Bauer 20191C-B User manual

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Email our technical support at: [email protected]
20191C-B
1.6 GALLON BRUSHLESS
AIR COMPRESSOR
57394
For Best Results, Use 2
5.0 Amp Hour Batteries
(Sold Separately)
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. 20j
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©2020 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.

Page 2 For technical questions, please call 1-888-866-5797. Item 57394
SAFETY OPERATION MAINTENANCEINSTALLATION
Table of Contents
Safety ......................................................... 2
Installation .................................................. 6
Specifications ............................................. 6
Operation.................................................... 7
Maintenance.............................................. 10
Parts List and Diagram.............................. 14
Warranty .................................................... 16
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 INFORMATION
General Safety Warnings
WARNING Read all safety warnings and instructions.
Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.
Save all warnings and instructions for future reference.
The warnings, precautions, 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.
1. Work area safety
a. Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
b. Do not operate the Compressor in explosive
atmospheres, such as in the presence
of flammable liquids, gases or dust.
Compressor motors produce sparks
which may ignite the dust or fumes.
c. Keep children and bystanders away
from an operating compressor.
2. Electrical safety
Do not expose compressor to rain or wet
conditions. Water entering a compressor
will increase the risk of electric shock.

Page 3For technical questions, please call 1-888-866-5797.Item 57394
SAFETYOPERATIONMAINTENANCE INSTALLATION
3. Personal safety
a. Stay alert, watch what you are doing and
use common sense when operating this
compressor. Do not use this compressor
while you are tired or under the influence
of drugs, alcohol or medication. A moment
of inattention while operating a compressor
may result in serious personal injury.
b. Use personal protective equipment.
Always wear ANSI-approved eye
protection during setup and use.
c. Prevent unintentional starting. Ensure the
switch is in the off-position before connecting
to power source or moving the compressor.
4. Compressor use and care
a. Do not use the compressor if the switch
does not turn it on and off. Any compressor
that cannot be controlled with the switch
is dangerous and must be repaired.
b. Remove the battery pack before making
any adjustments, changing accessories,
or storing the compressor. Such
preventive safety measures reduce the risk
of starting the compressor accidentally.
c. Store an idle compressor out of the reach
of children and do not allow persons
unfamiliar with the compressor or these
instructions to operate it. A compressor is
dangerous in the hands of untrained users.
d. Maintain the compressor. Keep the
compressor clean for better and safer
performance. Follow instructions for
lubricating and changing accessories.
Keep dry, clean and free from oil and grease.
Check for misalignment or binding of moving
parts, breakage of parts and any other
condition that may affect the compressor’s
operation. If damaged, have the compressor
repaired before use. Many accidents are
caused by a poorly maintained compressor.
e. Use the compressor in accordance with
these instructions, taking into account
the working conditions and the work to
be performed. Use of the compressor for
operations different from those intended
could result in a hazardous situation.
5. Service
a. Have your compressor serviced by a
qualified repair person using only identical
replacement parts. This will ensure that the
safety of the compressor is maintained.
Air Compressor Safety Warnings
1. Risk of fire or explosion - do not spray
flammable liquid in a confined area or towards a
hot surface. Spray area must be well-ventilated.
Do not smoke while spraying or spray where
spark or flame is present. Arcing parts - keep
compressor at least 20 feet away from explosive
vapors, such as when spraying with a spray gun.
2. Risk of bursting - do not adjust regulator higher
than marked maximum pressure of attachment.
3. Risk of injury - do not direct air
stream at people or animals.
4. Do not use to supply breathing air.
5. Keep compressor well-ventilated.
Do not cover compressor during use.
6. Drain Tank daily and after use. Internal rust causes
tank failure and explosion.
7. Do not remove the valve cover or
adjust internal components.
8. Compressor head gets hot during operation.
Do not touch it or allow children nearby
during or immediately following operation.
9. Do not use the air hose to move the compressor.
10. Release the pressure in the
storage tank before moving.
11. The use of accessories or attachments not
recommended by the manufacturer may
result in a risk of injury to persons.
12. All air line components, including hoses, pipe,
connectors, filters, etc., must be rated for a minimum
working pressure of 150 PSI, or 150% of the
maximum system pressure, whichever is greater.
Industrial applications must follow OSHA guidelines.
13. Maintain labels and nameplates on the
compressor. These carry important safety
information. If unreadable or missing, contact
Harbor Freight Tools for a replacement.
14. This product is not a toy.
Keep it out of reach of children.
15. Wear ANSI-approved safety goggles and
heavy-duty work gloves during use.
16. Do not expose to rain or wet conditions.
17. 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.

Page 4 For technical questions, please call 1-888-866-5797. Item 57394
SAFETY OPERATION MAINTENANCEINSTALLATION
18. Do not leave the tool unattended when the
Battery Pack is connected. Turn off the tool,
and remove the Battery Pack before leaving.
19. 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.
20. The warnings, precautions, 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.
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.

Page 5For technical questions, please call 1-888-866-5797.Item 57394
SAFETYOPERATIONMAINTENANCE INSTALLATION
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:
a. Open,
b. Drop,
c. Short-circuit,
d. Puncture,
e. Incinerate, or
f. 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.
5. Li-Ion BATTERY MUST BE RECYCLED
OR DISPOSED OF PROPERLY.
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.
Symbology
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
VVolts
~Alternating Current
AAmperes
WARNING marking concerning
Risk of Explosion.
Do not puncture, short, or open
battery packs and do not charge
damaged battery packs.
WARNING marking concerning
Risk of Fire. Do not cover
Charger ventilation ducts. Charge
on fireproof surface only.

Page 6 For technical questions, please call 1-888-866-5797. Item 57394
SAFETY OPERATION MAINTENANCEINSTALLATION
Specifications
Battery Type Bauer 20V Li-Ion 57007 (sold separately)
Charger Type Bauer 20V Li-Ion 63529, 63947 (sold separately)
Air Outlet Size 1/4″ - 18 NPT
Air Pressure Shut-off 135 PSI
Restart 105 PSI
Air Tank Capacity 1.6 Gallon
Air Flow Capacity 1.1 SCFM @ 90 PSI
Sound Level 71.5 dBA
Installation
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.
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch “OFF” and remove its Battery Pack(s) before
assembling or making any adjustments to the Air Compressor.
Note: For additional information regarding the parts listed in the following pages,
refer to the Assembly Diagram near the end of this manual.
Functions
Drain
Valve
Power
Switch
Air
Outlet
Tank
Gauge
Safety
Valve
Outlet
Gauge
Regulator

Page 7For technical questions, please call 1-888-866-5797.Item 57394
SAFETYOPERATIONMAINTENANCE INSTALLATION
Breaking in Air Compressor
1. Turn Power Switch OFF
and remove battery pack.
2. Fully open Drain Valve.
3. Insert fully charged Battery Pack(s).
4. Turn Power Switch ON.
5. Let unit run for 30 minutes. Air will expel freely
through the Drain Valve.
6. Turn Power Switch OFF.
7. Remove Battery Pack(s) and close Drain Valve.
Air Connection Setup
1. Connect 1/4″ NPT air hose (sold separately)
to the Air Outlet. The air hose must be long
enough to reach the work area with enough extra
length to allow free movement while working.
• Using PTFE tape, connect 1/4" industrial
fittings (sold separately) to air hose.
To Compressor To Air Tool
Air Plug Coupler
2. Connect 1/4" industrial plug (included) to coupler.
To Air ToolTo Coupler
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.
Work Area Set Up
1. Designate a work area that is clean and well-lit.
The work area must not allow access by
children or pets to prevent injury.
2. Locate the Air Compressor on a flat level surface
to ensure proper pump lubrication and to prevent
damage to the unit. Keep at least 12″ of space
around the unit to allow air circulation.
General Operation
1. Close Drain Valve.
2. Close Regulator.
3. Turn Power Switch OFF.
4. Insert fully charged Battery Pack(s).
5. Turn Power Switch ON.
6. Allow Air Compressor to build up
pressure until it cycles off.
Note: At beginning of the day’s first use, check for
air leaks by applying soapy water to connections
while Air Compressor is pumping and after pressure
cut-out. Look for air bubbles. If air bubbles are
present at connections, tighten connections. Do not
use Air Compressor unless all connections are air
tight, extra air leaking out will cause Air Compressor to
operate too often, increasing wear on Air Compressor.
Note: As long as Power Switch is ON, operation of
Air Compressor is automatic, controlled by an internal
pressure switch. Air Compressor will turn on
automatically when air pressure drops to 105 PSI,
and will turn off automatically when air pressure reaches
135 PSI.
WARNING! TO PREVENT SERIOUS
INJURY AND DEATH FROM
EXPLOSION:
Do not adjust the internal
pressure switch. Any change to the
automatic pressure levels may cause excess pressure to
accumulate, causing a hazardous situation.

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SAFETY OPERATION MAINTENANCEINSTALLATION
Air Tools
Note: Consult air tool’s manual for needed accessories.
1. Make sure air tool’s throttle or switch is in OFF
position. Thread air tool onto 1/4″ Plug.
2. Adjust Regulator so that air output is enough
to properly power tool, but output will not
exceed tool’s maximum air pressure at any
time. Turn Regulator clockwise to increase
pressure and counter-clockwise to decrease
pressure. Adjust pressure gradually, while
checking Air Outlet Gauge to set pressure.
3. Use air tool as needed.
4. When finished, turn Power Switch OFF.
5. Remove Battery Pack(s).
6. Bleed air from tool then disconnect tool.
7. Drain Tank according to Draining Moisture
from Air Tank on page 11.
8. Clean, then store Air Compressor indoors
out of children’s reach.
Inflator
TO PREVENT SERIOUS INJURY OR DEATH: Do not operate
Inflator/Deflator while car engine is running in an enclosed area.
WARNING! TO PREVENT SERIOUS INJURY AND DEATH FROM EXPLOSION:
Before Inflating, check item manufacturer’s recommended air pressure.
Do not exceed that pressure. Over inflation may result in an explosion.
High Pressure - Tires and Small Inflatables
WARNING! Wear ANSI-approved
eye protection during use.
WARNING! TO PREVENT SERIOUS INJURY AND
DEATH FROM EXPLOSION: Do not overinflate.
Do not leave unit unattended while inflating.
1. Car and bicycle Tires:
a. Close Regulator.
b. Thread Tire Inflator onto 1/4" Plug.
c. Remove tire’s valve cap.
d. Push Inflator firmly over tire’s valve stem.
e. Set Regulator to tire’s rated pressure.
f. Close Regulator immediately after
rated pressure is achieved.
g. Remove Inflator.
h. When finished, turn off Compressor.
2. Sports Balls:
a. Close Regulator.
b. Thread 1/8″ Adaptor onto 1/4″ Plug.
c. Thread Ball Needle into 1/8" Adaptor.
d. Insert Ball Needle into ball.
e. Set Regulator to ball’s rated pressure.
f. Close Regulator immediately after
rated pressure is achieved.
g. Remove Ball Needle.
h. When finished, turn off Compressor.
3. Small Inflatables:
a. Close Regulator.
b. Thread 1/8″ Adaptor onto 1/4″ Plug.
c. Thread Tapered Inflator into 1/8″ Adaptor.
d. Insert Tapered Inflator into inflatable.
e. Set Regulator to 10 PSI.
f. Close Regulator when item is properly inflated.
g. Remove Tapered Inflator.
h. When finished, turn Power Switch OFF.
4. Drain Tank according to Draining Moisture
from Air Tank on page 11.
5. Remove Battery Pack(s).
6. Clean, then store Air Compressor indoors
out of children’s reach.

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SAFETYOPERATIONMAINTENANCE INSTALLATION
Low Pressure - Large Inflatables
WARNING! TO PREVENT SERIOUS INJURY: Wear
ANSI-approved eye protection during use.
WARNING! TO PREVENT SERIOUS INJURY AND
DEATH FROM EXPLOSION: Do not overinflate.
Do not leave unit unattended while inflating.
1. Close Regulator.
2. Thread 1/8" Adaptor onto 1/4" Plug.
3. Thread 1/8" Low Pressure Adaptor into 1/8″ Adaptor.
4. Attach appropriate sized Inflator.
Small
Medium
Large
5. Insert Inflator into inflatable.
6. Set Regulator to 10 PSI.
7. Close Regulator when item is properly inflated.
8. Remove Inflator.
9. When finished, turn Power Switch OFF.
10. Drain Tank according to Draining Moisture
from Air Tank on page 11.
11. Remove Battery Pack(s).
12. Clean, then store Air Compressor indoors
out of children’s reach.
Emergency Depressurization
If it is necessary to quickly depressurize the Air Compressor, turn the Power Switch OFF.
Then, pull on the ring on the Safety Valve to quickly release stored air pressure.
Automatic Shut off System
1. If Air Compressor automatically shuts off
before reaching its normal cutoff pressure:
a. Shut off all tools.
b. Turn Power Switch to OFF position.
c. Wait until Air Compressor cools down
(about 10 minutes).
d. Turn Power Switch ON.
e. Resume operation.
2. Possible causes of repeated automatic
shut off of the Air Compressor are:
a. An air leak or open hose causing
the Air Compressor to cycle too
often and build up heat;
b. Turning Air Compressor off and
on again too quickly.
3. Correct any issues before further use to
avoid damage to Air Compressor.

Page 10 For technical questions, please call 1-888-866-5797. Item 57394
SAFETY OPERATION MAINTENANCEINSTALLATION
Maintenance and Servicing
Procedures not specifically explained in this manual must
be performed only by a qualified technician.
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch “OFF” and remove Battery Pack(s) before performing
any inspection, maintenance, or cleaning procedures.
TO PREVENT SERIOUS INJURY FROM AIR COMPRESSOR FAILURE:
Do not use damaged equipment. If abnormal noise or vibration occurs,
have the problem corrected before further use.
Cleaning, Maintenance, and Lubrication
1. BEFORE EACH USE, inspect the general
condition of air Air Compressor. Check for:
• loose hardware,
• misalignment or binding of moving parts,
• cracked or broken parts,
• damaged electrical wiring, and
• any other condition that may
affect its safe operation.
2. AFTER USE, wipe external surfaces of
Air Compressor with a clean cloth.
3. WARNING! TO PREVENT SERIOUS
INJURY: If the supply cord of this Air
Compressor is damaged, it must be replaced
only by a qualified service technician.
Maintenance Schedule
Following are general guidelines for maintenance checks of the Air Compressor.
Note: The environment in which the Air Compressor is used, and the frequency of use will affect how
often you will need to check the Air Compressor components and perform maintenance procedures.
Daily:
a. Make sure all nuts and bolts are tight.
b. Drain moisture from air tank.
c. Check for abnormal noise or vibration.
d. Check for air leaks.*
e. Wipe off any oil or dirt from the Air Compressor.
Weekly:
a. Inspect Air Filter.
Monthly:
a. Inspect Safety Valve.
* To check for air leaks, apply soapy water to joints while
the Air Compressor is pressurized. Look for air bubbles.

Page 11For technical questions, please call 1-888-866-5797.Item 57394
SAFETYOPERATIONMAINTENANCE INSTALLATION
Draining Moisture from Air Tank
The Moisture Drain is located under the Tank. It must be used daily to release all trapped air and
moisture from the Tank. Doing this will eliminate condensation and prevent tank corrosion.
1. Turn Power Switch OFF.
2. Place a collection pan under Drain Valve.
3. Turn Drain Valve to open it. Tilt
Compressor forward to drain.
4. When all pressure and moisture are released,
close Drain Valve.
Air Filter Maintenance
1. Remove Cover and Filter. Check
Filter for accumulated dirt.
2. Cleaning:
a. To prevent injury from dust and debris,
wear ANSI-approved safety goggles,
NIOSH-approved dust mask/respirator, and
heavy-duty work gloves. In a well-ventilated
area away from bystanders, use pressurized air
(no more than 15 PSI) to blow dust out of filter.
b. Replace clean filter.
c. Replace Cover.

Page 12 For technical questions, please call 1-888-866-5797. Item 57394
SAFETY OPERATION MAINTENANCEINSTALLATION
Troubleshooting
Problem Possible Causes Likely Solutions
Compressor does
not start or restart
1. Tank(s) already pressurized.
2. Battery Pack not properly
connected.
3. Battery Pack not properly charged.
4. Battery Pack burnt-out.
5. Compressor needs service.
1. No problem. Compressor will start when needed.
2. Remove Battery Pack, make sure there are no
obstructions, reinsert the Battery Pack according
to its shape (it should only fit one way), and press
firmly until the Battery Pack locks in place.
3. Make sure Charger is connected and operating properly.
Give enough time for Battery Pack to recharge properly.
4. Dispose of old Battery Pack properly or recycle.
Replace Battery Pack.
5. Have unit inspected by a qualified technician.
Compressor builds
pressure too slowly
1. Battery Pack wearing out.
2. Working environment too cold.
3. Safety valve leaking.
4. Loose fittings.
1. Dispose of old Battery Pack properly or recycle.
Replace Battery Pack.
2. Move compressor to a warmer location.
3. Listen for air leaking from valve.
If leaking, replace with identical valve with same rating.
DO NOT SEAL OR TAMPER WITH SAFETY VALVE.
4. Reduce air pressure, then check all fittings
with a soap solution for air leaks and tighten
as needed. Do not overtighten.
Compressor not
building enough
air pressure
1. Air filter needs cleaning/replacing.
2. Check Valve needs service.
3. Compressor not large enough for
job.
4. Loose fittings.
5. Hose or hose connections
too narrow.
6. High altitude reducing air output.
1. Check air filter.
Clean and/or replace as needed.
2. Have technician clean or replace, as needed.
3. Check if accessory SCFM is met by Compressor.
If Compressor cannot supply enough
air flow (SCFM), use a larger Compressor.
4. Reduce air pressure, then check all fittings
with a soap solution for air leaks and tighten
as needed. Do not overtighten.
5. Replace with wider hose and/or hose connections.
6. Higher altitudes require compressors with greater output.
Overheating 1. Air filter needs cleaning/replacing.
2. Unusually dusty environment.
1. Check air filter.
Clean and/or replace as needed.
2. Clean and/or replace air filter more often or
move unit to cleaner environment.
Compressor
starts and stops
excessively
1. Loose fittings.
2. Compressor not large
enough for job.
1. Reduce air pressure, then check all fittings
with a soap solution for air leaks and tighten
as needed. Do not overtighten.
2. Check if accessory SCFM is met by Compressor.
If Compressor cannot supply enough
air flow (SCFM), use a larger Compressor.
Excessive noise Loose fittings. Reduce air pressure, then check all fittings with a soap solution
for air leaks and tighten as needed. Do not overtighten.
Moisture in
discharge air
Too much moisture in air. Install inline air filter/dryer, and/or relocate
to less humid environment.
Safety Valve “pops” Safety valve needs service. Pull on the ring on the Safety Valve. If it still pops, replace.
Air leaks from
pump or fittings
Loose fittings. Reduce air pressure, then check all fittings with a soap solution
for air leaks and tighten as needed. Do not overtighten.
Air leaks from tank Defective or rusted tank. Have tank replaced by a qualified technician.
Drain moisture from tank daily to prevent future corrosion.
Follow all safety precautions whenever diagnosing or servicing the compressor.
Disconnect power supply before service.

Page 13For technical questions, please call 1-888-866-5797.Item 57394
SAFETYOPERATIONMAINTENANCE INSTALLATION
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.
Record Product’s Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement
parts. Parts may not be interchangeable. Specify UPC 792363573948 when ordering parts.

Page 14 For technical questions, please call 1-888-866-5797. Item 57394
SAFETY OPERATION MAINTENANCEINSTALLATION
Parts List and Diagram
Parts List
Part Description Qty
1 Ball Needle 1
1-1 Tapered Adaptor
2 1/4" Plug 1
3 Tire Inflator 1
4 1/4" to 1/8" Adaptor 1
5 Tire Inflator 1
6 Low Pressure Inflator 3
6-1 1/8" Low Pressure Adapter 1
7 Storage Compartment Bracket 1
8 Storage Compartment Cover 1
9 Air Filter 1
10 Screw ST4x30 4
11 Back Shroud 1
12 Dust Guard 1
13 Connector 1
14 Pump Assembly 1
15 Elbow Joint 1
16 Nut M3 3
17 Handle Grip 1
18 Self-Tapping Screw ST4x18 2
19 Screw ST3x8 4
20 Battery Guide Rail 2
21 Battery Guide Rail Cover 2
22 PCBA 2
23 Plug 2
24 Battery Guide Rail Rod 1
25 Left Plug 1
Part Description Qty
26 Right Plug 1
27 Power Switch 1
28 Front Shroud 1
29 Screw M4x10 3
30 Pressure Gauge 2
31 Air Outlet 1
32 Pressure Regulator Assembly 1
33 Safety Valve 1
34 High-Pressure Output Tube 1
35 Screw 3
36 Air Tank 1
37 Drain Valve 1
38 Hex Screw 1
39 Right Foot 2
40 Screw 8
41 Left Foot 2
42 Lock Nut 3
43 Pressure Switch 1
44 Screw 4
45 PCB 1 1
46 PCB 2 1
47 Bracket 1
48 One-Way Valve 1
49 High-Pressure Input Tube 1
50 Shock-Absorbing Column 3
51 Screw 5

Page 15For technical questions, please call 1-888-866-5797.Item 57394
SAFETYOPERATIONMAINTENANCE INSTALLATION
Assembly Diagram

Limited 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.
26541 Agoura Road • Calabasas, CA 91302 • 1-888-866-5797