McGRAW 57572 3 Gallon Oil Free Portable Air Compressor Owner’s Manual

3 Gallon Oil Free Portable Air Compressor

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 the product has no number). Keep this manual and the receipt in a safe and dry place for future reference.

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Email our technical support at: productsupport@harborfreight.com

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 improvements, the actual product may differ slightly from the product described herein. Tools required for assembly and service may not be included.

WARNING
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.

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.
DANGER| Indicates a hazardous situation that, if not avoided, will result in death or serious injury.
WARNING| Indicates a hazardous situation that, if not avoided, could result in death or serious injury.
CAUTION| Indicates a hazardous situation that, if not avoided, could result in minor or moderate injury.
NOTICE
CAUTION**| 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 that cannot be built into this product but must be supplied by the operator.

• Work area safety
  a. Keep work area clean and well-lit.
  Cluttered or dark areas invite accidents.
  b. Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. Power tools create sparks that may ignite dust or fumes.
  c. Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

• Electrical safety
  a. Power tool plugs must match the outlet.
  Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock.
  b. Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges, and refrigerators.
  There is an increased risk of electric shock if your body is earthed or grounded.
  c. Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.

• 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 a power source or moving the compressor.

• 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. Disconnect the plug from the power source 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.

• 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 the marked maximum pressure of attachment.

3. Risk of injury – do not direct airstream at people or animals.

4. Do not use to supply breathing air.

5. Do not leave the compressor unattended for an extended period while plugged in. Unplug the compressor after working.

6. Keep compressor well-ventilated. Do not cover the compressor during use.

7. Drain Tank daily and after use. Internal rust causes tank failure and explosion.

8. Do not remove the valve cover or adjust internal components.

9. The compressor head gets hot during operation. Do not touch it or allow children nearby during or immediately following the operation.

10. Do not use the air hose to move the compressor.

11. Release the pressure in the storage tank before moving.

12. The use of accessories or attachments not recommended by the manufacturer may result in a risk of injury to persons.

13. All airline 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.

14. USE OF AN EXTENSION CORD IS NOT RECOMMENDED. If you choose to use an extension cord, use the following guidelines:
    a. Make sure your extension cord is in good condition.
    b. Be sure to use an extension cord that is heavy enough to carry the current your product will draw. An undersized cord will cause a drop in line voltage resulting in loss of power and overheating. Table A shows the correct size to use depending on cord length and nameplate ampere rating. If in doubt, use the next heavier gauge. The smaller the gauge number, the heavier the cord.

15. Industrial applications must follow OSHA guidelines.

16. Maintain labels and nameplates on the compressor. These carry important safety information. If unreadable or missing, contact Harbor Freight Tools for a replacement.

17. This product is not a toy.
    Keep it out of reach of children.

18. People with pacemakers should consult their physician(s) before use. Electromagnetic fields in close proximity to heart pacemakers could cause pacemaker interference or pacemaker failure.

TABLE A: RECOMMENDED MINIMUM WIRE GAUGE FOR EXTENSION CORDS (120 VOLT)

NAMEPLATE AMPERES (at full load)| EXTENSION CORD LENGTH
25′| 50′| 100′| 150′
0 — 6| 18| 16| 16| 14
6.1 — 10| 18| 16| Do not use.
10.1 — 12| 16| 16| Do not use.
12.1 — 16| 14| 12| Do not use.

**SAVE THESE INSTRUCTIONS.**

Grounding

WARNING
****TO PREVENT ELECTRIC SHOCK AND DEATH FROM INCORRECT GROUNDING WIRE CONNECTION:
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 compressor.
Never remove the grounding prong from the plug. Do not use the compressor 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.

110-120 VAC Grounded Compressors: Compressors with Three Prong Plugs

1. In the event of a malfunction or breakdown, grounding provides a path of least resistance for electric current to reduce the risk of electric shock. This compressor is equipped with an electric cord having an equipment-grounding conductor and a grounding plug. The plug must be plugged into a matching outlet that is properly installed and grounded in accordance with all local codes and ordinances.

2. Do not modify the plug provided – if it will not fit the outlet, have the proper outlet installed by a qualified electrician.

3. Improper connection of the equipment-grounding conductor can result in a risk of electric shock.
   The conductor with insulation having an outer surface that is green with or without yellow stripes is the equipment-grounding conductor. If repair or replacement of the electric cord or plug is necessary, do not connect the equipment grounding conductor to a live terminal.

4. Check with a qualified electrician or service personnel if the grounding instructions are not completely understood, or if in doubt as to whether the compressor is properly grounded.

5. Use only 3-wire extension cords that have 3-prong grounding plugs and 3-pole receptacles that accept the compressor’s plug.

6. Repair or replace damaged or worn cord immediately.

7. This compressor is intended for use on a circuit that has an outlet that looks like the one illustrated above in 125 VAC 3-Prong Plug and Outlet. The compressor has a grounding plug that looks like the plug illustrated above in 125 VAC 3-Prong Plug and Outlet.

8. The outlet must be properly installed and grounded in accordance with all codes and ordinances.

9. Do not use an adapter to connect this compressor to a different outlet.

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
| Double Insulated

V

| Volts

~

| Alternating Current

A

| Amperes

Specifications

0.9 SCFM @ 40 PSI
Sound Level| 84 dBA @ 3′

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.
WARNING
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch “OFF” and unplug the Air Compressor from its electrical outlet before assembling or making any adjustments to the 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

Breaking in the Compressor

1. Turn Power Switch OFF and unplug Power Cord.
2. Fully open Regulator.
3. Fully open Drain Valve.
4. Plug-in Power Cord.
5. Turn Power Switch ON.
6. Let the unit run for 15 minutes. Air will expel freely through the Drain Valve.
7. Turn Power Switch OFF.
8. Unplug Power Cord and close the Drain Valve.

Air Connection Setup

1. Connect 1/4″ air hose with Industrial (M-style) plug (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.
2. Consult air tool’s manual for needed accessories.

Operating Instructions

1. **** 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.

Compressor 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 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.
3. Route the power cord from the compressor to the grounded wall outlet, along a safe path without creating a tripping hazard or exposing the power cord to possible damage.

General Operation

1. Close the Drain Valve.

2. Plug the Power Cord into a grounded 120 VAC electrical outlet.

3. Turn the Power Switch ON.

4. Allow the Air Compressor to build up pressure until it cycles off.
   Note: At the beginning of the day’s first use of the Air Compressor, check for air leaks by applying soapy water to connections while the Air Compressor is pumping and after pressure cutout.
   Look for air bubbles. If air bubbles are present at connections, tighten connections. Do not use the Air Compressor unless all connections are airtight, the extra air leaking out will cause the compressor to operate too often, increasing wear on the compressor.
   Note: As long as the Power Switch is ON, the operation of the Air Compressor is automatic, controlled by an internal pressure switch. The Compressor will turn on automatically when the air pressure drops to 85 PSI and will turn off automatically when the air pressure reaches 110 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.

5. Adjust the Regulator Knob so that the air output is enough to properly power the tool, but the output will not exceed the tool’s maximum air pressure at any time. Turn the knob clockwise to increase the pressure and counter-clockwise to decrease pressure. Adjust the pressure gradually, while checking the air output gauge to set the pressure.

6. Make sure the air tool’s throttle or switch is in the off position. Connect the air tool to the air hose.

7. Use the air tool as needed.

8. After the job is complete, turn the Power Switch OFF.

9. Unplug the Air Compressor.

10. Bleed air from the tool then disconnects the tool.

11. Drain Tank according to Draining Moisture from the Tank on page 10.

12. Clean, then store the Air Compressor indoors.

Emergency Depressurization
If it is necessary to quickly depressurize the 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

This unit is equipped with Thermal Overload Protection.

1. If the Compressor automatically shuts off before reaching its normal cutoff pressure:
   a. Turn it off and unplug it for 15 minutes.
   b. Plug it back in.
   c. Turn unit on and resume operation.

2. Possible causes of repeated automatic shut off of the compressor are:
   a. Using an extension cord that
   is too long or narrow;
   b. An air leak or open hose causes the compressor to cycle too often and build up heat.
   c. Turning Air Compressor off and on again too quickly.

3. Correct any issues before further use to avoid damage to the compressor.

Maintenance and Servicing

** Procedures are not specifically explained in this manual must be performed only by a qualified technician.
WARNING**

TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch “OFF” and unplug the Compressor from its electrical outlet before performing any inspection, maintenance, or cleaning procedures.
TO PREVENT SERIOUS INJURY FROM 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 the 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 the external surfaces of the compressor with a clean cloth.

3. WARNING! TO PREVENT SERIOUS INJURY: If the supply cord of this 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 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 compressor.
  Monthly:**
  Inspect Safety Valve.
• To check for air leaks, apply soapy water to joints while the Air Compressor is pressurized. Look for air bubbles.
  ** To clean the compressor surface, wipe with a damp cloth, using a mild detergent or mild solvent.

Draining Moisture from the 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 the Power Switch off.
2. Place a collection pan under the Moisture Drain.
3. Turn the Drain Valve to open it.
4. When all the pressure and moisture is released, close the Drain Valve.

Record Product’s Serial Number Here:
Note: If the product has no serial number, record the 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 number when ordering:
57572: UPC 193175417527
57567: UPC 193175417473

Troubleshooting

Compressor does
not start or restart| 1. Tank(s) already pressurized.
2. Power cord not plugged in properly3. Incorrect power supply.
4. No power at outlet.
5. Thermal overload switch tripped.
6. Building power supply circuit tripped
or blown fuse.
7. Cord wire size is too small or
cord is too long to properly
power compressor.
8. Compressor needs service.| Building power supply circuit tripped
1. No problem. The compressor will start when needed.
2. Check that cord is plugged in securely.
3. Check that circuit matches compressor requirements.
4. Reset circuit breaker, or have outlet serviced by a qualified technician.
5. Turn off Compressor and wait for it to cool down.
Press the reset button. Resume operation.
6. Reset circuit or replace fuse. Check for low voltage conditions. It may be necessary to disconnect other electrical appliances from the circuit or move the compressor to its own circuit.
7. Use a larger diameter or shorter extension cord or
eliminate the extension cord. See Recommended Wire
Gauge for Extension Cords in Safety section.
8. Have unit inspected by a qualified technician.
Compressor builds
pressure too slowly| 1. Incorrect power supply.
2. Working environment too cold.
3. Safety valve leaking.
4. Loose fittings.| 1. Check that the circuit matches compressor requirements.
2. Move the compressor to a warmer location.
3. Listen for air leaking from valve.
If leaking, replace it with an identical valve with the same rating.
DO NOT SEAL OR TAMPER WITH THE 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 filters need 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 inlet and outlet filters.
Clean and/or replace as needed.
2. Have technician clean or replace, as needed.
3. Check if accessory CFM is met by Compressor.
If Compressor cannot supply enough
airflow (CFM), 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 filters need cleaning/replacing.
2. Unusually dusty environment.
3. Extension cord used.| 1. Check inlet and outlet filters.
Clean and/or replace as needed.
2. Clean and/or replace filters more often or move unit to cleaner environment.
3. Eliminate extension cord.
The 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 CFM is met by Compressor.
If the Compressor cannot supply enough
air flow (CFM), 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
the 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 test ring of 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.

Parts List and Diagram

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.

57572 Parts List

57572 Assembly Diagram

57567 Parts List

57567 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.

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