DeWalt DCST990, DCST990B Instruction Manual

DCST990, DCST990B 40V Max* Lithium Brushless String Trimmer
Taille-bordure sans balaisDCST990, DCST990B au lithium-ion de 40V max.*

Podadora de cuerda sin escobillas y con batería de iones de litio de 40V Máx* DCST990, DCST990B

INSTRUCTION MANUAL
GUIDE D'UTILISATION
MANUAL DE INSTRUCCIONES

INSTRUCTIVO DE OPERACIÓN, CENTROS DE SERVICIO Y PÓLIZA DE
GARANTÍA. ADVERTENCIA: LÉASE ESTE INSTRUCTIVO ANTES DE
USAR EL PRODUCTO.

If you have questions or comments, contact us.

Pour toute question ou tout commentaire, nous contacter.

Si tiene dudas o comentarios, contáctenos.

1-800-4-DeWALT • www.dewalt.com

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Definitions: Safety Guidelines

The definitions below describe the level of severity for each signal
word. Please read the manual and pay attention to these symbols.

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.
NOTICE: Indicates a practice not related to personal injury
which, if not avoided, may result in property damage.

KEY INFORMATION YOU SHOULD KNOW

•

WARNING:

Do not remove guard. The guard
must be attached when trimming. Operating this trimmer without
the guard will violate the product warranty.

•

CAUTION:

When replacing the line, .080
inches (2.032 mm) diameter line (MODEL NO. DWO1DT801 OR
DWO1DT802) is recommended.

• For use only with DCB404 and DCB406 D

eWALT batteries.

IF YOU HAVE ANY QUESTIONS OR COMMENTS ABOUT
THIS OR ANY D

eWALT APPLIANCE, CALL US TOLL FREE AT:

1-800-4-D

eWALT (1-800-433-9258).

Important Safety Warnings

WARNING: When using electric gardening appliances,

basic safety precautions should always be followed to reduce risk of
fire, electric shock, and personal injury, including the following.

READ ALL INSTRUCTIONS

• ALWAYS WEAR EYE PROTECTION – Wear safety spectacles

or goggles at all times when battery is installed. These items are
available for purchase.

• DRESS PROPERLY – Do not wear loose clothing or jewelry. They

can be caught in moving parts. Gloves and substantial rubber
soled footwear are recommended when working outdoors. Don’t
operate the appliance when barefoot or wearing open sandals.
Wear heavy long pants to protect your legs. Wear protective hair
covering to contain long hair.

• NYLON LINE – Keep face, hands and feet clear of rotating nylon

line at all times.

• THE ROTATING LINE PERFORMS A CUTTING FUNCTION –

Use care when trimming around screens and desirable plantings.

• DO NOT USE materials not recommended, such as metal wire,

rope, and the like.

• KEEP ALL BYSTANDERS AWAY – at a safe distance from work

area, especially children.

• MAKE SURE that other persons and pets are at least 100 feet

(30m) away.

• TO REDUCE THE RISK of rebound (ricochet) injury, work going

away from any nearby solid object such as wall, steps, large stone,
tree, etc. Use great care when working close to solid objects and
where necessary, do trimming by hand.

• AVOID ACCIDENTALLY STARTING – Don’t carry with finger on

trigger when battery is installed.

• USE THE RIGHT APPLIANCE – Do not use this appliance for any

job except that for which it is intended.

•

DON’T OVERREACH

– Keep proper footing and balance at all times.

•

DON’T FORCE APPLIANCE

– It will do the job better and with less

likelihood of a risk of injury at the rate for which it was designed

• DAMAGE TO UNIT – If you strike or become entangled with a

foreign object, stop appliance immediately, remove battery, check

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• Do not charge appliance in rain, or in wet locations

WARNING: Do not use appliance if the switch trigger

does not turn the appliance on or off. Any appliance that can not be
controlled with the switch trigger is dangerous and must be repaired.

WARNING: Some dust created by this product

contains chemicals known to the State of California to cause cancer,
birth defects or other reproductive harm. Some examples of these
chemicals are:

• compounds in fertilizers

• compounds in insecticides, herbicides and pesticides

• arsenic and chromium from chemically treated lumber

To reduce your exposure to these chemicals, wear approved safety
equipment such as dust masks that are specially designed to filter out
microscopic particles.

WARING: This product is not recommended to be

used for edging.

• The label on your appliance may include the following symbols. The
symbols and their definitions are as follows:

V ................... volts A ...................... amperes

Hz ................. hertz W ..................... watts

min ............... minutes

or AC ..........alternating

or DC ... direct current current

................. Class I Construction no ....................no load

(grounded) ........................speed

................. Class II Construction

(double insulated) …/min ..............per minute

RPM ............. revolutions per

.....................earthing

minute terminal

.................. safety alert symbol

for damage and have any damage repaired before further operation
is attempted. Do not operate with a broken hub or spool.

• REMOVE BATTERY – when not in use, when replacing line, or

prior to cleaning.

• AVOID DANGEROUS ENVIRONMENTAL CONDITIONS – Do

not use electric appliances in damp or wet locations. Follow all
instructions in this Instruction Manual for proper operation of your
appliance. Don’t use the appliance in the rain.

• DO NOT OPERATE portable electric appliances in gaseous or

explosive atmospheres. Motors in these appliances normally spark,
and the sparks might ignite fumes.

• STORE IDLE APPLIANCES INDOORS – When not in use, appliances

should be stored indoors in a dry, locked-up place out of reach of children.

• STAY ALERT – Do not operate this unit when you are tired, ill, or

under the influence of alcohol, drugs, or medication.

• MAINTAIN APPLIANCES WITH CARE – Follow instructions in

maintenance section. Keep handles dry, clean and free from oil
and grease.

• 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, 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 otherwise indicated elsewhere in this manual.

• DO NOT immerse appliance in water or squirt it with a hose. DO

NOT allow any liquid to get inside it.

• DO NOT store the appliance on or adjacent to fertilizers or chemicals.

• DO NOT clean with a pressure washer.

• Keep guards in place and in working order.

• Keep hands and feet away from cutting area.

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the battery pack. Do not use a battery pack or charger that has
received a sharp blow, been dropped, run over or damaged in any way
(e.g., pierced with a nail, hit with a hammer, stepped on). Damaged
battery packs should be returned to the service center for recycling.

WARNING Fire hazard. Do not store or carry

the battery pack so that metal objects can contact exposed
battery terminals. For example, do not place the battery pack in

aprons, pockets, appliance boxes, product kit boxes, drawers, etc.,
with loose nails, screws, keys, etc. Transporting batteries can

possibly cause fires if the battery terminals inadvertently come
in contact with conductive materials such as keys, coins, hand
appliances and the like. The US Department of Transportation

Hazardous Material Regulations (HMR) actually prohibit transporting
batteries in commerce or on airplanes (e.g., packed in suitcases and
carry-on luggage) UNLESS they are properly protected from short
circuits. So when transporting individual battery packs, make sure that
the battery terminals are protected and well insulated from materials
that could contact them and cause a short circuit.

Transportation

Your DeWALT batteries comply with all applicable shipping
regulations as prescribed by industry and legal standards, including
UN Recommendations on the Transport of Dangerous Goods;
International Air Transport Association (IATA) Dangerous Goods
Regulations, International Maritime Dangerous Goods (IMDG)
Regulations, and U.S. Department of Transportation Regulations.
Lithium-ion cells and batteries have been tested to section 38.3 of the
UN Recommendations on the Transport of Dangerous Goods Manual
of Tests and Criteria.

The shipping or transportation of the battery in this product is restricted
and may be classified as a Class 9 Hazardous material.

Important Safety Instructions for All
Battery Packs

When ordering replacement battery packs, be sure to include the
catalog number and voltage. Consult the chart at the end of this
manual for compatibility of chargers and battery packs.

The battery pack is not fully charged out of the carton. Before using
the battery pack and charger, read the safety instructions below and
then follow charging procedures outlined.

READ ALL INSTRUCTIONS

• Do not charge or use the battery pack in explosive
atmospheres, such as in the presence of flammable liquids,
gases or dust. Inserting or removing the battery pack from the

charger may ignite the dust or fumes.

• Never force the battery pack into the charger. Do not modify

the battery pack in any way to fit into a non-compatible
charger as battery pack may rupture causing serious
personal injury. Consult the chart at the end of this manual for

compatibility of batteries and chargers.

• Charge the battery packs only in designated DeWalt chargers.

• DO NOT splash or immerse in water or other liquids.

• Do not store or use the appliance and battery pack in

locations where the temperature may reach or exceed
105°F (40°C) (such as outside sheds or metal buildings in
summer). For best life store battery packs in a cool, dry location.

NOTE: Do not store the battery packs in a appliance with the

trigger switch locked on. Never tape the trigger switch in the
ON position.

WARNING: Fire hazard. Never attempt to open the

battery pack for any reason. If the battery pack case is cracked or
damaged, do not insert into the charger. Do not crush, drop or damage

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created. However, no warranty, expressed or implied, is given. The
shipper is responsible to comply with the applicable regulations.

SPECIFIC SAFETY INSTRUCTIONS FOR LITHIUM ION (Li-Ion)

• Do not incinerate the battery pack even if it is severely
damaged or is completely worn out. The battery pack can

explode in a fire. Toxic fumes and materials are created when
lithium ion battery packs are burned.

• If battery contents come into contact with the skin,
immediately wash area with mild soap and water. If battery
liquid gets into the eye, rinse water over the open eye for 15
minutes or until irritation ceases. If medical attention is needed,
the battery electrolyte is composed of a mixture of liquid organic
carbonates and lithium salts.

• Contents of opened battery cells may cause respiratory irritation.
Provide fresh air. If symptoms persist, seek medical attention.

WARNING: Burn hazard. Battery liquid may be

flammable if exposed to spark or flame.

The RBRC™ Seal

The RBRC™ (Rechargeable Battery Recycling
Corp oration) Seal on the nickel cadmium, nickel metal
hydride or lithium ion batteries (or battery packs)
indicate that the costs to recycle these batteries (or
battery packs) at the end of their useful life have already
been paid by D

eWALT. In some areas, it is illegal to

place spent nickel cadmium, nickel metal hydride or lithium ion
batteries in the trash or municipal solid waste stream and the RBRC
program provides an environmentally conscious alternative.
RBRC™, in cooperation with D

eWALT and other battery users, has

established programs in the United States and Canada to facilitate
the collection of spent nickel cadmium, nickel metal hydride or
lithium ion batteries. Help protect our environment and conserve
natural resources by returning the spent nickel cadmium, nickel metal

SHIPPING BY AIRPLANE (BY AIR) OR SHIP (BY SEA)

• Contact your carrier for up to date instructions. Have your contents
(including the battery) with you when contacting them. The
specifications written on them will be needed to prepare them for
shipment, pack them in a compliant box, and properly label the box.

SHIPPING BY GROUND (HIGHWAY OR RAIL)

• The original product box and its packing material can be used for
shipping by ground within the United States and Canada with the
following stipulations:

1. The battery and all other contents must be in their original

packing materials and arranged as received (including the
battery in its original plastic bag and battery box).

2. The original product box and all other packing materials must

be undamaged.

3. The shipment must be include a document which contains the

following:

• The package contains lithium-ion cells or batteries.

• The package must be handled with care and that a

flammability hazard exists if the package is damaged.

• Special procedures should be followed in the event the

package is damaged, to include inspection and repacking if
necessary.

• The telephone numbers for additional information (US and

Canada 1-888-698-2571, Elsewhere [phone]).

• To ship by ground in a generic box, contact your carrier for

up to date instructions. Have your contents (including the
battery) with you when contacting them. The specifications
written on them will be needed to prepare them for shipment,
pack them in a compliant box, and properly label the box.

It is forbidden to fly with these batteries even if the batteries are in
checked baggage.

The information provided in this section of the manual is provided in
good faith and believed to be accurate at the time the document was

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• Do not expose the charger to rain or snow.

• Pull by the plug rather than the cord when disconnecting the
charger. This will reduce the risk of damage to the electric plug and cord.

• Make sure that the cord is located so that it will not be

stepped on, tripped over or otherwise subjected to damage
or stress.

• Do not use an extension cord unless it is absolutely
necessary. Use of improper extension cord could result in risk of

fire, electric shock or electrocution.

• When operating a charger outdoors, always provide a dry
location and use an extension cord suitable for outdoor use. Use
of a cord suitable for outdoor use reduces the risk of electric shock.

• An extension cord must have adequate wire size (AWG or
American Wire Gauge) for safety. The smaller the gauge number
of the wire, the greater the capacity of the cable, that is, 16 gauge
has more capacity than 18 gauge. An undersized cord will cause a
drop in line voltage resulting in loss of power and overheating. When
using more than one extension to make up the total length, be sure
each individual extension contains at least the minimum wire size.
The following table shows the correct size to use depending on cord
length and nameplate ampere rating. If in doubt, use the next heavier
gauge. The lower the gauge number, the heavier the cord.

Minimum Gauge for Cord Sets

Ampere Rating

Volts Total Length of Cord in Feet (meters)
120V 25 (7.6) 50 (15.2) 100 (30.5) 150 (45.7)
240V 50 (15.2) 100 (30.5) 200 (61.0) 300 (91.4)

More

Than

Not More

Than

AWG

0 6 18 16 16 14

6 10 18 16 14 12
10 12 16 16 14 12
12 16 14 12 Not Recommended

hydride or lithium ion batteries to an authorized DeWALT service center
or to your local retailer for recycling. You may also contact your local
recycling center for information on where to drop off the spent battery.
RBRC™ is a registered trademark of the Rechargeable Battery

Recycling Corporation.

Important Safety Instructions for All
Battery Chargers

SAVE THESE INSTRUCTIONS: This manual contains important
safety and operating instructions for battery chargers.

• Before using the charger, read all instructions and cautionary
markings on the charger, battery pack and product using the
battery pack.

WARNING: Shock hazard. Do not allow any liquid to

get inside the charger. Electric shock may result.

CAUTION: Burn hazard. To reduce the risk of injury,

charge only D

eWALT rechargeable battery packs. Other types of

batteries may overheat and burst resulting in personal injury and
property damage.

NOTICE: Under certain conditions, with the charger plugged into the
power supply, the charger can be shorted by foreign material. Foreign
materials of a conductive nature, such as, but not limited to, grinding
dust, metal chips, steel wool, aluminum foil or any buildup of metallic
particles should be kept away from the charger cavities. Always unplug
the charger from the power supply when there is no battery pack in the
cavity. Unplug the charger before attempting to clean.

• DO NOT attempt to charge the battery pack with any
chargers other than the ones in this manual. The charger and
battery pack are specifically designed to work together.

• These chargers are not intended for any uses other than

charging D

eWALT rechargeable batteries. Any other uses may

result in risk of fire, electric shock or electrocution.

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(charging) light will blink continuously, indicating that the charging
process has started.

3. The completion of charge will be indicated by the red light
remaining ON continuously. The pack is fully charged and may be
used at this time or left in the charger.

Indicator Light Operation

PACK CHARGING

PACK CHARGED

x

HOT/COLD DEL AY

PROBLEM PACK OR CHARGER

Charge Indicators

This charger is designed to detect certain problems that can arise.
Problems are indicated by the red light flashing at a fast rate. If this
occurs, remove and then reinsert the battery pack into the charger.
If the problem persists, try a different battery pack to determine if the
charger is working properly. If the new pack charges correctly, then the
original pack is defective and should be returned to a service center
or other collection site for recycling. If the new battery pack elicits
the same trouble indication as the original, have the charger and the
battery pack tested at an authorized service center.

HOT/COLD DELAY

This charger has a hot/cold delay feature: when the charger detects a
battery that is hot, it automatically starts a delay, suspending charging
until the battery has cooled. After the battery has cooled, the charger
automatically switches to the pack charging mode. This feature
ensures maximum battery life. The red light flashes long, then short
while in the hot/cold delay mode.

• Do not place any object on top of the charger or place the
charger on a soft surface that might block the ventilation
slots and result in excessive internal heat. Place the charger

in a position away from any heat source. The charger is ventilated
through slots in the top and the bottom of the housing.

• Do not operate the charger with a damaged cord or plug.

• Do not operate the charger if it has received a sharp blow,
been dropped or otherwise damaged in any way. Take it to an
authorized service center.

• Do not disassemble the charger; take it to an authorized
service center when service or repair is required. Incorrect
reassembly may result in a risk of electric shock, electrocution or fire.

• Disconnect the charger from the outlet before attempting
any cleaning. This will reduce the risk of electric shock.
Removing the battery pack will not reduce this risk.

• NEVER attempt to connect 2 chargers together.

• The charger is designed to operate on standard 120V

household electrical power. Do not attempt to use it on any
other voltage.

Chargers

Your appliance uses a DeWALT charger.

J

FIG. 1

Be sure to read all safety instructions before
using your charger. Consult the chart at the
end of this manual for compatibility of
chargers and battery packs.

Charging Procedure (Fig. 1)

1. Plug the charger into an appropriate outlet

before inserting the battery pack.

2. Insert the battery pack (J) into the charger,

as shown in Figure 1, making sure the
pack is fully seated in charger. The red

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d. If charging problems persist, take the appliance, battery pack

and charger to your local service center.

5. The battery pack should be recharged when it fails to produce
sufficient power on jobs which were easily done previously. DO
NOT CONTINUE to use under these conditions. Follow the
charging procedure. You may also charge a partially used pack
whenever you desire with no adverse effect on the battery pack.

6. Foreign materials of a conductive nature such as, but not limited
to, grinding dust, metal chips, steel wool, aluminum foil, or any
buildup of metallic particles should be kept away from charger
cavities. Always unplug the charger from the power supply when
there is no battery pack in the cavity. Unplug the charger before
attempting to clean.

7. Do not freeze or immerse the charger in water or any other liquid.

WARNING: Shock hazard. Don’t allow any liquid

to get inside the charger. Electric shock may result.

WARNING: Burn hazard. Do not submerge the

battery pack in any liquid or allow any liquid to enter the battery pack.
Never attempt to open the battery pack for any reason. If the plastic
housing of the battery pack breaks or cracks, return to a service center
for recycling.

Storage Recommendations

1. The best storage place is one that is cool and dry, away from direct
sunlight and excess heat or cold.

2. For long storage, it is recommended to store a fully charged battery
pack in a cool dry place out of the charger for optimal results.

NOTE: Battery packs should not be stored completely depleted of
charge. The battery pack will need to be recharged before use.

SAVE THESE INSTRUCTIONS

LEAVING THE BATTERY PACK IN THE CHARGER

The charger and battery pack can be left connected with the charge
indicator showing Pack Charged.

WEAK BATTERY PACKS: Weak batteries will continue to function
but should not be expected to perform as much work.

FAULTY BATTERY PACKS: This charger will not charge a faulty
battery pack. The charger will indicate faulty battery pack by refusing
to light or by displaying problem pack or charger.

NOTE: This could also mean a problem with a charger.

Important Charging Notes

1. Longest life and best performance can be obtained if the battery
pack is charged when the air temperature is between 65 °F and
75 °F (18 ° – 24 °C). DO NOT charge the battery pack in an air
temperature below +40°F (+4.5 °C), or above +105 °F (+40.5°C).
This is important and will prevent serious damage to the battery pack.

2. The charger and battery pack may become warm to the touch
while charging. This is a normal condition, and does not indicate
a problem. To facilitate the cooling of the battery pack after use,
avoid placing the charger or battery pack in a warm environment
such as in a metal shed or an uninsulated trailer.

3. A cold battery pack will charge at about half the rate of a warm
battery pack. The battery pack will charge at that slower rate
throughout the entire charging cycle and will not return to
maximum charge rate even if the battery pack warms.

4. If the battery pack does not charge properly:

a. Check operation of receptacle by plugging in a lamp or other

appliance;

b. Check to see if receptacle is connected to a light switch which

turns power off when you turn out the lights;

c. Move the charger and battery pack to a location where the

surrounding air temperature is approximately 65 °F – 75 °F
(18° – 24°C);

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Adjustment (Fig. 3)

WARNING: To reduce the risk of serious

personal injury, turn appliance off and remove battery before
making any adjustments or removing/installing attachments
or accessories.

WARNING: Never remove the guard. Damage or

personal injury could result.

WARNING: NEVER

F

FIG. 3

5A

D

OPERATE APPLIANCE WITHOUT
GUARD FIRMLY IN PLACE. The guard

must always be properly attached on
the appliance to protect the user.

The trimmer comes fully assembled.
The auxiliary handle (D) is positioned
to maximize balance. However, if
adjustment is necessary, loosen the four
bolts (5A) with a hex wrench and slide
the auxiliary handle up or down the
trimmer pole (F) as shown in Figure 3.

OPERATION

WARNING: To reduce the risk of serious

personal injury, turn appliance off and remove battery before
making any adjustments or removing/installing attachments or
accessories.

WARNING: Always use proper eye protection that

conforms to ANSI Z87.1 (CAN/CSA Z94.3) while operating this appliance.

COMPONENTS (Fig. 2)

INTENDED USE

This string trimmer is designed for professional trimming applications.
DO NOT use under wet conditions or in presence of flammable liquids

or gases.
This string trimmer is a professional appliance. DO NOT let children

come into contact with the tool. Supervision is required when
inexperienced operators use this appliance.

A. Variable speed trigger G. Guard

B. Lock-off lever H. Spool housing
C. Speed control switch I. Battery housing
D. Auxiliary handle J. Battery pack
E. Motor housing K. Battery release button
F. Trimmer pole L. Handle

H

I

D

J

F

E

C

A

L

FIG. 2

B

G

K

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To remove battery pack: Depress the battery release button (K) in the
back of the battery housing and pull battery pack out of appliance as
shown in Figure 5.

Fuel Gauge Battery Packs (Fig. 6)

Some DeWALT battery packs include

6A

FIG. 6

a fuel gauge which consists of three
green LED lights that indicate the
level of charge remaining in the
battery pack.

To actuate the fuel gauge, press and
hold the fuel gauge button (6A). A
combination of the three green LED
lights will illuminate designating the level of charge left. When the level
of charge in the battery is below the usable limit, the fuel gauge will not
illuminate and the battery will need to be recharged.
NOTE: The fuel gauge is only an indication of the charge left on the battery
pack. It does not indicate appliance functionality and is subject to variation
based on product components, temperature and end-user application.
For more information regarding fuel gauge battery packs, please call
1-800-4-D

eWALT (1-800-433-9258) or visit our website www.dewalt.com.

Switching Trimmer On and Off (Fig. 2)

To turn the appliance on, squeeze the lock-off lever (B) and then the
variable speed trigger (A). To turn the appliance off, release the variable
speed trigger and the lock-off lever.

WARNING: Never attempt to lock the trigger in the

on position.

Speed Control Switch (Fig. 2)

This string trimmer gives you the choice to operate at a more efficient
speed to extend the runtime for larger jobs, or accelerate the trimmer
speed for high-performance cutting.

WARNING:

Remove the battery before making any
assembly, adjustments, or changing accessories. Such preventive safety
measures reduce the risk of starting the

TRIMMER

accidentally.

CAUTION: Before you begin trimming, only use the

appropriate type of cutting line.

CAUTION: Inspect area to be trimmed and remove

any wire, cord, or string-like objects which could become entangled in
the rotating line or spool. Be particularly careful to avoid any wire which
might be bent outwardly into the path of the appliance, such as barbs
at the base of a chain link fence.

Installing and Removing the Battery Pack
(Fig. 4, 5)

WARNING: Before removing or installing battery,

make certain the lock-off lever is not engaged to prevent trigger
actuation.

To install battery pack: Insert battery pack (J) into battery housing
(I) as shown in Figure 4 until fully seated and an audible click is heard.

FIG. 4

J

I

FIG. 5

K

Make sure battery pack is fully seated and fully latched into position.

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done along sidewalks or other abrasive surfaces or heavier weeds are
being cut.

As you use the trimmer, the string will get shorter due to wear. Gently
bump the trimmer on the ground while running at normal speed and
the line will feed.
NOTE: Extending nylon line beyond the 15 inch (381 mm) swath will
negatively affect performance, runtime, and the life of the trimmer due to
potential of damaging motor. Doing so may void the warranty.

Helpful Cutting Tips

• Use the tip of the string to do the cutting; do not force string head
into uncut grass.

• Wire and picket fences cause extra string wear, even breakage.
Stone and brick walls, curbs, and wood may wear string rapidly.

• Do not allow spool cap to drag on ground or other surfaces.

• In long growth, cut from the top down and do not exceed
12 inches (304.8 mm) high.

• Keep trimmer tilted toward the area being cut; this is the best
cutting area.

• The trimmer cuts when passing the unit from the left to right. This
will avoid throwing debris at the operator.

• Avoid trees and shrubs. Tree bark, wood moldings, siding, and
fence posts can easily be damaged by the string.

Replacement Accessories

WARNING: To reduce the risk of serious

personal injury, turn appliance off and remove battery before
making any adjustments or removing/installing attachments
or accessories.

WARNING: The use of any accessory not recommended

by D

eWALT for use with this appliance could be hazardous.

To extend runtime, push the speed control switch (C) forward toward
the auxillary handle (D) into the "LO" position. This mode is best for
larger projects that require more time to complete.

To accelerate the trimmer, pull the speed control switch back toward
the battery housing (I) into the "HI" position. This mode is best to cut
through heavier growth and for applications that need higher RPM.

NOTE: When in "HI" mode, runtime will be decreased as compared to
when trimmer is in "LO" mode.

Trimming (Fig. 7, 8)

With the trimmer on, angle it and swing side to side as shown in
Figure7.

Maintain a minimum distance of 24 inches (610 mm) between the
guard and your feet as shown in Figure 8.

FIG. 7

Minimum
24 inches

(609.6 mm)

FIG. 8

MINIMUM

24INCHES

(610mm)

WARNING: Keep the rotating string roughly parallel

with the ground (tilted no more than 30 degrees). This trimmer is not
an edger. DO NOT TILT the trimmer so that the string is spinning near
a right angle to the ground. Flying debris can cause serious injury.

Bump Feed Trimmer Line Feed

Your trimmer uses 0.080 inches (2.032 mm) diameter nylon line.
Cutting line will wear faster and require more feeding if the cutting is

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6. Place the end of the cutting line

FIG. 11

(10A) into the retaining hole
(10B).

7. Wind the cutting line onto the
spool in the direction of the
arrow on the bottom of the
spool. Make sure to wind the
line on neatly and in layers. Do
not crisscross (Fig.11).

8. When the wound cutting
line reaches the beginning of
the holding slots (10C), cut the
line approximately 4 inches
(106mm).

9. Push the line in the holding slots on one side of the spool to hold
the first line while you wind the second line.

10. Repeat the above procedure for the second cutting line on the
lower section of the spool.

CAUTION: Before you begin trimming, only use the

appropriate type of cutting line. Ensure that cutting line is present in
both sections of the spool as shown in Figure 11.

11. Once both lines are wrapped around

12A

12B

12C

FIG. 12

the spool (9A), place your thumb and
finger on the holding slots to further
secure the string and feed the end of
each line through the two holes (12A)
on either side of the head in the spool
housing (H) as shown in Figure 12.

1 2. Line up the white nubs (12B) inside

the spool housing with the recesses

WARNING: Do not use any blades, or any accessory

or attachment other than those recommended by D

eWA LT on this

trimmer. Serious injury or product damage may result.

Use DeWALT replacement line Model No. DWO1DT801 or DWO1DT802.

• When replacing the line, use only .080 inches (2.032 mm) diameter
line (MODEL NO. DWO1DT801 OR DWO1DT802) is recommended.
For optimal performance, do not use .095 line. Other sized may
degrade performance and cause damage to the trimmer.

Replacing the Cutting Line (Fig. 2, 9–12)

CAUTION: To avoid appliance damage, if the cutting

line protrudes beyond the trimming blade, cut it off so that it just
reaches the blade.

1. Remove battery.

2. Turn spool (9A) clockwise to unlock as shown in Figure 9. The
white nub (12B) inside the spool will rotate away from the spool
window (9B) to indicate it is unlocked.

9A

9B

FIG. 9

10A

10C

FIG. 10

10B

3. Pull the spool straight out to remove.

4. Remove any dirt and grass from the spool and housing.

5. First, wind new line in the channel of the spool closest to the
holding slots (10C) as shown in Figure 10.

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WARNING: Never use solvents or other harsh

chemicals for cleaning the non-metallic parts of the appliance. These
chemicals may weaken the plastic materials used in these parts. Use a
cloth dampened only with water and mild soap. Never let any liquid get
inside the appliance; never immerse any part of the appliance into a liquid.

CHARGER CLEANING INSTRUCTIONS

WARNING: Shock hazard. Disconnect the charger

from the AC outlet before cleaning. Dirt and grease may be removed
from the exterior of the charger using a cloth or soft non-metallic
brush. Do not use water or any cleaning solutions.

Replacing Spool Housing

(Fig. 14–15)

1. Rotate the spool housing (H) until the hole (14A) in the spindle (14B)
lines up with notch (14C) in the guard (G). A third hole in the motor
housing (14D) will be visible as shown in Figure 14. Insert screwdriver
through each all three holes to prevent the spool housing from turning.

2. Turn the spool housing clockwise as shown in Figure 15.

3. Insert a screwdriver back through the three holes (14A, 14C, and
14D) and thread the new spool housing counterclockwise and
securely tighten onto the bolt (15A) protruding from the trimmer.

14A

14D

14B

14C

H

G

FIG. 14

FIG. 15

15A

(12C) of the spool. Align the holding slots (10C) with the two holes
(12A) as close as possible.

13. Push the spool into the spool housing and turn counterclockwise
to lock the spool in place. Ensure the white nub (12B) appears in
the spool window (9B). Make sure the line doesn't unravel and
wrap around the shaft below the spool.

14. Pull both ends of the cutting line to release them from the
holding slots. If the line extends past the cutting blade on the
guard cut the line so it just reaches the blade.

MAINTENANCE

WARNING: To reduce the risk of serious

personal injury, turn appliance off and remove battery before
making any adjustments or removing/installing attachments
or accessories.

1. Keep the air intake slots (13A) clean

13A

FIG. 13

to avoid overheating.

2. Your trimmer line can dry out over
time. To keep your line in top condition,
store spare line in a plastic, sealable
bag with a tablespoon of water.

3. Plastic parts may be cleaned by
using a mild soap and a damp rag.

4. The line cutter on the edge of the guard can dull over time. It is
recommended you periodically touch-up the sharpness of the
blade with a file.

Cleaning

WARNING: Blow dirt and dust out of all air vents

with clean, dry air at least once a week. To minimize the risk of
eye injury, always wear ANSI Z87.1 approved eye protection when
performing this.

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Accessories

WARNING: Since accessories, other than those

offered by D

eWALT, have not been tested with this product, use of

such accessories with this appliance could be hazardous. To reduce
the risk of injury, only D

eWALT recommended accessories should be

used with this product.

Recommended accessories for use with your appliance are available
at extra cost from your local service center. If you need any assistance
in locating any accessory, please contact D

eWALT Industrial Tool Co.,

701 East Joppa Road, Towson, MD 21286, call 1-800-4-D

eWALT

(1-800-433-9258) or visit our website: www.dewalt.com.

Repairs

The charger and battery pack are not serviceable. There are no
serviceable parts inside the charger or battery pack.
To assure product SAFn ETY and RELIABILITY, repairs, maintenance
and adjustments (including brush inspection and replacement) should
be performed by a D

eWA LT factory service center, a DeWALT

authorized service center or other qualified service personnel. Always
use identical replacement parts.

Register Online

Thank you for your purchase. Register your product now for:

• WARRANTY SERVICE: Registering your product will help you

obtain more efficient warranty service in case there is a problem
with your product.

• CONFIRMATION OF OWNERSHIP: In case of an insurance

loss, such as fire, flood or theft, your registration of ownership will
serve as your proof of purchase.

• FOR YOUR SAFETY: Registering your product will allow us to

contact you in the unlikely event a safety notification is required
under the Federal Consumer Safety Act.

Register online at www.dewalt.com/register.

Replacing Guard

(Fig. 16–17)

WARNING: Never operate appliance without guard

firmly in place.

1. Remove the spool housing as described in the "Replacing Spool
Housing" section.

2. Remove the 4 guard screws (16A) shown in Figure 16.

3. Lift the guard off at an angle as shown in Figure 17.

16A

16A

FIG. 16

FIG. 17

FIG. 18

18A

18B

4. To attached a new guard, slide the

tab (18A) of the new guard under the

lip (18B) of the motor housing (E),
then lower the back of the guard into
place as shown in Figure 18.

5. Replace and securely tighten the 4
guard screws (16A).

6. Replace the spool housing as
described in the "Replacing Spool
Housing" section.

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Three Year Limited Warranty

DeWA LT will repair, without charge, any defects due to faulty materials
or workmanship for three years from the date of purchase. This
warranty does not cover part failure due to normal wear or appliance
abuse. For further detail of warranty coverage and warranty repair
information, visit www.dewalt.com or call 1-800-4-D

eWALT (1-800-

433-9258). This warranty does not apply to accessories or damage
caused where repairs have been made or attempted by others. This
warranty gives you specific legal rights and you may have other rights
which vary in certain states or provinces.

In addition to the warranty, D

eWA LT appliances are covered by our:

1 YEAR FREE SERVICE

D

eWA LT will maintain the appliance and replace worn parts caused

by normal use, for free, any time during the first year after purchase.

D

eWALT BATTERY PACKS

Product warranty voided if the battery pack is tampered with in any
way. D

eWA LT is not responsible for any injury caused by tampering and

may prosecute warranty fraud to the fullest extent permitted by law.

90 DAY MONEY BACK GUARANTEE

If you are not completely satisfied with the performance of your
D

eWA LT Power Tool, Laser, or Nailer for any reason, you can return it

within 90 days from the date of purchase with a receipt for a full refund
– no questions asked.

LATIN AMERICA: This warranty does not apply to products sold
in Latin America. For products sold in Latin America, see country
specific warranty information contained in the packaging, call the local
company or see website for warranty information.

FREE WARNING LABEL REPLACEMENT:
If your warning labels become illegible or are missing, call
1-800-4-D

eWALT (1-800-433-9258) for a free replacement.

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TROUBLESHOOTING

Problem Solution

Unit will not start. • Check battery installation.

• Check battery charging requirements.

• Check that lock off is fully pulled back prior to moving main trigger.

Unit shuts down in use. • Charge battery.

• Clear debris around spool.

• Reduce/limit swath to 15 inches (381mm) MAX.

• Reinstall guard if it has been removed.

Battery won’t charge. • Insert battery into charger until red charging light illuminates. Charge up to 8 hours if battery is

totally drained.

•

Plug charger into a working outlet. Refer to

Important Charging Notes

for more details.

• Check current at receptacle by plugging an appliance.

• Check to see if receptacle is connected to a light switch which turns power off when you turn
out the lights.

• Move charger and appliance to a surrounding air temperature of above 40°F (4.5°C) or below
105°F (40.5°C).

Appliance runs slowly. • Fully depress the variable speed trigger. The level of trigger depression affects speed.

• If appliance still runs slowly, remove battery from appliance.

• Check that the spool housing can rotate freely. Carefully clean it if necessary.

• Check that the cutting line does not protrude more than approximately 4-13/16" (122 MM) from
the spool. If it does, cut it off so that it just reaches the line trimming blade.

Trimmer is vibrating. • Make sure both cutting lines are the same length.

• Check to see if the spool is properly wound. If spool is broken then replace spool.