HARBOR FREIGHT 56990 Professional Medium Barrel Impact Hammer Owner’s Manual

HARBOR FREIGHT 56990 Professional Medium Barrel Impact Hammer Owner’s Manual

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.

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 which, if not avoided, will result in death or serious injury.
Warning| Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
Caution| Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
Notice Caution**| Addresses practices not related to personal injury.

IMPORTANT SAFETY INSTRUCTIONS

INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK, OR INJURY 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. 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.
   A dust mask, 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.

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

8. 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 too “live” and shock the operator

9. 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.

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

Tool Use and Care

1. Use clamps or another practical way to secure and support the work piece 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 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.
3. 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.
4. 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 trigger before leaving the work area.
5. 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.
6. 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.
7. 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.
8. 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 the lubricants supplied with the tool or specified by the manufacturer.

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.

SAVE THESE INSTRUCTIONS

Symbols and Specific Safety Instructions

Symbol Definitions

Symbol|

Property or statement

---|---

n o

| No-load speed

…/min

| Revolutions or reciprocation per minute

PSI

| Pounds per square inch of pressure

ft-lb

| Foot-pounds of torque

BPM

| Blows per minute

CFM

| Cubic Feet per Minute flow

SCFM

| Cubic Feet per Minute flow at standard conditions

Symbol

| Property or statement

NPT

| National pipe thread, tapered

NPS

| National pipe thread, straight
**| WARNING marking concerning Risk of Eye Injury. Wear ANSI-approved eye protection.
**| WARNING marking concerning Risk of Hearing Loss. Wear hearing protection.
**| WAR NING 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. Only use with accessories rated to handle the forces exerted by this tool during operation. Other accessories not designed for the forces generated may break and forcefully launch pieces.
3. Attach all accessories properly to the tool before connecting the air supply. A loose accessory may detach or break during operation.
4. Obey the manual for the air compressor used to power this tool.
5. Install an in-line shutoff valve to allow immediate control over the air supply in an emergency, even if a hose is ruptured.
6. Use this tool with both hands only. Using tools with only one hand can result in loss of control.
7. 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.

SAVE THESE INSTRUCTIONS

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

Warning

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, oilier, in-line shutoff valve, and quick couple for best service, as shown on Figure A on page 8 and Figure B. 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 oilier 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 couple plug and quick couple, will make operation more efficient, but are not required.
   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 tool’s 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.

**Figure A: Portable Air Supply 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| Couple and Plug| Provides quick connection and release
F| Leader Hose (optional)| Increases couple life
G| Air Cleaner / Dryer (optional)| Prevents water vapor from damaging work piece
H| Air Adjusting Valve (optional)| For fine tuning airflow at tool

Figure B: Stationary Air Supply Setup

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

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 :
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.

Note: Chisel sold separately.

Chisel Removal

1. Twist the Spring off the Cylinder using the back hook.
2. Remove the Chisel shank from the Spring and the Cylinder.

Figure C: Chisel Removal
To twist the Spring off, twist from the hook at the back.

Chisel Installation

1. Insert the Chisel shank through the Spring and into the front of the Cylinder.
2. Twist the Spring onto the threaded front of the Cylinder using the front hook.
   Note: The collar on the chisel must go under the spring to keep it from falling out.

Figure D: Chisel Installation
To twist the Spring on, twist from the hook at the front.

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 work pieces 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

1. If an automatic oilier is not used, add a few drops of Pneumatic Tool Oil to the airline connection before use. Add a few drops more after each hour of continual use.

2.  With the proper chisel attached to the Air Hammer, attach the air supply to the Air Inlet at the base on the Housing.

3. Turn on the air supply.

4. Press the chisel against the work surface and squeeze the Trigger to start the tool. Do not force the Air Hammer against the work surface. Easy, light pressure works best.

5. 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.
   CAUTION! TO PREVENT INJURY FROM TOOL OR ACCESSORY FAILURE: Do not exceed the tool’s maximum air pressure rating. If the tool still does not have sufficient force at maximum pressure and sufficient airflow, then a larger tool may be required.

6. To prevent accidents, turn off the tool, detach the air supply, safely discharge any residual air pressure in the tool, and release the trigger after use. Clean external surfaces of the tool with clean, dry cloth, and apply a thin coat of tool oil. Then store the tool indoors out of children’s reach.

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. 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. BEFORE EACH USE , inspect the general condition of the tool. Check for:

   • loose hardware or housing,
   • misalignment or binding of moving parts,
   • dull, chipped, or cracked chisels,
   • cracked or broken parts, and
   • any other condition that may affect its safe operation.

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

3. Quarterly (every 3 months) Tool Disassembly, Cleaning, and Inspection:
   Have the internal mechanism cleaned, inspected, and lubricated by a qualified technician.

Troubleshooting

Problem| Possible Causes|

Likely Solutions

---|---|---
Decreased output.|

1. Not enough air pressure and/ or air flow.
2. Obstructed trigger.
3. Incorrect lubrication or not enough lubrication.
4. Blocked air inlet screen (if equipped).
5. Air leaking from loose housing.
6. 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. Clean around trigger to ensure free movement.

3. Lubricate using air tool oil according to directions.

4. Clean air inlet screen of buildup.

5. Make sure housing is properly assembled and tight.

6. Have qualified technician clean and lubricate mechanism.
   Install in-line filter in air supply as stated in Setup: Air Supply.

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. Technician needs to disassemble tool, align parts and reassemble.

3. Replace damaged components.

4. Clean or replace valve assembly.

Housing heats during use.|

1. Incorrect lubrication or not enough lubrication.
2. Worn parts.

|

1. Lubricate using air tool oil according to directions.
2. Have qualified technician inspect internal mechanism and replace parts as needed.

Follow all safety precautions whenever diagnosing or servicing the tool. Disconnect air supply before service.

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 List and Assembly Diagram

Part| Description|

Qty

---|---|---
1| Cylinder| 1
2| Piston| 1
3| Front End-Plate| 1
4| Washer| 1
5| Valve Pin B| 1
6| Valve Pin A| 1
7| Rear End-Plate| 1
8| Screw| 1
9| Trigger| 1
10| Throttle Pin| 1
11| Valve Sleeve| 1
12| Reinforced Seal| 1
13| Throttle Valve| 1
14| Valve Spring| 1
15| Housing| 1
16| Inlet Washer| 1
17| O-Ring| 1
18| Air Inlet| 1
19| Grip| 1
20| Spring Pin| 1
21| Spring| 1

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.

Copyright

Copyright© 2019 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.

Customer Support

Visit our website at:http://www.harborfreight.com
Email our technical support at: productsupport@harborfreight.com
For technical questions, please call 1-888-866-5797.

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