McGRAW 58910 Air Saw Owner’s Manual

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 (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.

Blade sold separately
Visit our website at: http://www.harborfreight.com
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© 2022 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.

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

Instructions pertaining to a risks OF Fired, Electric Shocks, Or injurie to persons
Warning – When using tools, basic precautions should always be followed, including the following:
General
To reduce the risks of electric shock, fire, and injury to persons, read all the instructions before using the tool.

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. Do not operate the tool in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust.
   The tool is able to create sparks resulting in the ignition of the dust or fumes.

3. Keep bystanders, children, and visitors away while operating the tool. Distractions are able to result in the loss of control of the tool.

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 switch is off before connecting to the air supply.
   Do not carry the tool with your finger on the switch or connect the tool to the air supply with the switch on.

4. remove adjusting keys and wrenches before turning the tool on. A wrench or a key that is left attached to a rotating part of the tool increases the risk of personal injury.

5. Do not overreach.
   Keep proper footing and balance at all times. Proper footing and balance enables better control of the tool in unexpected situations.

6. use safety equipment. A dust mask, non-skid safety shoes and a hard hat must be used for the applicable conditions. Wear heavy-duty work gloves during use.

7. always wear eye protection.
   Wear ANSI-approved safety goggles.

8. always wear hearing protection when using the tool.
   Prolonged exposure to high intensity noise is able to cause hearing loss.

9. risk of Electric Shock. this tool is not provided with an insulated gripping surface.
   Contact with a ″live″ wire will also make exposed metal parts of the tool ″live″ and shock the operator.

10. 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.

11. Explore the workpiece to avoid contact with hidden wiring. Thoroughly investigate the workpiece for possible hidden wiring before performing work. Contact with live wiring will shock the operator.

12. Danger! Keep hands and body away from cutting area and blade. Keep your second hand on auxiliary handle or motor housing. Heavy duty work gloves are needed for this tool.
    Contact with the blade will result in a serious injury.

13. Do not reach underneath the work.

Tool use and care

1. Use clamps or another practical way to secure and support the workpiece to a stable platform.
   Holding the work by hand or against the body is unstable and is able to lead to loss of control.

2. Do not exceed the maximum 18 gauge thickness when cutting sheet metal with Saw.

3. 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 the tool is designed.

4. Do not use the tool if the switch does not turn the tool on or off. Any tool that cannot be controlled with the switch is dangerous and must be repaired.

5. Disconnect the tool from the air source before making any adjustments, changing accessories, or storing the tool. Such preventive safety measures reduce the risk of starting the tool unintentionally. Turn off and detach the air supply, safely discharge any residual air pressure, and release the throttle and/or turn the switch to its off position before leaving the work area.

6. 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.

7. Maintain the tool with care. Keep a cutting tool sharp and clean. A properly maintained tool, with sharp cutting edges reduces the risk of binding and is easier to control.

8. 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.

9. 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.

Air Source

1. never connect to an air source that is capable of exceeding 200 psi. Over pressurizing the tool may cause bursting, abnormal operation, breakage of the tool or serious injury to persons. Use only clean, dry, regulated compressed air  at the rated pressure or within the rated pressure range as marked on the tool. Always verify prior to using the tool that the air source has been adjusted to the rated air pressure or within the rated air-pressure range.
2. Never use oxygen, carbon dioxide, combustible gases or any bottled gas as an air source for the tool. Such gases are capable of explosion and serious injury to persons.

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Symbols and Specific Safety instructions

Symbol Definitions

concerning Risk of Eye Injury.
Wear ANSI-approved eye protection.
| WARNING marking concerning Risk of Hearing Loss. Wear hearing protection.
| WARNING marking concerning
Risk of Respiratory Injury. Wear NIOSH-approved dust mask/respirator.
| WARNING marking concerning Risk of Explosion.

Specific Safety instructions

1. The warnings and precautions discussed in this 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.
2. Attach all accessories properly to the tool before connecting the air supply. A loose accessory may detach or break during operation.
3. Obey the manual for the air compressor used to power this tool.
4. Install an in-line shutoff valve to allow immediate control over the air supply in an emergency, even if a hose is ruptured.
5. Use this tool with both hands only. Using tools with only one hand can result in loss of control.
6. Do not lay the tool down until it has come to a complete stop. Moving parts can grab the surface and pull the tool out of your control.

Vibration precautions
This tool vibrates during use. Repeated or long-term exposure to vibration may cause temporary or permanent physical injury, particularly to the hands, arms and shoulders. To reduce the risk of vibration-related injury:

1. Anyone using vibrating tools regularly or for an extended period should first be examined by a doctor and then have regular medical check-ups to ensure medical problems are not being caused or worsened from use. Pregnant women or people who have impaired blood  circulation to the hand, past hand injuries, nervous system disorders, diabetes, or Raynaud’s
   Disease should not use this tool. If you feel any symptoms related to vibration (such as tingling, numbness, and white or blue fingers), seek medical advice as soon as possible.

2. Do not smoke during use. Nicotine reduces the blood supply to the hands and fingers, increasing the risk of vibration-related injury.

3. Wear suitable gloves to reduce the vibration effects on the user.

4. Use tools with the lowest vibration when there is a choice.

5. Include vibration-free periods each day of work.

6. Grip tool as lightly as possible (while still keeping safe control of it). Let the tool do the work.

7. To reduce vibration, maintain tool as explained in this manual.
   If abnormal vibration occurs, stop immediately.

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Functional Description

Specifications

Components and controls

Initial tool Set up/assembly

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.
note: This air tool may be shipped with a protective plug covering the air inlet. Remove this plug before set up.

Air Supply
TO PREVENT SERIOUS INJURY FROM EXPLOSION: Use only clean, dry, regulated, compressed air to power this tool. Do not use oxygen, carbon dioxide, combustible gases, ‘ or any other bottled gas as a power source for this tool.

1. Incorporate a filter, regulator with pressure gauge, oiler, in-line shutoff valve, and quick coupler for best service, as shown on Figure A on page 8 and Figure B on page 9. An in-line shutoff ball valve is an important safety device because it controls the air supply even if the air hose is ruptured. The shutoff valve should be a ball valve because it can be closed quickly.
   Note: If an automatic oiler system is not used, add a few drops of Pneumatic Tool Oil to the airline connection before operation. Add a few more drops after each hour of continual use.

2. Attach an air hose to the compressor’s air outlet. Connect the air hose to the air inlet of the tool. Other components, such as a coupler plug and quick coupler, will make operation more efficient, but are not required.
   WARNING! TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
   Do not install a female quick coupler on the tool. Such a coupler contains an air valve that will allow the air tool to retain pressure and operate accidentally after the air supply is disconnected.
   Note: Air flow, and therefore tool performance, can be hindered by undersized air supply components. The air hose must be long enough to reach the work area with enough extra length to allow free movement while working.

3. Release the Trigger.

4. Close the in-line shutoff valve between the compressor and the tool.

5. Turn on the air compressor according to the manufacturer’s directions and allow it to build up pressure until it cycles off.

6. Adjust the air compressor’s output regulator 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. Adjust the pressure gradually, while checking the air output gauge to set the right pressure range.

7. Inspect the air connections for leaks. Repair any leaks found.

8. If the tool will not be used at this time, turn off and detach the air supply, safely discharge any residual air pressure, and release the Trigger to prevent accidental operation.

Note: Residual air pressure should not be present after the tool is disconnected from the air supply. However, it is a good safety measure to attempt to discharge the tool in a safe fashion after disconnecting to ensure that the tool is disconnected and not powered.

Setup

| Description| Function
---|---|---
A| Air Hose| Connects air to tool
B| Filter| Prevents dirt and condensation from damaging tool or work piece
C| Regulator| Adjusts air pressure to tool
D| Lubricator (optional)| For air tool lubrication
E| Coupler and Plug| Provides quick connection and release
F| Leader Hose (optional)| Increases coupler life
G| Air Cleaner / Dryer (optional)| Prevents water vapor from damaging work piece
H| Air Adjusting Valve (optional)| For fine tuning airflow at tool

| Description ,| Function
---|---|---
A| Vibration Pads| For noise and vibration reduction
B| Anchor Bolts| Secures air compressor in place
C| Ball Valve| Isolates sections of system for maintenance
D| Isolation Hose| For vibration reduction
E| Main Air Line – 3/4″ minimum recommended| Distributes air to branch lines
F| Ball Valve| To drain moisture from system
G| Branch Air Line -1/2″ minimum recommended| Brings air to point of use
H| Air Hose| Connects air to tool
I| Filter| Prevents dirt and condensation from damaging tool or work piece
J| Regulator| Adjusts air pressure to tool
K| Lubricator (optional)| For air tool lubrication
L| Coupler and Plug| Provides quick connection and release
M| Leader Hose (optional)| Increases coupler life
N| Air Cleaner / Dryer (optional)| Prevents water vapor from damaging work piece
O| Air Adjusting Valve (optional)| For fine tuning airflow at tool

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.
inspect tool before use, looking for damaged, loose, and missing parts. if any problems are found, do not use tool until repaired.

tool Set up

TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn off the tool, detach the air supply, safely discharge any residual air pressure in the tool, and release the Trigger and/or turn the switch to its off position before performing any inspection, maintenance, or cleaning procedures.
TO PREVENT SERIOUS INJURY:
Do not adjust or tamper with any control or component in a way not specifically explained within this manual. Improper adjustment can result in tool failure or other serious hazards.
WARNING! The Blade Guard may be removed when replacing Blades but it must always be on during operation. Using the Saw without the Blade Guard can result in serious injury.

1. To remove the Blade Guard, use the Hex Wrench to loosen the two Set Screws on the outside of the tool. When replacing the Blade Guard, place it in the slots and tighten the Set Screws. See Figure C.
   

2. Using the Hex Wrench, loosen the two Set Screws inside, until the Blade can be inserted/ removed. See Figure
   

3. Add a new Blade and tighten the Set Screws.

Note: When Saw is in the upside down position, the Blade teeth will face upward.

Work piece and 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 distraction and injury.

2. Route the air hose along a safe route to reach the work area without creating a tripping hazard or exposing the air hose to possible damage.
   The air hose must be long enough to reach the work area with enough extra length to allow free movement while working.

3. Secure loose workpieces using a vise or clamps (not included) to prevent movement while working.

4. There must not be hazardous objects (such as utility lines or foreign objects) nearby that will present a hazard while working.

General Operating instructions

General Operating instructions

1. When cutting sheet metal, the angled face of the Blade Guard should rest on the plate to minimize its chatter, allowing for smoother cutting action.
   Warning! Do not exceed the maximum 18 gauge thickness when cutting sheet metal with this Saw. Doing so can cause serious injury and damage to the tool.
   Warning! Do not use a dull or cracked Blade. Check that the Blade and Blade Guard are secured tightly before every use.

2. Operate the Saw with two hands. Hold the Housing and Trigger with one hand, keeping your forefinger behind the Safety Lever. Hold the front end of the tool with your other hand.
   Keep all fingers behind the handle recess but do not cover the Chuck vent holes.
   Warning! Failure to use two hands may cause the Saw to vibrate out of your control causing serious injury.

3. Once the Blade (sold separately) is securely installed, push the Safety Lever forward to release the Trigger. Then press down on the Trigger to activate the Saw.

4. Contact the workpiece allowing the Saw to do the cutting for you. Do not exert excessive pressure on the workpiece.
   note: If the tool requires more force to accomplish the task, verify that the tool receives sufficient, unobstructed airflow (CFM) and increase the pressure (PSI) output of the regulator up to the maximum air pressure rating of this  tool. If the tool still does not have sufficient force at maximum pressure and sufficient airflow, then a larger tool may be required.

5. To prevent accidents, turn off the tool, detach the air supply, safely discharge any residual air pressure in the tool, and release the Trigger and/or turn the switch to its off position after use. Clean external surfaces of the tool with a  clean, dry cloth. Then store the tool indoors out of children’s reach.
   Warning! to prevent tool and accessory failure, resulting in serious injury, do not exceed the tool’s maximum air pressure rating.

User-Maintenance instructions

Procedures not specifically explained in this manual must be performed only by a qualified technician.
WARNING
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION: Turn off the tool, detach the air supply, safely discharge any residual air pressure in the tool, and release the Trigger before performing any inspection, maintenance, or cleaning 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.
TO PREVENT SEROUS INJURY FROM EXPLOSION: Lubricate the tool only with specified lubricants. Lubricate the air inlet using only pneumatic tool oil. Lubricate the internal mechanism using only white lithium grease. Other lubricants may damage the mechanism and may be highly flammable, causing an explosion.

Cleaning, Maintenance, and Lubrication
Note: These procedures are in addition to the regular checks and maintenance explained as part of the regular operation of the air-operated tool.

1. Daily – air Supply Maintenance. Every day: a. Maintain the air supply according to the component manufacturers’ instructions.
   b. Maintain the lubricator’s oil level.
   c. Drain the moisture filter regularly.
   d. Performing routine air supply maintenance will allow the tool to operate more safely and will also reduce wear on the tool.

2. Make sure that the Housing that holds the Blade and Air Inlet are free of dirt and debris.

3. periodically: Apply a light machine oil to the pivot point on the Trigger.

4. Before Each use: Check to make sure Blade and Blade Guard are securely in place. If necessary, tighten the Set Screws.

5. Quarterly (every 3 months) – tool Disassembly, cleaning, and inspection: Have the internal mechanism cleaned, inspected, and lubricated by a qualified technician.

Troubleshooting

2.Obstructed air flow.
3.Obstructed Trigger.
4.Incorrect lubrication or not enough lubrication.
5.Blocked air inlet screen (if equipped).
6.Air leaking from loose housing.
7.Mechanism contaminated.| 1.Check for loose connections and make sure that air supply is providing enough air flow (CFM) at required pressure (PSI) to the tool’s air inlet. Do not exceed maximum air pressure.
2.Use air filter to remove moisture and small particles in the air line.
3.Clean around Trigger to ensure free movement.
4.Lubricate using air tool oil and grease according to directions.
5.Clean air inlet screen of buildup.
6.Make sure housing is properly assembled and tight.
7.Have qualified technician
clean and lubricate mechanism. Install in-line filter in air supply as stated in Setup: Air Supply.
Housing heats during use.| 1.Incorrect lubrication or not enough lubrication.
2.Worn parts.| 1.Lubricate using air tool oil and grease according to directions.
2.Have qualified technician inspect internal mechanism and replace parts as needed.
Severe air leakage. (Slight air leakage is normal,
especially on
older tools.)| 1.Cross-threaded housing components.
2.Loose housing.
3.Damaged valve or housing.
4.Dirty, worn or damaged valve.| 1.Check for incorrect alignment and uneven gaps. If cross-threaded, disassemble and
replace damaged parts before use.
2.Tighten housing assembly. If housing cannot tighten properly, internal parts may be misaligned.
3.Replace damaged components.
4.Clean or replace valve assembly.
Poor quality cuts| 1.Worn Blade.
2.Loose Blade.| 1.Replace Blade.
2.Ensure Blade is properly seated and secured with tightened Set Screws.
Follow all safety precautions whenever diagnosing or servicing the tool. Disconnect air 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.

parts List

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.

26677 agoura road
calabasas, ca 91302
1-888-866-5797

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