Ego Power+ ST1520 User manual

OPERATOR'S MANUAL
56-VOLT LITHIUM-ION
CORDLESS
15" STRING TRIMMER
MODEL NUMBER
ST1520/ST1520-FC(CARBON FIBER, STRAIGHT SHAFT)
ST1510/ST1510-FC(ALUMINUM, STRAIGHT SHAFT)
ST1520S/ST1520S-FC(CARBON FIBER, HINGED SHAFT)
ST1510S/ST1510S-FC(ALUMINUM, HINGED SHAFT)
WARNING: To reduce the risk of injury, the user must read and understand the
Operator’s Manual before using this product. Save these instructions for future reference.
Español p. 73
Français p. 35
17-0906_EGO_ST1520 & ST1520S_StringTrimmer_manual_NA_V1

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER2
TABLE OF CONTENTS
Safety Symbols ..........................................4
Safety Instructions......................................5-8
Introduction .............................................9
Specications ...........................................9
Packing List ............................................10
Description .........................................11-12
Assembly ...........................................13-16
Operation ...........................................17-24
Maintenance ........................................25-28
Troubleshooting ......................................29-31
Warranty ...........................................32-33

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER 3
READ ALL INSTRUCTIONS!
READ & UNDERSTAND
OPERATOR’S MANUAL
WARNING: Some dust created by power sanding, sawing, grinding, drilling
and other construction activities contains chemicals known to the state of California
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 from these exposures 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 those dust masks that are specially
designed to lter out microscopic particles.

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER4
SAFETY SYMBOLS
The purpose of safety symbols is to attract your attention to possible dangers. The
safety symbols and the explanations with them deserve your careful attention and
understanding. The symbol warnings do not, by themselves, eliminate any danger.
The instructions and warnings they give are no substitutes for proper accident
prevention measures.
WARNING: Be sure to read and understand all safety instructions in this
Operator’s Manual, including all safety alert symbols such as “DANGER,” “WARNING,”
and “CAUTION” before using this tool. Failure to following all instructions listed below
may result in electric shock, re, and/or serious personal injury.
SYMBOL MEANING
SAFETY ALERT SYMBOL: Indicates DANGER, WARNING, OR CAUTION.
May be used in conjunction with other symbols or pictographs.
WARNING! The operation of any power tools 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 shield and 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
which is marked to comply with ANSI Z87.1.

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER 5
SAFETY INSTRUCTIONS
This page depicts and describes safety symbols that may appear on this product. Read,
understand, and follow all instructions on the machine before attempting to assemble
and operate it.
Safety Alert Indicates a potential personal injury hazard.
Read &
Understand
Operator's
Manual
To reduce the risk of injury, user must read and
understand the operator’s manual before using
this product.
Eye Protection
Always wear safety goggles or safety glasses
with side shields and a full face shield when
operating this product.
Recycle Symbols
This product uses lithium-ion (Li-ion) batteries.
Local, state, or federal laws may prohibit disposal
of batteries in ordinary trash. Consult your
local waste authority for information regarding
available recycling and/or disposal options.
IPX4 Ingress Protection
Degree Protection from splashing water
V Volt Voltage
mm Millimeter Length or size
cm Centimeter Length or size
in. Inch Length or size
kg Kilogram Weight
lb Pound Weight
Direct Current Type or a characteristic of current
RPM Revolutions per
minute Rotational speed

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER6
IMPORTANT SAFETY INSTRUCTIONS
WARNING! When using electric trimmers, basic safety precautions should
always be followed to reduce the risk of re, electric shock, and personal injury,
including the following:
DANGER! Do not rely on the tool’s insulation against electric shock. To reduce
the risk of electrocution, never operate the tool in the vicinity of any wires or cables
which may carry electric current.
CAUTION! Wear appropriate personal hearing protection during use. Under some
conditions and durations of use, noise from this product may contribute to hearing loss.
◾Keep Children Away - All visitors should be kept at least 100 feet away from
work area.
◾Avoid Dangerous Environments – Don’t use appliances on damp or wet slope.
◾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.
◾Use Safety Glasses - Always use face or dust mask if operation is dusty.
◾Use the Right Tool - Do not use the tool for any job except that for which it is
intended.
◾Don’t Force the Trimmer - It will do the job better and with less likelihood of a
risk of injury at the rate for which it was designed.
◾Don’t Overreach - Keep proper footing and balance at all times.
◾Stay Alert - Watch what you are doing. Use common sense. Do not operate the
trimmer when you are tired.
◾Do not operate the trimmer while under the influence of alcohol or drugs.
◾Keep guards in place and in working order.
◾Keep hands and feet away from the cutting area.
◾Store Trimmer Indoors - When not in use the trimmer should be stored indoors in a
dry and high or locked-up place with the battery pack removed- out of reach of children.
◾Maintain Trimmer With Care - Keep the cutting attachment clean for best
performance and to reduce the risk of injury. Follow the instructions for changing
accessories. Keep the handles dry, clean, and free from oil and grease.

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER 7
◾Check Damaged Parts - Before further use of the trimmer, 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, mounting, 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.
◾Clear the area to be cut before each use. Remove all objects such as rocks, broken
glass, nails, wire, or string that can be thrown or become entangled in the cutting
attachment. Make sure that other persons and pets are at least 100 ft. (30.5m) away.
◾Always hold the trimmer firmly, with both hands on the handles, while
operating. Wrap your fingers and thumbs around the handles.
◾Avoid Accidentally Starting - Don’t carry the trimmer with your nger on
the trigger.
◾Do not operate the trimmer in gaseous or explosive atmospheres. Motors
in these appliances normally spark, and the sparks might ignite fumes.
◾Damage to Trimmer - If you strike a foreign object with the trimmer or it
becomes entangled, stop the tool immediately, check for damage and have any
damage repaired before further operation is attempted. Do not operate with a
broken guard or spool.
◾If the equipment should start to vibrate abnormally, stop the motor and
check immediately for the cause. Vibration is generally a warning of trouble.
A loose head may vibrate, crack, break or come off the trimmer, which may result
in serious or fatal injury. Make sure that the cutting attachment is properly xed
in position. If the head loosens after xing it in position, replace it immediately.
Never use a trimmer with a loose cutting attachment.
◾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.
◾Check the cutting attachment at regular short intervals during operation,
or immediately if there is a noticeable change in cutting behavior.
◾When replacing the cutting line, use no more than 2.4mm 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.

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER8
◾To reduce the risk of injury from loss of control, never work on a ladder
or on any other insecure support. Never hold the cutting attachment
above waist height.
◾If situations occur that are not covered in this manual, use care and
good judgment. Contact the EGO Customer Service Center for assistance.
◾Do not charge the battery pack in rain, or in wet locations.
◾Use only with the battery packs and chargers listed below:
BATTERY PACK CHARGER
BA1120, BA1120-FC, BA1400, BA1400-FC,
BA2240, BA2240-FC, BA2800, BA2800-FC,
BA4200, BA4200-FC, BA1400T, BA1400T-FC,
BA2800T, BA2800T-FC, BA4200T, BA4200T-FC,
BA5600T, BA5600T-FC
CH2100, CH2100-FC,
CH5500, CH5500-FC
◾Do not dispose of the battery in a fire. The cells may explode. Check with
local codes for possible special disposal instructions.
◾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.
◾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.
◾Replacement Parts - When servicing, use only identical EGO replacement parts.
Use of any other accessory or attachment may increase the risk of injury.
◾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.
◾Remove or disconnect battery pack before servicing, cleaning or
removing material from the trimmer.
◾Do not wash with a hose; avoid getting water in motor and electrical
connections.
◾Do not incinerate the appliance even if it is severely damaged. The
batteries can explode in a re.
◾Do not expose a battery pack or tool to fire or excessive temperature.
Exposure to re or temperature above 212 °F (100°C) may cause explosion.
◾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!

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER 9
INTRODUCTION
Congratulations on your selection of the EGO 56-Volt Lithium-Ion Cordless 15" String
Trimmer. It has been designed, engineered and manufactured to give you the best
possible dependability and performance.
Should you experience any problem you cannot easily remedy, please contact EGO
customer service center 1-855-EGO-5656.
This manual contains important information on to the safe assembly, operation and
maintenance of your string trimmer. Read it carefully before using the string trimmer.
Keep this manual handy so you can refer to it at any time.
SERIAL NUMBER _____________________ DATE OF PURCHASE _________________
YOU SHOULD RECORD BOTH SERIAL NUMBER AND DATE OF PURCHASE AND KEEP THEM IN A
SAFE PLACE FOR FUTURE REFERENCE
SPECIFICATIONS
Voltage 56V
No-load speed 4000~5800 RPM
Cutting Mechanism Bump Head
Line-Loading Mechanism Motor driven
Cutting Line Type 0.095 in. (2.4 mm) nylon twist line
Cutting Width 15 in. (38 cm)
Recommended Operating Temperature 32°F-104°F(0°C-40°C)
Recommended Storage Temperature -4°F-158°F(-20°C-70°C)
Weight (Without battery pack)
7.28 lb.(3.3Kg) (ST1520/ST1520-FC/
ST1520S/ST1520S-FC)
7.50 lb.(3.4Kg) (ST1510/ST1510-FC/
ST1510S/ST1510S-FC)

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER10
Recommended Cutting Line
PART NAME TYPE MODEL NUMBER
Cutting Line 0.095 in./2.4 mm twist line AL2415S/AL2450S/AL2420P
PACKING LIST
PART NAME QUANTITY
String trimmer 1
Guard 1
Front-assist handle assembly 1
Hex wrench 1
Bolt for locking shaft
(ST1520S/ST1510S/ST1520S-FC/ST1510S-FC Only) 1
Cutting line 1
Operator's manual 1

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER 11
DESCRIPTION
KNOW YOUR STRING TRIMMER (Fig. 1)
The safe use of this product requires an understanding of the information on the tool and
in this operator’s manual, as well as knowledge of the project you are attempting. Before
using this product, familiarize yourself with all operating features and safety rules.
1
Adjustable Front-Assist Handle
Guard
Line-cutting Blade
Release Tab
Cutting Line
Trimmer Head
(Bump Head)
Line-Loading
Button
Hex Wrench
Ejection Mechanism
Latch
Battery-Release Button
Switch Trigger
Electric Contacts
Lock-Off Button
Hinge (ST1520S/ST1510S/
ST1520S-FC/ST1510S-FC Only)
Rear Handle
WARNING: Never operate the tool without the guard rmly in place. The guard
must always be on the tool to protect the user.

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER12
ADJUSTABLE FRONT-ASSIST HANDLE
For easy control of the trimmer during cutting.
REAR HANDLE
Ergonomic handle with overmold improves comfort and grip.
VARIABLE-SPEED SWITCH TRIGGER
Turns the string trimmer On and Off and adjusts the trimmer head speed.
LOCK-OFF BUTTON
Helps prevent accidental or unauthorized activation of the trigger. It must be depressed
before the trigger can be activated.
LINE-LOADING BUTTON
Press this button to automatically wind the line into the trimmer head.
HINGE (ST1520S/ST1510S/ST1520S-FC/ST1510S-FC Only)
Connects and locks the two foldable shafts.
TRIMMER HEAD (BUMP HEAD)
Stores the cutting line and releases the cutting line when the head is lightly tapped on
the ground during operation.
GUARD
Reduces the risk of injury from foreign objects ung backwards toward the operator
and from contact with the cutting attachment.
LINE-CUTTING BLADE
Steel blade on the guard that maintains the cutting line at the proper length.
BATTERY-RELEASE BUTTON
Releases the battery pack from the tool.
LATCH
Secures the battery pack to the tool.
EJECTION MECHANISM
Aids in battery removal.

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER 13
ASSEMBLY
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 modication is
misuse and could result in a hazardous condition leading to possibly serious personal
injury.
WARNING: Always remove the battery pack from the product when you are
assembling parts, making adjustments, cleaning, or when the product is not in use.
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 that 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 return the product to the place of
purchase.

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER14
UNFOLDING THE SHAFT (ONLY FOR ST1520S/ST1510S/ST1520S-FC/
ST1510S-FC)
WARNING: In order to avoid pinching your hands or ngers, do not hold the
shaft at the joint.
WARNING: Do not attempt to
start the trimmer until the shaft has been
locked.
1. Remove the battery pack from the
trimmer.
2. Put your trimmer on the ground or
the oor and make sure that the
cable is inside the shaft, so that it
will not be pinched when closing
the joints. Carefully unfold the shaft
until the two holes in the joint are
accurately aligned (Fig. 2).
3. Insert the bolt (supplied) and tighten
it with the supplied hex wrench to
lock the shaft in place (Fig. 3).
2
3

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER 15
MOUNTING THE GUARD
WARNING: Always wear gloves when mounting or replacing the guard. Be careful
of the blade on the guard and wear gloves to protect your hands from being injured by the
blade.
1. Remove the battery pack from the
trimmer.
2. Lay the trimmer on the ground or
the oor with the trimmer head
facing upward.
3. Align the two bolts, which are
preassembled on the guard, with
the two screw holes in the shaft
(Fig. 4), and then tighten them with
the supplied hex wrench (Fig. 5).
4
5

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER16
MOUNTING AND ADJUSTING THE FRONT-ASSIST HANDLE
1. Remove the battery pack from the trimmer.
2. Loosen the four screws in the
handle with the supplied hex
wrench and remove the screws and
the lower clamp from the front-
assist handle (Fig. 6).
3. Refer to Fig.7: attach the front-
assist handle and the lower clamp
onto the shaft and secure them by
pre-tightening the four screws. Turn
the front-assist handle upward
so that it points toward the top of
the rear handle.
4. Adjust the front-assist handle
position so that it is between the
rear handle housing and the joint
of the shaft, as shown in Fig. 8.
For ST1520/ST1510/ST1520-FC/
ST1510-FC, adjust the handle
position so that it is between
the rear handle housing and the
warning label on the shaft. The
handle should be adjusted so that
your front arm will be straight when
using the trimmer.
5. Use the supplied hex wrench to
tighten the four screws so that the
handle cannot be rotated on the
shaft.
7
8
6Front-Assist Handle
Screw
Lower Clamp

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER 17
OPERATION
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: Always wear eye protection marked that it complies with ANSI Z87.1,
along with hearing protection. Failure to do so could result in objects being thrown into
your eyes and other possible serious injuries.
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.
APPLICATION
You may use this product for the purposes listed below:
Trimming: use for removing grass and weeds along walls, fences, trees and borders.
Cutting: use for cutting grass that is difcult to reach using a normal mower.
TO INSTALL/REMOVE BATTERY PACK (Fig. 9 & 10)
WARNING: Always remove the battery pack from the product when you are
assembling parts, making adjustments, cleaning, or when it is not in use. Removing the
battery pack will prevent accidental starting that could cause serious personal injury.
NOTE: Fully charge the battery pack before rst use.

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER18
To install battery pack (Fig. 9)
1. Align the ribs of the battery pack
with the battery-mounting slots in
the string trimmer.
2. Slide the battery pack in until it
snaps into position.
NOTE: Make sure that the latch on the
string trimmer snaps into place and the
battery pack is secured to the tool before
beginning operation.
To remove battery pack (Fig. 10)
WARNING: Always be aware of the
location of your feet and children or pets
around you when pressing the battery
release button. Serious injury could result
if the battery pack falls. NEVER remove
the battery pack at a high location.
1. Hold the battery pack in the palm of your hand.
2. Press the battery-release button with your thumb; the battery pack will disengage
from the latch.
3. Grasp the battery pack and remove it from the string trimmer.
9
Battery-mounting Slot
Latch
10 Press to Release

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER 19
HOLDING THE STRING TRIMMER
WARNING: Dress properly to
reduce the risk of injury when operating
this tool. Do not wear loose clothing
or jewelry. Wear eye and ear/hearing
protection. Wear heavy, long pants, boots
and gloves. Do not wear short pants or
sandals or go barefoot. Before operating
the unit, stand in the operating position
and check that:
◾The operator is wearing eye
protection and proper clothing.
◾One arm is slightly bent, and the
hand on that arm is holding the rear
handle.
◾The other arm is straight, and that hand is holding the front-assist handle.
◾The trimmer head is parallel to the ground and easily contacts the material to be
cut without the operator having to bend over (Fig. 11).
STARTING/STOPPING THE STRING TRIMMER
Before starting the string trimmer
◾Make sure that you have a secure and balanced footing.
◾Stand upright and hold the string trimmer in a relaxed position.
◾Make sure that the cutting line is not touching the ground or any other objects.
◾Hold the string trimmer with both hands: one hand on the rear handle and one
hand on the front-assist handle.
11

56-VOLT LITHIUM-ION CORDLESS 15" STRING TRIMMER20
To start the string trimmer
(Fig. 12)
1. Press the lock-off button down and
hold it in that position. Press the
switch trigger to turn on the string
trimmer. Release the lock-off button
and continue to squeeze the switch
trigger for continued operation.
2. The rotational speed of the trimmer
head is controlled with the switch
trigger. More pressure on the trigger results in higher speed; less pressure on the
trigger results in lower speed. Adjust the speed to suit the task at hand.
NOTICE: The motor runs only when the lock-off button and switch trigger are both
pressed.
To stop the string trimmer
Release the switch trigger to stop the string trimmer.
WARNING: Always remove the battery pack from the string trimmer during work
breaks and after nishing work.
USING THE STRING TRIMMER
WARNING: To avoid serious personal injury, wear goggles or safety glasses at all
times when operating this unit. Wear a face mask or dust mask in dusty locations.
WARNING: To prevent serious personal injury, remove the battery pack from the
tool before servicing, cleaning, changing attachments or removing material from the unit.
Clear the area to be cut before each use. Remove all objects, such as rocks, broken
glass, nails, wire, or string that can be thrown or become entangled in the cutting
attachment. Clear the area of children, bystanders, and pets. Keep all children,
bystanders and pets at least 100 ft. (30.5m) away; there still may be risk to bystanders
from thrown objects. Bystanders should be encouraged to wear eye protection. If you
are approached, stop the motor immediately.
12
Lock-off Button
Switch Trigger