MasterCraft 5740.1 User manual

IMPORTANT:
Read and understand this instruction manual
thoroughly before using the product.
1/4” (6.4 MM)
BRUSHLESS IMPACT DRIVER
INSTRUCTION
MANUAL
054-7547-0

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TABLE OF CONTENTS
Technical Specifications 4
Safety Guidelines 5
Key Parts Diagram 10
Operating Instructions 11
Maintenance 17
Troubleshooting 18
Parts List 19
Warranty 21
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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4
TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
Rated Voltage 20 V d.c.
Max. Torque 2800 in-lb
No-load Speed 0–2800 RPM
Impact Rate 0–3300 BPM
Collet Capacity Hex 1/4" (6.4 mm)
*Maximum battery voltage without workload; with workload nominal voltage is 18V.
Recommend using tool with Mastercraft® 20V max* Lithium-Ion 4.0 Ah battery (054-7557-6; sold
separately) for optimal performance.

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SAFETY GUIDELINES
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
driver 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.

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SAFETY GUIDELINES
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.

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SAFETY GUIDELINES
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.

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SAFETY GUIDELINES
• 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.
• 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 DRIVER 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 DRIVER
• 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 ............... Revolutions per minute
RPM ............... Beats per minute
.............. WARNING – To reduce the risk of injury, user must read instruction manual.

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SAFETY GUIDELINES
.............. WARNING – To reduce the risk of injury always wear eye protection.
.............. WARNING – To reduce the risk of injury always wear ear protection.
• Secure the workpiece. Clamping devices or a vise will hold the workpiece in place better than
the hand.
• Always wait until the tool has come to a complete stop before placing it down. The tool
insert can jam, which can lead to loss of control.
• Always set the rotational direction switch to centre position before performing
any kind of work on the machine (e.g., maintenance, tool change, etc.), and when
transporting and storing it. Unintentional activation of the On/Off switch may result in personal
injury.
• Wear ear protectors when using the impact driver. Exposure to noise can cause hearing
loss.
• Use protective gloves when removing the bit from the tool, or allow the clamp to cool
down first. The bit may be hot after prolonged use.
• Use protective gloves when operating the tool. Protective gloves can help to keep you from
being burnt and hurt.
• Keep your hands away from the motor housing vents. Hot gas comes from the vents during
operation.
• Release the trigger immediately when the screw is tightened to avoid breaking the
screw.
WARNING!
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.

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KEY PARTS DIAGRAM
WARNING!
• Remove the cordless impact driver from the package and examine it carefully. Do not discard the carton or
any packaging material until all parts have been examined.
• If any part of the impact driver is missing or damaged, do not attach the battery pack to the tool or use the
tool until the part has been repaired or replaced. Failure to heed this warning could result in serious injury.
• Do not let familiarity with the cordless impact driver to cause a lack of alertness. A fraction of a second of
carelessness is enough to cause severe injury.
FPO
PACKAGE CONTENTS:
Cordless impact driver, 1 belt clip, 1 bit holder, 2 single-ended screwdriver bits, and instruction manual.
KEY PARTS DIAGRAM
1
2
3
5
4
No. Description No. Description
1 LED worklight 4 Direction-of-rotation selector
2 Sleeve 5 LED-worklight switch
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.

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WARNING!
• To avoid the possibility of accidental starting, always take care to lock the variable-speed trigger switch by
placing the direction-of-rotation selector in the centre (locked) position when you are attaching the battery
pack or performing other adjustments to the tool.
FPO
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 driver and the latches snap into place properly. Improper assembly of the battery pack can cause damage to
internal components.
OPERATING INSTRUCTIONS
TO ATTACH BATTERY PACK (fig 1)
1. Lock the variable-speed trigger switch on the
impact driver 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 of the impact driver, and then attach the
battery pack to the impact driver.
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 driver 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.
fig 1
Battery-release
button
ATTACH
DETACH

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OPERATING INSTRUCTIONS
INSTALL THE BIT HOLDER (fig 2)
1. Remove the battery from the tool.
2. Align the rib of the bit holder with the hole on the
base of the cordless impact driver.
3. Insert the screw (included) and tighten the screw
securely with a screwdriver (not included). The
bit holder can be positioned on either side of the
tool.
REMOVE THE BIT HOLDER (fig 2)
1. Remove the battery from the tool.
2. Use a screwdriver (not included) to loosen the screw that attaches the bit holder to the cordless
impact driver.
3. Remove the screw and the bit holder.
INSTALL THE BELT CLIP (fig 3 )
1. Remove the battery from the tool.
2. Align the rib of the clip with the hole on the base
of the cordless impact driver.
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 3)
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 driver.
3. Remove the screw and the belt clip.
fig 3
Screw
Belt clip
fig 2
Screw
Bit holder

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OPERATING INSTRUCTIONS
NOTICE:
• To prevent gear damage, always allow the impact driver to come to a complete stop before changing the direction of
rotation.
• The impact driver will not run unless the direction-of-rotation selector is engaged fully to the left or to the right.
TRIGGER SWITCH (fig 4)
1. To turn the impact driver 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.
DIRECTION-OF-ROTATION
SELECTOR (fig 5)
The direction of rotation of the bit is reversible and is
controlled by a selector located above the variable-
speed trigger switch. With the impact driver held in
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.
ELECTRIC BRAKE
To stop the impact driver, 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.
fig 4
Direction-of-
rotation selector
Variable-speed
trigger switch
fig 5
Forward Reverse

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LED WORKLIGHT (fig 6)
The LED worklight, located in the front of the
cordless impact driver, 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
by 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 A DRIVER BIT OR SOCKET
BIT (fig 7)
1. Lock the variable-speed trigger switch by placing
the direction-of-rotation selector in the OFF (centre)
position.
2. With one hand, pull the sleeve toward the front of
the tool and hold it in place.
3. With the other hand, insert a 1/4” (6.4 mm) bit
into the hex chuck in the bit retainer.
4. Release the sleeve and verify that it returns to its
original position.
REMOVING A DRIVER BIT OR SOCKET BIT (fig 7)
1. Lock the variable-speed trigger switch by placing the direction-of-rotation selector in the OFF
(centre) position.
2. Pull the sleeve toward the front of the tool and hold it in place.
3. Remove the bit from the hex chuck in the bit retainer.
4. Release the sleeve.
OPERATING INSTRUCTIONS
fig 6
WARNING!
• If the sleeve does not return to its original position, the bit is not correctly installed. Retry until the bit is
properly installed.
• Only use sockets designed for impact drivers. Sockets not designed for impact drivers could break and result
in user injury. Inspect sockets prior to use to ensure that they have no cracks or other visible damage.
• Use protective gloves when removing the bit from the tool or allow the bit to cool down first. The bit may be
hot after prolonged use.
FPO
fig 7
Sleeve
Hex chuck
LED worklight
LED-worklight switch

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OPERATING INSTRUCTIONS
TIGHTENING SCREWS OR
NUTS (fig 8/fig 9)
1. Install the correct bit/socket.
2. Position the direction-of-rotation selector to the
left of the tool for forward rotation.
3. Apply just enough pressure to keep the bit/
socket engaged on the screw or nut.
4. Apply minimal pressure to the variable-speed
trigger switch initially. Increase the speed only
when full control can be maintained.
LOOSENING SCREWS AND
NUTS (fig 8/fig 9)
1. Install the correct bit/socket.
2. Position the direction-of-rotation selector to the
right of the tool for reverse rotation.
3. Apply just enough pressure to keep the bit/
socket engaged on the screw or nut.
4. Apply minimal pressure to the variable-speed
trigger switch initially. Increase the speed only when full control can be maintained.
fig 8
fig 9

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OPERATING INSTRUCTIONS
TIGHTENING TORQUE
The fastening torque is affected by a wide variety of factors, including the those listed below. After
fastening, always check the torque with a torque wrench.
Voltage: Low voltage, due to a nearly discharged battery, will reduce fastening torque.
Socket size: Failure to use the correct socket size will cause a reduction in fastening torque.
Bolt size: Larger bolt diameters generally require higher fastening torque. Fastening torque will also
vary according to length, grade, and torque coefficient.
Bolt: Ensure that all threads are free of rust and other debris to allow proper fastening torque.
Material: The type of material and surface finish of the material will affect fastening torque.
NOTICE: Before starting your job, always perform a test operation to determine the proper fastening time.
WARNING!
• Do not over-tighten, because the force of the impact driver can break the fastener. Keep the impact driver
pointed straight at the fastener to avoid damaging the fastener head.
FPO

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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 cordless impact driver 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
MAINTENANCE
BEFORE EACH USE:
1. Inspect the cordless impact driver, the variable-speed trigger switch, and the battery pack 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. Remove the battery from the power tool before cleaning or performing any
maintenance.
CLEANING
Using compressed air may be the most effective cleaning method. Always wear safety goggles when
cleaning tools using compressed air.

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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
TROUBLESHOOTING
Problem Possible Causes Solution
The bit cannot be installed.
The sleeve is not released. Release the sleeve.
The bit does not fit the
sleeve.Use a suitable bit.
The motor overheats.
Be sure the cooling vents
are free of dust and
obstacles.
Clean and clear vents. Do not cover with
hand during operation.
The impact driver 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.

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PARTS LIST
EXPLODED VIEW

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PARTS LIST
No. Part No. Description No. Part No. Description
1 3127567000 LED Cover 18 3520984000 Ring Gear
2 3130018000 Decorative Cover 19 5700181000 Bearing
3 5660035000 Circlips For Shaft 20 5690271000 Rubber Ring
4 5650192000 Washer 21 5690357000 O Ring
5 3660177000 Spring 22 3129083000 Rear Gear Housing
6 3551835000 Bush 23 2740401000 Stator
7 5700178000 Steel Ball 24 2826357000 Rotor Assembly
8 5660274000 C Ring 25 3129915000 Button
9 5610284000 Tapping Screw 26 3127732000 F/R Button
10 2826340000 Front Gear Housing Assembly 27 5630231000 Nut
11 5650501000 Washer 28 2830485000 Electric Assembly
12 3900145000 L R Housing set 29 3129854000 Logo
13 5610225000 Hexagon Lobuar Screw 30 3121038000 Rubber Stick
14 3321321000 Bit Holder 31 3705301000 Hook
15 5620040000 Screw 32 3810426000 Screw Bit
16 3552639000 Output Shaft 33 3810429000 Screw Bit
17 2825806000 Impact Block 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.