DeWalt DCF840NT User manual

DCF840

B
Copyright DeWALT
English (original instructions) 3
Pусский (перевод соригинала инструкции) 13
Українська (переклад з оригінальної інструкції) 30

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Fig. A
Fig. B
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9
10
5
6
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Fig. DFig. C
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ENGLISH
English (original instructions)
BRUSHLESS CORDLESS COMPACT IMPACT DRIVER
DCF840
Congratulations!
You have chosen a DeWALT tool. Years of experience, thorough
product development and innovation make DeWALT one of the
most reliable partners for professional power toolusers.
Technical Data
DCF840
Voltage VDC 18
Type 1
Battery type Li-Ion
Power output W380
No load speed min-1 0–3200
Impact rate min-1 0–4200
Max. torque Nm 192
Tool holder 6.35 mm
Weight (without battery pack) kg 0.88
Noise values and/or vibration values (triax vector sum) according to
EN62841-2-2:
LPA (emission sound pressure level) dB(A) 91
LWA (sound power level) dB(A) 102
K (uncertainty for the given sound level) dB(A) 3
Vibration emission value a
h
= m/s216.5
Uncertainty K = m/s21.7
The vibration and/or noise emission level given in this
information sheet has been measured in accordance with
a standardised test given in EN62841 and may be used to
compare one tool with another. It may be used for a preliminary
assessment ofexposure.
WARNING:The declared vibration and/or noise emission
level represents impact tightening of fasteners of the
maximum capapcity of the tool. However if the tool is
used for different applications, with different accessories
or poorly maintained, the vibration and/or noise emission
may differ. This may significantly increase the exposure
level over the total workingperiod.
An estimation of the level of exposure to vibration and/
or noise should also take into account the times when the
tool is switched off or when it is running but not actually
doing the job. This may significantly reduce the exposure
level over the total workingperiod.
Identify additional safety measures to protect the
operator from the effects of vibration and/or noise such
as: maintain the tool and the accessories, keep the
hands warm (relevant for vibration), organisation of
workpatterns.
EC-Declaration of Conformity
Machinery Directive
Brushless Cordless Compact Impact Driver
DCF840
DeWALT declares that these products described under
Technical Data are in compliance with:
2006/42/EC, EN62841-1:2015, EN62841-2-2:2014.
These products also comply with Directive 2014/30/EU and
2011/65/EU. For more information, please contact DeWALT at
the following address or refer to the back of themanual.
The undersigned is responsible for compilation of the technical
file and makes this declaration on behalf ofDeWALT.
Markus Rompel
Vice President of Engineering, PTE-Europe
DeWALT, Richard-Klinger-Straße 11,
65510, Idstein, Germany
19.05.2021
DECLARATION OF CONFORMITY
THE SUPPLY OF MACHINERY (SAFETY)
REGULATIONS 2008
Brushless Cordless Compact Impact Driver
DCF840
DeWALT declares that these products described under
“technical data” are in compliance with:
EN62841-1:2015, EN62841-2-2:2014
These products conform to the following UK Regulations
The Supply of Machinery (Safety) Regulations, 2008, S.I.
2008/1597 (as amended).
Electromagnetic Compatibility Regulations, 2016, S.I.2016/1091
(as amended).
The Restriction of the Use of Certain Hazardous Substances
in Electrical and Electronic Equipment Regulations 2012, S.I.
2012/3032 (as amended).
For more information, please contact DeWALT at the following
address or refer to the back of the manual.

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ENGLISH
The undersigned is responsible for compilation of the technical
file and makes this declaration on behalf of DeWALT.
Karl Evans
Vice President Professional Power Tools EANZ GTS
270 Bath Road, Slough
SL1 4DX
England
19.05.2021
WARNING: To reduce the risk of injury, read the
instructionmanual.
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.
Denotes risk of electricshock.
Denotes risk offire.
GENERAL POWER TOOL SAFETY WARNINGS
WARNING: Read all safety warnings, instructions,
illustrations and specifications provided with this
power tool. Failure to follow all instructions listed below
may result in electric shock, fire and/or serious injury.
SAVE ALL WARNINGS AND INSTRUCTIONS
FOR FUTURE REFERENCE.
The term “power tool” in the warnings refers to your mains-
operated (corded) power tool or battery-operated (cordless)
powertool.
1) Work Area Safety
a ) Keep work area clean and well lit. Cluttered or dark
areas inviteaccidents.
b ) Do not operate power tools in explosive
atmospheres, such as in the presence of flammable
liquids, gases or dust. Power tools create sparks which
may ignite the dust orfumes.
c ) Keep children and bystanders away while operating
a power tool. Distractions can cause you to losecontrol.
2) Electrical Safety
a ) Power tool plugs must match the outlet. Never
modify the plug in any way. Do not use any adapter
plugs with earthed (grounded) power tools.
Unmodified plugs and matching outlets will reduce risk of
electricshock.
b ) Avoid body contact with earthed or grounded
surfaces such as pipes, radiators, ranges and
refrigerators. There is an increased risk of electric shock if
your body is earthed orgrounded.
c ) Do not expose power tools to rain or wet conditions.
Water entering a power tool will increase the risk of
electricshock.
d ) Do not abuse the cord. Never use the cord for
carrying, pulling or unplugging the power tool. Keep
cord away from heat, oil, sharp edges or moving
parts. Damaged or entangled cords increase the risk of
electricshock.
e ) When operating a power tool outdoors, use an
extension cord suitable for outdoor use. Use of a cord
suitable for outdoor use reduces the risk of electricshock.
f ) If operating a power tool in a damp location is
unavoidable, use a residual current device (RCD)
protected supply. Use of an RCD reduces the risk of
electricshock.
Batteries Chargers/Charge Times (Minutes)
Cat # VDC Ah Weight (kg) DCB104 DCB107 DCB112 DCB113 DCB115 DCB116 DCB117 DCB118 DCB132 DCB119
DCB181 18 1.5 0.35 22 70 45 35 22 22 22 22 22 45
DCB182 18 4.0 0.61 60/40** 185 120 100 60 60/45** 60/40** 60/40** 60 120
DCB183/B/G 18 2.0 0.40 30 90 60 50 30 30 30 30 30 60
DCB184/B/G 18 5.0 0.62 75/50** 240 150 120 75 75/60** 75/50** 75/50** 75 150
DCB185 18 1.3 0.35 22 60 40 30 22 22 22 22 22 40
DCB187 18 3.0 0.54 45 140 90 70 45 45 45 45 45 90
DCB189 18 4.0 0.54 60 185 120 100 60 60 60 60 60 120
*Date code 201811475B or later
**Date code 201536 or later
Batteries
Chargers/Charge Times (Minutes)
Cat #
DC
Weight
*Date code 201811475B or later
**Date code 201536 or later

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3) Personal Safety
a ) Stay alert, watch what you are doing and use
common sense when operating a power tool. Do not
use a power tool while you are tired or under the
influence of drugs, alcohol or medication. A moment
of inattention while operating power tools may result in
serious personalinjury.
b ) Use personal protective equipment. Always wear eye
protection. Protective equipment such as a dust mask,
non-skid safety shoes, hard hat or hearing protection used
for appropriate conditions will reduce personalinjuries.
c ) Prevent unintentional starting. Ensure the switch
is in the off-position before connecting to power
source and/or battery pack, picking up or carrying
the tool. Carrying power tools with your finger on the
switch or energising power tools that have the switch on
invitesaccidents.
d ) Remove any adjusting key or wrench before turning
the power tool on. A wrench or a key left attached
to a rotating part of the power tool may result in
personalinjury.
e ) Do not overreach. Keep proper footing and balance
at all times. This enables better control of the power tool
in unexpectedsituations.
f ) Dress properly. Do not wear loose clothing or
jewellery. Keep your hair and clothing away from
moving parts. Loose clothes, jewellery or long hair can be
caught in movingparts.
g ) If devices are provided for the connection of dust
extraction and collection facilities, ensure these are
connected and properly used. Use of dust collection
can reduce dust-relatedhazards.
h ) Do not let familiarity gained from frequent use of
tools allow you to become complacent and ignore
tool safety principles. A careless action can cause severe
injury within a fraction of asecond.
4) Power Tool Use and Care
a ) Do not force the power tool. Use the correct power
tool for your application. The correct power tool
will do the job better and safer at the rate for which it
wasdesigned.
b ) Do not use the power tool if the switch does not turn
it on and off. Any power tool that cannot be controlled
with the switch is dangerous and must berepaired.
c ) Disconnect the plug from the power source and/
or remove the battery pack, if detachable, from
the power tool before making any adjustments,
changing accessories, or storing power tools. Such
preventive safety measures reduce the risk of starting the
power toolaccidentally.
d ) Store idle power tools out of the reach of children
and do not allow persons unfamiliar with the power
tool or these instructions to operate the power tool.
Power tools are dangerous in the hands of untrainedusers.
e ) Maintain power tools and accessories. Check for
misalignment or binding of moving parts, breakage
of parts and any other condition that may affect the
power tool’s operation. If damaged, have the power
tool repaired before use. Many accidents are caused by
poorly maintained powertools.
f ) Keep cutting tools sharp and clean. Properly
maintained cutting tools with sharp cutting edges are less
likely to bind and are easier tocontrol.
g ) Use the power tool, accessories and tool bits, etc.
in accordance with these instructions, taking into
account the working conditions and the work to be
performed. Use of the power tool for operations different
from those intended could result in a hazardoussituation.
h ) Keep handles and grasping surfaces dry, clean and
free from oil and grease. Slippery handles and grasping
surfaces do not allow for safe handling and control of the
tool in unexpectedsituations.
5) Battery Tool Use and Care
a ) Recharge only with the charger specified by the
manufacturer. A charger that is suitable for one type
of battery pack may create a risk of fire when used with
another batterypack.
b ) Use power tools only with specifically designated
battery packs. Use of any other battery packs may create
a risk of injury andfire.
c ) When battery pack is not in use, keep it away from
other metal objects, like paper clips, coins, keys,
nails, screws or other small metal objects, that can
make a connection from one terminal to another.
Shorting the battery terminals together may cause burns
or afire.
d ) Under abusive conditions, liquid may be ejected
from the battery; avoid contact. If contact
accidentally occurs, flush with water. If liquid
contacts eyes, additionally seek medical help. Liquid
ejected from the battery may cause irritation orburns.
e ) Do not use a battery pack or tool that is damaged or
modified. Damaged or modified batteries may exhibit
unpredictable behaviour resulting in fire, explosion or risk
of injury.
f ) Do not expose a battery pack or tool to fire or
excessive temperature. Exposure to fire or temperature
above 130 °C may causeexplosion.
g ) Follow all charging instructions and do not charge
the battery pack or tool outside the temperature
range specified in the instructions. Charging
improperly or at temperatures outside the specified range
may damage the battery and increase the risk of fire.
6) Service
a ) Have your power tool serviced by a qualified repair
person using only identical replacement parts. This
will ensure that the safety of the power tool is maintained.
b ) Never service damaged battery packs. Service
of battery packs should only be performed by the
manufacturer or authorized service providers.

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Additional Specific Safety Rules for Impact
Drivers
• Hold power tool by insulated gripping surfaces when
performing an operation where the fastener may
contact hidden wiring. Fasteners contacting a “live” wire
may make exposed metal parts of the power tool “live” and
could give the operator an electricshock.
Residual Risks
In spite of the application of the relevant safety regulations
and the implementation of safety devices, certain residual risks
cannot be avoided. These are:
• Impairment ofhearing.
• Risk of personal injury due to flyingparticles.
• Risk of burns due to accessories becoming hot
duringoperation.
• Risk of personal injury due to prolongeduse.
SAVE THESE INSTRUCTIONS
Chargers
DeWALT chargers require no adjustment and are designed to be
as easy as possible tooperate.
Electrical Safety
The electric motor has been designed for one voltage only.
Always check that the battery pack voltage corresponds to the
voltage on the rating plate. Also make sure that the voltage of
your charger corresponds to that of yourmains.
Your DeWALT charger is double insulated in
accordance with EN60335; therefore no earth wire
isrequired.
If the supply cord is damaged, it must be replaced by a
specially prepared cord available through the DeWALT
serviceorganisation.
Mains Plug Replacement
(U.K.& Ireland Only)
If a new mains plug needs to be fitted:
• Safely dispose of the oldplug.
• Connect the brown lead to the live terminal in theplug.
• Connect the blue lead to the neutralterminal.
WARNING: No connection is to be made to the
earthterminal.
Follow the fitting instructions supplied with good quality plugs.
Recommended fuse: 3A.
Using an Extension Cable
An extension cord should not be used unless absolutely
necessary. Use an approved extension cable suitable for
the power input of your charger (see Technical Data). The
minimum conductor size is 1mm2; the maximum length
is30m.
When using a cable reel, always unwind the cablecompletely.
Important Safety Instructions for All Battery
Chargers
SAVE THESE INSTRUCTIONS: This manual contains important
safety and operating instructions for compatible battery
chargers (refer to TechnicalData).
• Before using charger, read all instructions and cautionary
markings on charger, battery pack, and product using
batterypack.
WARNING: Shock hazard. Do not allow any liquid to get
inside charger. Electric shock mayresult.
WARNING: We recommend the use of a residual current
device with a residual current rating of 30mA orless.
CAUTION: Burn hazard. To reduce the risk of injury,
charge only DeWALT rechargeable batteries. Other types of
batteries may burst causing personal injury anddamage.
CAUTION: Children should be supervised to ensure that
they do not play with theappliance.
NOTICE: Under certain conditions, with the charger
plugged into the power supply, the exposed charging
contacts inside the charger can be shorted by foreign
material. Foreign materials of a conductive nature such
as, but not limited to, 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 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 DeWALT rechargeable batteries. Any other uses
may result in risk of fire, electric shock orelectrocution.
• Do not expose charger to rain orsnow.
• Pull by plug rather than cord when disconnecting
charger. This will reduce risk ofdamage to electric plug
andcord.
• Make sure that 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.
• Do not place any object on top of 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 charger with damaged cord or plug—
have them replacedimmediately.
• Do not operate charger if it has received a sharp blow,
been dropped, or otherwise damaged in any way. Take it
to an authorised servicecentre.
• Do not disassemble charger; take it to an authorised
service centre when service or repair is required. Incorrect

7
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reassembly may result in a risk of electric shock, electrocution
orfire.
• In case of damaged power supply cord the supply cord must
be replaced immediately by the manufacturer, its service agent
or similar qualified person to prevent anyhazard.
• 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 two chargerstogether.
• The charger is designed to operate on standard
230V household electrical power. Do not attempt to
use it on any other voltage. This does not apply to the
vehicularcharger.
Charging a Battery (Fig.B)
1. Plug the charger into an appropriate outlet before inserting
batterypack.
2. Insert the battery pack6 into the charger, making sure the
battery pack is fully seated in the charger. The red (charging)
light will blink repeatedly 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5 on the batterypack.
NOTE: To ensure maximum performance and life of lithium-ion
battery packs, charge the battery pack fully before firstuse.
Charger Operation
Refer to the indicators below for the charge status of the
batterypack.
Charge Indicators
Charging
Fully Charged
Hot/Cold Pack Delay*
*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 by refusing to light.
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 authorised servicecentre.
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
XR 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 lithium-ion battery
pack on the charger until it is fullycharged.
Wall Mounting
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 25.4mm long
with a screw head diameter of 7–9mm, screwed into wood to
an optimal depth leaving approximately 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. Never let any liquid get inside the tool;
never immerse any part of the tool into aliquid.
Battery Packs
Important Safety Instructions for All Battery
Packs
When ordering replacement battery packs, be sure to include
catalog number andvoltage.
The battery pack is not fully charged out of the carton. Before
using the battery pack and charger, read the safety instructions
below. Then follow charging proceduresoutlined.
READ ALL INSTRUCTIONS
• Do not charge or use battery in explosive atmospheres,
such as in the presence of flammable liquids, gases or
dust. Inserting or removing the battery from the charger may
ignite the dust orfumes.
• Never force battery pack into charger. Do not modify
battery pack in any way to fit into a non-compatible
charger as battery pack may rupture causing serious
personalinjury.

8
ENGLISH
• Charge the battery packs only in DeWALTchargers.
• DO NOT splash or immerse in water or otherliquids.
• Do not store or use the tool and battery pack in
locations where the temperature may reach or exceed
40 ˚C (104 ˚F) (such as outside sheds or metal buildings
in summer).
• 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 persists, seek
medicalattention.
WARNING: Burn hazard. Battery liquid may be flammable
if exposed to spark orflame.
WARNING: Never attempt to open the battery pack for
any reason. If battery pack case is cracked or damaged,
do not insert into charger. Do not crush, drop or damage
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 (i.e., pierced with a nail, hit with
a hammer, stepped on). Electric shock or electrocution
may result. Damaged battery packs should be returned to
service centre 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, tool boxes, product kit
boxes, drawers, etc., with loose nails, screws, keys,etc.
CAUTION: When not in use, place tool on its side on
a stable surface where it will not cause a tripping
or falling hazard. Some tools with large battery packs
will stand upright on the battery pack but may be easily
knockedover.
Transportation
WARNING: Fire hazard. Transporting batteries can
possibly cause fire if the battery terminals inadvertently
come in contact with conductive materials. When
transporting batteries, make sure that the battery
terminals are protected and well insulated from materials
that could contact them and cause a short circuit.
DeWALT batteries comply with all applicable shipping
regulations as prescribed by industry and legal standards which
include UN Recommendations on the Transport of Dangerous
Goods; International Air Transport Association (IATA) Dangerous
Goods Regulations, International Maritime Dangerous Goods
(IMDG) Regulations, and the European Agreement Concerning
The International Carriage of Dangerous Goods by Road (ADR).
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.
In most instances, shipping a DeWALT battery pack will be
excepted from being classified as a fully regulated Class 9
Hazardous Material. In general, only shipments containing a
lithium-ion battery with an energy rating greater than 100 Watt
Hours (Wh) will require being shipped as fully regulated Class 9.
All lithium-ion batteries have the Watt Hour rating marked on
the pack. Furthermore, due to regulation complexities, DeWALT
does not recommend air shipping lithium-ion battery packs
alone regardless of Watt Hour rating. Shipments of tools with
batteries (combo kits) can be air shipped as excepted if the Watt
Hour rating of the battery pack is no greater than 100Whr.
Regardless of whether a shipment is considered excepted
or fully regulated, it is the shipper's responsibility to consult
the latest regulations for packaging, labeling/marking and
documentationrequirements.
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 created. However, no warranty, expressed or
implied, is given. It is the buyer’s responsibility to ensure that its
activities comply with the applicableregulations.
Transporting the FLEXVOLTTM Battery
The DeWALT FLEXVOLTTM battery has two modes: Use
andTransport.
Use Mode: When the FLEXVOLTTM battery stands alone or is in
a DeWALT 18V product, it will operate as an 18V battery. When
the FLEXVOLTTM battery is in a 54V or a 108V (two 54V batteries)
product, it will operate as a 54Vbattery.
Transport Mode: When the cap is attached to the FLEXVOLTTM
battery, the battery is in Transport mode. Keep the cap for
shipping.
When in Transport mode, strings
of cells are electrically
disconnected within the pack
resulting in 3 batteries with a
lower Watt hour (Wh) rating as compared to 1 battery with a
higher Watt hour rating. This increased quantity of 3 batteries
with the lower Watt hour rating can exempt the pack from
certain shipping regulations that are imposed upon the higher
Watt hour batteries.
For example, the Transport
Wh rating might indicate
3x36 Wh, meaning 3
batteries of 36 Wh each.
The Use Wh rating might
indicate 108Wh (1battery implied).
Storage Recommendations
1. The best storage place is one that is cool and dry away
from direct sunlight and excess heat or cold. For optimum
battery performance and life, store battery packs at room
temperature when not inuse.
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.
Example of Use and Transport Label Marking