GreenWorks Pro ST80L210 User manual

80V 16” Cordless String Trimmer
Read all safety rules and instructions carefully before operating this tool.
Owner’s Manual
TOLL-FREE HELPLINE: 1-855-345-3934
www.greenworkstools.com/80v-pro
ST80L210

2
CONTENTS
Contents .............................................................................................................................. 2
Product Specications ........................................................................................................ 2
Important Safety Instructions............................................................................................... 3
Symbols ............................................................................................................................... 5
Know Your String Trimmer ................................................................................................... 7
Assembly ............................................................................................................................. 9
Operation........................................................................................................................... 15
Battery & Charger Maintenance................................................ .......................................... 23
Maintenance........................................................................................................................... 25
Environmentally Safe Battery Disposal .................................................................................26
Troubleshooting..................................................................................................................27
Limited Warranty................................................................................................................29
Exploded View and Part List.................................. ..............................................................30
PRODUCT SPECIFICATIONS
80V 16" CORDLESS STRING TRIMMER
Type ............................................................................................. Cordless, battery powered
Motor .............................................................................................................. 80V Brushless
Cutting Width ...........................................................................14 in. /16 in. (35.6 cm / 40.6 cm)
Line Diameter ..................................................................................Nylon / 0.080" (2 mm)
Speed ...........................................................................................................6200 (±10%)RPM
Feed Type ...............................................................................................................Bump Feed
Weight (without battery) ...............................................................................7.1 lbs (3.2 kg)

3
IMPORTANT SAFETY INSTRUCTIONS
WARNING
Read and understand all instructions before using this product. Failure to follow all
instructions listed below may result in electric shock, re, and/or serious personal injury.
• Use only identical manufacturer’s replacement parts and accessories. Use of any other parts
may create a hazard or cause product damage.
• Always wear safety glasses with side shields marked to comply with ANSI Z87.1. Everyday
glasses have only impact resistant lenses. They are NOT safety glasses. Following this rule
will reduce the risk of eye injury. Use face mask if operating in dusty work spaces.
• Avoid Dangerous Environment — Don’t expose power tools to damp or wet conditions. Water
entering a power tool will increase the risk of electric shock.
• Don’t use in rain.
• Keep all bystanders, children, and pets at least 50 ft. away.
• Do not use the power tools for any job except that for which it is intended.
• Avoid Unintentional Starting – Do not carry string trimmer with ngers on the switch. Be sure
the battery is removed while transporting.
• Do not operate the equipment while barefoot or when wearing sandals or similar lightweight
footwear. Wear protective footwear that will protect your feet and improve your footing on
slippery surfaces.
• Don’t overreach - Keep proper footing and balance at all times.
• Stay alert - Watch what you are doing. Use common sense. Do not operate this unit when you
are tired, ill or under the inuence of alcohol, drugs or medication.
• Always store idle power tools indoors - When not in use, power tools should be stored indoors
in a dry place, out of reach of children.
• Power tool maintenance – Replace string head if cracked, chipped, or damaged in any
way. Be sure the string head is properly installed and securely fastened. Keep cutting edge
sharp and clean for best performance and to reduce the risk of injury. Follow instructions for
lubricating and changing accessories. Inspect appliance cord periodically, and if damaged,
have it repaired by an authorized service facility. Inspect extension cords periodically and
replace if damaged. Keep handles dry, clean, and free from oil and grease. Failure to do so
can cause serious injury.
• Check Damaged Parts – Before further use of the appliance, a guard or other part that is
damaged should be carefully checked to determine that it will operate properly and perform its
intended function. Check for alignment of moving parts, binding of moving parts, breakage of
parts, damaged mountings, and any other condition that may affect its operation. A guard or
other part that is damaged should be properly repaired or replaced by an authorized service
center unless indicated elsewhere in this manual.
• Do not charge or operate cordless tools in damp or wet locations or in the rain. Following this
rule will reduce the risk of electric shock.
• Remove or disconnect battery before servicing, cleaning or removing material from the
gardening appliance.

4
IMPORTANT SAFETY INSTRUCTIONS
• Do not dispose of the batteries in a re. The cells may explode. Check with local codes for
possible special disposal instructions.
• Do not open or mutilate the batteries. Released electrolyte is corrosive and may cause
damage to the eyes or skin. It may be toxic if swallowed.
• Exercise care in handling batteries in order not to short the battery with conducting materials
such as rings, bracelets, and keys. The battery or conductor may overheat and cause burns.
• Dress Properly – Do not wear loose clothing or jewelry. They can be caught in moving parts.
Use of rubber gloves and substantial footwear is recommended when working outdoors. Wear
protective hair covering to contain long hair.
• Do not add unnecessary force to your power tool – It will do the job better and with less
likelihood of a risk of injury at the rate for which it was designed.
• Recharge only with the charger specied by the manufacturer. A charger that is suitable for
one type of battery pack may create a risk of re when used with another battery pack.
• For use only with (2901302, 2902402) battery. For use only with (2901402, 2903702) charger.
• 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 a re.
• Under abusive conditions, liquid may be ejected from the battery; avoid contact. If contact
accidentally occurs, ush 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 appliance that is damaged or modied. Damaged or modied
batteries may exhibit unpredictable behavior resulting in re, explosion or risk of injury.
• Do not expose a battery pack or power tools to re or excessive temperature. Exposure to re
or temperature above 265°F (130°C) may cause explosion.
W A R N I N G (PROPOSITION 65)
Some dust created by power sanding, sawing, grinding, drilling, and other construction activities
contains chemicals known to cause cancer, birth defects or other reproductive harm. Some
examples of these chemicals are:
• Lead from lead-based paints
• Crystalline silica from bricks and cement and other masonry products, and
• Arsenic and chromium from chemically treated lumber.
Your risk of exposure to these chemicals varies depending on how often you do this type of
work. To reduce your exposure to these chemicals, work in a well-ventilated area, and work with
approved safety equipment, such as dust masks that are specially designed to lter out microscopic
particles.
SAVE THESE INSTRUCTIONS

5
Some of the following symbols may be used on this product. Please study them and learn their
meaning. Proper interpretation of these symbols will allow you to operate the product better and safer.
SYMBOL NAME DESIGNATION/EXPLANATION
V Volts Voltage
A Amperes Current
Hz Hertz Frequency (cycles per second)
W Watts Power
min Minutes Time
Alternating Current Type of current
Direct Current Type or a characteristic of current
No Blade Do not install or use any type of blade on a
product or displaying this symbol.
/min Per Minute Revolutions, strokes, surface speed, orbits
etc., per minute.
Wet Conditions Alert Do not expose to rain or use in damp locations.
Read The Operator’s Manual To reduce the risk of injury user must read and
understand operator’s manual before using
this product.
Eye Protection Always wear eye protection with side shields
marked to comply with ANSI Z87.1 when
operating this equipment.
Safety Alert Precautions that involve your safety.
Ricochet Thrown objects can ricochet and result in
personal injury or property damage.
Keep Bystanders Away Keep all bystanders at least 50 ft. away.
SYMBOLS

The following signal words and meanings are intended to explain the levels of risk associated
with this product.
SERVICE
Servicing requires extreme care and knowledge and should be performed only by a qualified
service technician. For service we suggest you return the product to your nearest AUTHORIZED
SERVICE CENTER for repair. Use only identical manufacturer’s replacement parts and
accessories.
WARNING
To avoid serious personal injury, do not attempt to use this product until you have read this Owner's
Manual thoroughly and understand it completely. If you do not understand the warnings and
instructions in this Owner's Manual, do not use this product. Call the Toll-free Helpline (1-855-345-
3934) for assistance. The operation of any power tool can result in foreign objects being thrown
into your eyes, which can result in severe eye damage. Before operating a power tool, always wear
safety goggles, safety glasses with side shields, or a full face shield when needed. We recommend
a Wide Vision Safety Mask for use over eyeglasses or standard safety glasses with side shields.
Always use eye protection that is marked to comply with ANSI Z87.1.
WARNING
The operation of any power tool can result in foreign objects being thrown into your eyes,
which can result in severe eye damage. Before beginning power tool operation, always
wear safety goggles or safety glasses with side shields and, when needed, a full face
shield. We recommend Wide Vision Safety Mask for use over eyeglasses or standard
safety glasses with side shields. Always use eye protection which is marked to comply
with ANSI Z87.1.
DANGER Indicates an imminently hazardous situation, which, if not
avoided, will result in death or serious injury.
WARNING Indicates a potentially hazardous situation, which, if not avoided,
could result in death or serious injury.
CAUTION Indicates a potentially hazardous situation, which, if not avoided,
may result in minor or moderate injury.
CAUTION (Without Safety Alert Symbol) Indicates a situation that may
result in property damage.
SYMBOLS
SAVE THESE INSTRUCTIONS
6
SYMBOL SIGNAL MEANING

7
KNOW YOUR STRING TRIMMER
Fig. 1
3
4
5
6
1
2
8
7

8
KNOW YOUR STRING TRIMMER (See Figure 1.)
The safe use of this product requires an understanding of the information on the product and in
this operator’s manual as well as a knowledge of the project you are attempting. Before use of this
product, familiarize yourself with all operating features and safety rules.
1. BATTERY PACK LATCH
Press to release the battery pack from the tool.
2. REAR HANDLE
Ergonomic handle with overmold improves comfort and grip.
3. AUXILIARY HANDLE
The string trimmer is equipped with an auxiliary handle for ease of operation and to prevent loss
of control.
4. COUPLER
The coupler connects and locks the two shafts.
5. TRIMMER SHAFT
The trimmer shaft encloses and protects the cables between the motor and rear handle.
6. GUARD
The trimmer includes a guard that helps protect from ying debris.
7. LOCK-OUT BUTTON
The lock-out button prevents accidental starting.
8. SWITCH TRIGGER
To turn the string trimmer On and Off.
KNOW YOUR STRING TRIMMER

9
A SS EM B LY
WARNING
Do not use this product if any parts on the packing list are already assembled to your product when
you unpack it. Parts on this list are not assembled to the product by the manufacturer and require
customer installation. Use of a product that may have been improperly assembled could result in
serious personal injury.
PACKING LIST
Part Name Figure Qty
String trimmer 1
Auxiliary handle 1
Guard 1
Edge guide 1
Operator's manual
40V Brushed String Trimmer
Readall safety rules and instructions carefully before operating this tool.
Owner’s Manual
TOLL-FREEHELPLINE: 1-888-90WORKS (888.909.6757)
www.GreenWorksTools.com
2101602
1
UNPACKING
This product requires assembly.
• Carefully remove the product and any accessories from the box. Make sure that all items
listed in the packing list are included.
• Inspect the tool carefully to make sure no breakage or damage occurred during shipping.
• Do not discard the packing material until you have carefully inspected and satisfactorily
operated the tool.
• If any parts are damaged or missing, please call 1-855-345-3934.

A SS EM B LY
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WARNING
If any parts are damaged or missing, do not operate this product until the parts are replaced. Use
of this product with damaged or missing parts could result in serious personal injury.
WARNING
Do not attempt to modify this product or create accessories not recommended for use with this
string trimmer. Any such alteration or modification is misuse and could result in a hazardous
condition leading to possible serious personal injury.
WARNING
Do not connect to power supply until assembly is complete. Failure to comply could result in
accidental starting and possible serious personal injury.
ATTACHING THE EDGE GUIDE
The edge guide can limit the cutting range of the cutting line and reduce the risk of the rotating
cutting line causing damage.
To use the edge guide, press the edge guide onto the trimmer head.
Fig. 2.1
Fig. 2.2

ATTACHING THE GUARD (See Figure 3.)
NOTE: Install the guard before the attachment is connected to the lower shaft.
1. Invert the string trimmer to access the trimmer head.
2. Remove supplied screws (1) from the trimmer head (4) with a philips head screwdriver (not
included).
Fig. 3.1
1
3. Place the guard (2) on to the trimmer head.
4. Align the screw holes on the guard (3) with the screw holes on the trimmer head (4)
Fig. 3.2
2
34
5. Insert the screws into the trimmer head, fastening the guard in place using a philips head
screwdriver (not included).
Fig. 3.3
A SS EM B LY

A SS EM B LY
12
INSTALLING THE UPPER SHAFT TO THE LOWER SHAFT (See Figure 4.)
WARNING
Never install, remove, or adjust any attachment while string trimmer is running. Failure to stop the
motor can cause serious personal injury.
The attachment connects to the power head by means of a coupler device.
1. Set the unit on a at, level surface.
2. Loosen the knob (1) on the coupler (5).
3. Push in the release button (2) located on the lower shaft (3). Align the release button with
the positioning hole (4) and slide the two shafts together. Rotate the lower shaft until the
button locks into the positioning hole.
4
2
3
1
5
Fig. 4.1
2
NOTE: If the button does not release completely in the positioning hole, the shafts are not locked
into place. Slightly rotate from side to side until the button is locked into place.
4. Tighten the knob securely.
Fig. 4.2
LOOSE
N
5
TIGHTEN 1

A SS EM B LY
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ATTACHING THE AUXILIARY HANDLE (See Figure 5.)
1. Loosen the four screws (1) in the handle with a philips screwdriver (not included) and
remove the screws from the handle.
Fig. 5.1
1
2. Attach the auxiliary handle (2) and lower clamp (3) on the shaft.
3. Adjust handle up or down, if necessary, to desired operating position.
Fig. 5.2
4. Tighten the four screws so that the handle cannot be rotated on the shaft.
Fig. 5.3

ADJUSTING THE CUTTING SWATH (See Figure 6.)
This trimmer is equipped with a line cut-off blade on the guard. The line cut off blade
continuously trims the line to ensure a consistent and efficient cut diameter. Advance line
whenever you hear the engine running faster than normal, or when trimming efficiency
diminishes. This will maintain best performance and keep line long enough to advance properly.
This trimmer is currently set at the 14 in. cutting swath. To adjust to a cutting swath of 16 in.:
• Remove the battery pack.
• Loosen the blade screw then rotate the line cut-off blade 180°.
• Tighten the blade screw.
Screw
Cut-off blade
Fig. 6
A SS EM B LY
14

15
OPERATION
WARNING
Read and understand entire Operator's Manual for each optional attachment used on this power
head and follow all warnings and instructions. Failure to follow all instructions may result in electric
shock, re and/or serious personal injury.
WARNING
Do not allow familiarity with this product to make you careless. Remember that a careless fraction
of a second is sufcient to inict serious injury.
WARNING
Do not use any attachments or accessories not recommended by the manufacturer of this product.
The use of attachments or accessories not recommended can result in serious personal injury.
WARNING
This string trimmer is not meant to be used with brush cutter attachments. Use of a brush cutter
attachment could cause serious personal injuries or property damage.

16
INSTALLING THE BATTERY PACK (See Figure 7.)
• Insert battery pack into tool until an audible click is heard.
REMOVING THE BATTERY PACK (See Figure 7.)
• Depress the battery release button (1) in the back of the battery pack and pull battery pack out
of tool.
1
STARTING AND STOPPING THE TRIMMER (See Figure 8.)
• Ensure a fully charged battery is installed into the string trimmer.
• To start the string trimmer, press and hold the safety lock button (1) and squeeze the switch trigger
(2).
• To stop the string trimmer, release switch trigger to stop.
12Fig. 8
OPERATION
Fig. 7

17
OPERATING THE TRIMMER (See Figure 9.)
WARNING
Always hold the string trimmer away from the body keeping clearance between the body and the
string trimmer. Any contact with the string trimmer cutting head while operating can result in serious
personal injury.
Follow these tips when using the string trimmer:
• Hold the trimmer with your right hand on the reat handle and your left hand on the auxiliary
handle.
• Keep a rm grip with both hands while in operation.
• Trimmer should be held at a comfortable position with the rear handle about hip height.
• Cut tall grass from the top down. This will prevent grass from wrapping around the shaft
housing and string head which may cause damage from overhearing.
If grass becomes wrapped around the string head:
• Remove the battery pack.
• Remove the grass.
Fig. 9
OPERATION

18
OPERATION
WARNING
Any contact with the attachment cutting head can result in burns and/or other serious personal
injury.
WARNING
Read the safety information for safe operation when using a blade attachment and refer to the
safety rules and instructions in your attachment manual. Never use a brush cutter attachment with
this electric power head. Improper operation of a blade or any attachment could result in serious
injury.
ADVANCING LINE (See Figure 10.)
While the string trimmer is operating, the cutting line gets worn down and becomes shorter.
This trimmer is equipped with bump feed line advancement, which advances additional line
once the head is bumped on the ground while rotating. The cutting blade will cut the line to
keep an accurate cutting swath.
Bump knob Fig. 10

19
OPERATION
REPLACING THE LINE (See Figure 11.)
1. Press the tabs simultaneously on the side of the trimmer head and remove cover and spool.
Cover
Spool
Fig. 11.1
Tab
2. Remove any remaining line.
3. Clean dirt and debris from all parts. Replace spool if it is worn or damaged.
4. Replace with a pre-wound spool, or replace line using 25 feet (8 meters) of 0.080 inch (2.0
mm) diameter line.
WARNING
Never use wire, rope, string, etc., which can break off and become a dangerous projectile.
5. When installing new line on an existing spool, hold the spool as shown.

20
OPERATION
6. Bend the line at the midpoint and insert the bend into the slot in the center rim of the spool.
Ensure line snaps into position in the slot.
Slot
Fig. 11.2
7. With your nger between the lines, wrap the lines evenly and rmly around the spool in a
clockwise direction.
Fig. 11.3
8. Position the lines in the guide slots.
Fig. 11.4