DeWalt DCST920 Instruction Manual

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1-800-4-DeWALT

Instruction Manual

Guide D’utilisation

Manual de instrucciones

DCST920

20V Max* Lithium String Trimmer Taille-bordureau lithium-ion de 20V max.* Podadora de cuerda con batería de iones de litio de 20V Máx*

final page size: 8.5 x 5.5 in

ENGLISH

English (original instructions) 1

Français (traduction de la notice d’instructions originale) 13

Español (traducido de las instrucciones originales) 26

ENGLISH

DeWALT

Definitions: Safety Alert Symbols and Words

This instruction manual uses the following safety alert symbols and words to alert you to hazardous situations and your risk of personal injury or propertydamage.

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.

(Used without word) Indicates a safety relatedmessage.



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

propertydamage.

Fig. A

Variable speed trigger

Lock-off lever

Speed control switch

Auxiliary handle

Motor housing

Upper trimmer pole

Lower trimmer pole

Pole bracket

Guard

Spool housing

Battery housing

Battery pack

Battery release button

Handle

WARNING! Read all safety warnings



and all instructions. Failure to follow the warnings and instructions may result in electric shock, fire and/ or seriousinjury.

WARNING: To reduce the risk of injury,

read the instructionmanual.

If you have any questions or comments about this or any 1-800-4-

tool, call us toll free at:

(1-800-433-9258).

ENGLISH

DeWALT

Important Safety Warnings

WARNING: To reduce risk of injury:



• Before any use, be sure everyone using this unit reads and understands all safety instructions and other information contained in this manual.

• Save these instructions and reviewfrequently.

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

1 . Avoid Dangerous Environments – DO NOT use

appliances in damp or wet locations. DO NOT operate portable electric appliances in gaseous or explosive atmospheres. Motors in these appliances normally spark, and the sparks might ignitefumes.

2 . Don’t Use InRain. 3 . Keep All Bystanders Away – at a safe distance from

work area, especiallychildren.

4 . 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. Wear protective hair covering to contain longhair.

5 . Always Wear Eye Protection – Wear ANSI Z87.1

approved eye protection at all times when battery is installed. Also use face or dust mask. Safety glasses are available at extra cost at your local or authorized service facility.

6 . Use Right Appliance – Do not use appliance for any job

except that for which it isintended.

7 . Avoid Accidentally Starting – Don’t carry with finger

ontrigger when battery isinstalled.

8 . 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.

9 . Don’t Overreach – Keep proper footing and balance at

alltimes.

10 . Stay Alert – Watch what you are doing. Use common

sense. DO NOT operate while under the influence of alcohol or drugs, or when you are tired or ill.

11 . Disconnect Appliance – Remove the battery when not in

use, before servicing, when changing accessories such as blades, and thelike.

12 . Store Idle Appliances Indoors – When not in use,

appliances should be stored indoors in dry, and high or locked-up place – out of reach ofchildren.

13 . Maintain Appliance With Care – 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

Service Center

if damaged. Keep handles dry, clean, and free from oil andgrease.

14 . 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 indicated elsewhere in thismanual.

15 . Damage to Unit – If you strike or become entangled

with a foreign object, stop appliance immediately, remove battery, check for damage and have any damage repaired before further operation isattempted.

16 . Guard – Do not use this appliance without guard

attached. Keep guards in place and in workingorder.

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

hose. DO NOT allow any liquid to get inside it. If appliance does get wet, allow to dry for a minimum of 48hours.

18 . DO NOT store the appliance on or adjacent to fertilizers

orchemicals.

19 . DO NOT clean with a pressurewasher. 20 . DO NOT charge appliance in rain, or in wetlocations.

Specific Warnings for String Trimmers

WARNING: This product is not an edger



and is not intended to be used foredging.

• Don’t operate the appliance when barefoot or wearing open sandals.

• Wear heavy long pants to protect yourlegs.

• MAKE SURE that other persons and pets are at least 100 feet (30m)away.

• 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.

• 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.

Additional Safety Warnings

CAUTION: Use only



spools and line. Using any other manufacturer's line can reduce performance, damage the trimmer or cause personalinjury. Your trimmer uses 0.080 inches (2.032 mm) diameter line. Do not use other size lines. This can degrade performance, cause damage to the unit orinjury.

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.

replacement

WARNING: Some dust created by

DeWALT



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.

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

V ......................... volts

Hz ....................... hertz

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

or DC ......direct current

...................... Class I Construction

(grounded)

…/min .............. per minute

BPM .................... beats per minute

IPM ..................... impacts per minute

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

minute

sfpm ................... surface feet per

minute

SPM .................... strokes per minute

A ......................... amperes

W ........................ watts

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

or AC/DC .... alternating or

direct current

...................... Class II

Construction

(double insulated)

no ....................... no load speed

n ......................... rated speed

...................... earthing terminal

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

..................... visible radiation

..................... wear respiratory

protection

..................... wear eye

protection

..................... wear hearing

protection

..................... read all

documentation

• 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

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

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

• Do not incinerate the battery pack even if it is

• If battery contents come into contact with the skin,

• Contents of opened battery cells may cause

chargers.

locations where the temperature may reach or exceed 104°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 tool with the trigger switch locked on. Never tape the trigger switch in the ONposition.

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.

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.

respiratory irritation. Provide fresh air. If symptoms persist, seek medicalattention.

ENGLISH

BATTERIES AND CHARGERS

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. When ordering replacement battery packs, be sure to include the catalog number andvoltage.

Your tool uses a instructions before using your charger. Consult the chart at the end of this manual for compatibility of chargers and batterypacks.

READ ALL INSTRUCTIONS

charger. Be sure to read all safety

Important Safety Instructions for All Battery Packs

WARNING: Read all safety warnings



and all instructions for the battery pack, charger and power tool. Failure to follow the warnings and instructions may result in electric shock, fire and/or seriousinjury.

WARNING: Burn hazard. Battery liquid



may be flammable if exposed to spark orflame.

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 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.

Transportation

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, tool 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

ENGLISH

DeWALT

conductive materials such as keys, coins, hand tools and the like. The US Department of

Transportation Hazardous Material Regulations (HMR) actually prohibit transporting batteries in commerce or on airplanes in carry-on baggage 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.

Shipping the

The DeWALT FLEXVOLT™ battery has two modes:

Use and Shipping. Use Mode: When the FLEXVOLT™ battery stands alone or is

in a DeWALT 20V Max* product, it will operate as a 20V Max* battery. When the FLEXVOLT™ battery is in a 60V Max* or a 120V Max* (two 60V Max* batteries) product, it will operate as a 60V Max* battery.

Shipping Mode: When the cap is attached to the FLEXVOLT™ battery, the battery is in Shipping Mode. Strings of cells are electrically disconnected within the pack resulting in three batteries with a lower Watt hour (Wh) rating as compared to one battery with a higher Watt hour rating. This increased quantity of three batteries with the lower Watt hour rating can exempt the pack from certain shipping regulations that are imposed upon the higher Watt hourbatteries.

The battery label indicates two Watt hour ratings (see example). Depending on how the battery is shipped, the appropriate Watt hour rating must be used to determine the applicable shipping requirements. If utilizing the shipping cap, the pack will be considered 3 batteries at the Watt hour rating indicated for “Shipping”. If shipping without the cap or in a tool, the pack will be considered one battery at the Watt hour rating indicated next to “Use”.

Example of Use and Shipping Label Marking

For example, Shipping Wh rating might indicate 3 x 40 Wh, meaning 3 batteries of 40 Watt hours each. The Use Wh rating might indicate 120 Wh (1 batteryimplied).

FLEXVOLT™ Battery

USE: 120 Wh Shipping: 3 x 40 Wh

Fuel Gauge Battery Packs (Fig. B)

Some consists of three green LED lights that indicate the level of charge remaining in the batterypack.

The fuel gauge is an indication of approximate levels of charge remaining in the battery pack according to the followingindicators:

battery packs include a fuel gauge which

75–100% charged

51–74% charged

< 50% charged

Pack needs to be charged

To actuate the fuel gauge, press and hold the fuel gauge button. 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 tool 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 1-800-4website www.dewalt.com.

Fig. B

(1-800-433-9258) or visit our

The RBRC® Seal

The RBRC® (Rechargeable Battery Recycling Corporation) Seal on the nickel cadmium, nickel metal hydride or lithiumion batteries (or battery packs) indicates that the costs to recycle these batteries (or battery packs) at the end of their useful life have already been paid by spent nickel cadmium, nickel metal hydride or lithium-ion batteries in the trash or municipal solid waste stream and the Call2Recycle® program provides an environmentally consciousalternative.

Call 2 Recycle, Inc., in cooperation with battery users, has established the program 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 hydride or lithium-ion batteries to an authorized 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 Call 2 Recycle,Inc.

. In some areas, it is illegal to place

and other

service

Important Safety Instructions for All Battery Chargers

WARNING: Read all safety warnings



and all instructions for the battery pack, charger and power tool. Failure to follow the warnings and instructions may result in electric shock, fire and/or seriousinjury.

• DO NOT attempt to charge the battery pack with

DeWALT

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

Any other uses may result in risk of fire, electric shock orelectrocution.

• 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

Volts

120 V 25 (7.6) 50 (15.2) 100 (30.5) 150 (45.7) 240 V 50 (15.2) 100 (30.5) 200 (61.0) 300 (91.4)

Ampere Rating

Not

Than

More Than

0 6 18 16 16 14

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

• 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.

rechargeable batteries.

Total Length of Cord in Feet

(meters)

American Wire Gauge

ENGLISH

• 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. This does not apply to the

vehicularcharger.

WARNING:Shock hazard. Do not 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.

CAUTION: Burn hazard. To reduce the risk



of injury, charge only 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.

rechargeable battery

Charging a Battery (Fig. C)

1. Plug the charger into an appropriate outlet before inserting batterypack.

Fig. C

ENGLISH

2. Insert the battery pack the battery pack is fully seated in the charger. The red (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 battery pack is fully charged and may be used at this time or left in the charger. To remove the battery pack from the charger, push the battery release button

NOTE: To ensure maximum performance and life of lithiumion battery packs, charge the battery pack fully before firstuse.

13

into the charger, making sure

12

on the batterypack.

Charger Operation

Refer to the indicators below for the charge status of the batterypack.

DCB107, DCB112, DCB113, DCB115, DCB118, DCB132

Charging

Fully Charged

Hot/Cold Pack Delay*

* DCB107, DCB112, DCB113, DCB115, DCB118, DCB132:

The red light will continue to blink, but a yellow indicator light will be illuminated during this operation. Once the battery pack has reached an appropriate temperature, the yellow light will turn off and the charger will resume the chargingprocedure.

The compatible charger(s) will not charge a faulty battery pack. The charger will indicate faulty battery pack by refusing to light or by displaying a problem pack or charger blinkpattern.

NOTE: This could also mean a problem with acharger. If the charger indicates a problem, take the charger and

battery pack to be tested at an authorized servicecenter.

Hot/Cold Pack Delay

When the charger detects a battery pack that is too hot or too cold, it automatically starts a Hot/Cold Pack Delay, suspending charging until the battery pack has reached an appropriate temperature. The charger then automatically switches to the pack charging mode. This feature ensures maximum battery packlife.

A cold battery pack will charge at a slower rate than 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.

The DCB118 charger is equipped with an internal fan designed to cool the battery pack. The fan will turn on automatically when the battery pack needs to becooled.

Never operate the charger if the fan does not operate properly or if ventilation slots are blocked. Do not permit foreign objects to enter the interior of thecharger.

Electronic Protection System

Li-Ion tools are designed with an Electronic Protection System that will protect the battery pack against overloading, overheating or deepdischarge.

The tool will automatically turn off if the Electronic Protection System engages. If this occurs, place the lithiumion battery pack on the charger until it is fullycharged.

Wall Mounting

DCB107, DCB112, DCB113, DCB115, DCB118, DCB132

These chargers are designed to be wall mountable or to sit upright on a table or work surface. If wall mounting, locate the charger within reach of an electrical outlet, and away from a corner or other obstructions which may impede air flow. Use the back of the charger as a template for the location of the mounting screws on the wall. Mount the charger securely using drywall screws (purchased separately) at least 1" (25.4 mm) long, with a screw head diameter of 0.28–0.35" (7–9mm), screwed into wood to an optimal depth leaving approximately 7/32" (5.5 mm) of the screw exposed. Align the slots on the back of the charger with the exposed screws and fully engage them in theslots.

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.

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 +104°F (+40°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. 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);

d. If charging problems persist, take the tool, battery

pack and charger to your local servicecenter.

4. 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.

5. 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.

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

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 FOR

FUTURE USE

ENGLISH

Fig. E

Attaching the Auxiliary Handle (Fig. A, F)

1. Slide the auxiliary handle handle base

2. Hold the auxiliary handle in place and thread the handle bolt handlebase.

3. Tighten the handle bolt with the supplied hex wrench

18

4. Repeat for the other side of the auxiliaryhandle.

19

20

. Ensure the handle is securelyattached.

Fig. F

into the handle from the bottom of the

into the top hole of the

COMPONENTS (FIG. A)

WARNING: Never modify the power



tool or any part of it. Damage or personal injury couldresult.

Refer to Figure A at the beginning of this manual for a complete list ofcomponents.

Intended Use

This string trimmers is designed for professional trimming applications. This product is not an edger and is not intended to be used foredging.

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tool.

ASSEMBLY (FIG. A, D, E) Assembling the Pole

1. To assemble the pole, line up the upper trimmer pole

6

and the lower trimmer pole Press down the latching button pole into the lower pole. Ensure the latching button engages the latch hole

2. Secure the poles by tightening the middle bolt the supplied hex wrench

Fig. D

15 16

7

as shown in Figure A.

15

and slide the upper

16

18

as shown in FigureE.

17

with

Adjustment (Fig. G)

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 OPERATE



APPLIANCE WITHOUT GUARD FIRMLY IN PLACE. The guard must always be properly attached on the appliance to protect theuser.

The auxiliary handle However, if adjustment is necessary, loosen the four bolts

with a hex wrench

up or down the upper trimmer pole

4

is positioned to maximize balance.

18

and slide the auxiliary handle

6

4

ENGLISH

Fig.G

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.

Fig. H

Fig. I

Proper Hand Position (Fig. J)

WARNING: Always use proper eye



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

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. H, I)

WARNING: Make certain the lock-off



lever is not engaged to prevent switch actuation before removing or installingbattery.

NOTE: For best results, make sure your battery pack is fullycharged.

To install the battery pack: Align the battery pack with the rails inside the battery housing and slide it into the housing until the battery pack is firmly seated and ensure that it does notdisengage.

To remove battery pack: Depress the release button and firmly pull the battery pack out of the battery housing. Insert it into the charger as described in the charger section of thismanual.

12

13

WARNING: To reduce the risk of serious



personal injury, ALWAYS use proper hand position as shown.

WARNING: To reduce the risk of serious



personal injury, ALWAYS hold securely in anticipation of a suddenreaction.

Proper hand position requires one hand on the primary

14

handle

and one hand on the auxiliary handle

Fig. J

Switching Trimmer On and Off (Fig. A)

To turn the appliance on, squeeze the lock-off lever then the variable speed trigger off, release the variable speed trigger and the lock-offlever.

WARNING: Never attempt to lock the



trigger in the onposition.

1

. To turn the appliance

Speed Control Switch (Fig. A)

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 highperformancecutting.

To extend runtime, push the speed control switch forward toward the auxillary handle position. This mode is best for larger projects that require more time tocomplete.

4

into the "LO"

4

2

and

3

To accelerate the trimmer, pull the speed control switch

DeWALT

back toward the battery housing 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.

11

into the "HI" position.

Trimming (Fig. K, L)

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

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

Fig. K

Fig. L

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 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 13inch (330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.

ENGLISH

• 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 could behazardous.

WARNING: Do not use any blades,



or any accessory or attachment other than those recommended by injury or product damage mayresult.

Use orDWO1DT802.

When replacing the line, use only .080 inches (2.032 mm) diameter line (Model No. DWO1DT801 or DWO1DT802 are is recommended). Other sizes may degrade performance or cause damage to thetrimmer.

replacement line Model No. DWO1DT801

for use with this appliance

on this trimmer. Serious

Reloading the Cutting Line (Fig. A, M, N)

WARNING: To reduce the risk of



serious personal injury, turn unit off and remove the battery pack. An accidental start-up can

causeinjury.

CAUTION: Use only



CAUTION: To avoid appliance damage, if



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

Use only

1. Removebattery.

replacementline.

replacement

ENGLISH

DeWALT

2. Cut a max of 25 feet (8 m) length of trimmerline.

3. Align spool housing eyelets the spool head

4. Thread one end of the trimmer line through an eyelet. Guide the line through to the second eyelet and continue to pull the line through until there are equal lengths of string on each side of the spool housing as shown in FigureM.

5. Secure the spool cap Using your other hand, wind the string onto the spool by rotating the spool head shown in Figure N. Continue winding until 5 inches (127mm) of string remain on each side of the spool housing

Fig. M

24

22

as shown in FigureM.

with the arrow

25

from moving with one hand.

24

counter clockwise as

23

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.

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.

Accessories

Fig.N

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 (Fig.O).

Fig. O

26

clean to avoid overheating

WARNING: Since accessories, other than



those offered by this product, use of such accessories with this tool could be hazardous. To reduce the risk of injury, only

Recommended accessories for use with your tool are available at extra cost from your local dealer or authorized service center. If you need assistance in locating any accessory, please contact (1-800-433-9258).

recommended accessories should be used

with thisproduct.

have not been tested with

, call 1-800-4-

Replacement Accessories

Replacing Spool Assembly (Fig.A, P, Q)

25

10

until the hole

28

1. Rotate the spool housing spindle plate aligns with notch a screwdriver through the notch and into the hole, to prevent the spindle fromturning.

2. Unscrew and remove the spool housing by turning the spool head

3. NOTE: Do not try to remove the spool housing by

turning the spool cap

24

clockwise.

27

in the guard. Insert

in the

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.

Fig. P

DeWALT

ENGLISH

Fig. R

4. Remove spindle plate housing. Remove any dirt and grass from the motor housing and spindleplate.

5. Install spindle plate double D shaped retaining nut inside the base of the spindleplate.

6. Align the spindle plate hole and notch, insert a screwdriver back into the hole and thread the new spool housing counterclockwise. Securely tighten the new spool housing onto the spindle

Fig. Q

before installing a new

onto the spindle

on the spindle sits

29

, so the

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

4. To attached a new guard, slide the tab

5. Replace and securely tighten the 4 guard screws

6. Replace the spool housing as described in the

Fig. S

guard under the lip lower the back of the guard into place as shown in FigureT.

Fig. T

Replacing Spool Housingsection.

of the motor housing

of the new

, then

32

Repairs

The charger and battery pack are notserviceable.

Replacing Guard (Fig. R, S, T)

An extended coverage guard is available (sold separately) for extra coverage if desired. Use guard Part NumberN496261.

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

replacement

shown in FigureR.

WARNING: To assure product



SAFETY and RELIABILITY, repairs, maintenance and adjustment (including brush inspection and replacement, when applicable) should be performed by a authorized service center. Always use identical replacementparts.

factory service center or a

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.

ENGLISH

DeWALT

• 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.

Three Year Limited Warranty

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 tool abuse. For further detail of warranty coverage and warranty repair information, visit www.dewalt.com or call 1-800-4433-9258). This warranty does not apply to accessories or damage caused where repairs have been made or attempted by others. THIS LIMITED WARRANTY IS GIVEN IN LIEU OF ALL OTHERS, INCLUDING THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND EXCLUDES ALL INCIDENTAL OR CONSEQUENTIAL DAMAGES. Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages, so these limitations may not apply to you. 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, byour:

will maintain the tool and replace worn parts caused by normal use, for free, any time during the first year afterpurchase.

2 YEARS FREE SERVICE ON DEWALT BATTERY PACKS

DC9071, DC9091, DC9096, DC9182, DC9280, DC9360, DCB120,

DCB127, DCB201, DCB203, DCB203BT, DCB207, DCB361

3 YEARS FREE SERVICE ON DEWALT BATTERY PACKS

DCB200, DCB204, DCB204BT, DCB205, DCB205BT, DCB206,

NOTE: Battery warranty voided if the battery pack is tampered with in any way. for any injury caused by tampering and may prosecute warranty fraud to the fullest extent permitted bylaw.

If you are not completely satisfied with the performance of your 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(1-800-433-9258) for a freereplacement.

1 YEAR FREE SERVICE

90 DAY MONEY BACK GUARANTEE

Power Tool, Laser, or Nailer for any reason, you

tools are covered

DCB606, DCB609

is not responsible

(1-800-

+ 30 hidden pages

DeWalt DCST920 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual