model no. 058-9803-0
OPERATING
MANUAL
IMPORTANT :
For your own safety, read and follow all of the Safety Guidelines
and Operating Instructions before operating this Impact wrench.
Keep this manual for future reference.
AIR-POWERED
IMPACT WRENCH
TECHNICAL SPECIFICATIONS
SAFETY GUIDELINES
KEY PARTS DIAGRAM
TECHNICAL INFORMATION
OPERATING INSTRUCTIONS
MAINTENANCE
TROUBLESHOOTING
EXPLODED VIEW
PARTS LIST
WARRANTY
TABLE OF CONTENTS
NOTE:
If any parts are missing or damaged, or if you
have any questions, please call our toll-free helpline at
1-800-689-9928.
SAVE THESE INSTRUCTIONS
This manual contains important safety and operating instructions. Read all instructions and follow
them with use of this product.
4
5
10
11
14
16
18
20
21
22
3
NOTE: The word “Note” is used to inform the reader of
something he/she needs to know about the tool.
SQUARE DRIVE
SPEED (NO LOAD)
MAXIMUM TORQUE
CF REQUIREMENT
WORKING PRESSURE
AIR INLET
AIR HOSE REQUIRED
WEIGHT
1/2" (12.7 mm)
7500 RPM
450 ft-lb
3.7 CFM @ 90 PSI
90 PSI
1/4"-18 NPT
3/8" (9.5 mm)
4 lb 6 oz (2.1 kg)
CFM: Cubic Feet per Minute (the volumetric flow rate of air corrected to
standardized conditions of temperature and pressure).
NPT: National Pipe Thread.
TECHNICAL SPECIFICATIONS
54
model no. 058-9803-0 | contact us 1-800-689-9928
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.
Make sure you read and understand this manual before using this tool. Make sure other users
read and understand this manual before they use the tool.
SAFETY GUIDELINES
PERSONAL SAFETY
Potential hazard that will result in serious
injury or death.
Potential hazard that could result in
serious injury or death.
Potential hazard that may result in
injury or damage to equipment.
WARNING!
CAUTION!
DANGER!
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.
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model no. 058-9803-0 | contact us 1-800-689-9928
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 only compressor. Failure to
comply will result in serious injury or death.
Risk of inhalation: Never directly inhale the air produced by the
compressor.
Risk of electric shock: Do not expose a compressor to rain.
Store it indoors. Disconnect the compressor from the power
source before servicing. The compressor must be grounded.
Do not use grounding adaptors.
Risk of personal injury: Do not direct compressed air from the air hose
towards the user or other people or animal.
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 and pets away from the
compressor at all times.
Risk of bursting: Do not adjust the pressure switch or safety valve for any
reason. They have been preset at the factory for this compressor’s maximum
pressure. Tampering with the pressure switch or the safety valve may cause
personal injury or property damage.
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 the tank after each use. Do not weld
nor repair the tank. Relieve all pressure in the hose
before removing or attaching accessories.
SAFETY GUIDELINES
SAFETY GUIDELINES
SAFETY GUIDELINES
• Keep children away from the work area. Do not allow
children to handle power tools.
• Keep air hose away from heat, oil, and sharp edges.
Check air hose for wear before each use and ensure
that all connections are proper.
• Always ensure that the workpiece is firmly secured
leaving both hands free to control the tool.
• Always ensure that the tool has stopped before
putting it down after use, for safety purpose and to
prevent possible damage to the tool/user.
• Keep proper footing at all times in order to ensure
correct balance.
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.
• Do not allow inexperienced or untrained individuals to operate
the Air-powered Impact Wrench.
• Always ensure that the accessories such as impact sockets
are specially designed for use with the tool. Also ensure they
are secured and correctly fastened before connecting the
tool to the air supply.
• Do not use the Air-powered Impact Wrench for any task other
than that which it is designed to perform.
• Do not use Air-powered Impact Wrench unless you have been
instructed on its use. Only a qualified person should use the
tool.
• Pull the pressure safety valve ring of the compressor everyday
in order to ensure that the valve is functioning properly.
• Locate the compressor in a well-ventilated area for cooling,
and 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 spots every week,
and replace them if necessary.
Disconnect tool from the air supply and turn off
the compressor before performing any maintenance,
or changing accessories, when the tool is not in use,
when it is being handed to another person, and
when it is left unattended. Failure to comply may
result in injury or damage to equipment.
Use safety goggles and ear protection:
Wear safety glasses with side shields when
operating the tool/compressor and verify that
others in the work area are also wearing safety
glass. Safety glasses must provide protection from
flying particles from the front and the sides.
Air-powered tools are loud and the sound can cause
hearing damage. Always wear ear protection to
prevent hearing damage and loss. Failure to
comply may result in injury.
OIL DAIL
Y
MC-588423-12
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model no. 058-9803-0 | contact us 1-800-689-9928
CAUTION!
Potential hazard that may result in injury or damage to
equipment.
CAUTION!
Potential hazard that may result in injury or damage to
equipment.
Note: Recycle unwanted materials rather than disposing of them as waste. Sort
the tools, hoses, and packaging in specific categories and take them to the local
recycling centre or dispose of them in an environmentally safe way.
SAFETY GUIDELINES
SAFETY GUIDELINES
• Keep proper footing at all times in order to ensure correct balance.
• Do not use a tool that is leaking air, that has missing or damaged parts, or
that 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.
• Check the tightness of screws before operating the tool. Before operating
the tool, make sure all the screws and caps are securely tightened to
prevent leakage.
• Keep the work area clean. A cluttered or dirty workbench may lead to an
accident. Floors should be kept clear.
• 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 near or below freezing temperatures, as doing so may
cause tool failure.
• Do not store the tool in a freezing environment to prevent ice formation on
the operating valves of the tool, as doing may cause tool failure.
• Use safety goggles and ear protection. Wear safety glasses
with side shields when operating the tool/compressor and
verify that others in the work area are also wearing safety
glasses. Safety glasses must conform to American National
Standards Institute (ANSI Z87.1) requirements and must
provide protection from flying particles from the front and
the sides.
Air-powered tools are loud and the sound can cause hearing
damage. Always wear ear protection to help prevent hearing
damage and loss. Failure to comply may result in moderate
injury.
MC-OM-01
No.
1
2
Square drive
Housing
Air inlet plug3
No.
4
5
6
Trigger
Power Setting
Always ensure that a suitable air compressor is used with this Mastercraft® Air-powered Impact
Wrench. The compressor should be able to supply a minimal air delivery of 4 CFM @ 90 PSI to
ensure the compressor can run continuously with the Mastercraft Air-powered Impact Wrench. Using
a tool or combinations of tools that together or separately require more than compressor capacity
will reduce performance and could void the guarantee/warranty of compressor or tool.
This Mastercraft® Air-powered Impact Wrench features a twin-hammer mechanism for higher
torque, an adjustable (3 position) torque regulator, and variable speed adjustment. The tool has a
front exhaust. The tool is mainly used for removing and installing nuts and bolts and automotive lug
nuts on tires, and for general assembly work. The sheer power and performance of the tool enables
the operator to tackle the toughest jobs with ease. The tool is durable and economical to use.
General use
Compatible compressor and air tool
GUIDELINES FOR PROPER USE AND OPERATION
Air deflector
Description Description
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model no. 058-9803-0 | contact us 1-800-689-9928
Air Compressor
Size and Power
2 HP 2 1/2 HP 3 HP and more
5–6 Gallons
8–11 Gallons
15 Gallons
and more
Light-duty and
intermittent use
Light-duty and
intermittent use
Medium-duty and
intermittent use
Light-duty and
intermittent use
Medium-duty and
intermittent use
Heavy-duty and
continuous use
Light-duty and
intermittent use
Medium-duty and
intermittent use
Heavy-duty and
continuous use
WARNING!
Potential hazard that could result in serious injury or
loss of life.
• Do not use if the tool is not in proper working order.
• Do not use oxygen or any other combustible or bottled gas to power
the tool.
• Do not use this tool in the presence of any flammable liquids or gases.
• Always keep the hoses away from heat, oil, and sharp edges. Check
hoses for wear and ensure that all connections are tightened.
• Keep hands and other parts of the body away from
the tool’s discharge and working areas when
connecting it to the air supply.
WARNING!
Potential hazard that could result in serious injury or
loss of life.
Mastercraft® Air-powered Impact
Wrench
DescriptionNo. No.
6
7
8
9
1
2
3
Regulator 0 -123 PSI( 0-8.5 bar)
Filter
Cut-off valve
Air compressor
Description
2
5
7
1
3
3
6
8
9
4
Quick coupler
Quick connector
Air hose
Lubricator
4
5
13
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model no. 058-9803-0 | contact us 1-800-689-9928
Air system
Always use clean, dry, regulated, compressed air at 4.8 to 7.5 bar (70 to 110 PSI).
Do not exceed the maximum or minimum pressures. Operating the tool at the wrong
pressure (too low or too high) will cause excessive noise or rapid wear.
• Always use impact sockets specifically designed for this Air-powered Impact Wrench.
• Ensure that air is supplied at regulated pressure and the air flow is maintained as per
specifications.
• Drain the compressor tank daily. Water in the air line will damage the impact wrench.
• Clean the air inlet filter weekly.
• Increase the line pressure to compensate for an unusual long air hose (longer than 8 m). The
minimum hose diameter (I.D) should be 1/4" (6.4 mm) and the fittings must have the same
inner dimensions.
• It is recommended that an automatic in-line filter-regulator-lubricator be used and be located
as close to the tool as possible. This increases tool life and keeps the tool in good working
order.
• Regularly check the in-line lubricator and fill it with lubricating oil.
• If a filter-regulator-lubricator is not installed, place up to 6 drops of lubricating oil into the air
inlet plug before each use and for every 2 hours of 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 leads to power reduction, less efficiency, and poor performance
of the tool.
• For proper adjustment of the in-line lubricator, place a sheet of paper next to the exhaust
ports and hold the throttle open for approximately 30 seconds. The lubricator is properly set
when a light stain of oil collects on the paper. Excessive amount of oil should be avoided.
WARNING!
Potential hazard that could result in serious injury or
loss of life.
• Carefully read all instructions in this manual and
understand them thoroughly before using the Air powered Impact Wrench. Failure to comply could
result in serious injury or loss of life.
4. Press the trigger (1) of the tool for
rotating operation (Fig. C).
• Keep children away from the tools and work areas.
• Do not apply additional force to the Air-powered
Impact Wrench in order to remove a nut.
• Do not allow the Air-powered Impact Wrench to run
free for an extended period of time. Doing so will
shorten the life of the impact wrench. Failure to
comply could lead to serious injury or loss of life.
WARNING!
Potential hazard that could result in serious injury or
loss of life.
NOTE: Use only the impact sockets that are specifically
designed for use with this Air-powered Impact Wrench.
2. Attach the socket (1) of required size to
the drive head (2) of the tool (Fig. B).
3. Place the socket over the nut to be
removed or installed.
5. Adjust the regulator knob (1) at the rear
end of the tool to control the speed of
the air flow and to adjust the direction of
rotation (forward and reverse) (Fig. D).
1. Plug in compressor, turn it on, set the
pressure regulator to 90 PSI, attach one
end of the air hose to the compressor
and the other end of the air hose (1) to
the tool (2) (Fig. A).
OPERATION
6. Verify that the air supply is clean and
that air pressure does not exceed 90 PSI
(6.3 bar) while operating the Air-powered
Impact Wrench.
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model no. 058-9803-0 | contact us 1-800-689-9928
17
WARNING!
Potential hazard that could result in serious injury or
loss of life.
• Replace or repair damaged parts or accessories before
using the Air-powered Impact Wrench.
• Use only recommended and properly rated replacement
parts. Non-authorized parts may be dangerous and will
void the warranty.
• Disconnect the Air-powered Impact Wrench from the
air supply before changing accessories, servicing, or
performing maintenance. 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.
• Never use damaged parts.
• Do not use an excessively worn tool. Failure to comply
may result in moderate injury or damage to equipment.
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None
X X
X
See below X
MAINTENANCE
REQUIRED
TOOLS OR
MATERIALS
REQUIRED
DESCRIPTION
Each Use or
every 2 Hrs
MAXIMUM SERVICE INTERVAL
Monthly
As
Needed
General inspectionfree movement
In-depth inspection
Replace worn or
broken parts
Lubrication
Trigger, spring,
safety mechanism
Worn or broken
parts
Pneumatic tool
oil
Maintenance
• Lubrication: If the Air-powered Impact
Wrench and the compressor are not equipped
with an in-line lubrication system, place up
to 6 drops of pneumatic tool oil into the air
inlet before each work day or after every 2
hours of continuous use, depending on the
characteristics of the workpiece and type
of fasteners used.
• Air-operated tools must be inspected periodically and worn or broken parts must be
replaced to ensure that the tools are operating safely and efficiently.
• Inspect and replace worn or damaged O-rings, seals, etc. Tighten all screws and caps
frequently in order to help prevent personal injury.
• Keep the magazine of the tool clean and free of any dirt or abrasive particles.
X
• The tool should be properly lubricated by keeping the in-line lubricator filled and correctly
adjusted. Without proper lubrication, the tool will not work effectively and parts will wear
prematurely.
• Inspect the tool periodically and replace worn or broken parts in order to keep tools operating
safely and efficiently.
• Tighten all screws and caps frequently in order to prevent personal injury.
• Inspect the trigger, the spring, and safety mechanism for free movement on a regular basis in
order to ensure that the safety system is fully functional. Verify that no parts are loose or
missing.
Storage
• When the tool is not in use, disconnect it from the air supply, clean, and store it in a safe, dry,
childproof location.
• When the tool is stored for longer period of time, apply an ample amount of lubricating oil
before storing.
• Run the tool for approximately 30 seconds after lubricating, in order to ensure that the
lubrication is uniformly distributed throughout the tool. Store the tool in a clean and dry
environment.
1918
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
will result in serious personal injury.
• Disconnect the tool from the air supply before making
any adjustments.
• Repairs must be performed in an authorized service
centre only.
NOTE: For further repair information, please
call 1-800-689-9928.
model no. 058-9803-0 | contact us 1-800-689-9928
Troubleshooting
The following chart lists common issues and solutions. Please read it
carefully and follow all instructions closely.
Tool runs at
normal speed
but loses
speed under
load.
1. Motor parts are worn
or damaged.
2. Rotor blade is worn or
stuck due to lack of
lubricant.
PROBLEM POSSIBLE CAUSES SOLUTIONS
1. Repair or replace the parts.
2. Lubricate the parts.
Note: If the air tool is used for an
extended period, it is
recommended to lubricate
regularly.
PROBLEM POSSIBLE CAUSES SOLUTIONS
Tool runs at
low speed.
Air flows
slightly from
exhaust.
1. Dirt particles are
jammed in motor.
2. Power regulator is in
closed position.
3. Air flow is blocked
by dirt.
4. Air supply is too low.
1. Check if there is a blockage in air inlet
filter.
2. Pour lubricating oil into the air inlet
as per instructions.
3. Operate the tool by reversing the
rotation in a back and forth direction
in short durations (wherever
applicable).
4. Check for obstructions in the air
supply.
Tool stops
working.
Air flows
freely from
exhaust.
One or more motor
vanes got stuck
due to material build up.
1. Pour air tool lubricating oil into air
inlet.
2. Operate the tool in short bursts by
quickly reversing the rotation in a back
and forth direction (wherever
applicable).
3. Tap motor housing gently with
plastic mallet.
4. Disconnect the air supply. Operate
the motor by manually rotating the
drive shank(wherever applicable).
Tool does
not shut off.
O-rings in the throttle
valve are dislodged
from the seat inlet valve.
Replace O-rings.
1
2
3
4
5
6
7
8
9
10
11
12
13
31
30
29
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
44
32
43
33
42
34
35
37
36
39
38
40
41
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Filling cup
Housing cover
Hammer case gasket 1
Valve sleeve
Anvil Bushing
O-ring 7.5x1.8
Anvil
Hammer Frame
Hammer pin
Hammer
Ball bearing 16002
Front cover
Rotor
Rotor blade
Pin 4 x 46
Cylinder
Back cover
Ball bearing 6001
Retainer 12
Housing
Hammer case gasket 2
O-ring 52.7 x 1.8
1
1
1
1
1
1
1
1
2
2
1
1
1
6
1
1
1
1
1
1
1
1
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Regulator Assembly
O-ring 34 x 2.4
Sealing Cap
Spring
Steel ball dw=4
Bolt M5 x 88.5
Pin 2.5 x 23
O-ring 3 x 1
Trigger
Pin 2.5 x 21
O-ring 37.5 x 2.65
Exhaust cover
Gasket
O-ring 15 x 2.65
Collet 15
Silencer cap
Block
Pin
Compressed spring
Air inlet
Pin 2.5 x 30
Logo
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
2
PARTS LIST
21
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model no. 058-9803-0 | contact us 1-800-689-9928
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model no. 058-9803-0 | contact us 1-800-689-9928
3-Year Limited Warranty
This product is guaranteed for a period of 3 years from the date of original retail purchase
against defects in workmanship and materials, except for the following component:
Component A: Accessories, which are guaranteed for a period of 1-year from the date of
original retail purchase against defects in workmanship and materials.
Subject to the conditions and limitations described below, this product, if returned to us
with proof of purchase within the stated warranty period and if covered under this
warranty, will be repaired or replaced (with the same model, or one of equal value or
specification), at our option. We will bear the cost of any repair or replacement and any
costs of labor relating thereto.
These warranties are subject to the following conditions and limitations:
A bill of sale verifying the purchase and purchase date must be provided.
This warranty will not apply to any product or part thereof which is worn or broken or
which has become inoperative due to abuse, misuse, accidental damage, neglect, or lack
of proper installation, operation, or maintenance (as outlined in the applicable instruction
manual or operating instructions), or which is being used for industrial, professional,
commercial, or rental purposes.
This warranty will not apply to normal wear and tear or to expendable parts or accessories
that may be supplied with the product which are expected to become inoperative or
unusable after a reasonable period of use.
This warranty will not apply to routine maintenance and consumable items such as, but
not limited to, fuel, lubricants, vacuum bags, blades, belts, sandpaper, bits, fluids,
tune-ups, or adjustments.
This warranty will not apply where damage is caused by repairs made or attempted by
others (i.e., persons not authorized by the manufacturer).
This warranty will not apply to any product that was sold to the original purchaser as a
reconditioned or refurbished product (unless otherwise specified in writing).
a)
b)
c)
d)
e)
f)
This warranty will not apply to any product or part thereof if any part from
another manufacturer is installed therein or any repairs or alterations have
been made or attempted by unauthorized persons.
This warranty will not apply to normal deterioration of the exterior finish, such
as, but not imited to, scratches, dents, paint chips, or to any corrosion or
discoloring by heat, or abrasives and chemical cleaners.
This warranty will not apply to component parts sold by and identified as the
product of another company, which shall be covered under the product
manufacturer’s warranty, if any.
g)
h)
i)
This warranty applies only to the original purchaser and may not be
transferred. Neither the retailer nor the manufacturer shall be liable for any
other expense, loss or damage, including, without limitation, any indirect,
incidental, consequential, or exemplary damages arising in connection with
the sale, use, or inability to use this product.
This warranty gives you specific legal rights, and you may have other rights,
which may vary from province to province. The provisions contained in this
warranty are not intended to limit, modify, take away from, disclaim, or
exclude any statutory warranties set forth in any applicable provincial or
federal legislation.
Additional limitations
Notice to consumer
Made in China
Imported by Mastercraft Canada Toronto, Canada M4S 2B8
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