Skil 1781 User manual


ORIGINAL INSTRUCTIONS 9
www.skil.com
ROTARY HAMMER
1781 (RH1*1781**)
SKIL BV - Rithmeesterpark 22 A1 - 4838GZ - Breda - NL 10/22 2610S01543
UK: Chervon Europe Ltd. - 34 Bridge Street- Reading - RG1 2LU

2
1781

EU Declaration of conformity
Rotary hammer Article number
We declare under our sole responsibility that the stated products comply with all
applicable provisions of the directives and regulations listed below and are in
conformity with the following standards.
Technical le at:
*
1781 RH1*1781** 2006/42/EC
2014/30/EU
2011/65/EU
EN 62841-1:2015
EN 62841-2-6:2020 + A11:2020
EN 55014-1:2021
EN 55014-2:2021
EN 61000-3-2:2019+A1:2021
EN 61000-3-3:2013+A1:2019
EN 63000:2018
*Skil BV
Rithmeesterpark 22 A1
4838 GZ Breda
The Netherlands
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21.10.2022

3
1781
Declaration of Conformity
Rotary hammer Article number
We declare under our sole responsibility that the stated products comply with all
applicable provisions of the directives and regulations listed below and are in
conformity with the following standards
Technical le at:
Chervon Europe Ltd., 34 Bridge Street, Reading, RG1 2LU, United Kingdom
1781 RH1*1781** Supply of Machinery (Safety) Regulations 2008 (SI 2008/1597)
Electromagnetic Compatibility Regulations 2016 (SI 2016/1091)
The Restriction of the Use of Certain Hazardous Substances in
Electrical and Electronic Equipment Regulations 2012 (SI 2012/3032)
EN 62841-1:2015
EN 62841-2-6:2020 + A11:2020
EN 55014-1:2021
EN 55014-2:2021
EN 61000-3-2:2019+A1:2021
EN 61000-3-3:2013+A1:2019
EN IEC 63000:2018
Chervon Europe Ltd., 34 Bridge Street,
Reading, RG1 2LU, United Kingdom, as
authorized representative (in terms of above
regulations) acting on behalf of
Skil BV, Rithmeesterpark 22 A1, 4838GZ
Breda, The Netherlands
James McCrory
Technical Service Manager
Place of issue: Reading
Date of issue: 21/10/2022

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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
inuence 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 o-position before connecting to power
source and/or battery pack, picking up or carrying
the tool. Carrying power tools with your nger 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 o. 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/
a
Rotary hammer 1781
INTRODUCTION
• This tool is intended for hammer drilling in concrete, brick
and stone as well as for light chiseling work; for drilling in
wood, metal and plastic
• The hammering system in this tool outperforms any
traditional ratcheting drill when drilling in concrete
• This tool is not intended for professional use
• This tool is designed for use in combination with all
standard SDS+ accessories
• Read and save this instruction manual 3
TECHNICAL DATA 1
TOOL ELEMENTS 2
A Switch for on/o
B Wheel for maximum speed control
C Unlocking button
D Switch for selecting operating mode
E Second switch for selecting operating mode
F Locking sleeve
G Auxiliary handle
H Ventilation slots
J Depth gauge
SAFETY
GENERAL POWER TOOL SAFETY WARNINGS
-WARNING Read all safety warnings, instructions,
illustrations and specications provided with this
power tool. Failure to follow all instructions listed below may
result in electric shock, re 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 ammable
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.
Unmodied 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

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• Always disconnect plug from power source before
making any adjustment or changing any accessory
ACCESSORIES
• SKIL can assure awless functioning of the tool only
when original accessories are used
• Use only accessories with an allowable speed matching
at least the highest no-load speed of the tool
BEFORE USE
• Use completely unrolled and safe extension cords with a
capacity of 16 Amps (U.K. 13 Amps)
• Avoid damage that can be caused by screws, nails and
other elements in your workpiece; remove them before
you start working
• Secure the workpiece (a workpiece clamped with
clamping devices or in a vice is held more securely than
by hand)
• Use suitable detectors to nd hidden utility lines
or call the local utility company for assistance
(contact with electric lines can lead to re or electrical
shock; damaging a gas line can result in an explosion;
penetrating a water pipe will cause property damage or
an electrical shock)
• Dust from material such as paint containing lead, some
wood species, minerals and metal may be harmful
(contact with or inhalation of the dust may cause allergic
reactions and/or respiratory diseases to the operator or
bystanders); wear a dust mask and work with a dust
extraction device when connectable
• Certain kinds of dust are classied as carcinogenic
(such as oak and beech dust) especially in conjunction
with additives for wood conditioning; wear a dust
mask and work with a dust extraction device when
connectable
• Follow the dust-related national requirements for the
materials you want to work with
DURING USE
• Always keep the cord away from moving parts of the tool
• In case of electrical or mechanical malfunction,
immediately switch o the tool and disconnect the plug
• If the cord is damaged or cut through while working, do
not touch the cord, but immediately disconnect the plug
• If the drill bit becomes unexpectedly jammed (causing
a sudden, dangerous reaction), immediately switch o
the tool
• Be aware of the forces that occur as a result of jamming
(especially when drilling metals); always use auxiliary
handle and take a secure stance
AFTER USE
• When you put away the tool, switch o the motor and
ensure that all moving parts have come to a complete
standstill
EXPLANATION OF SYMBOLS ON TOOL
3Read the instruction manual before use
4Double insulation (no earth wire required)
5Do not dispose of the tool together with household waste
material
WHEN CONNECTING NEW 3-PIN PLUG (U.K. ONLY):
• Do not connect the blue (= neutral) or brown (= live) wire
in the cord of this tool to the earth terminal of the plug
•If for any reason the old plug is cut o the cord of this tool,
it must be disposed of safely and not left unattended
USE
• On/o 6
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 aect 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 dierent
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) SERVICE
a) Have your power tool serviced by a qualied repair
person using only identical replacement parts. This
will ensure that the safety of the power tool is maintained.
SAFETY INSTRUCTIONS FOR HAMMERS
• Wear ear protectors (exposure to noise can cause
hearing loss)
• Use auxiliary handle(s), if supplied with the tool
(loss of control can cause personal injury)
• Hold the power tool by insulated gripping surfaces,
when performing an operation where the cutting
accessory may contact hidden wiring or its own
cord (cutting accessory contacting a “live” wire may
make exposed metal parts of the power tool “live” and
could give the operator an electric shock)
SAFETY INSTRUCTIONS WHEN USING LONG DRILL
BITS WITH ROTARY HAMMERS
• Always start drilling at low speed and with the bit
tip in contact with the workpiece. At higher speeds,
the bit is likely to bend if allowed to rotate freely without
contacting the workpiece, resulting in personal injury.
• Apply pressure only in direct line with the bit and do
not apply excessive pressure. Bits can bend, causing
breakage or loss of control, resulting in personal injury.
GENERAL
• Always check that the supply voltage is the same as the
voltage indicated on the nameplate of the tool
• This tool should not be used by people under the age of
16 years
• Do not work materials containing asbestos (asbestos
is considered carcinogenic)
• Never use the tool when the cord is damaged; it must be
replaced by a specially prepared cord available through
the service organization.

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• When drilling ferrous metals
-pre-drill a smaller hole, when a large hole is required
-lubricate drill bit occasionally with oil
• When turning in a screw at/near the cross cut end or an
edge of wood, pre-drill a hole in order to avoid cracking
of the wood
• Splinterfree drilling in wood t
• Dustfree drilling in walls y
• Dustfree drilling in ceilings u
• Drilling in tiles without skidding i
• For more information see www.skil.com
MAINTENANCE / SERVICE
• This tool is not intended for professional use
• Never open the tool yourself o
• Always keep tool and cord clean (especially ventilation
slots H 2)
! disconnect the plug before cleaning
• If the tool should fail despite the care taken in
manufacturing and testing procedures, repair should
be carried out by an after-sales service centre for SKIL
power tools
-send the tool undismantled together with proof of
purchase to your dealer or the nearest SKIL service
station (addresses as well as the service diagram of the
tool are listed on www.skil.com)
• Be aware that damage due to overload or improper
handling of the tool will be excluded from the warranty
(for the SKIL warranty conditions see www.skil.com or
ask your dealer)
ENVIRONMENT
Only for EU countries
• Do not dispose of electric tools, accessories and
packaging together with household waste material
-in observance of European Directive 2012/19/EC
on waste of electric and electronic equipment and
its implementation in accordance with national law,
electric tools that have reached the end of their life
must be collected separately and returned to an
environmentally compatible recycling facility
-symbol 5will remind you of this when the need for
disposing occurs
Only for UK
• Do not dispose of electric tools, accessories and
packaging together with household waste material
-in observance of on Waste Electric and Electronic
Equipment Regulations 2013 (SI 2013/3113), electric
tools that have reached the end of their life must be
collected separately and returned to an environmentally
compatible recycling facility
-symbol 5will remind you of this when the need for
disposing occurs
NOISE / VIBRATION
• Measured in accordance with EN 62841 the sound
pressure level of this tool is 94.0 dB(A) and the sound
power level 105.0 dB(A) (uncertainty K = 3 dB), and the
vibration ✱(triax vector sum; uncertainty K = 1.5 m/s²)
✱when hammer drilling in concrete 18.7 m/s²
✱when chiseling 20.3 m/s²
• The vibration emission level has been measured in
• Maximum speed control 7
-With wheel B the maximum speed can be adjusted
from low to high
• Selecting operating mode 8
! select operating mode only when tool is switched
o and plug is disconnected
-press button C to unlock switch D
-rst turn switch D to the desired operating mode until it
snap-locks
-then turn switch E to the desired operating mode
1 = normal drilling/screwdriving
2 = impact drilling
3 = chiseling
! start working only when switch D is locked
-for drilling in wood, metal and plastic the corresponding
adapter should be used (see: Application Advice)
-the hammer mechanism is activated by applying a
slight pressure on the tool when the drill bit is in contact
with the workpiece
-it takes a short time for the hammer mechanism to
reach full impact power
-do not apply too much pressure on the tool; let the tool
do the work for you
• Changing bits 9
! clean and lightly lubricate the SDS+ accessory
before insertion
-pull back locking sleeve F and insert accessory
in SDS+ chuck while turning and pushing it until it
engages; the accessory locks in position automatically
-pull accessory to check that it is locked correctly
-remove accessory by pulling back locking sleeve F
! the SDS+ accessory requires freedom of
movement which causes eccentricity when tool
is o-load; however, the accessory automatically
centres itself during operation without aecting
drilling precision
! do not use bits/chisels with a damaged shank
• Safety clutch
if the accessory gets jammed, the drive to the spindle is
interrupted (causing a rattling noise)
-immediately switch o tool
-remove the jammed accessory
-switch on tool again
• Adjusting drilling depth q
• Holding and guiding the tool w
! while working, always hold the tool at the grey-
coloured grip area(s)
-always use auxiliary handle G (can be adjusted as
illustrated)
-keep ventilation slots H 2uncovered
APPLICATION ADVICE
• Use the appropriate bits e
! only use sharp bits/chisels
• For drilling in wood, metal and plastic use the
corresponding adapter r
-clean and lightly lubricate adapter before insertion
-pull back locking sleeve F 2and insert adapter
in SDS+ chuck while turning and pushing it until it
engages; the adapter locks in position automatically
-pull adapter to check whether is it locked correctly
-set switch D 2to normal drilling (only activate when
tool is switched o and plug is disconnected)

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accordance with a standardised test given in EN 62841;
it may be used to compare one tool with another and as
a preliminary assessment of exposure to vibration when
using the tool for the applications mentioned
-using the tool for dierent applications, or with dierent
or poorly maintained accessories, may signicantly
increase the exposure level
-the times when the tool is switched o or when it is
running but not actually doing the job, may signicantly
reduce the exposure level
! protect yourself against the eects of vibration by
maintaining the tool and its accessories, keeping
your hands warm, and organizing your work
patterns