MasterCraft 054-7534-0 User manual

IMPORTANT:
Read and understand this instruction manual
thoroughly before using the product.
INSTRUCTION
MANUAL
1/2” (13 MM)
BRUSHLESS IMPACT WRENCH
054-7534-0

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TABLE OF CONTENTS
Technical Specifications 4
Safety Guidelines 5
Key Parts Diagram 10
Operating Instructions 11
Maintenance 16
Troubleshooting 17
Parts List 18
Warranty 20
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.
TABLE OF CONTENTS

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TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
Rated Voltage 20 V d.c.
Max. Torque 190 ft-lb
No-load Speed 0–2300 RPM
Impact Rate 0–3000 BPM
Output Driver 1/2” (13 mm) Square
*Maximum battery voltage without workload; with workload nominal voltage is 18V.

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SAFETY GUIDELINES:
WARNING!
Safety symbols in this Instruction Manual are used to flag possible dangers. The safety
symbols and their explanations require your full understanding. The safety warnings do not,
by themselves, eliminate any danger, nor are they substitutes for proper accident prevention
measures.
WARNING!
This Safety Alert Symbol indicates caution, warning, or danger. Failure to obey a safety
warning can result in serious injury to yourself or others. To reduce the risk of injury, fire, or
electric shock, always follow the safety precautions.
KNOW YOUR TOOL
To operate this tool, carefully read this Instruction Manual and all labels affixed to the cordless impact
wrench before using. Keep this instruction manual available for future reference.
IMPORTANT
This tool should only be serviced by a qualified service technician. For more information, call the toll-
free helpline at 1-800-689-9928.
READ ALL INSTRUCTIONS THOROUGHLY
SAVE THESE INSTRUCTIONS.
GENERAL POWER TOOL SAFETY WARNINGS
WARNING!
Read all safety warnings, instructions, illustrations and specifications provided
with this power tool. Failure to follow all instructions listed below may result in electric
shock, fire and/or serious injury.
SAVE ALL WARNINGS AND INSTRUCTIONS FOR FUTURE REFERENCE.
The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-
operated (cordless) power tool.
WORK AREA SAFETY
• Keep work area clean and well lit. Cluttered or dark areas invite accidents.
• Do not operate power tools in explosive atmospheres, such as in the presence of
flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.
• Keep children and bystanders away while operating a power tool. Distractions can cause
you to lose control.
SAFETY GUIDELINES

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ELECTRICAL SAFETY
• Power tool plugs must match the outlet. Never modify the plug in any way. Do not use
any adaptor plugs with earthed (grounded) power tools. Unmodified plugs and matching
outlets will reduce risk of electric shock.
• Avoid body contact with earthed or grounded surfaces, such as pipes, radiators,
ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or
grounded.
• Do not expose power tools to rain or wet conditions. Water entering a power tool will
increase the risk of electric shock.
• Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the
power tool. Keep cord away from heat, oil, sharp edges or moving parts. Damaged or
entangled cords increase the risk of electric shock.
• When operating a power tool outdoors, use an extension cord suitable for outdoor use.
Use of a cord suitable for outdoor use reduces the risk of electric shock.
• If operating a power tool in a damp location is unavoidable, use a ground fault circuit
interrupter (GFCI) protected supply. Use of an GFCI reduces the risk of electric shock.
PERSONAL SAFETY
• Stay alert, watch what you are doing and use common sense when operating a power
tool. Do not use a power tool while you are tired or under the influence of drugs,
alcohol or medication. A moment of inattention while operating power tools may result in
serious personal injury.
• Use personal protective equipment. Always wear eye protection. Protective equipment
such as a dust mask, non-skid safety shoes, hard hat or hearing protection used for appropriate
conditions will reduce personal injuries.
• Prevent unintentional starting. Ensure the switch is in the off-position before
connecting to power source and/or battery pack, picking up or carrying the tool.
Carrying power tools with your finger on the switch or energising power tools that have the
switch on invites accidents.
• Remove any adjusting key or wrench before turning the power tool on. A wrench or a
key left attached to a rotating part of the power tool may result in personal injury.
• Do not overreach. Keep proper footing and balance at all times. This enables better
control of the power tool in unexpected situations.
• Dress properly. Do not wear loose clothing or jewellery. Keep your hair and clothing
away from moving parts. Loose clothes, jewellery or long hair can be caught in moving parts.
• If devices are provided for the connection of dust extraction and collection facilities,
ensure these are connected and properly used. Use of dust collection can reduce dust-
related hazards.
• Do not let familiarity gained from frequent use of tools allow you to become
complacent and ignore tool safety principles. A careless action can cause severe injury
within a fraction of a second.
SAFETY GUIDELINES

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POWER TOOL USE AND CARE
• Do not force the power tool. Use the correct power tool for your application. The correct
power tool will do the job better and safer at the rate for which it was designed.
• Do not use the power tool if the switch does not turn it on and off. Any power tool that
cannot be controlled with the switch is dangerous and must be repaired.
• Disconnect the plug from the power source and/or remove the battery pack,
if detachable, from the power tool before making any adjustments, changing
accessories, or storing power tools. Such preventive safety measures reduce the risk of
starting the power tool accidentally.
• Store idle power tools out of the reach of children and do not allow persons unfamiliar
with the power tool or these instructions to operate the power tool. Power tools are
dangerous in the hands of untrained users.
• Maintain power tools and accessories. Check for misalignment or binding of moving
parts, breakage of parts and any other condition that may affect the power tool’s
operation. If damaged, have the power tool repaired before use. Many accidents are
caused by poorly maintained power tools.
• Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting
edges are less likely to bind and are easier to control.
• Use the power tool, accessories and tool bits etc., in accordance with these instructions,
taking into account the working conditions and the work to be performed. Use of the
power tool for operations different from those intended could result in a hazardous situation.
• Keep handles and grasping surfaces dry, clean and free from oil and grease. Slippery
handles and grasping surfaces do not allow for safe handling and control of the tool in
unexpected situations.
BATTERY TOOL USE AND CARE
• Recharge only with the charger specified by the manufacturer. A charger that is suitable
for one type of battery pack may create a risk of fire when used with another battery pack.
• Use power tools only with specifically designated battery packs. Use of any other battery
packs may create a risk of injury and fire.
• When battery pack is not in use, keep it away from other metal objects, like paper
clips, coins, keys, nails, screws or other small metal objects, that can make a
connection from one terminal to another. Shorting the battery terminals together may cause
burns or a fire.
• Under abusive conditions, liquid may be ejected from the battery; avoid contact. If
contact accidentally occurs, flush with water. If liquid contacts eyes, additionally seek
medical help. Liquid ejected from the battery may cause irritation or burns.
• Do not use a battery pack or tool that is damaged or modified. Damaged or modified
batteries may exhibit unpredictable behaviour resulting in fire, explosion or risk of injury.
• Do not expose a battery pack or tool to fire or excessive temperature. Exposure to fire or
temperature above 130°C (265°F) may cause explosion.
SAFETY GUIDELINES

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• Follow all charging instructions and do not charge the battery pack or tool outside the
temperature range specified in the instructions. Charging improperly or at temperatures
outside the specified range may damage the battery and increase the risk of fire.
SERVICE
• Have your power tool serviced by a qualified repair person using only identical
replacement parts. This will ensure that the safety of the power tool is maintained.
• Never service damaged battery packs. Service of battery packs should only be performed by
the manufacturer or authorized service providers.
IMPACT WRENCH SAFETY WARNINGS
SAFETY INSTRUCTIONS FOR ALL OPERATIONS
• Hold the power tool by insulated gripping surfaces when performing an operation where
the fastener may contact hidden wiring or its own cord. Fasteners contacting a “live” wire may
make exposed metal parts of the power tool “live” and could give the operator an electric shock.
ADDITIONAL SAFETY GUIDELINES FOR CORDLESS IMPACT WRENCH
• The label on your tool may include the following symbols. The symbols and their
definitions are as follows:
V ..................... Volts
A ..................... Amperes
Hz ................... Hertz
W .................... Watts
min ................. Minutes
................. Alternating current
or d.c ..... Direct current
n0 ................... No-load speed
............... Class II Construction
…/min ........... Revolutions or reciprocation per minute
............... Grounding terminal
BPM ............... Beats per minute
RPM ............... Revolutions per minute
.............. WARNING – To reduce the risk of injury, user must read instruction manual.
.............. WARNING – To reduce the risk of injury always wear eye protection.
.............. WARNING – To reduce the risk of injury always wear ear protection.
SAFETY GUIDELINES

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• Secure the workpiece. A workpiece clamped with clamping devices or in a vice is held more
securely than it is by hand.
• Always wait until the power tool has come to a complete stop before placing it down.
The tool insert can jam and lead to loss of control over the power tool.
• Check the socket carefully for wear, cracks or damage before installation on the
impact wrench.
• Always be sure that you have a firm footing. Be sure that no one is below you when using
the tool in high locations.
• Check the torque with a torque wrench. The proper fastening torque may differ depending
on the type of size of the bolt.
• Use thick, cushioned gloves and limit the exposure time by taking frequent rest
periods. Vibration caused by impact wrench action may be harmful to your hands and arms.
• Do not use this tool as a drill. Tools equipped with shut-off clutches are not designed for
drilling applications. The output drive can shut off automatically and without warning.
• Be careful when driving long screws. There is a risk of the tool sliding off the fastener
head, depending on type of socket or bit used. First test the fastening time of a fastener and pay
attention during the screw-driving process to ensure you do not injure yourself if the tool bit or
socket slides off the fastener.
• Bits, sockets, and tools get hot during operation. Wear gloves when touching them.
• Wear ear protection. Exposure to noise can cause hearing loss.
• To reduce the risk of electric shock or damage to the charger and battery, use only the
Mastercraft®batteries and chargers listed.
BATTERY PACK CHARGER
054-3124-0, 054-7553-4, 054-7557-6, 054-2434-8 054-3126-6, 054-7559-2
• For best results, your battery tool should be stored and used in a location where the
temperature is more than 5°C (41°F) but less than 40°C (104°F). Do not store outside or
in vehicles.
SAFETY GUIDELINES

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PACKAGE CONTENTS:
Cordless impact wrench, belt clip, and instruction manual.
KEY PARTS DIAGRAM
1
2
3
4
5
No. Description No. Description
1 LED worklight 4 LED-worklight switch
2 1/2” (13 mm) square drive 5 Direction-of-rotation selector
3 Variable-speed trigger switch
Before attempting to use this tool, become familiar with all of its operating features and safety
requirements. For optimum performance and safety, read the following operating instructions carefully
before using.
KEY PARTS DIAGRAM
WARNING!
• Remove the cordless impact wrench from the package and examine it carefully. Do not discard the carton or any packaging
material until all parts have been examined.
• Do not allow familiarity with the cordless impact wrench to cause a lack of alertness. A fraction of a second of carelessness is
enough to cause severe injury.
FPO

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OPERATING INSTRUCTIONS
TO ATTACH BATTERY PACK (fig 1)
1. Lock the variable-speed trigger switch on the
impact wrench by placing the direction-of-rotation
selector (forward/centre-lock/reverse) in the centre
position.
2. Align the raised rib on the battery pack with the
grooves on the impact wrench, and then attach the
battery pack to the impact wrench.
3. Make sure that the latch on the battery pack snaps
into place and that the battery pack is attached
securely to the tool before beginning operation.
TO DETACH THE BATTERY PACK (fig 1)
1. Lock the variable-speed trigger switch on the impact wrench by placing the direction-of-rotation selector
(forward/centre-lock/reverse) in the centre position.
2. Depress the battery-release button, located on the front of the battery pack, to release the battery pack.
3. Pull the battery pack out and remove it from the tool.
OPERATING INSTRUCTIONS
NOTICE: When placing a battery pack on the tool, be sure that the raised rib on the battery pack aligns with the groove on
the cordless impact wrench and the latches snap into place properly. Improper assembly of the battery pack can cause damage to
internal components.
WARNING!
• To avoid the possibility of accidental starting, always take care not to activate the variable-speed trigger
switch when you are attaching the battery pack or performing other adjustments to the tool.
FPO
fig 1
Battery-
release
button
ATTACH
DETACH

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INSTALL THE BELT CLIP (fig 2)
1. Remove the battery from the tool.
2. Align the rib of the clip with the hole on the base of
the cordless impact wrench.
3. Insert the screw (included) and tighten the screw
securely with a screwdriver (not included). The belt
clip can be positioned on either side of the tool.
REMOVE THE BELT CLIP (fig 2)
1. Remove the battery from the tool.
2. Use a screwdriver (not included) to loosen the screw that attaches the belt clip to the cordless impact wrench.
3. Remove the screw and the belt clip.
DIRECTION-OF-ROTATION SELECTOR (fig 3)
The direction of rotation of the output shaft is
reversible and is controlled by a selector located
above the variable-speed trigger switch. With the
impact wrench held in the normal operating position:
Position the direction-of-rotation selector to the left
of the tool for forward rotation.
Position the direction-of-rotation selector to the right
of the tool for reverse rotation.
Position the direction-of-rotation selector in the centre to lock the tool off.
TRIGGER SWITCH (fig 4)
1. To turn the impact wrench ON, depress the variable-
speed trigger switch.
2. To turn it OFF, release the variable-speed trigger
switch.
VARIABLE SPEED (fig 4)
The variable-speed trigger switch delivers higher
speed with increased trigger pressure and lower
speed with decreased trigger pressure.
OPERATING INSTRUCTIONS
fig 2
Belt clip
Screw
NOTICE:
• To prevent gear damage, always allow the impact wrench to come to a complete stop before changing the direction of
rotation.
• The impact wrench will not run unless the direction-of-rotation selector is engaged fully to the left or right.
fig 4
Direction-
of-rotation
selector
Variable-
speed
trigger
switch
fig 3
Forward Reverse

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ELECTRIC BRAKE
To stop the impact wrench, release the variable-speed trigger switch and allow the tool to come to a
complete stop. The electric brake quickly stops the rotation. This feature engages automatically when
you release the variable-speed trigger switch.
LED WORKLIGHT (fig 5)
The LED worklight, located in the front of the
cordless impact wrench, will illuminate when the
variable-speed trigger switch is depressed and
will automatically turn off about 10 seconds after
the variable-speed trigger switch is released. This
provides increased visibility in dark places.
The LED worklight can also be separately controlled
with the LED-worklight switch. The LED worklight
will illuminate when the LED-worklight switch
is pressed and will turn off when it is pressed again. The LED worklight will illuminate for up to 20
minutes after turning on the LED-worklight switch.
INSTALLING AND REMOVING THE SOCKET
(fig 6)
Always use an impact socket of the correct size
for bolts and nuts. An incorrect socket will result in
inaccurate and inconsistent fastening torque and/or
damage to the bolt or nut.
1. Lock the variable-speed trigger switch by placing
the direction-of-rotation selector in the OFF (centre)
position.
2. To install the socket, push it onto the output drive of
the tool until it locks into place.
3. To remove the socket, simply pull it off.
OPERATING INSTRUCTIONS
fig 6
fig 5
LED worklight
LED-worklight
switch

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INSTALLING FASTENERS
To fasten
1. Start threading the fastener by hand onto or into its threaded counterpart (e.g., nut onto bolt, or bolt into
nut or threaded hole).
2. With the proper impact socket securely mounted to the impact wrench, slide the impact socket onto the
nut or bolt head.
3. Place the direction-of-rotation selector in the FORWARD position, firmly hold the tool, and depress the
variable-speed trigger switch. The impact socket will turn the fastener and impacting will begin when the
fastener encounters resistance.
To loosen
1. With the proper impact socket securely mounted to the wrench, slide the impact socket onto the bolt
head.
2. Place the direction-of-rotation selector in the REVERSE position, firmly hold the tool, and depress the
variable-speed trigger switch. The tool will start to impact immediately.
3. Once the fastener has “broken loose,” it will start to unthread. Be careful that you do not allow a fastener
to spin freely once it is no longer engaged with its threaded counterpart, as it may be thrown out of the
socket.
OPERATING INSTRUCTIONS
WARNING!
• Do not over-tighten, as the force of the impact wrench can break the fastener.
• When loosening a fastener, careful that you do not allow the fastener to spin freely once it is no longer engaged with its
threaded counterpart, as it may be thrown out of the socket.
FPO
NOTICE: Always keep the impact wrench at a right angle to the fastener to avoid damaging the fastener head.

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IMPACTING TIPS
The proper fastening torque may differ depending on the type or size of the bolt, the material of the
workpiece to be fastened, etc.
Practice with various fasteners, noting the length of time required to reach the desired torque. Check
the tightness with a hand-torque wrench. If the fasteners are too tight, reduce the impacting time. If
they are not tight enough, increase the impacting time.
Hold the tool firmly and place the socket over the bolt or nut. Turn the tool on and fasten the bolt or nut
to the proper torque.
The torque that is required to loosen a fastener averages 75% to 80% of the tightening torque,
depending on the condition of the contacting surfaces. If rust or corrosion causes seizing, more torque
may be required.
After fastening, always check the torque with a torque wrench. The fastening torque is affected by a
wide variety of factors, including the following:
• Voltage: A voltage reduction due to a nearly discharged battery will cause a reduction in the
fastening torque.
• Socket: Failure to use the correct size of socket will cause a reduction in the fastening torque. A
worn socket (wear on the hex end or square end) will cause a reduction in the fastening torque.
• Bolt: Although the torque coefficient and the class of bolt may be the same, the proper fastening
torque will differ according to the diameter of the bolt. Even if the diameters of bolts are the
same, the proper fastening torque will differ according to the torque coefficient, the class of bolt
and the bolt length.
• The use of a universal joint or an extension bar (both available separately) will reduce the
fastening force of the impact wrench somewhat. Compensate by fastening for a longer period of
time.
• The manner of holding the tool or the material to be fastened will affect the torque.
OPERATING INSTRUCTIONS
NOTICE:
• Hold the tool straight and along the axis of the bolt or nut.
• Excessive fastening torque may damage the bolt/nut or socket. Before starting your job, always perform a test operation to
determine the proper fastening time for your bolt or nut.

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MAINTENANCE
BEFORE EACH USE
1. Inspect the impact wrench, the variable-speed trigger switch, the battery pack and the accessories for
damage.
2. Check for damaged, missing, or worn parts.
3. Check for loose screws, misalignment or binding of moving parts, or any other condition that may affect
the operation.
4. If abnormal vibration or noise occurs, turn the tool off immediately and have the problem corrected before
further use.
CLEANING
Remove the battery pack from the tool before cleaning or performing any maintenance. Using
compressed air may be the most effective cleaning method. Always wear safety goggles when cleaning
tools using compressed air.
•
MAINTENANCE
WARNING!
• Do not let brake fluids, gasoline, petroleum-based products, penetrating oil, etc., come into contact with plastic parts. These
substances contain chemicals that can damage, weaken, or destroy plastic.
• When servicing, use only identical replacement parts. The use of any other parts may create a hazard or cause damage to
the product.
• Use only accessories that are recommended for this impact wrench by the manufacturer. Accessories that may be suitable for
one tool may become hazardous when used with another tool.
• To ensure safety and reliability, all repairs should be performed by a qualified service technician.
FPO

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TROUBLESHOOTING
Problem Possible Causes Solution
Socket cannot be installed. Improper socket selection. Use a suitable socket.
The motor is overheating.
Be sure that the cooling vents
are free of dust and obstacles.
Clean and clear vents. Do not
cover them with your hand
during operation.
The impact wrench does not
work.
The battery is depleted. Charge the battery.
The tool is overheated. Allow the tool to cool down.
If the problem remains unsolved after performing the checks described above, call the toll-free helpline
at 1-800-689-9928.
•
TROUBLESHOOTING
WARNING!
• Turn the variable-speed trigger switch to the “OFF” (centre) position and remove the battery from the
power tool before performing troubleshooting procedures.
FPO

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EXPLODED VIEW
PARTS LIST

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No. Part No. Description No. Part No. Description
1 3127566000 Decorative Cover 14 3322542000 Left Housing Assembly
2 2830457000 Shadowless Lamp
Assembly 15 3129854000 Logo
3 5610284000 Tapping Screw 16 3121038000 Rubber Stick
4 5660274000 C Ring 17 5630231000 Nut
5 2826179000 Front Gear Housing
Assembly 18 3705301000 Hook
6 5650501000 Washer 19 5620040000 Screw
7 2823552000 Output Shaft Assembly 20 5610225000 Hexagon Lobuar Screw
8 2824399000 Impact Block Assembly 21 3402897000 Contact Receptacle
Assembly
9 2825221000 Rear Gear Housing
Assembly 22 2830439000 Electric Assembly
10 2825298000 Rotor Assembly 23 3129915000 Button
11 2740431000 Stator 24 4870581000 Switch Assembly
12 5610005000 Tapping Screw 25 3127732000 F/R Button
13 3322543000 Right Housing Assembly
If any parts are missing or damaged, or if you have any questions, please call the toll-free helpline at
1-800-689-9928.
PARTS LIST

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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 components:
a) Component A: Batteries, chargers and carrying case, which are guaranteed for a period of 2 years from
the date of original retail purchase against defects in workmanship and materials;
b) Component B: 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 labour relating thereto.
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 owner’s 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 that 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);
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;
WARRANTY