DeWalt DCS391 User manual

DCS391
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English (original instructions) 4
简体中文 16
Copyright DeWALT

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4
6-1/2" (165 mm) 18 V CORDLESS CIRCULAR SAW
DCS391
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
DCS391
Voltage VDC 18
Type 1
No-load speed min-1 3700
Blade diameter mm 165
Maximum depth of cut mm 55
Blade bore mm 20
Bevel angle adjustment 50˚
Weight (without battery pack) kg 2.9
Battery pack DCB180 DCB181 DCB182
Battery type Li-Ion Li-Ion Li-Ion
Voltage VDC 18 18 18
Capacity A
h
3.0 1.5 4.0
Weight kg 0.64 0.35 0.61
Charger DCB105
Mains voltage VAC 220
Battery type Li-Ion
Approx. charging time min 30 55
(1.5 Ah (3.0 Ah
battery packs) battery packs)
70
(4.0 Ah battery packs)
Weight kg 0.49
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.
WARNING: To reduce the risk of injury,
read the instruction manual.
General Power Tool Safety Warnings
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.
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.

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5
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.
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 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,
clothing and gloves 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.
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 the battery pack 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. 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.
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

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6
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.
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.
ADDITIONAL SPECIFIC SAFETY RULES
Safety Instructions for All Saws
a) DANGER: Keep hands away from cutting
area and the blade. Keep your second hand
on auxiliary handle, or motor housing. If both
hands are holding the saw, they cannot be cut
by the blade.
b) Do not reach underneath the workpiece. The
guard cannot protect you from the blade below
the workpiece.
c) Adjust the cutting depth to the thickness
of the workpiece. Less than a full tooth of
the blade teeth should be visible below the
workpiece.
d) Never hold piece being cut in your hands or
across your leg. Secure the workpiece to a
stable platform. It is important to support the
work properly to minimize body exposure, blade
binding, or loss of control.
e) Hold power tool by insulated gripping
surfaces when performing an operation
where the cutting tool may contact hidden
wiring. Contact with a “live” wire will also make
exposed metal parts of the power tool “live” and
shock the operator.
f) When ripping always use a rip fence or
straight edge guide. This improves the
accuracy of cut and reduces the chance of
blade binding.
g) Always use blades with correct size and
shape (diamond versus round) of arbour
holes. Blades that do not match the mounting
hardware of the saw will run eccentrically,
causing loss of control.
h) Never use damaged or incorrect blade
washers or bolt. The blade washers and
bolt were specially designed for your saw, for
optimum performance and safety of operation.
Causes and Operator Prevention
of Kickback
– Kickback is a sudden reaction to a pinched,
bound or misaligned saw blade, causing an
uncontrolled saw to lift up and out of the
workpiece toward the operator;
– When the blade is pinched or bound tightly
by the kerf closing down, the blade stalls and
the motor reaction drives the unit rapidly back
toward the operator;
– If the blade becomes twisted or misaligned
in the cut, the teeth at the back edge of the
blade can dig into the top surface of the wood
causing the blade to climb out of the kerf and
jump back toward the operator.
Kickback is the result of saw misuse and/or incorrect
operating procedures or conditions and can be
avoided by taking proper precautions as given
below:
a) Maintain a firm grip with both hands on
the saw and position your arms to resist
kickback forces. Position your body to
either side of the blade, but not in line with
the blade. Kickback could cause the saw to
jump backwards, but kickback forces can be
controlled by the operator, if proper precautions
are taken.
b) When blade is binding, or when interrupting
a cut for any reason, release the trigger and
hold the saw motionless in the material until
the blade comes to a complete stop. Never
attempt to remove the saw from the work
or pull the saw backward while the blade is
in motion or kickback may occur. Investigate
and take corrective actions to eliminate the
cause of blade binding.
c) When restarting a saw in the workpiece,
centre the saw blade in the kerf and check
that saw teeth are not engaged into the
material. If saw blade is binding, it may walk up
or kickback from the workpiece as the saw is
restarted.
d) Support large panels to minimise the risk of
blade pinching and kickback. Large panels
tend to sag under their own weight. Supports
must be placed under the panel on both sides,

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7
near the line of cut and near the edge of the
panel.
e) Do not use dull or damaged blades.
Unsharpened or improperly set blades produce
narrow kerf causing excessive friction, blade
binding and kickback.
f) Blade depth and bevel adjusting locking
levers must be tight and secure before
making cut. If blade adjustment shifts while
cutting, it may cause binding and kickback.
g) Use extra caution when making a “plunge
cut” into existing walls or other blind areas.
The protruding blade may cut objects that can
cause kickback.
Safety Instructions for Saws with a
Pendulum Blade Guard
a) Check lower guard for proper closing before
each use. Do not operate the saw if lower
guard does not move freely and close
instantly. Never clamp or tie the lower guard
into the open position. If saw is accidentally
dropped, lower guard may be bent. Raise the
lower guard with the retracting handle and
make sure it moves freely and does not touch
the blade or any other part, in all angles and
depths of cut.
b) Check the operation of the lower guard
spring. If the guard and the spring are not
operating properly, they must be serviced
before use. Lower guard may operate
sluggishly due to damaged parts, gummy
deposits, or a build-up of debris.
c) Lower guard should be retracted manually
only for special cuts such as “plunge cuts”
and “compound cuts”. Raise lower guard
by retracting handle and as soon as blade
enters the material, the lower guard must be
released. For all other sawing, the lower guard
should operate automatically.
d) Always observe that the lower guard is
covering the blade before placing saw down
on bench or floor. An unprotected, coasting
blade will cause the saw to walk backwards,
cutting whatever is in its path. Be aware of the
time it takes for the blade to stop after switch is
released.
Additional Safety Instructions for
Circular Saws
 • Wear ear protectors. Exposure to noise can
cause hearing loss.
 • Wearadustmask.Exposure to dust particles
can cause breathing difficulty and possible
injury.
 • Donotusebladesoflargerorsmaller
diameter than recommended. For the proper
blade rating refer to the technical data. Use only
the blades specified in this manual, complying
with EN 847-1.
 • Neveruseabrasivecut-offwheels.
 • Do not use water feed attachments.
 • Use clamps or another practical way to
secure and support the workpiece to a
stable platform. Holding the work by hand or
against your body leaves it unstable and may
lead to loss of control.
Residual Risks
The following risks are inherent to the use of circular
saws.
– Injuries caused by touching the rotating parts or
hot part of the tool.
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 squeezing fingers when changing the
accessory.
– Health hazards caused by breathing dust
developed when working in wood.
Markings on Tool
The following pictograms are shown on the tool:
Read instruction manual before use.
Wear ear protection.
Wear eye protection.
DATE CODE POSITION
The Date Code, which also includes the year of
manufacture, is printed into the housing surface that
forms the mounting joint between tool and battery.
Example:
2012 XX XX
Year of Manufacture

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8
Important Safety Instructions for All
Battery Chargers
SAVE THESE INSTRUCTIONS: This manual
contains important safety and operating instructions
for the DCB105 battery charger.
 • Beforeusingthecharger,readallinstructions
and cautionary markings on charger, battery
pack and product using the battery pack.
WARNING: Shock hazard. Do not allow
any liquid to get inside charger. Electric
shock may result.
CAUTION: Burn hazard. To reduce
the risk of injury, charge only DeWALT
rechargeable battery packs. Other types
of batteries may overheat and burst
resulting in personal injury and property
damage.
CAUTION: Children should be
supervised to ensure that they do not
play with the appliance.
NOTICE: Under certain conditions, with
the charger plugged in to 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.
 • 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.
 • Donotblocktheventilationslotsonthe
charger.Theventilationslotsarelocated
on the top and sides of the charger. Place
the charger in a position away from any heat
source.
 • 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thecharger;takeitto
an authorised service centre when service or
repair is required. Incorrect 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 2 chargers together.
 • Thechargerisdesignedtooperateon
standard220Vhouseholdelectricalpower.
Do not attempt to use it on any other
voltage. This does not apply to the vehicular
charger.
SAVE THESE INSTRUCTIONS
Chargers
The DCB105 charger accepts 10.8 V, 14.4 V and
18V Li-Ion (DCB121, DCB123, DCB140, DCB141,
DCB142, DCB180, DCB181 and DCB182) battery
packs.
This charger requires no adjustment and is designed
to be as easy as possible to operate.
Charging Procedure (fig. 2)
1. Plug the charger into an appropriate 230 V
outlet before inserting the battery pack.
2. Insert the battery pack (c) into the charger,
making sure the pack is fully seated in the

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9
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
pack is fully charged and may be used at this
time or left in the charger.
NOTE: To ensure maximum performance and life of
Li-Ion batteries, fully charge the pack before first use.
Charging Process
Refer to the table below for the state of charge of
the battery pack.
State of charge
charging –– –– –– ––
fully charged –––––––––––––––––
 hot/coldpackdelay ––•––•––• ––•
x
 problempackorcharger ••••••••••••
 problempowerline ••••••••••••
This charger will not charge a faulty battery pack.
The charger will indicate faulty battery by refusing to
light or by displaying 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 authorised
service centre.
Hot/Cold Pack Delay
When the charger detects a battery that is too hot
or too cold, it automatically starts a hot/cold pack
delay, suspending charging until the battery has
reached an appropriate temperature. The charger
then automatically switches to the pack charging
mode. This feature ensures maximum battery life.
XR Li-Ion tools are designed with an Electronic
Protection System that will protect the battery
against overloading, overheating or deep discharge.
The tool will automatically turn off if the Electronic
Protection System engages. If this occurs, place the
Li-Ion battery on the charger until it is fully charged.
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 warms.
Important Safety Instructions for All
Battery Packs
When ordering replacement battery packs, be sure
to include the 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 and then follow
the 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 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.
 • 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toolandbattery
pack in locations where the temperature
may reach or exceed 40°C (105°F) (such as
outside sheds or metal buildings in summer).
 • Forbestresults,makesurethebatterypackis
fully charged before use.
WARNING: Never attempt to open
the battery pack for any reason. If
the battery pack case is cracked or
damaged, do not insert it into the
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 (e.g., pierced
with a nail, hit with a hammer, stepped
on). Electric shock or electrocution may
result. Damaged battery packs should
be returned to the service centre for
recycling.
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.

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10
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 the area with
mild soap and water. If the 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.
Battery Pack
BATTERY TYPE
The DCS391 operates on 18 volt battery packs.
The DCB180, DCB181 or DCB182 battery packs
may be used. Refer to Technical Data for more
information.
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.
NOTE: Battery packs should not be stored
completely depleted of charge. The battery pack will
need to be recharged before use.
Labels on Charger and Battery Pack
In addition to the pictographs used in this manual,
the labels on the charger and the battery pack show
the following pictographs:
Read instruction manual before use.
Charging.
Fully charged.
Hot/cold pack delay.
xProblem pack or charger.
Problem powerline.
Do not probe with conductive objects.
Do not charge damaged battery packs.
Use only with DeWALT battery packs.
Others may burst, causing personal injury
and damage.
Do not expose to water.
Have defective cords replaced
immediately.
Charge only between 4°C and 40°C.
Discard the battery pack with due care for
the environment.
Do not incinerate the battery pack.
Charges Li-Ion battery packs.
See Technical Data for charging time.
Only for indoor use.
Package Contents
The package contains:
1 Cordless circular saw
1 24-tooth blade
1 Hex key
1 Rip Guide
1 Plastic bag:
1 Dust extraction port

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11
1 M4 X 18 Cap screw
2 Li-Ion battery packs (L2, M2 models)
1 Kitbox
1 Charger
1 Instruction manual
1 Exploded drawing
NOTE: Battery packs, chargers and kitboxes are not
included with N-models.
 • Checkfordamagetothetool,partsor
accessories which may have occurred during
transport.
 • Takethetimetothoroughlyreadand
understand this manual prior to operation.
Description (fig. 1, 4, 6)
WARNING: Never modify the power
tool or any part of it. Damage or
personal injury could result.
a. Trigger switch lock-off button
b. Trigger switch
c. Battery pack
d. Depth adjustment lever
e. Shoe
f. Lower blade guard retracting lever
g. Lower blade guard
h. Blade clamping screw
i. Kerf indicator
j. Bevel adjustment knob
k. Blade lock button
l. Auxiliary handle
m. Battery release button
n. Hex key
o. Rip guide knob
p. Rip guide
INTENDED USE
Your DCS391 cordless circular saw has been
designed for professional sawing applications.
DO NOT use under wet conditions or in presence of
flammable liquids or gases.
These heavy-duty circular saws are professional
power tools. DO NOT let children come into
contact with the tool. Supervision is required when
inexperienced operators use this tool.
 •Thisproductisnotintendedforusebypersons
(including children) suffering from diminished
physical, sensory or mental abilities; lack of
experience, knowledge or skills unless they are
supervised by a person responsible for their
safety. Children should never be left alone with
this product.
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 EN 60335; 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 organization.
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.
ASSEMBLY AND ADJUSTMENTS
WARNING: Prior to assembly and
adjustment, always remove the battery
pack. Always switch off the tool before
inserting or removing the battery pack.
WARNING: Use only DeWALT battery
packs and chargers.
Inserting and Removing the
Battery Pack from the Tool (fig. 2)
NOTE: For best results, make sure your battery
pack is fully charged. The light will shut off without
warning when the battery is fully discharged.
TO INSTALL THE BATTERY PACK INTO THE TOOL HANDLE
1. Align the battery pack (c) with the rails inside the
tool’s handle (fig. 2).
2. Slide it into the handle until the battery pack is
firmly seated in the tool and ensure that it does
not disengage.
TO REMOVE THE BATTERY PACK FROM THE TOOL
1. Press the battery release button (m) and firmly
pull the battery pack out of the tool handle.
2. Insert battery pack into the charger as
described in the charger section of this manual.

ENGLISH
12
FUEL GAUGE BATTERY PACKS (FIG. 2)
Some DeWALT battery packs include 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 (v). 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.
Trigger Switch (fig. 1)
WARNING: This tool has no provision
to lock the trigger switch in the ON
position and should never be locked ON
by any other means.
Release the trigger switch lock-off button (a) by
pressing the button as shown. Pull the trigger switch
(b) to turn the motor on. Releasing the trigger switch
turns the motor off.
Depth of Cut Adjustment (fig. 1, 3)
1. Loosen the depth adjustment lever (d).
2. Move the shoe (e) to obtain the correct depth of
cut.
3. Tighten the depth adjustment lever (d).
4. For optimal results, allow the saw blade to
protrude from the workpiece by about 3 mm
(see inset in figure 3).
Bevel Adjustment (fig. 4)
The bevel angle can be adjusted between 0° and
50°.
1. Loosen the bevel adjustment knob (j).
2. Set the bevel angle by tilting the saw shoe (e)
until the mark indicates the desired angle on
the scale.
3. Tighten the bevel adjustment knob (j).
Shoe Adjustment for 90° Cuts
(fig. 1, 5)
1. Adjust the saw to 0° bevel.
2. Retract the blade guard using the lever (f) and
place the saw on the blade side.
3. Loosen the bevel adjustment knob (j).
4. Place a square against the blade and shoe to
adjust the 90° setting.
5. Turn the calibration screw (q) so that the shoe
will stop at the proper angle.
6. Confirm the accuracy of the setting by checking
the squareness of an actual cut on a scrap
piece of material.
Rip Guide Installation and Usage
(fig. 6)
Ripping is the process of cutting wider boards into
narrow strips, cutting the grain lengthways. Hand
guiding is more difficult for this type of sawing and
the use of the rip guide is recommended.
WARNING: For your own safety, read
the instruction manual before using
any accessory. Failure to heed these
warnings may result in personal injury
and serious damage to the saw and
accessory. When servicing this tool, only
use identical replacements.
ASSEMBLY
1. Loosen the rip guide knob (o).
2. Insert the rip guide (p) as shown in figure 6.
3. Tighten the rip guide knob (o) securely.
Use the supplied rip guide only with the DCS391
circular saw. Use of this rip guide with other saws
may increase the risk of kickback and injury.
Before making a cut, ensure the rip fence is securely
fastened to the tool.
After installing the rip guide on the saw or after
moving the guide to change the rip width setting,
check the operation of the lower guard before
starting the saw and making a cut to make sure that
the rip guide does not affect proper guard operation.
Replacing the Saw Blade (fig. 7)
1. Engage the blade lock button (k) and unscrew
the blade clamping screw (h) by turning
counterclockwise using the hex key supplied
with the tool.
2. Retract the lower blade guard (g) using the lever
(f) and replace the blade. Reinstall the washers
(r, s) in the correct position.
3. Check the direction of rotation of the blade.

ENGLISH
13
4. Thread on the blade clamping screw (h) by
hand to hold the washer in position. Turn
clockwise.
5. Press the blade lock button (k) while turning the
spindle until the blade stops rotating.
6. Tighten the blade clamping screw firmly using
the hex key.
Blades
WARNING: To minimize the risk of
eye injury, always use eye protection.
Carbide is a hard but brittle material.
Foreign objects in the workpiece such
as wire or nails can cause tips to crack
or break. Only operate saw when proper
saw blade guard is in place. Mount
blade securely in proper rotation before
using, and always use a clean, sharp
blade.
WARNING: Do not cut ferrous metals
(steel), masonry, glass, masonry-type
planking, cement board or tile with this
saw.
Do not use abrasive wheels or blades. A dull blade
will cause slow inefficient cutting, overload on
the saw motor, excessive splintering, and could
increase the possibility of kickback.
If you need assistance regarding blades, please call
contact your local service center listed on the back
of the manual.
Prior to Operation
 • Makesureyourbatterypackis(fully)charged.
 • Makesuretheguardshavebeenmounted
correctly. The saw blade guard must be in
closed position.
 • Makesurethesawbladerotatesinthedirection
of the arrow on the blade.
 • Donotuseexcessivelywornsawblades.
OPERATION
WARNING: Turn unit off and
disconnect battery pack before
installing and removing accessories,
before adjusting or when making
repairs. Lock the trigger switch when
the tool is not in use and when storing
the tool.
WARNING: Always wear proper
personal hearing protection. Under
some conditions and duration of use,
noise from this product may contribute
to hearing loss.
Instructions for Use
WARNING:
    • Alwaysobservethesafety
instructions and applicable
regulations.
    • Ensurethematerialtobesawnis
secured in place.
    • Applyonlyagentlepressuretothe
tool and do not exert side pressure
on the saw blade. If possible, work
with the saw shoe pressed against
the workpiece. This prevents damage
to the blade and stops the tool from
jerking and vibrating.
    • Avoidoverloading.
    • Letthebladerunfreelyforafew
seconds before starting the cut.
Proper Hand Position (fig. 8)
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.
Hold the tool by the main grip (t) and the auxiliary
handle (l) to guide the saw properly.
Switching On and Off (fig. 1)
For safety reasons the trigger switch (b) of your tool
is equipped with a lock-off button (a).
Press the lock-off button to unlock the tool.
To run the tool, press the trigger switch (b). As soon
as the trigger switch is released the lock-off switch
is automatically activated to prevent unintended
starting of the machine.
NOTICE: Do not switch the tool ON or
OFF when the saw blade touches the
workpiece or other materials.
Guiding the Tool (fig. 1)
 • Foroptimumresults,clamptheworkpiece
bottom up.
 • Usethekerfindicator(i)tofollowthelinedrawn
on the workpiece. The kerf indicator lines up
with the left side of the saw blade when set to
50° bevel. The kerf indicator lines up with the
right side of the saw blade when set to 0° bevel.

ENGLISH
14
Dust Extraction (fig. 9)
A dust extraction port (u) is supplied with your tool.
 • Alwaysuseavacuumextractordesigned
in compliance with the applicable Directives
regarding dust emission when sawing wood.
Vacuum hoses of most common vacuum
cleaners will fit directly into the dust extraction
spout.
TO INSTALL DUST EXTRACTION PORT (FIG. 9)
1. Fully loosen depth adjustment lever (d).
2. Place shoe (e) in the lowest position.
3. Align dust extraction port (u) against the bracket
on the shoe as shown.
4. Align tab on the dust extraction port with the
threaded hole on the bracket.
5. Insert screw and tighten securely.
MAINTENANCE
Your DeWALT power tool has been designed to
operate over a long period of time with a minimum
of maintenance. Continuous satisfactory operation
depends upon proper tool care and regular cleaning.
WARNING: To reduce the risk of
serious personal injury, turn tool
off and disconnect battery pack
before making any adjustments or
removing/installing attachments or
accessories. An accidental start-up
can cause injury.
The charger and battery pack are not serviceable.
There are no serviceable parts inside.
Lubrication
Your power tool requires no additional lubrication.
Cleaning
WARNING: Blow dirt and dust out of
the main housing and the guard area
with dry air as often as dirt is seen
collecting in and around the air vents.
Wear approved eye protection and
approved dust mask when performing
this procedure.
LOWER GUARD
The lower guard should always rotate and close
freely from a fully open to fully closed position.
Always check for correct operation before cutting
by fully opening the guard and letting it close. If the
guard closes slowly or not completely it will need
cleaning or servicing. Do not use the saw until it
functions correctly. To clean the guard, use dry air
or a soft brush to remove all accumulated sawdust
or debris from the path of the guard and from
around the guard spring. Should this not correct the
problem, it will need to be serviced by an authorized
service center.
WARNING: Never use solvents or
other harsh chemicals for cleaning the
non-metallic parts of the tool. These
chemicals may weaken the materials
used in these parts. Use a cloth
dampened only with water and mild
soap. Never let any liquid get inside the
tool; never immerse any part of the tool
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.
Optional Accessories
WARNING: Since accessories, other
than those offered by DeWALT, have
not been tested with this product, use
of such accessories with this tool could
be hazardous. To reduce the risk of
injury, only DeWALT, recommended
accessories should be used with this
product.
DO NOT USE WATER FEED ATTACHMENTS WITH
THIS SAW.
VISUALLY EXAMINE CARBIDE BLADES BEFORE
USE. REPLACE IF DAMAGED.
Consult your dealer for further information on the
appropriate accessories.
Protecting the Environment
Separate collection. This product must
not be disposed of with normal
household waste.
Should you find one day that your DeWALT product
needs replacement, or if it is of no further use to you,

ENGLISH
15
do not dispose of it with household waste. Make this
product available for separate collection.
Separate collection of used products
and packaging allows materials to be
recycled and used again. Re-use of
recycled materials helps prevent
environmental pollution and reduces
the demand for raw materials.
Local regulations may provide for separate collection
of electrical products from the household, at
municipal waste sites or by the retailer when you
purchase a new product.
DeWALT provides a facility for the collection and
recycling of DeWALT products once they have
reached the end of their working life. To take
advantage of this service please return your product
to any authorised repair agent who will collect them
on our behalf.
You can check the location of your nearest
authorised repair agent by contacting your local
DeWALT office at the address indicated in this
manual. Alternatively, a list of authorised DeWALT
repair agents and full details of our after-sales
service and contacts are available on the Internet at:
www.2helpU.com.
Rechargeable Battery Pack
This long life battery pack must be recharged when
it fails to produce sufficient power on jobs which
were easily done before. At the end of its technical
life, discard it with due care for our environment:
 • Runthebatterypackdowncompletely,then
remove it from the tool.
 • Li-Ioncellsarerecyclable.Takethemtoyour
dealer or a local recycling station. The collected
battery packs will be recycled or disposed of
properly.

简体中文
15
祝贺您！
感谢您选择得伟工具。凭借多年的经验以及全面的产品开发与创新，得伟已经成为专业电动工具使用者最值
得信赖的伙伴之一。
如果你对这款或者任何的得伟工具有任何的疑问或者意见，请致电：800-820-4221或者 400-620-4221
18V锂电充电式圆锯
DCS391
技术数据
定 义 ：安 全 准 则
下列定义解释了各警示词的严重程度。请仔细阅读本
手册并注意这些符号。
危险: 指 示 紧 急 的 危 险 情 形 ，如 不 加 以 避 免 ，
将导致死亡或严重伤害。
警告：
指示潜在的危险情形，如不加以避免，
可能导致死亡或严重伤害。
警示：
指示潜在的危险情形，如不加以避免，
可能导致轻度或中度伤害。
表示存在火灾风险。
表示有触电风险。
警告：为 降 低 伤 害 风 险 ，请 阅 读 使 用 手 册 。
注 意 ：指 示 不 涉 及 人 身 伤 害 的 情 况 ，如 不 加
以避免，可能导致财产损失。
电动工具安全通则
请保存所有警告和指示，以备将来查阅。
在 所 有 以 下 列 举 的 警 告 中 术 语“ 电 动 工 具 ”指 用 电 驱
动（ 有 线 ）电 动 工 具 或 电 池 驱 动（ 无 线 ）电 动 工 具 。
1 、工 作 场 所 安 全
a) 保持工作场地清洁和明亮。混乱和黑暗的场地会
引发事故。
b) 不要在易爆环境，如有易燃液体、气体或粉尘的
环境下操作电动工具。电动工具产生的火花会点燃粉
尘或气体。
c) 让儿童和旁观者离开后操纵电动工具。分心会使
你放松控制。
2 、电 气 安 全
a) 电动工具插头必须与插座相配。不能以任何方式
改装插头。需接地的电动工具不能使用任何转换插
头。未经改装的插头和相配的插座将减少触电危险。
b) 避免人体接触接地表面，如管道、散热片和冰箱。
如果你身体接地会增加触电危险。
c) 不得将电动工具暴露在雨中或潮湿环境中。水进
入 电 动 工 具 将 增 加 触 电 危 险 。d ) 不 得 滥 用 电 线 。绝
不能用电线搬运、拉动电动工具或拔出其插头。让电
动 工 具 远 离 热 、油 、锐 边 或 运 动 部 件 。受 损 或 缠 绕 的
电线会增加触电危险。
e) 当在户外使用电动工具时，使用适合户外使用的
外接电线。适合户外使用的电线将减少触电危险。
警告！
请仔细阅读所有安全警告和指示说
明。不遵循下列的警告和指示则可能会导致
触 电 、火 灾 和 / 或 严 重 伤 害 。
DCS391
电压 伏特（直流） 18
类型 1
空载转速 转／分 3700
锯片 毫米 165
最大锯切深度 毫米 55
锯片孔径 毫米 20
坡口调节范围 50˚
重量（不含电池组） 千克 2.9
电池组 DCB180 DCB181 DCB182
类型 锂离子 锂离子 锂离子
电压 伏特 18 18 18
容量 安时 3.0 1.5 4.0
重量 千克 0.64 0.35 0.61
充电器 DCB105
电压 220V
类型 锂离子
充电时间 30分钟 55分钟
(1.5安时电池组) (3.0安时电池组)
70分钟
(4.0 安时电池组)
Weight 0.49

简体中文
16
5、电池式工具使用和注意事项
a) 只用制造商规定的充电器充电。将适用于某种电
池盒的充电器用到其他电池盒时会发生着火危险。
b) 只使用配有特制电池盒的电动工具。使用其他电
池盒会发生损坏和着火危险。
c) 当电池盒不用时，将它远离其他金属物体，例如回
形针、硬币、钥匙、钉子、螺钉或其他小金属物体，以
防一端与另一端连接。电池端部短路会引起燃烧或
者火灾。
d) 在滥用条件下，液体会从电池中溅出；避免接触。
如果无意间碰到了，用水冲洗。如果液体碰到了眼
睛，还要寻求医疗帮助。从电池中溅出的液体会发生
腐蚀或燃烧。
6 、维 修
让专业维修人员使用特定的备件维修电动工具。这
将保证所维修的电动工具的安全。
特殊安全附则
电圆锯通用安全守则
危险：
a) 让手始终远离锯割区域和锯片。你的另一只手始
终握住辅助手柄或电动机机壳。如果双手都握住圆
锯 ，就 不 会 被 锯 片 伤 害 。
b) 不要接触工件的下面。护罩不能防止工件下方巨
片的危险。
c) 将锯割深度调至工件的厚度。能看到在工件下露
出的锯齿应不到一个齿高。
d) 不得手持工件或将工件架在腿上进行锯割，应将
工件夹紧在一个稳定的平台上。适当支持工件对减少
人身伤害、锯片卡住或操作失控是至关重要的。
e) 在锯割工具进行操作时邮可能碰到暗线或自身电
线的场合，须通过绝缘握持面来握住电动工具。“带
电”电线也会使工具的裸露金属部分带电，从而碰到
使操作者触电。
f) 当作劈锯时，始终使用劈锯护栏和直边导向器。
这样改善了锯割精度并减少了锯片卡住的几率。
g) 始终使用尺寸和轴心形状（菱形或圆形）得当的
锯片。如果锯片与圆锯夹装部件不符将引起偏心运转
而导致失控。
h) 不得使用损坏的和尺寸不符的垫圈和螺栓。为改
善作业和安全运行，锯片垫圈及螺栓是为圆锯专门设
计的。
回弹的原因和操作者的防护：
- 回弹是当锯片受挤压、被卡住或偏离中心的突然反
作用，使圆锯不受控制地抬起并脱离工件冲向操作
者。
- 当锯片受挤压或被收拢地切口紧紧卡住时，锯片堵
转且电动机反作用力驱使整机朝操作者快速弹回。
f) 如果在潮湿的环境中使用电动工具，请使用漏电
保护装置（RCD）。使用此装置可降低触电危险。
3) 人身安全
a) 保持警觉，当操作电动工具时关注所从事的操作
并保持清醒。切勿在有疲倦、药物、酒精或治疗反应
下操作电动工具。在操作电动工具期间精力分散会导
致严重人身伤害。
b) 使用安全装置。始终配戴护目镜。安全装置，诸如
适 当 条 件 下 的 防 尘 面 具 、防 滑 安 全 鞋 、安 全 帽 、听 力
防 护 等 装 置 能 减 少人 身 伤 害。
c) 避免突然起动。确保开关在插入插头时处于关断
位置。手指放在已接通电源的开关上或开关处于接
通时插入头可能会导致危险。
d) 在电动工具接通之前，拿掉所有调节钥匙或扳
手。遗留在电动工具旋转零件上的扳手或钥匙会导致
人身伤害。
e) 手不要伸得太长。时刻注意脚下和身体平衡。这
样在意外情况下能很好地控制电动工具。
f) 着装适当。不要穿宽松衣服或佩带饰品。让你的
头发、衣服和袖子远离运动部件。宽松衣服、佩饰或
长发可能会卷入运动部件。
g ) 如 果 提 供 了 与 排 屑 装 置 、集 尘 设 备 连 接 用 的 装
置，则确保他们连接完好且使用得当。使用这些装置
可减少碎屑引起的危险。
4）电动工具使用和注意事项
a) 不要滥用电动工具，根据用途使用适当的电动工
具。选用适当的设计额值的电动工具会使你工作有
效 、更 安 全 。
b) 如果开关不能接通或关断工具电源，则不能使用
该电动工具。不能用开关来控制的电动工具是危险的
且必须进行修理。
c) 在进行任何调节、更换附件或贮存电动工具之
前，必须从电源上拔掉插头和／或将电池盒脱开电
源。这种防护性措施将减少电动工具突然起动的危
险。
d) 将闲置电动工具贮存在儿童所及范围之外，并且
不要让不熟悉电动工具或对这些说明不了解的人操
作电动工具。电动工具在未经训练的用户手中是危险
的。
e) 保养电动工具。检查运动部件的安装偏差或卡
住、零件破损情况和影响电动工具运行的其它条件。
如有损坏，电动工具必须在使用前修理好。许多事故
由维护不良的电动工具引发。
f) 保持切削刀具锋利和清洁。保养良好的有锋利切
削刃的刀具不易卡住而且容易控制。
g) 按照使用说明书以及打算使用的电动工具的特殊
类型要求的方式，考虑作业条件和进行的作业来使
用电动工具、附件和工具的刀头等。电动工具用作那
些与要求不符的操作可能会导致危险情况。

简体中文
17
电圆锯安全附则
佩戴听力保护器。暴露在噪音中会损伤听力。
佩戴防尘面罩。灰尘颗粒会导致呼吸困难或损伤。
请勿使用大于或小于推荐直径的锯片。参考技术资
料选择合适的锯片。仅使用本手册规定的锯片，符合
EN847-1要求。
禁止使 用研磨 切割轮片。
禁止使用给水配件。
请使用夹钳或其它切实可行的方法来固定和支撑工
件，将其固定到稳定的工作台上。用手握住工件或用
身体抵住工件并不稳定，可能会导致工件失控。
残余风险
以下风险是使用电圆锯所固有的：
- 接触旋转部件或灼热部件造成的伤害。
尽管实行了相关的安全法规、采用了安全装置，某些
残余风险是不可避免的，它们是：
- 听力损伤
- 更换配件时挤伤手指的风险
- 锯割木材时，吸入粉尘导致的健康风险
工具上的标识
本工具上附带下列图形：
使用前阅读使用手册。
佩戴听力保护器
佩戴护目镜
日期码的位置
日期码包含制造年份，已经印在工具外壳上，位置介
于工具 和电池之间的接合处。
例如：
2012 XX XX
制造年份
适用于所有电池充电器的重要安全守则
请妥善保管好这些说明：本手册含有适用于DCB105电
池充电器的重要安全和操作守则。
使用充电器之前，请阅读充电器、电池组以及使用电
池组的产品的所有守则和注意标示。
- 如果锯片发生扭曲或偏离锯割面，锯片后边缘上的
锯齿会挖入木材上表面从而引起锯片爬出切口并朝
操作者回弹。
回弹是误用圆锯和/或不正确操作程序或条件导致的
结果，采取以下适当预防措施可避免回弹。
a) 双手紧握圆锯上的把手，双臂放置得能抵住回弹
力。身体处于圆锯得任意一侧而不对准锯片。回弹会
导致圆锯的向后弹起，但如果采取了适当的防备措
施 ，回 弹 力 可 以 受 操 作 者 的 控 制 。
b) 当锯片卡住，或因任何原因导致的锯割中断时，
释放开关扳机并握持圆锯在材料中不移动，直到锯片
完全停止。不得在锯片处于运转或可能发生回弹情况
下尝试将圆锯从工件中拿走或向后拉动圆锯。调查并
采取正确的措施以消除锯片卡住的原因。
c) 当在工件中重新起动圆锯时，将锯片对准切口并
检查锯齿是否插入材料。如果锯片卡住了，工具重新
起动时，锯片会爬出工件或从工件上回弹。
d) 支撑大型板料以减少锯片手挤压和回弹得危害。
大型板料因自重向下垂，支撑物必须放置在板料下面
的两侧，靠近切割线和板料边缘都要放置。
e) 不得使用钝的或破损的锯片。没有开锋的或安装
不当的锯片会形成窄小的锯痕，从而导致剧烈摩擦、
锯片卡住和回弹。
f) 锯割之前，锯割深度和倾角调节锁定钮必须旋紧
和紧固。如果锯割时锯片调节器发生移动，可能会引
起锯片卡住和回弹。
g) 当对现存墙体或其他盲区进行“插入式锯割”时
要格外小心。伸出锯片可能会锯割到引起回弹的物
体。
摆动式锯片护罩安全须知
a) 每次使用前，检查下护罩闭合是否自如。如果下
护罩不能迅速回复，则不得操作圆。不得将下护罩夹
住或系绑在开启位置。如果圆锯突然跌落，下护罩可
能会弯曲变形。用回缩手柄抬起下护罩，确信在任何
锯割角度和深度下护罩回缩自如，且碰不会触及锯片
和任何其它零件。
b) 检查下护罩弹簧的工作情况，如果护罩及弹簧不
能 正 常 工 作 ， 必 须 在 使 用 前 对 其 进 行 维 修 。下 护 罩 可
能因零件损害、胶质沉积或废屑堆积而运动迟缓。
c) 仅当特殊锯割，例如“插入式锯割”和“组合式锯
割”，才应用手动方式抬起下护罩。用回缩手柄抬起
下护罩，锯片刚一进入到锯割材料就必须释放下护
罩。对所有其他锯割作业，下护罩应自动回复。
d) 在把圆锯放置在工作台或地板上之前始终能看到
下护罩式遮住锯片的。未经防护的、邮惯性的锯片会
引起圆锯后退，锯割到其行程上的物体，要考虑到开
关释放后锯片停下来的时间。