MasterCraft 058-9331-2 User manual

INSTRUCTION MANUAL
AIR-POWERED HAMMER/CHISEL
058-9331-2

TABLE OF CONTENTS
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AIR-POWERED HAMMER/CHISEL 058-9331-2
QUICK START GUIDE
TECHNICAL SPECIFICATIONS 3
SAFETY GUIDELINES 4–10
KEY PARTS DIAGRAM 11
IMPORTANT INFORMATION 12–15
OPERATING INSTRUCTIONS 16–17
MAINTENANCE 18–19
TROUBLESHOOTING 20–21
EXPLODED VIEW 22
PARTS LIST 23
WARRANTY 24–25

SAFETY GUIDELINES
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AIR-POWERED HAMMER/CHISEL 058-9331-2
This manual contains information that relates to PROTECTING PERSONAL SAFETY and PREVENTING
EQUIPMENT PROBLEMS. It is very important to read this manual carefully and understand it
thoroughly before using the product. The symbols listed below are used to indicate this information.
Note - The word “Note” is used to inform the
reader of something he/she needs to know about
the tool.
PERSONAL SAFETY
These precautions are intended for the personal safety of the user and others working with the user.
Please take time to read and understand them.
DANGER!
Potential hazard that will result in serious
injury or loss of life.
WARNING!
Potential hazard that could result in
serious injury or loss of life.
CAUTION!
Potential hazard that may result in
moderate injury or damage to equipment.

SAFETY GUIDELINES
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AIR-POWERED HAMMER/CHISEL 058-9331-2
SAFETY GUIDELINES
DANGER!
Potential hazard that will result in serious injury or loss of life.
•Keep children away from the work area. Do not allow children to handle
power tools.
•Do not use this tool in the presence of flammable liquids or gases. Sparks
that are created during use may ignite gases.
•Do not point the tool toward yourself or other people. Keep hands, feet and
all other parts of the body clear from work area.
•Always ensure that the workpiece is firmly secured, leaving both hands free
to control the tool.
•Always ensure that the tool has stopped after use, for safety purposes and
to prevent possible damage to the tool/user.
•Do not use oxygen or any other combustible or bottled
gas to power air-powered tools. Failure to observe this
warning can cause explosion and serious personal injury
or death. Use only compressed air to power air-powered
tools. Use a minimum of 25’(7.6 m) of hose to connect
the tool to the compressor. Failure to comply will result in
serious injury or loss of life.
•Risk of bursting: Make sure the regulator is adjusted so
that the compressor outlet pressure is set lower than the
maximum operating pressure of the tool. Before starting
the compressor, pull the ring on the safety valve to make
sure the valve moves freely. Drain water from tank after
each use. Do not weld or repair tank. Relieve all pressure
in the hose before removing or attaching accessories.
•Risk of electric shock: Do not expose a compressor to rain. Store it indoors.
Disconnect the compressor from the power source before servicing.
Compressor must be grounded. Do not use grounding adaptors.
Oxygen
Hydrogen
Explosive
Combustible
MC-OM-02
MC-OM-22

SAFETY GUIDELINES
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AIR-POWERED HAMMER/CHISEL 058-9331-2
•Risk of personal injury: Do not direct compressed air from the air hose
toward the user or other people.
•Breathing risk: Never directly inhale the air produced by the compressor.
•Risk of bursting: Do not adjust the pressure switch or safety valve for any
reason. They have been preset at the factory for the compressor’s maximum
pressure. Tampering with the pressure switch or the safety valve may cause
personal injury or property damage.
•Risk of burns: The pump and the manifold generate high temperatures. In
order to avoid burns or other injuries, do not touch the pump, the manifold or
the transfer tube while the compressor is running. Allow the parts to cool
down before handling or servicing. Keep children away from the compressor
at all times.

SAFETY GUIDELINES
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AIR-POWERED HAMMER/CHISEL 058-9331-2
WARNING!
Potential hazard that could result in serious injury or loss of life.
•Do not allow unskilled or untrained individuals to operate the Air-powered
Hammer/Chisel.
•Always ensure that the accessories are specially designed/rated for use with
the tool. Also ensure they are secured and correctly fastened before
connecting the tool to the air supply.
•Use only lightweight coil type hoses to connect the tool to the compressor
coupling.
•Locate the compressor in a well-ventilated area for cooling, at a minimum of
12"(31 cm) away from the nearest wall.
•Protect the air hose and the power cord from damage and puncture. Inspect
them for weak or worn parts every week, and replace them if necessary.
•Always wear hearing protection when using the air compressor. Failure to do
so may result in hearing loss.
•Do not carry the compressor while it is running.
•Do not operate the compressor if it is not in a stable position.
•Do not operate the compressor on a rooftop ori n an elevated position that
could allow the unit to fall or be tipped over.

SAFETY GUIDELINES
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AIR-POWERED HAMMER/CHISEL 058-9331-2
CAUTION!
Potential hazard that may result in moderate injury or damage to
equipment.
•Always ensure that the tool has stopped before connecting it to the air
supply.
•Do not wear watches, rings, bracelets or loose clothing when using any air-
powered tool.
•Maintain proper footing at all times in order to ensure correct balance.
•Do not overload the tool. Allow the tool to operate at its optimum speed for
maximum efficiency.
•Do not use the tool if it is leaking air, has missing or damaged parts, or if it
requires repairs. Verify that all screws are securely tightened.
• For optimal safety and tool performance, inspect the tool daily in order to
ensure free movement of the trigger, safety mechanisms and springs.
•Always keep your air tool clean and lubricated. Daily lubrication is essential
to avoid internal corrosion and possible failures.
•Keep the work area clean. A cluttered or dirty workbench may lead to an
accident. Floors should be kept clear.
•Use the tool only in a well-ventilated area.
•Handling and storage of oil: Use with adequate ventilation. Avoid contact of
oil with eyes, skin, and clothing. Avoid breathing spray or mist. Store in a
tightly closed container in a cool, dry, well-ventilated area free from
incompatible substances.
•Do not use the tool when temperature of the work area is near or below
freezing, as doing so may cause tool failure.
•Do not store the tool in freezing temperatures to prevent ice formation on
the operating valves of the tool, as doing so may cause tool failure.

SAFETY GUIDELINES
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AIR-POWERED HAMMER/CHISEL 058-9331-2
Note: Recycle unwanted materials rather than disposing of them as waste. Sort the tools, hoses and
package in specific categories and take them to the local recycling centre or dispose of them in an
environmentally safe way.
VIBRATION PRECAUTION!
Potential hazard that could result in serious injury or loss of life.
• Read and follow the safety instructions before using the vibrating tool to
avoid temporary or permanent physical injury, particularly to the hands,
arms, and shoulders, and to reduce the risk of vibration-related injury.
•Do not use the vibrating tool continuously. Always ensure that the person
handling the vibrating tool for extended periods of time is examined by a
doctor periodically and free of medical problems.
•Do not allow a pregnant woman or person with improper blood circulation to
the hand, history of hand injury, nervous system disorder, diabetes or
Raynaud's Disease to operate the vibrating tool.
•Seek medical attention immediately for vibration-related symptoms such as
tingling, numbness, and white or blue fingers.
•Do not smoke while using the vibrating tool to avoid the risk of the
vibration-related injury.
•Use appropriate gloves to reduce the vibration effects on the hands.
•Hold the vibrating tool gently and safely.
•Stop the vibrating tool immediately if abnormal vibration occurs.

IMPORTANT INFORMATION
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AIR-POWERED HAMMER/CHISEL 058-9331-2
General usage description
The Mastercraft®Air-powered Hammer/Chisel features heat-treated impact parts for durability; an
alloy steel barrel and heat-treated piston and coil spring retainer to ensure the durability of internal
parts; and an ergonomic grip for comfort and stability and to reduce operator fatigue. The positive-
action trigger and built-in air regulator allow for simple power and speed control. An air inlet
(screened filter) keeps dirt and debris from damaging the tool. The standard quick change retention
spring means speed and ease when changing chisels. The exhaust is in the handle. The 6" (150
mm) Air-powered Hammer/Chisel set includes the four most popular demolition chisels. It is ideal for
light cutting, chipping, and scraping.
Compatible compressor and air tool
GUIDELINES FOR PROPER USAGE AND OPERATION
Always ensure the use of appropriately matched air tools and compressors. The compressor should
be able to supply a minimal air delivery of 2.8 SCFM @ 90 PSI to ensure the compressor can run
continuously with the Mastercraft Air-powered Hammer/Chisel. Using tools or a combination of tools
that together or separately require more volume of air than the volume that the air compressor can
deliver will reduce performance and could void the compressor or tool guarantee/warranty.
Air Compressor
Size & Power 2 HP 2 1/2 HP 3+ HP
5–6 Gallons Light-duty and
intermittent use
Light-duty and
intermittent use
Medium-duty and
intermittent use
8–11 Gallons Light-duty and
intermittent use
Medium-duty and
intermittent use
Heavy-duty and
continuous use
15+ Gallons Medium-duty and
intermittent use
Heavy-duty and
continuous use
Heavy-duty and
continuous use

IMPORTANT INFORMATION
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AIR-POWERED HAMMER/CHISEL 058-9331-2
• It is recommended that an automatic in-line filter-regulator-lubricator be used and be located
as close to the tool as possible.
• If a filter-regulator-lubricator is not installed, place up to six drops of oil directly into the air
inlet plug before each use.
• If a filter-regulator-lubricator is installed, keep the air filter clean. A dirty filter will reduce the
air pressure to the tool, which will cause a reduction in power, efficiency, and general
performance.
AIR TOOLS
Read this instruction manual thoroughly or have tool operators read thoroughly before using the tool.
• Read all safety guidelines
(see section “Safety guidelines”) at the beginning of this manual.
• Always inspect the air tool prior to each use to
– ensure proper use of power source.
– determine whether the tool is in proper working order.
• Drain the compressor tank daily. Water in the air-supply line will damage the tool.
• Clean air inlet and filter weekly.
• Line pressure should be increased to compensate for unusually long air hoses. The hose
diameter should be 3/8" (9.5 mm) ID. The fittings must have the same inside dimensions.
• Ensure that the trigger is not pressed before connecting the tool to the air supply.
CAUTION!
Potential hazard that may result in moderate injury or damage to
equipment.
•Verify that all connections in the air-supply system are sealed in order to
prevent air from leaking. Failure to comply may result in moderate injury or
damage to equipment.

IMPORTANT INFORMATION
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AIR-POWERED HAMMER/CHISEL 058-9331-2
WARNING!
Potential hazard that could result in serious injury or loss of life.
• Do not use the tool if it is not in proper working order.
• Do not use oxygen or any other combustible or bottled gas to power this tool.
• Do not use this tool in the presence of any flammable liquids or gases.
• Keep hose away from heat, oil and sharp edges. Check hose for wear and
tear.
• Ensure the air supply is clean and has a regulated pressure of 90 psi.
• Ensure that all connections are secure. Failure to comply could lead to serious
injury or loss of life.
CAUTION!
Potential hazard that may result in moderate injury or damage to
equipment.
• Use only the chisels and quick-retention spring specifically designed for this
Air-powered Hammer/Chisel. Failure to comply may result in moderate injury
or damage to equipment.

OPERATING INSTRUCTIONS
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AIR-POWERED HAMMER/CHISEL 058-9331-2
Operation
DANGER!
Potential hazard that will result in serious injury or loss of life.
•Keep children away from the work area. Do not allow children to handle power
tools.
WARNING!
Potential hazard that could result in serious injury or loss of life.
• Read all instructions in this manual carefully and understand them thoroughly
before using the Air-powered Hammer/Chisel.
• Ensure the air supply is clean and has a regulated pressure of 90 psi.
• Do not use additional and excessive force on the Air-powered Hammer/Chisel.
Failure to comply could result in serious injury or loss of life.
CAUTION!
Potential hazard that may result in moderate injury or damage to
equipment.
• Use the chisels specifically designed for this Air-powered Hammer/Chisel.
Failure to comply may result in moderate injury or damage to equipment.

MAINTENANCE
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AIR-POWERED HAMMER/CHISEL 058-9331-2
Storage
If it is necessary to store the tool for an extended period of time, apply a generous amount of
lubrication before storing. The tool should be allowed to run for approximately 30 seconds after
lubricating, in order to ensure that the lubrication is uniformly distributed throughout the tool.
Maintenance
CAUTION!
Potential hazard that may result in moderate injury or damage to
equipment.
• The tool should be stored in a clean and dry environment. Failure to comply
may result in moderate injury or damage to equipment.
DANGER!
Potential hazard that will result in serious injury or loss of life.
• Keep children away from the work area. Do not allow children to handle
power tools.
WARNING!
Potential hazard that could result in serious injury or loss of life.
• Disconnect the tool from the air supply before changing accessories,
servicing, or performing maintenance.
• Only use the tool after replacing or repairing any damaged parts or
accessories.
• Use only recommended and properly rated replacement parts. Failure to
comply could result in serious injury or loss of life.

TROUBLESHOOTING
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AIR-POWERED HAMMER/CHISEL 058-9331-2
Troubleshooting
The following chart lists common issues and solutions. Please read it carefully and follow all
instructions closely.
WARNING!
Potential hazard that could result in serious injury or loss of life.
• If any of the following symptoms appear while the tool is in use, turn it off and
disconnect it from the air supply immediately. Failure to heed this warning
could result in serious injury or loss of life.
• Disconnect the tool and the electrical plug from the air supply before making
any adjustments.
• Repairs must be performed by a qualified service technician only.
PROBLEM POSSIBLE CAUSES SOLUTIONS
Tool runs at normal
speed but loses
power under load.
1. Motor parts are worn or
damaged.
2. Cam clutch is worn or stuck due
to lack of lubricant.
1. Lubricate clutch housing.
2. Check for excess clutch oil. Clutch cases
should only be half filled, as overfilling can
cause drag on high-speed clutch parts. A
typical oiled/lubricated wrench requires ½
oz (14 ml) of oil.
Grease lubrication:
Heat is generated due to insufficient grease in
the chamber. Severe operating conditions may
require frequent lubrication.
If the problem persists, please contact
1-800-689-9928.