MasterCraft 054-7121-2 User manual
INSTRUCTION MANUAL
20V max* LITHIUM-ION
CORDLESS ANGLE GRINDER
054-7121-2
20V max* LITHIUM-ION CORDLESS ANGLE GRINDER- 054-7121-2
2
20V max* LITHIUM-ION CORDLESS ANGLE GRINDER- 054-7121-2
TABLE OF CONTENTS
TECHNICAL SPECIFICATIONS 3
SAFETY GUIDELINES 4–10
DESCRIPTION 11
OPERATING INSTRUCTIONS 12–17
MAINTENANCE 18–19
TROUBLESHOOTING 20
PARTS LIST 21–22
WARRANTY 23–24
If any parts are
missing or damaged,
or if you have any
questions, please call
our toll-free helpline
at 1-800-689-9928.
Read and understand this instruction manual
thoroughly before using the product. It contains
important information for your safety as well as
operating and maintenance advice.
Keep this instruction manual for future use. Should
this product be passed on to a third party, then this
instruction manual must be included.
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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 Angle
Grinder before using. Keep this 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 and instructions. Failure to follow the warnings and instructions
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.
SAFETY GUIDELINES
MOTOR 20V DC
RATED SPEED 8000 RPM
WHEEL DIAMETER 4 1/2" (115 mm)
ARBOR SIZE 5/8"
RECOMMENDED WHEEL Type 27
TOOL WEIGHT 3 lb (1.37 kg)
BATTERY TYPE Lithium-ion
BATTERY VOLTAGE 20V max* DC
CHARGE INPUT 120V, 60 Hz AC only
OPTIMUM CHARGING TEMPERATURE 0–40°C (32–104°F)
*Maximum battery voltage without workload; with workload nominal voltage is 18V.
TECHNICAL SPECIFICATIONS
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A wrench or a key
left attached to a rotating part of the power tool may result in personal injury.
This enables better control of
the power tool in unexpected situations.
Loose clothes, jewellery or long hair can be caught in moving parts.
Use of these devices can reduce dust-
related hazards.
Power tool use and care
The correct
power tool will do the job better and more safely at the rate for which it was designed.
Any power tool that
cannot be controlled with the switch is dangerous and must be repaired.
Such
preventive safety measures reduce the risk of starting the power tool accidentally.
Power tools are
dangerous in the hands of untrained users.
Many accidents are caused by poorly maintained power tools.
Properly maintained cutting tools with sharp cutting edges
are less likely to bind and are easier to control.
Use of the power
tool for operations different from those intended could result in a hazardous situation.
SAFETY GUIDELINES
Work area safety
Cluttered or dark areas invite accidents.
Power tools create sparks, which may ignite the dust or fumes.
Distractions can cause
you to lose control.
Electrical safety
Unmodified plugs and matching
outlets will reduce risk of electric shock.
There is an increased risk of electric shock if your body is earthed or grounded.
Water entering a power tool will increase
the risk of electric shock.
Damaged or entangled
cords increase the risk of electric shock.
Use of a cord suitable for outdoor use reduces the risk of electric shock.
Use of a GFCI reduces the risk of electric shock.
Personal safety
A moment of inattention while operating power tools may result in serious personal injury.
Protective equipment such as
dust mask, non-skid safety shoes, hard hat, or hearing protection used for appropriate conditions will
reduce personal injuries.
Carrying power tools with
your finger on the switch or energising power tools that have the switch on invites accidents.
SAFETY GUIDELINES
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Incorrectly sized accessories cannot be adequately guarded or
controlled.
Accessories with arbor holes that do not match the mounting hardware of the
power tool will run out of balance, vibrate excessively and may cause loss of control.
Damaged accessories will
normally break apart during this test time.
The dust mask or respirator must be capable of filtrating particles generated by your operation.
Prolonged exposure to high intensity noise may cause hearing loss.
Fragments of workpiece or of a broken accessory
may fly away and cause injury beyond the immediate area of operation.
A
cutting accessory contacting a “live” wire may make exposed metal parts of the powertool "live" and
could give the operator an electric shock.
The
spinning accessory may grab the surface and pull the power tool out of your control.
Accidental contact with the spinning
accessory could snag your clothing, pulling the accessory into your body.
The motor’s fan will draw the dust inside the housing
and excessive accumulation of powdered metal may cause electrical hazards.
Sparks could ignite these materials.
Using water or other liquid coolants may
result in electrocution or shock.
SAFETY GUIDELINES
Battery tool use and care
A charger that is suitable for
one type of battery pack may create a risk of fire when used with another battery pack.
Use of any other battery
packs may create a risk of injury and fire.
Shorting the battery terminals together may cause burns or a fire.
Liquid ejected from the battery may cause irritation or burns.
Service
This will ensure that the safety of the power tool is maintained
Safety guidelines for angle grinder
Failure to follow
all instructions listed below may result in electric shock, fire and/or serious injury.
Operations for which the power tool was not designed
may create a hazard and cause personal injury.
Just because the accessory can be attached to your power tool, safe operation is
not assured.
Accessories running faster than their RATED SPEED can break and fly apart.
SAFETY GUIDELINES
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910
Wheels for which the power tool was not designed cannot be
adequately guarded and are unsafe.
The guard helps to
protect the operator from broken wheel fragments, accidental contact with wheel and sparks that
could ignite clothing.
Abrasive cut-off wheels are intended for peripheral grinding, side forces
applied to these wheels may cause them to shatter.
Proper wheel flanges support the wheel, thus reducing the possibility of wheel
breakage. Flanges for cut-off wheels may be different from grinding wheel flanges.
A wheel intended for larger power tool
is not suitable for the higher speed of a smaller tool and may burst.
Contents:
Cordless angle grinder, side handle, wrench, 4 1/2" grinding wheel and instruction manual.
WARNING!
Remove the cordless angle grinder from the package and examine it carefully. Do not
discard the carton or any packaging material until all parts have been examined.
V ..................... Volts
A ..................... Amperes
Hz ................... Hertz
W .................... Watts
min ................. Minutes
............... Alternating current
............. Direct current
n0 ................... No-load speed
............... Class II Construction
…/min ........... Revolutions per minute
............... Grounding terminal
BPM ............... Beats per minute
.............. WARNING – To reduce the risk of injury, user must read instruction manual.
Further safety instructions for operation
The operator can control torque reactions or
kickback forces, if proper precautions are taken.
The accessory may kickback over your hand.
Kickback will propel the tool in the direction opposite to the wheel’s movement at the point of snagging.
Corners, sharp edges or bouncing have a tendency to snag the rotating accessory
and cause loss of control or kickback.
Such blades create
frequent kickback and loss of control.
SAFETY GUIDELINES
SAFETY GUIDELINES
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To attach the battery pack (fig 1)
WARNING!
To avoid the possibility of accidental
starting, always take care not to
activate the trigger switch when you are
attaching the battery pack or performing
other adjustments to the tool.
1. Make sure that the angle grinder is turned off.
2. Align the raised rib on the battery pack with the grooves on the bottom of the tool, and then attach
the battery pack to the angle grinder.
When attaching the battery pack to the tool, make sure that the raised platform on the
pack aligns with the grooves on the bottom of the tool and that the latches snap properly into place.
Improper assembly of the battery pack can cause damage to internal components.
To detach battery pack (fig 1)
1. Make sure that the angle grinder is turned off.
2. Depress the battery-release button located on the front of the battery pack to release the battery
pack.
3. Pull the battery pack forward to remove it from the tool.
Know your tool
1
2
3
4
5
6
7
9
8
1 Switch button 6 Grinding wheel
2 Spindle-lock button 7 Outer flange
3 Spindle 8 Guard-adjusting lever
4 Side handle 9 Wheel guard
5 Inner flange
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.
WARNING!
Do not allow familiarity with the angle grinder to cause a lack of alertness. A fraction of a
second of carelessness is enough to cause severe injury.
OPERATING INSTRUCTIONS
DESCRIPTION
fig 1
Attach
Detach
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Installing the side handle (fig 3)
The side handle is used to guide and balance the
tool and can be threaded into the front housing
on either side of the tool, depending on personal
preference and comfort. Use the side handle for
safe control and ease of operation.
WARNING!
Failure to remove the battery pack
from the cordless angle grinder
when assembling parts, making adjustments, or changing application tools could result in
accidental starting and cause serious injury.
1. Remove the battery pack from the angle grinder.
2. The side handle may be installed on the right side or the left side of the tool. Thread the side handle
into the desired operating position.
3. Securely tighten the side handle by turning it clockwise.
ON/OFF switch (fig 2)
WARNING!
Firmly grasp the body of the tool and
the side handle before starting.
The tool is switched “ON” with the switch button
located at the top of the motor housing. The switch
can be locked in the “ON” position, a convenience
for long grinding operations. The symbol “O” on
the motor housing indicates OFF; the symbol “l” indicates ON.
1. To turn the tool ON without locking it, slide the switch button forward by applying pressure only at
the rear portion of the button.
2. To unlock the switch and turn the tool OFF, press and release the rear portion of the switch button; it
will return to the OFF position automatically.
For continuous operation:
1. Push the switch button forward to the ON position and press the front of the button down until the
switch clicks into position.
2. To unlock the switch and turn the tool OFF, press the rear of the button.
OPERATING INSTRUCTIONS
fig 3
OPERATING INSTRUCTIONS
fig 2 Switch button
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Mounting the wheel (fig 5-6)
WARNING!
Only use grinding wheels for which the maximum safe operating speed is rated at or
above 13200 RPM. Never use damaged or imbalanced grinding wheels. Do not exceed the
recommended wheel diameter. Grinding wheel type 27 is recommended for use on this
grinder.
WARNING!
Failure to remove the battery pack from the cordless angle grinder when assembling parts,
making adjustments, or changing application tools could result in accidental starting and
cause serious injury.
1. Remove the battery pack from the angle grinder.
2. Make sure that the guard is securely in place.
Depress the spindle-lock button. Loosen the
outer flange with the supplied wrench while
holding the spindle lock button down (fig 6).
3. Place the inner flange on the spindle; make sure
that the flange is positioned so that the shape of
the opening in the flange corresponds with the
shape at the base of the spindle.
4. Place the grinding wheel on the spindle. Check
the rated speed on the grinding wheel. DO NOT
use a wheel with a rated speed lower than the
speed shown on the grinder nameplate.
5. Thread the outer flange on the spindle with the
flat side of the flange facing up, making sure that
the opening in the wheel is positioned around the
raised portion of the outer flange (fig 5).
6. Press the spindle-lock button to prevent
movement of the spindle.
7. Keep the spindle-lock button depressed; tighten
the threaded outer flange by turning it clockwise with the wrench (fig 6).
WARNING!
Keep the guard between you and the wheel. Do not direct the guard opening toward your
body.
Adjust the guard (fig 4)
WARNING!
Failure to remove the battery pack
from the cordless angle grinder
when assembling parts, making
adjustments, or changing application
tools could result in accidental starting
and cause serious injury.
1. Remove the battery pack from the angle grinder
2. Press the guard-adjusting lever, and hold it to loosen the guard.
3. Rotate the guard to the desired position and make sure the lever lines up with notches on the guard.
4. Release the guard-adjusting lever to lock the guard;verify that the lever secures the guard.
WARNING!
Never use your grinder with the guard removed. It has been designed for use only with the
guard attached. Attempting to use the grinder with the guard removed will result in loose
particles being thrown against the operator and possibly serious personal injury.
WARNING!
Only use the guard with grinding wheels. Make sure that the guard-adjusting lever secures
the guard before operation. Keep the guard between you and wheel. Do not direct the guard
opening towards your body.
OPERATING INSTRUCTIONS
OPERATING INSTRUCTIONS
fig 4
Notch on the guard Guard-adjusting lever
fig 5
Outer flange
Inner flange
Spindle
Grinding wheel
fig 6
Spindle
lock button
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General maintenance
Before each use:
1. Inspect the angle grinder, the ON/OFF switch 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. Unplug the tool from power source before cleaning or performing any
maintenance.
WARNING!
Do not allow 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.
WARNING!
When servicing, use only identical replacement parts. The use of any other parts may
create a hazard or cause damage to the product.
WARNING!
Use only accessories that are recommended for this cordless angle grinder by the
manufacturer. Accessories that may be suitable for one tool may become hazardous when
used with another tool.
WARNING!
To ensure safety and reliability, all repairs should be performed by a qualified service
technician.
Lubrication
All of the bearings in this product are lubricated with a sufficient amount of high grade lubricant for the
life of the unit under normal operating conditions. Therefore, no further lubrication is required.
MAINTENANCE
Grinding operation
WARNING!
Only use grinding wheels for which the maximum safe operating speed is rated at or
above 13200 RPM. Never use damaged or imbalanced grinding wheels. Do not exceed the
recommended wheel diameter. Grinding wheel type 27 is recommended for use on this
grinder
WARNING!
Firmly grasp the body of the tool and the side handle before starting.
Grinding tips
• Use a clamp, vise or other practical means to hold your work, freeing both hands to control your tool.
Firmly grasp the body of tool and the side handle before starting and while the tool is in operation.
• Efficient grinding is achieved by controlling
the pressure and keeping the angle between
the wheel and the workpiece at 10° to 15°
(fig 7). If the wheel is flat, the tool is difficult to
control. If the angle is to steep, the pressure is
concentrated on a small area, causing burning
to the work surface.
• Move the angle grinder back and forth with
moderate pressure to avoid discoloring the
workpiece, overheating the workpiece and
creating ridges.
• Never use a cut-off wheel to grind a work piece.
• Always hold the tool properly so that sparks and grinding dust fly away from the body.
• Start the tool before applying the accessory to workpiece and let the tool come to full speed before
contacting the workpiece. Lift the tool from the workpiece before turning the tool OFF.
• When grinding with a new wheel, be certain to grind while pulling tool backwards until wheel
becomes rounded on its edge. New wheels have sharp corners which tend to “bite” or cut into
workpiece when pushing forward.
WARNING!
Sparks are generated when grinding metal. Take care that no combustible material
presented in the area of flying sparks.
fig 7
10°~ 15°
OPERATING INSTRUCTIONS
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PROBLEM CAUSE OF THE PROBLEM SOLUTION
The motor stops running Battery is depleted Charge the battery pack
The angle grinder does
not work
The switch is locked in the “ON”
position when attaching the bat-
tery pack.
Turn off the angle grinder first
and re-start the tool.
The tool is running slowly. The grinding wheel is worn out. Replace the grinding wheel on
the tool.
Cleaning
WARNING!
To avoid accidents always remove the battery pack from the cordless angle grinder before
cleaning or performing any maintenance. The tool maybe cleaned most effectively with
compressed dry air. Always wear safety goggles when cleaning tools with compressed air.
Ventilation openings and switch buttons must be kept clean and free of foreign matter. Do not attempt
to clean by inserting pointed objects through openings.
Storage and handling of grinding wheels
When not in use, grinding wheels should be stored carefully in a rack or box to protect them from
chipping or breakage. All grinding wheels must be handled carefully to prevent dropping and bumping.
TROUBLESHOOTING
MAINTENANCE
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Exploded view
1 3700567000 Wrench 24 5700048000 Ball Bearing
2 3550130000 Outer Flange 25 5660011000 Circlip For Shaft
3 3550328000 Inner Flange 26 3121601000 Rubber Ring
4 5610022000 Tapping Screw 27 3705129000 Bearing Retainer
5 3705251000 Plate 28 2750997000 Rotor
6 3705247000 Guard 29 5700250000 Ball Bearing
7 5620419000 Screw With Washer 30 3126290000 Fan Baffle
8 3550816000 Output Shaft 31 2740343000 Stator
9 5650044000 Plain Washer 32 2823622000 Brush Set
10 5620103000 Slotted Shoulder Screw 33 3124057000 Switch Button
11 3705248000 Lever 34 3321597000 Left Housing
12 3660345000 Spring 35 3127146000 Switch Actuator
13 3402647000 Gear Case Cover 36 3660057000 Spring
14 3552049000 Bevel Gear 37 3680158000 Magnet Ring
15 5700040000 Oil Impreging Bearing 38 4891008000 PCB Assembly
16 3551799000 Spindle Lock 39 3705547000 PCB Box
17 5690220000 O Ring 40 5620202000 Screw
18 5610034000 Tapping Screw 41 3704697000 Heat Sink
19 3120354000 Pin Knob 42 4870364000 Micro Switch
20 3660235000 Spring 43 3402577000 Contact Receptacle Assembly
21 3402299000 Handle 44 3321598000 Right Housing
22 3421509000 Gear Case 45 5610106000 Tapping Screw
23 3552048000 Pinion
PARTS LIST
PARTS LIST
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This Mastercraft product is guaranteed
against defects in materials and workmanship, 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 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);
WARRANTY
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;
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 discolouring by heat, abrasive and chemical
cleaners; and
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.
IMPORTED BY MASTERCRAFT CANADA TORONTO, CANADA M4S 2B8
WARRANTY
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