INSTRUCTION MANUAL
AIR-POWERED
IMPACT WRENCH
058-9321-6
TABLE OF CONTENTS
2
AIR-POWERED IMPACT WRENCH 058-9321-6
QUICK START GUIDE
TECHNICAL SPECIFICATIONS 3
SAFETY GUIDELINES 4–9
KEY PARTS DIAGRAM 10
IMPORTANT INFORMATION 11–13
OPERATING INSTRUCTIONS 14–15
MAINTENANCE 16–17
TROUBLESHOOTING 18–19
EXPLODED VIEW 20
PARTS LIST 21
WARRANTY 22–23
SAFETY GUIDELINES
4
AIR-POWERED IMPACT WRENCH 058-9321-6
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
r
eader of something he/she needs to know about
t
he 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!
P
otential hazard that will result in serious
i
njury or loss of life.
WARNING!
P
otential hazard that could result in
s
erious injury or loss of life.
CAUTION!
Potential hazard that may result in
m
oderate injury or damage to equipment.
SAFETY GUIDELINES
5
AIR-POWERED IMPACT WRENCH 058-9321-6
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.
• 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.
• A
lways ensure that the workpiece is firmly secured leaving both hands free
to control the tool.
• A
lways ensure that the tool has stopped before putting it down after use, for
safety purpose and to prevent possible damage to the tool/user.
• K
eep proper footing at all times in order to ensure correct balance.
• Do not use oxygen or any other combustible or bottled
g
as to power air-powered tools. Failure to observe this
warning can cause explosion and serious personal injury
or death. Use only the compressed air to power the
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 electric shock: Do not expose the compressor to rain. Store it
indoors. Disconnect the compressor from power source before servicing.
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 personnel.
• Risk of inhallation: Never inhale the air produced by a compressor. Failure to
comply will result in serious injury or loss of life.
Oxygen
Hydrogen
Explosive
Combustible
MC-OM-02
SAFETY GUIDELINES
6
AIR-POWERED IMPACT WRENCH 058-9321-6
• 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 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.
• 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 that 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.
MC-OM-22
SAFETY GUIDELINES
7
AIR-POWERED IMPACT WRENCH 058-9321-6
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.
• A
lways ensure that the accessories such as impact sockets are specially
d
esigned for use with the tool. Also ensure they are secured and correctly
fastened before connecting the tool to the air supply.
• D
o not use the Air-powered Impact Wrench for any task other than that
w
hich it is designed to perform.
• D
o not use Air-powered Impact Wrench unless you have been instructed on
i
ts use. Only a qualified person should use the tool.
• P
ull the pressure safety valve ring of the compressor everyday in order to
ensure that the valve is functioning properly.
• L
ocate the compressor in a well-ventilated area for cooling, and a minimum
of 12" (31 cm) away from the nearest wall.
• P
rotect the air hose and the power cord from damage and puncture. Inspect
t
hem for weak or worn spots every week, and replace them if necessary.
• A
lways wear hearing protection when using an air compressor. Failure to do
so may result in hearing loss.
• D
o not carry the compressor while it is running.
• D
o not operate the compressor if it is not in a stable position.
• D
o not operate the compressor on a rooftop or in an elevated position that
could allow the unit to fall or be tipped over.
SAFETY GUIDELINES
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AIR-POWERED IMPACT WRENCH 058-9321-6
CAUTION!
Potential hazard that may result in moderate injury or damage to
e
quipment.
• Always ensure that the tool has stopped before connecting to the air supply.
• D
o not wear watches, rings, bracelets, or loose clothing when using any air
tool.
• D
o not overload the tool. Allow the tool to operate at its optimum speed for
maximum efficiency.
• Do not use a tool that is leaking air, with missing or damaged parts, or that
requires repairs. V
erify that all screws are securely tightened.
• For optimal safety and tool performance, i
nspect the tool daily in order to
ensure free movement of the trigger, safety mechanisms, and springs.
• A
lways keep your air tool clean and lubricated. Daily lubrication is essential
to avoid internal corrosion and possible failures.
• E
nsure that the floor is not slippery and wear non-slip shoes. Floors should
be kept clean and clear.
• A
lways follow all workshop safety rules, regulations, and conditions when
using the Air-powered Impact Wrench.
• D
o not carry the tool by the air hose.
• D
o not use the tool near or below freezing temperatures, as doing so may
cause tool failure.
• D
o not store the tool in a freezing environment to prevent ice formation on
the operating valves of the tool, as doing so may cause tool failure.
• H
andling 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.
IMPORTANT INFORMATION
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AIR-POWERED IMPACT WRENCH 058-9321-6
Compatible compressor and air tool
GUIDELINES FOR PROPER USE AND OPERATION
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 5 SCFM @ 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.
General use
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.
Read this Instruction Manual carefully before using the tool.
• Read and follow all the safety instructions at the beginning of this manual. Inspect the
Air-powered Impact Wrench prior to each use in order to:
– Ensure that the proper power source is being used.
– Verify that the tool is in proper working order.
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 IMPACT WRENCH 058-9321-6
• 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.
Air system
• Always use clean, dry, regulated, compressed air at the recommended pressure
(see section
“Technical specifications”)
.
• Do not exceed the maximum and minimum pressures. Operating the tool at the wrong
pressure (too low or too high) could cause personal injury, excessive noise, or rapid wear.
• 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.
• 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.
MAINTENANCE
17
AIR-POWERED IMPACT WRENCH 058-9321-6
• If a filter-regulator-lubricator is not installed in the system, lubricate the tool at least once a
day or for every 2 hours of use, based on the work environment.
• Use only the recommended lubricating oil, specially made for pneumatic applications.
Substitutes may harm the rubber compounds, O-rings, and other parts in the tools.
• 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.
N
ote: When the temperature is below freezing, keep tools as warm as possible using any safe,
convenient method.
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.
CAUTION!
Potential hazard that may result in moderate injury or damage to
e
quipment.
• Never use damaged parts.
• Do not use an excessively worn tool. Failure to comply may result in moderate
injury or damage to equipment.
TROUBLESHOOTING
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AIR-POWERED IMPACT WRENCH 058-9321-6
The following chart lists common issues and solutions. Please read it carefully and follow all
instructions closely.
• Disconnect the tool from the air supply before making any adjustments.
• Repairs must be performed in an authorized service center only.
N
ote: For further repair information, please call 1-800-689-9928.
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.
PROBLEM POSSIBLE CAUSES SOLUTIONS
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.
1. Repair or replace the parts.
2. Lubricate the parts.
N
ote: If the air tool is used for an extended
period, it is recommended to lubricate regularly.
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 less.
1. Check if there is blockage in air inlet filter.
2. Pour lubricating oil into air inlet as per
instructions.
3. Operate the tool by reversing the rotation in
back and forth direction in short
duration (
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 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.
TROUBLESHOOTING
19
AIR-POWERED IMPACT WRENCH 058-9321-6
PARTS LIST
21
AIR-POWERED IMPACT WRENCH 058-9321-6
If any parts are missing or damaged and if you have any questions, please call 1-800-689-9928.
No. Description Qty. No. Description Qty.
1 Bolt M3 X 4 1 23 Reverse valve sleeve 1
2 Hammer case 1 24 Reverse valve seat 1
3 Anvil bushing 1 25 O-ring 48 X 1.8 1
4 Anvil collar 1 26 O-ring 34.2 X 1.5 1
5 O-ring 7.65 X 1.8 1 27 Regulator knob 1
6 Square drive 1 28 Spring 1
7 Hammer pin 2 29 Steel ball 1
8 Hammer dog 2 30 Gasket 1
9 Hammer cage 1 31 Bolt M5 X 88.5 4
10 Washer 1 32 Trigger 1
11 Front washer 1 33 O-ring 4.5 X 1 1
12 Bearing 1 34 Air inlet set 1
13 O-ring 54.5 X 1 1 35 Retainer ring 1
14 Cylinder plate 1 36 Knob cover 1
15 Rotor 1 37 Throttle valve bushing 1
16 Rotor blade 6 38 Valve stem 1
17 Gun body 1 39 Spring 1
18 Cylinder 1 40 O-ring 16 X 2.5 1
19 Bearing 1 41 Spring 1
20 Retainer ring 1 42 Air deflector 1
21 Seal washer 1 43 Washer 1
22 Rear washer 1 44 Air inlet plug 1
WARRANTY
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AIR-POWERED IMPACT WRENCH 058-9321-6
Mastercraft® limited warranty
These warranties are subject to the following conditions and limitations:
a. A bill of sale verifying the purchase and purchase date must be provided.
b. 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.
c. 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.
d. 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.
e. This warranty will not apply where damage is caused by repairs made or attempted by others
(i.e., persons not authorized by the manufacturer).
f. 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).
This Mastercraft
®
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 p
roof 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.
WARRANTY
23
AIR-POWERED IMPACT WRENCH 058-9321-6
g. 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.
h. This warranty will not apply to normal deterioration of the exterior finish, such as, but not
limited to, scratches, dents, paint chips, or to any corrosion or discoloring by heat, or
abrasives and chemical cleaners.
i. 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.
Additional limitations
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.
Notice to consumer
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.
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