards.
Cup
Support
Adapter
Paint
Cup

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SAFETYOPERATIONMAINTENANCE SETUP
Spraying
WARNING! TO PREVENT SERIOUS INJURY: Only water-based materials or materials with
a minimum flash point of 38°C (100°F) should be used for spraying and cleaning. Only use
water or mineral spirits for cleaning. Only use water-based or oil-based paint for spraying.
Proper Spraying Techniques
Keep the Spray Gun upright and
at a right angle to the workpiece.
Correct Incorrect
Correct Gun Angle
Move your arm, not just your wrist. Point gun directly towards
the surface and maintain an even, steady distance and speed.
Incorrect
Gun
Angle Do not pivot your wrist or
wave the gun like a fan.
To Avoid Paint Build Up:
Apply two thin coats rather than one thick
coat. Overlap 1/3 to 1/2 on second coat.
Start moving the Spray Gun before
fully depressing Trigger.
Fully depress Trigger before
contacting the workpiece.
When finished with the stroke, release the
Trigger while still moving the Spray Gun
and after passing the workpiece.
Note: Remove or cover objects to protect
from overspray and paint mist.
1. Attach Nozzle Guard and Spray Tip according to
Spray Tip and Nozzle Guard on page 17.
2. Lock Trigger
3. Attach battery.
4. Set Speed Switch to Ifor low pressure
or II for high pressure.
5. Open Prime/Spray Valve, press Trigger
for 3 seconds to prime Sprayer.
6. Close Prime/Spray Valve.
Note: Practice painting techniques
on a scrap workpiece.
7. Point Spray Gun:
a. 514 Tip: 10" - 12" away from workpiece.
b. 312 Tip: 8" - 10" away from workpiece.
8. Unlock and press Trigger fully, spraying
following “Proper Spraying Techniques”
and “To Avoid Paint Build Up”.
9. If no paint comes out, unplug Sprayer
and remove air according to Filling
Paint Cup, 4 & 5 on page 12.
10. When finished spraying, clean and lubricate
immediately according to After Every
Use - Cleaning on page 14.
Clearing Spray Tip Blockage
a. Lock Trigger.
b. Open Prime/Spray Valve.
c. Reverse Spray Tip to CLEAN position.
d. Close Prime/Spray Valve.
e. Unlock Trigger and spray on scrap workpiece.
f. Release and lock Trigger.
g. Reverse Spray Tip to SPRAY position.
Note: If Spray Tip won’t clear, replace according
to Spray Tip and Nozzle Guard on page 17.
NOTE: Dispose of solvent, paint and waste
according to local hazardous waste standards.

Page 14 For technical questions, please call 1-888-866-5797. Item 58520
RETURNS NOT ACCEPTED & WARRANTY VOID
if Sprayer is not properly cleaned and lubricated immediately after every use.
Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETY OPERATION MAINTENANCESETUP
Accessories and Replacement Parts
Accessories
Accessories are available at Harbor Freight stores and at http://www.harborfreight.com.
Storage Fluid
312 Spray Tip
514 Spray Tip
Cup Liner
Nozzle Guard
Repair and Service Parts
Parts are available by calling 1-888-866-5797 or emailing [email protected].
Prime/Spray Valve Repair Kit
Outlet Repair Kit
Cup Support Adaptor
Paint Filter
Air Bleed Valve
User-Maintenance Instructions
After Every Use - Cleaning
WARNING! TO PREVENT SERIOUS INJURY: Only water-based materials or materials with
a minimum flash point of 38°C (100°F) should be used for spraying and cleaning. Only use
water or mineral spirits for cleaning. Only use water-based or oil-based paint for spraying.
1. Lock Trigger and remove battery.
2. Depressurize Sprayer according to
Depressurize Sprayer on page 10.
WARNING! TO PREVENT SERIOUS INJURY: TO
PREVENT FIRE: When using mineral spirits, use
only conductive metal pails placed on a grounded
(concrete) surface. DO NOT use plastic containers.
3. Designate 1 gallon container for waste.
4. Remove Paint Cup, wipe excess
paint from Paint Cup cover.
5. Pour excess paint back into paint container.
6. Remove used Cup Liner and insert clean Cup Liner.
Note: Cup Liner may be cleaned and reused.
7. Fill Cup Liner half-full with appropriate solvent.
8. Replace Paint Cup.
9. Open Air Bleed Valve, squeeze Liner until
reservoir inside Air Hole is filled with solvent.
10. Close Air Bleed Valve.
11. Shake Sprayer for 10 seconds.
12. Attach battery and unlock Trigger.
13. Prime:
a. Open Prime/Spray Valve.
b. Turn Sprayer upside-down, press
Trigger for 2 seconds.
c. Close Prime/Spray Valve.

Page 15For technical questions, please call 1-888-866-5797.Item 58520
RETURNS NOT ACCEPTED & WARRANTY VOID
if Sprayer is not properly cleaned and lubricated immediately after every use.
Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETYOPERATIONMAINTENANCE SETUP
14. Clean Spray Tip:
a. Turn Sprayer upside-down, pointing
at interior side of waste container,
press Trigger for 5 seconds.
b. Reverse Spray Tip to CLEAN position.
c. Turn Sprayer upside-down, pointing at
interior side of waste container, press
Trigger for 5 seconds. Hold Spray Valve
against edge of grounded metal waste
container to ground Spray Gun.
Waste
15. Lock Trigger and remove battery.
16. Remove Nozzle Guard, Spray Tip and
Seal according to Spray Tip and Nozzle
Guard on page 17 and place in
container of appropriate solvent.
17. Clean Sprayer:
a. Attach battery and unlock Trigger.
b. Turn Sprayer upside-down, pointing into waste
container, press Trigger until solvent is gone.
Hold Spray Valve against edge of grounded
metal waste container to ground Spray Gun.
Waste
c. Refill Cup Liner with solvent and repeat cleaning
process as necessary until solvent is clear.
d. Lock Trigger and remove battery.
e. Remove Paint Cup, then remove
Filter from Paint Cup cover. Place
Filter in container of solvent.
f. Remove Prime/Spray and Air Bleed Valves.
Place valves in container of solvent.
g. Let Sprayer parts dry completely.
18. Clean Accessories:
a. Using included brush and cleaning
tool, scrub accessories until clean.
b. Let accessories dry completely.
c. Reassemble Sprayer.
19. Insert clean Cup Liner.
a. Lubricate:
b. Pour 1 oz. of Storage Fluid into Cup Liner.
c. Replace Paint Cup.
d. Attach battery and unlock Trigger.
e. Open Prime/Spray Valve.
f. Turn Sprayer upside-down, press
Trigger for 2 seconds.
g. Close Prime/Spray Valve.
20. Lock Trigger and remove battery.
21. Store Sprayer indoors out of reach of
children. Store battery and charger
according to battery’s instruction manual.
NOTE: After storage, dispose of Storage Fluid
according to local hazardous waste standards.

Page 16 For technical questions, please call 1-888-866-5797. Item 58520
RETURNS NOT ACCEPTED & WARRANTY VOID
if Sprayer is not properly cleaned and lubricated immediately after every use.
Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETY OPERATION MAINTENANCESETUP
Maintenance and Lubrication
Procedures not specifically explained in this manual
must be performed only by a qualified technician.
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Disconnect battery before performing any inspection or maintenance procedures.
TO PREVENT SERIOUS INJURY FROM TOOL FAILURE: Do not use damaged equipment.
If abnormal noise, vibration, or leaking air occurs, have the problem corrected before further use.
1. BEFORE EACH USE, inspect the general
condition of the tool. Check for:
• leaking, swollen, or cracked battery pack,
• loose hardware,
• misalignment or binding of moving parts,
• cracked or broken parts, and
• any other condition that may
affect its safe operation.
2. Li-Ion BATTERY MUST BE RECYCLED OR
DISPOSED OF PROPERLY.
Do not short, incinerate or open battery.
3. AFTER EVERY USE, clean and lubricate, then
wipe external surfaces of the tool with clean cloth.
4. Store in clean dry location out of reach of children.

Page 17For technical questions, please call 1-888-866-5797.Item 58520
RETURNS NOT ACCEPTED & WARRANTY VOID
if Sprayer is not properly cleaned and lubricated immediately after every use.
Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETYOPERATIONMAINTENANCE SETUP
Spray Tip and Nozzle Guard
Attach
1. Seat Seal on end of Spray Tip, then insert
Seal into back of Nozzle Guard.
SPRAY
Seal
Nozzle
Guard
Spray
Tip
2. Insert Spray Tip, then rotate a full turn to align Seal.
SPRAY
3. Remove Tip, then thread Nozzle Guard onto
Spray Gun. Turn nut by hand until almost tight,
then holding nut and Nozzle Guard together,
tighten completely. Do not overtighten.
• Attach horizontally for horizontal spray pattern.
• Attach vertically for vertical spray pattern.
4. Install Tip into Nozzle Guard, then rotate
until SPRAY end is facing forward.
SPRAY
Remove
1. During operation: Remove Spray Tip from Nozzle
Guard, then remove Nozzle Guard from Spray Gun.
2. During cleaning or changing tip size: Remove
Spray Tip from Nozzle Guard, then remove
Nozzle Guard from Spray Gun. Insert Spray
Tip into front of Nozzle Guard to remove Seal.
SPRAY

Page 18 For technical questions, please call 1-888-866-5797. Item 58520
RETURNS NOT ACCEPTED & WARRANTY VOID
if Sprayer is not properly cleaned and lubricated immediately after every use.
Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETY OPERATION MAINTENANCESETUP
Troubleshooting
Problem Possible Causes Likely Solutions
Decreased output. 1. Obstructed Trigger.
2. Obstructed Filter.
1. Clean around Trigger to ensure movement.
2. Clean or replace Filter.
No Output 1. Inlet Valve stuck.
2. Sprayer not primed.
3. Clogged Spray Tip.
4. Multiple Liners in Paint Cup.
5. Paint Cup loose.
6. Prime/Spray Valve open.
7. Spray Tip in Clean position.
8. Not enough paint.
9. Air in Liner.
1. Unplug Sprayer, remove Cup and
Filter. Turn Sprayer upside down and
use Cleaning Tool to loosen Inlet Valve
(Part 30 on Parts List and Diagram).
2. Prime Sprayer.
3. Clean Spray Tip with included cleaning tool.
4. Use only one Liner in Cup Holder.
5. Tighten Paint Cup.
6. Close Prime/Spray Valve.
7. Reverse Spray Tip to Spray position.
8. Add paint.
9. Remove air according to 4 on page 12.
Nothing happens
when Trigger
squeezed
Dead Battery. Recharge or replace Battery.
Inconsistent
paint flow, blobs
and splatters.
1. Clogged or worn Spray Tip.
2. Incorrect sized Spray Tip.
3. Clogged Filter.
4. Incorrect Speed.
5. Moving Sprayer too fast.
6. Paint too thick.
7. Contaminated paint.
8. Air in Liner.
1. Clean or replace Spray Tip.
2. Use different sized Spray Tip.
3. Clean or replace Filter.
4. Adjust speed.
5. Move Sprayer slower.
6. Thin paint following manufacturer’s directions.
7. Clean Sprayer and replace paint.
8. Remove air according to 4 on page 12.
Paint surface is
bumpy or has orange
peel texture.
1. Incorrect paint volume.
2. Sprayer too far from workpiece.
1. Adjust Speed.
2. Hold Sprayer closer to workpiece.

Page 19For technical questions, please call 1-888-866-5797.Item 58520
RETURNS NOT ACCEPTED & WARRANTY VOID
if Sprayer is not properly cleaned and lubricated immediately after every use.
Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETYOPERATIONMAINTENANCE SETUP
Problem Possible Causes Likely Solutions
Paint sags or runs. 1. Paint applied too thick.
2. Sprayer too close to workpiece.
3. Uneven or hesitant
motion of spray gun.
4. Excess overlapping of
each spray stroke.
1. Apply thinner coats, allowing
paint to dry between coats.
2. Hold Sprayer further away from workpiece.
3. Keep spray gun moving.
4. Apply two thin coats rather than one thick
coat. Overlap 1/3 to 1/2 on second coat.
Blotchy surface
(blushing) or
uneven color.
1. Uneven paint application.
2. Work material absorbs
paint unevenly.
1. Start each stroke off the work material
and overlap each stroke consistently.
2. Use a conditioner or sealer coat
before applying the finish coat.
Spots on surface
with light center
(fish eyes).
1. Improper primer or
incompatible surface.
2. Surface contamination.
1. Check manufacturer’s recommendations
for primer or compatible surfaces.
2. Clean workpiece thoroughly.
Spots on surface
with dark center
(contamination).
1. Surface contamination.
2. Insufficiently sanded
workpiece.
3. Raised grain.
1. Clean workpiece thoroughly.
2. Sand workpiece to a sufficiently
fine grit before painting.
3. Wipe workpiece with thinner to raise grain,
then sand with fine grit to knock off “hairs”.

Page 20 For technical questions, please call 1-888-866-5797. Item 58520
RETURNS NOT ACCEPTED & WARRANTY VOID
if Sprayer is not properly cleaned and lubricated immediately after every use.
Clean and lubricate Sprayer immediately to prevent permanent damage.
SAFETY OPERATION MAINTENANCESETUP
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 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 PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER 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 REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS
THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO