MasterCraft SC20BST User manual

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model no. SC20BST
GRASS TRIMMER/
EDGER
IMPORTANT:
Read and understand this instruction manual thoroughly
before using the product.
INSTRUCTION
MANUAL

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TABLE OF CONTENTS
Technical Specifications 4
Safety Guidelines 5
Key Parts Diagram 10
Operating Instructions 11
Maintenance 19
Troubleshooting 20
Parts List 21
Warranty 23
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 when using this product.
TABLE OF CONTENTS

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TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
Rated Voltage 20 V d.c.
No-load Speed 7,700 RPM
Cutting-line Diameter 0.065” (1.65 mm)
Cutting Width 12” (30.5 cm)
*Maximum battery voltage without workload; with workload nominal voltage is 18 V.

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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 grass trimmer
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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• Avoid dangerous environments. Don’t use appliances in damp or wet locations.
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.
• Always use personal protective equipment. Personal protective equipment such as eye
protection, dust mask, non-skid safety shoes, hard hat and/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.
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.
SAFETY GUIDELINES

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• 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.
• Keep cables away from the working area of the tool. During operation cables may be
hidden from view and can be accidentally damaged by the tool.
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.
• 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.
• Do not modify or attempt to repair the appliance or the battery pack (as applicable)
except as indicated in the instructions for use and care.
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.
SAFETY GUIDELINES

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• Never service damaged battery packs. Service of battery packs should only be performed by
the manufacturer or authorized service providers.
ADDITIONAL SAFETY GUIDELINES
• The label on your tool may include the following symbols. The symbols and their
definitions are as follows:
V ...................... Volts
A ...................... Amperes
W ..................... Watts
min .................. Minutes
or d.c. .... Direct current
n0 ..................... No-load speed
RPM ................. Revolutions per minute
................. Class II construction
................. 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.
WARNING!
To reduce the risk of electric shock or damage to the charger and battery, use only the
Mastercraft®batteries and chargers listed.
BATTERY PACKS CHARGERS
054-3124-0, 054-7553-4, 054-7557-6 054-3126-6, 054-7559-2
• When replacing the cutting line, use no more than 0.065” (1.65 mm) nylon line; using
heavier lines than recommended by the manufacturer increases the load on the motor and
reduces its operating speed. This results in overheating and damage to the trimmer.
• To reduce the risk of serious injury, never use wire or metal-reinforced line or other
material in place of the nylon cutting lines. Pieces of wire could break off and be thrown at
high speed toward the operator or bystanders.
• Replace a cracked, damaged or worn-out cutting head immediately, even if damage is
limited to superficial cracks. Such attachments may shatter at high speed and cause serious
or fatal injury.
• For best results, your battery tool should be stored, charged 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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• If the power tool should start to vibrate abnormally or become noisy, stop the motor
and check immediately for the cause. Abnormal noise is generally a warning of trouble.
• Keep guards in place and in working order. Make sure all proper guards and other
safety devices are properly and securely attached before using this product. Do not
operate without guards in place.
• Use right appliance. Do not use appliance for any job except that for which it is intended.
• Do not charge the battery pack in rain, or in wet locations.
• Don’t use in rain.
• Keep hands and feet away from cutting area.
• Do not open or mutilate the battery. Released electrolyte is corrosive and may cause damage
to the eyes or skin. It may be toxic if swallowed.
• Battery tools do not have to be plugged into an electrical outlet; therefore, they are
always in operating condition. Be aware of possible hazards even when the tool is not
operating. Take care when performing maintenance or service.
• Do not wash with a hose; avoid getting water in motor and electrical connections.
• SAVE THESE INSTRUCTIONS. Refer to them frequently and use them to instruct others who may
use this tool. If you lend this tool to someone else, also lend these instructions to them to prevent
misuse of the product and possible injury.
SAVE THESE INSTRUCTIONS!
SAFETY GUIDELINES

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PACKAGE CONTENTS:
Cordless trimmer, safety guard, auxiliary handle, flower guard, edging wheel, 2 screws.
KEY PARTS DIAGRAM
31
4
6
9
8
5
2
11
10
7
12
No. Description No. Description
1 Lock-off button 7 Angle-adjustment button
2 On/off switch 8 Flower guard
3 Auxiliary handle 9 Edging wheel
4 Handle-unlock button 10 Safety guard
5 Upper shaft 11 Lower shaft
6 Upper shaft rotation collar 12 Height-adjustment collar
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 trimmer 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 trimmer 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 allow familiarity with the trimmer 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
INSTALL/REMOVE THE SAFETY GUARD
(fig 1)
1. Insert the ribs of the safety guard into the slots on
the trimmer head.
2. Align the holes on the safety guard with the holes
on the trimmer head, and then use the screws
(included) to lock the safety guard.
INSTALL/REMOVE THE FLOWER GUARD
(fig 2)
1. Widen the flower guard, and then insert ribs of the
flower guard into the holes on the trimmer head.
2. The flower guard can be adjusted to different
angles according to your operation.
3. Simply widen the flower guard to remove the
flower guard.
OPERATING INSTRUCTIONS
NOTICE: Before trimming or edging make sure the flower guard is locked firmly in position.
fig 1
Rib
Rib
Safety
guard
Trimmer
head
fig 2 Rib
Holes Flower
guard

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INSTALL THE EDGING WHEEL (fig 3)
1. Align two slots on the wheel with the metal plate
on the trimmer head, and then fully insert the
wheel onto the metal plate.
2. To remove the wheel, press and hold the button
on the wheel, and then pull out the wheel in the
“Detach” direction.
ADJUST THE AUXILIARY HANDLE (fig 4)
1. Press the handle-unlock button and the left button
together, slide the auxiliary handle onto the two
buttons and then release the buttons to lock the
handle.
2. Rotate the auxiliary handle to the most comfortable
and balanced position.
3. Then release the handle-unlock button. Raise or
lower the auxiliary handle to make sure it is fixed
firmly.
OPERATING INSTRUCTIONS
fig 3b Detach
Button
fig 3a
Slots
Metal
plate
Wheel
fig 4 Auxiliary handle
Handle-unlock
button
Left button
11
2

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ADJUST THE DIRECTION OF UPPER
SHAFT (fig 5)
1. Pull the upper shaft rotation collar backward and
hold on the knob.
2. Turn the upper shaft for 90° in a clockwise
direction and then release the knob to lock the
upper shaft.
ADJUST THE HEIGHT (fig 6)
1. Rotate the height-adjustment collar in the “Loose”
direction to unlock the lower shaft.
2. Adjust the length of the lower shaft to be most
comfortable for you.
3. Rotate the height-adjustment collar in the opposite
direction to lock the lower shaft.
ADJUST THE CUTTING ANGLE (fig 7)
Press the angle-adjustment knob, rotate the shaft,
align the arrow with the number from 1 to 4 on the
dial to choose from different cutting angles one that
is most suitable for you, and then release the button
to lock the cutting angle.
OPERATING INSTRUCTIONS
fig 7 Angle-
adjustment
knob
Lower shaft
Arrow
Dial
fig 5
Upper shaft
rotation collar
Upper shaft
1
2
fig 6 Height-
adjustment
collar
Lower shaft
Loose

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TO ATTACH BATTERY PACK (fig 8)
1. Make sure that the switch is in the OFF position.
2. Align the raised portion on the battery pack with
the grooves on the bottom of the tool, and then
slide the battery pack onto the tool as shown.
3. Ensure that the battery-release button on the
battery pack snaps into place and the battery pack
is secured to the tool before beginning operation.
TO DETACH THE BATTERY PACK (fig 8)
1. Ensure that the switch is in the OFF position.
2. Depress the battery-release button located on the front of the battery pack to release the battery pack.
3. Pull rearward on the battery pack to remove it from the tool.
•
fig 8
WARNING!
• To avoid the possibility of accidental starting, always take care not to activate the on/off switch when you are attaching the
battery pack or performing other adjustments to the tool.
FPO
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 trimmer and the latches snap into place properly. Improper assembly of the battery pack can cause damage to
internal components.
OPERATING INSTRUCTIONS
Battery-release
button

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TO START/STOP THE TRIMMER (fig 9)
1. To turn the trimmer on, press the lock-off button
and then depress the on/off switch.
2. To turn it off, release the on/off switch and allow
the trimmer to come to a complete stop.
TRIMMING
1. Do not cut wet grass because it tends to stick
to the trimmer head and guard, prevents proper
discharge of grass clippings, and could cause you
to slip and fall.
2. Regularly remove clippings and dirt around the trimmer head. Ensure the trimmer is switched off.
3. Hold rear handle with one hand and auxiliary handle with the other hand. Keep unit below waist level,
and stand firmly with your feet apart.
4. Do not move the trimmer too fast as this will result in ineffective cutting and possible damage.
5. Cut repeatedly from up and down in layers when the grass is very high. Keep the trimmer head at an
angle of about 30° to the ground when trimming. Avoid pressing it against the ground as this can ruin
the lawn and damage the trimmer head.
EDGING (fig 10)
1. Adjust the lower shaft to the place where the arrow
is aligned with 4 on the dial (refer to “ ADJUST THE
CUTTING ANGLE ”).
2. Turn the upper shaft 90° in a clockwise direction
and release the upper shaft rotation collar to lock
the shaft (refer to “
ADJUST THE DIRECTION OF
UPPER SHAFT ”).
3. Install the battery, hold the rear handle with one
hand and auxiliary handle with another hand, and
turn on the trimmer for edging.
WARNING!
• Always wear eye protection and heavy clothing.
• Without bending over, keep line near and parallel to the ground (perpendicular when edging).
• Make sure that the line is fed out before operation. Make sure the motor is up to full speed before trimming.
• Use only 0.065” (1.65 mm) diameter nylon cutting line.
FPO
OPERATING INSTRUCTIONS
fig 10
Wheel
Upper shaft
Upper shaft
rotation collar
fig 9 Lock-off button
On/off switch
NOTICE:
• Number 4 on the dial is the position only for storage and edging.
• Number 1 to 3 on the dial is the position for trimming. Choose the position number which is suitable for you and keep the
trimmer head at an angle of about 30° to the ground when trimming.

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AUTOMATIC LINE FEED SYSTEM (fig 11)
When initially switching on the trimmer, a small
length of line is fed out. Each time the tool is started
from rest it will advance same amount trimmer line.
If the noise of the line being cut can’t be heard,
more line will be fed out. To feed more line, it is first
necessary to allow the trimmer to stop completely,
and then restart, allowing the motor to reach full
speed. Repeat above until you hear the lines hitting
against the line cutter.
A “clattering” noise will be heard when the lines hit the line cutter. Do not be alarmed; this is quite
normal. After several seconds the line will be cut to the correct length and the noise will reduce as the
motor reaches full speed.
fig 11
NOTICE: Remove the protective film on the line cutter before operating the tool.
OPERATING INSTRUCTIONS
Line cutter
Feed
button

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MANUALLY FEED THE LINE (fig 12)
If required, line can be fed out manually. Before
manually feeding, remove the battery first. To
operate, press and release manual line feed button
(fig 11), while gently pulling out the lines until the
lines reach the line cutter.
If the line extends past the line cutter, too much line
has been fed out. If too much line is fed out:
1. Press two tabs on the spool cap, remove tabs from
the slots, and then remove the spool cap from the
spool base.
2. Turn the spool counter-clockwise until the line is at
the desired length.
3. Press two tabs, align tabs with slots, and then
press the spool cap onto the spool base.
OPERATING INSTRUCTIONS
fig 12a Spool cap
Spool base
Tab
Slot
fig 12b
Spool

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WIND THE SPOOL WITH NEW LINE
(fig 13)
1. Detach the spool cap and spool from the spool
base (refer to fig 12 ). Remove the old cutting line
from the spool.
2. Insert about 5/8” (15 mm) of line into the spool
hole (
fig 13a ) and wind line in the direction of the
arrows on the top of the spool ( fig 13b). Ensure
that the line is neatly coiled on the spool. Failure to
do so will impair the efficiency of the automatic line
feed.
3. Leave approximately 4” (10 cm) of line unwound
and place it through two notches on the spool
( fig 13c).
4. Release the cutting line from notches and insert
the line through the eyelet. Place the spool onto the
spool base ( fig 13d).
5. Press two tabs of the spool cap, align tabs with
slots of spool base, and then press the spool cap
onto the spool base ( fig 12a).
fig 13b
OPERATING INSTRUCTIONS
fig 13a Spool
hole
fig 13c
Notches
fig 13d
Spool cap
Spool
Spool
base Eyelet

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MAINTENANCE
CHECK FOR DAMAGED/WORN PARTS BEFORE EACH USE
Check the trimmer head, safety guard and auxiliary handle and replace any parts that are cracked,
warped, bent, or damaged in any way. The line cutter on the edge of the guard can dull over time. It is
recommended that you periodically sharpen it with a file or replace it with a new blade.
CLEAN THE TRIMMER AFTER EACH USE
1. Clear any grass that may have wrapped itself around the motor shaft or trimmer head.
2. Use only a clean, dry and soft cloth to clean the tool. Never let any liquid get inside the tool; never
immerse any part of the tool into a liquid.
3. Keep the air vents on the trimmer head free from debris at all times.
STORAGE
Clean the tool thoroughly before storing it. Store the unit in a dry, well-ventilated area, locked-up or
up high, out of the reach of children. Keep away from corrosive agents, such as garden chemicals and
de-icing salts.
WARNING!
• To avoid accidents, always remove the battery pack from the string trimmer before cleaning or performing
any maintenance.
• 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 trimmer 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

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TROUBLESHOOTING
Problem Possible causes Solutions
The trimmer doesn’t
work.
The battery is depleted. Charge the battery pack.
The battery pack is overloaded. Decrease the load on the trimmer.
The battery pack is too hot. Cool the battery pack and then restart
the tool again.
Trimmer head will not
advance line.
The motor shaft or trimmer head is
bound with grass.
Stop the trimmer, remove the battery,
and clean the motor shaft and trimmer
head.
Cutting line is not wound well. The line
is tangled.
Manually feed the line rst. If the line
still cannot feed out, rewind the line.
There is not enough line on the spool. Replace the cutting line. Follow the
section “WIND THE SPOOL WITH NEW
LINE” in this manual.
Excessive vibrations/
noise.
Line spool is not wound well. Rewind the line.
If the problem remains unsolved after performing the checks described above, call the toll-free helpline
at 1-800-689-9928.
TROUBLESHOOTING